消息中间件系列五:RabbitMQ的使用场景(异步处理、应用解耦)
一、异步处理
场景:
用户注册,写入数据库成功以后,发送邮件和短信。
准备工作:
1)安装RabbitMQ,参考前面的文章
2)新建一个名为RabbitMQAsyncProc的maven web工程,在pom.xml文件里面引入如下依赖
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.study.demo</groupId>
<artifactId>RabbitMQAsyncProc</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>RabbitMQAsyncProc Maven Webapp</name>
<url>http://maven.apache.org</url>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency> <dependency>
<groupId>javax</groupId>
<artifactId>javaee-web-api</artifactId>
<version>7.0</version>
<scope>provided</scope>
</dependency> <dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>4.3.11.RELEASE</version>
</dependency> <dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency> <!--日志-->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.5</version>
</dependency>
<!-- <dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.16</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>jcl-over-slf4j</artifactId>
<version>1.7.5</version>
</dependency>-->
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>1.0.13</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-core</artifactId>
<version>1.0.13</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-access</artifactId>
<version>1.0.13</version>
</dependency> <!--JSON-->
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.9.13</version>
</dependency>
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-core-asl</artifactId>
<version>1.9.13</version>
</dependency> <!-- RabbitMQ -->
<dependency>
<groupId>com.rabbitmq</groupId>
<artifactId>amqp-client</artifactId>
<version>5.0.0</version>
</dependency>
<dependency>
<groupId>org.springframework.amqp</groupId>
<artifactId>spring-rabbit</artifactId>
<version>2.0.0.RELEASE</version>
</dependency> <!--使用AspectJ方式注解需要相应的包-->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjrt</artifactId>
<version>1.6.12</version>
</dependency>
<!--使用AspectJ方式注解需要相应的包-->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.6.12</version>
</dependency>
</dependencies>
<build>
<finalName>RabbitMQAsyncProc</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>2.6</version>
<configuration>
<failOnMissingWebXml>false</failOnMissingWebXml>
</configuration>
</plugin> </plugins>
<resources>
<resource>
<directory>${basedir}/src/main/java</directory>
<includes>
<include>**/*.xml</include>
</includes>
</resource>
</resources>
</build>
</project>
1. 新建一个用户信息实体
package com.study.demo.vo; import java.util.UUID; /**
*
* @Description: 用户信息实体
* @author liguangsheng
* @date 2018年9月18日
*
*/
public class User { private final String userId;
private final String userName;
private final String email;
private final String phoneNumber; public User(String userId, String userName, String email, String phoneNumber) {
this.userId = userId;
this.userName = userName;
this.email = email;
this.phoneNumber = phoneNumber;
} public String getUserId() {
return userId;
} public String getUserName() {
return userName;
} public String getEmail() {
return email;
} public String getPhoneNumber() {
return phoneNumber;
} public static User makeUser(String userName,String email,String phoneNumber){
String userId = UUID.randomUUID().toString();
return new User(userId,userName,email,phoneNumber);
} @Override
public String toString() {
return "User{" +
"userId='" + userId + '\'' +
", userName='" + userName + '\'' +
", email='" + email + '\'' +
", phoneNumber='" + phoneNumber + '\'' +
'}';
}
}
2. 新建一个用户注册接口
package com.study.demo.service; import com.study.demo.vo.User; /**
*
* @Description: 用户注册接口
* @author leeSmall
* @date 2018年9月18日
*
*/
public interface IUserReg { public boolean userRegister(User user); }
3. 新建三个业务类
1)保存用户数据到数据库
package com.study.demo.service.busi; import java.util.concurrent.ConcurrentHashMap; import org.springframework.stereotype.Service; import com.study.demo.vo.User; /**
*
* @Description: 保存用户数据到数据库
* @author leeSmall
* @date 2018年9月18日
*
*/
@Service
public class SaveUser { private ConcurrentHashMap<String,User> userData =
new ConcurrentHashMap<String, User>(); public void saveUser(User user){
try {
Thread.sleep(50);
} catch (InterruptedException e) {
e.printStackTrace();
}
userData.putIfAbsent(user.getUserId(),user);
} public User getUser(String userId){
return userData.get(userId);
} }
2)发送邮件的服务
package com.study.demo.service.busi; import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service; /**
*
* @Description: 发送邮件的服务
* @author leeSmall
* @date 2018年9月18日
*
*/
@Service
public class SendEmail {
private Logger logger = LoggerFactory.getLogger(SendEmail.class); public void sendEmail(String email){
try {
Thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
logger.info("-------------Already Send email to "+email);
} }
3)发送短信的服务
package com.study.demo.service.busi; import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service; /**
*
* @Description: 发送短信的服务
* @author leeSmall
* @date 2018年9月18日
*
*/
@Service
public class SendSms { private Logger logger = LoggerFactory.getLogger(SendSms.class); public void sendSms(String phoneNumber){
try {
Thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
logger.info("-------------Already Send Sms to "+phoneNumber);
} }
4. 新建/RabbitMQAsyncProc/src/main/java/applicationContext.xml配置文件
<?xml version="1.0" encoding="UTF-8"?>
<!-- 查找最新的schemaLocation 访问 http://www.springframework.org/schema/ -->
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:jee="http://www.springframework.org/schema/jee"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:task="http://www.springframework.org/schema/task"
xmlns:rabbit="http://www.springframework.org/schema/rabbit"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.0.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-4.0.xsd
http://www.springframework.org/schema/rabbit
http://www.springframework.org/schema/rabbit/spring-rabbit-2.0.xsd"> <aop:aspectj-autoproxy /> <!-- 配置扫描路径 -->
<context:component-scan base-package="com.study.demo">
<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
</context:component-scan> <!-- rabbitMQ配置 -->
<bean id="rabbitConnectionFactory"
class="org.springframework.amqp.rabbit.connection.CachingConnectionFactory">
<constructor-arg value="127.0.0.1"/>
<property name="username" value="guest"/>
<property name="password" value="guest"/>
<property name="channelCacheSize" value="8"/>
<property name="port" value="5672"></property>
</bean>
<rabbit:admin connection-factory="rabbitConnectionFactory"/> <!--邮件相关队列-->
<rabbit:queue name="email_queue" durable="false"/>
<!--短信相关队列-->
<rabbit:queue name="sms_queue" durable="false"/> <!--将队列和交换器通过路由键绑定-->
<rabbit:direct-exchange name="user-reg-exchange"
xmlns="http://www.springframework.org/schema/rabbit"
durable="true">
<rabbit:bindings>
<rabbit:binding queue="email_queue" key="email" ></rabbit:binding>
<rabbit:binding queue="sms_queue" key="sms" ></rabbit:binding>
</rabbit:bindings>
</rabbit:direct-exchange> <!-- 创建rabbitTemplate 消息模板类 -->
<bean id="rabbitTemplate" class="org.springframework.amqp.rabbit.core.RabbitTemplate">
<constructor-arg ref="rabbitConnectionFactory"></constructor-arg>
</bean> </beans>
5. 新建一个串行的用户注册实现类
package com.study.demo.service.impl; import com.study.demo.service.IUserReg;
import com.study.demo.service.busi.SaveUser;
import com.study.demo.service.busi.SendEmail;
import com.study.demo.service.busi.SendSms;
import com.study.demo.vo.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Service; /**
*
* @Description: 串行的用户注册
* @author leeSmall
* @date 2018年9月18日
*
*/
@Service
@Qualifier("serial")
public class SerialProcess implements IUserReg { @Autowired
private SaveUser saveUser;
@Autowired
private SendEmail sendEmail;
@Autowired
private SendSms sendSms; public boolean userRegister(User user) {
try {
saveUser.saveUser(user);
sendEmail.sendEmail(user.getEmail());
sendSms.sendSms(user.getPhoneNumber());
return true;
} catch (Exception e) {
return false;
}
}
}
6. 新建一个并行的用户注册实现类
package com.study.demo.service.impl; import java.util.concurrent.Callable;
import java.util.concurrent.FutureTask; import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Service; import com.study.demo.service.IUserReg;
import com.study.demo.service.busi.SaveUser;
import com.study.demo.service.busi.SendEmail;
import com.study.demo.service.busi.SendSms;
import com.study.demo.vo.User; /**
*
* @Description: 并行的用户注册
* @author leeSmall
* @date 2018年9月18日
*
*/
@Service
@Qualifier("para")
public class ParalllerProcess implements IUserReg { private static Logger logger = LoggerFactory.getLogger(ParalllerProcess.class); @Autowired
private SaveUser saveUser;
@Autowired
private SendEmail sendEmail;
@Autowired
private SendSms sendSms; //发送邮件的线程
private static class SendEmailThread implements Callable<Boolean>{ private SendEmail sendEmail;
private String email; public SendEmailThread(SendEmail sendEmail, String email) {
this.sendEmail = sendEmail;
this.email = email;
} public Boolean call() throws Exception {
sendEmail.sendEmail(email);
logger.info("SendEmailThread send mail to"+email);
return true;
}
} //发送短信的线程
private static class SendSmsThread implements Callable<Boolean>{ private SendSms sendSms;
private String phoneNumber; public SendSmsThread(SendSms sendSms, String phoneNumber) {
this.sendSms = sendSms;
this.phoneNumber = phoneNumber;
} public Boolean call() throws Exception {
sendSms.sendSms(phoneNumber);
logger.info("SendSmsThread send mail to"+phoneNumber);
return true;
}
} public boolean userRegister(User user) {
FutureTask<Boolean> sendEmailFuture =
new FutureTask<Boolean>(new SendEmailThread(sendEmail,user.getEmail()));
FutureTask<Boolean> sendSmsFuture =
new FutureTask<Boolean>(new SendSmsThread(sendSms,user.getPhoneNumber()));
try {
saveUser.saveUser(user);
new Thread(sendEmailFuture).start();
new Thread(sendSmsFuture).start();
sendEmailFuture.get();//获取邮件发送的结果
sendSmsFuture.get();//获取短信发送的结果
return true;
} catch (Exception e) {
logger.error(e.toString());
return false;
} }
}
7. 新建一个RabbitMQ实现的异步用户注册
package com.study.demo.service.impl; import com.study.demo.service.IUserReg;
import com.study.demo.service.busi.SaveUser;
import com.study.demo.vo.User;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.amqp.AmqpException;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.core.MessageProperties;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Service; /**
*
* @Description: RabbitMQ实现的异步用户注册
* @author leeSmall
* @date 2018年9月18日
*
*/
@Service
@Qualifier("async")
public class AsyncProcess implements IUserReg{ private Logger logger = LoggerFactory.getLogger(AsyncProcess.class); @Autowired
private RabbitTemplate rabbitTemplate;
@Autowired
private SaveUser saveUser; public boolean userRegister(User user) {
try {
saveUser.saveUser(user);
rabbitTemplate.send("user-reg-exchange","email",
new Message(user.getEmail().getBytes(),new MessageProperties()));
rabbitTemplate.send("user-reg-exchange","sms",
new Message(user.getEmail().getBytes(),new MessageProperties()));
} catch (AmqpException e) {
logger.error(e.toString());
return false;
} return true;
}
}
8.新建一个RabbitMQ消息消费端监听邮件消息类
package com.study.demo.service.mq; import com.study.demo.service.busi.SendEmail;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.core.MessageListener;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component; /**
*
* @Description: RabbitMQ消息消费端监听邮件消息类
* @author leeSmall
* @date 2018年9月18日
*
*/
@Component
public class ProcessUserEmail implements MessageListener { private Logger logger = LoggerFactory.getLogger(ProcessUserEmail.class); @Autowired
private SendEmail sendEmail; public void onMessage(Message message) {
logger.info("accept message,ready process......");
sendEmail.sendEmail(new String(message.getBody())); }
}
在/RabbitMQAsyncProc/src/main/java/applicationContext.xml添加邮件消息监听类配置:
<rabbit:listener-container connection-factory="rabbitConnectionFactory">
<rabbit:listener queues="email_queue" ref="processUserEmail"
method="onMessage"/>
</rabbit:listener-container>
9. 新建一个RabbitMQ消息消费端监听sms消息类
package com.study.demo.service.mq; import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.core.MessageListener;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component; import com.study.demo.service.busi.SendSms; /**
*
* @Description: RabbitMQ消息消费端监听sms消息类
* @author leeSmall
* @date 2018年9月18日
*
*/
@Component
public class ProcessUserSms implements MessageListener { private Logger logger = LoggerFactory.getLogger(ProcessUserSms.class); @Autowired
private SendSms sendSms; public void onMessage(Message message) {
logger.info("accept message,ready process......");
sendSms.sendSms(new String(message.getBody())); }
}
在/RabbitMQAsyncProc/src/main/java/applicationContext.xml添加短信消息监听类配置:
<rabbit:listener-container connection-factory="rabbitConnectionFactory">
<rabbit:listener queues="email_queue" ref="processUserEmail"
method="onMessage"/>
<rabbit:listener queues="sms_queue" ref="processUserSms"
method="onMessage"/>
</rabbit:listener-container>
10. 新建一个统计花费时间工具类
package com.study.demo.tools; import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service; import com.study.demo.vo.User; /**
*
* @Description: 统计花费时间工具类
* @author leeSmall
* @date 2018年9月18日
*
*/
@Aspect
@Service
public class StatTime { private Logger logger = LoggerFactory.getLogger(StatTime.class);
private User user; public StatTime() {
logger.info("************Aop开启");
} @Pointcut("execution(* com.study.demo.service.impl.*.*Register(..))")
public void stat(){} @Around("stat()&&args(user)")
public Object statTime(ProceedingJoinPoint proceedingJoinPoint,User user){
this.user = user;
long start = System.currentTimeMillis();
Object result = null;
try {
result = proceedingJoinPoint.proceed(new Object[]{this.user});
} catch (Throwable throwable) {
throwable.printStackTrace();
}
logger.info("************spend time : "+(System.currentTimeMillis()-start)+"ms");
return result; } }
11. 新建一个用户注册控制器
package com.study.demo.controller; import com.study.demo.service.IUserReg;
import com.study.demo.vo.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody; /**
*
* @Description: 用户注册控制器
* @author leeSmall
* @date 2018年9月18日
*
*/
@Controller
public class UserRegController { private static final String SUCCESS = "suc";
private static final String FAILUER = "failure"; @Autowired
@Qualifier("serial")
private IUserReg userReg; @RequestMapping("/userReg")
public String userReg(){
return "index";
} @RequestMapping("/saveUser")
@ResponseBody
public String saveUser(@RequestParam("userName")String userName,
@RequestParam("email")String email,
@RequestParam("phoneNumber")String phoneNumber){
try {
if (userReg.userRegister(User.makeUser(userName,email,phoneNumber)))
return SUCCESS;
else
return FAILUER;
} catch (Exception e) {
return FAILUER;
}
} }
12. 新建/RabbitMQAsyncProc/src/main/java/spring-mvc.xml配置文件
<?xml version="1.0" encoding="UTF-8"?>
<!-- 查找最新的schemaLocation 访问 http://www.springframework.org/schema/ -->
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-4.0.xsd"> <!-- <mvc:default-servlet-handler />-->
<mvc:resources mapping="/js/**" location="/js/"/>
<mvc:annotation-driven
content-negotiation-manager="contentNegotiationManager" /> <context:component-scan base-package="com.study.demo.controller">
<!-- <context:include-filter type="annotation"
expression="org.springframework.stereotype.Controller" />-->
</context:component-scan> <bean id="stringHttpMessageConverter"
class="org.springframework.http.converter.StringHttpMessageConverter">
<property name="supportedMediaTypes">
<list>
<bean class="org.springframework.http.MediaType">
<constructor-arg index="0" value="text" />
<constructor-arg index="1" value="plain" />
<constructor-arg index="2" value="UTF-8" />
</bean>
</list>
</property>
</bean>
<bean id="mappingJacksonHttpMessageConverter"
class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter" /> <bean
class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters">
<list>
<ref bean="stringHttpMessageConverter" />
<ref bean="mappingJacksonHttpMessageConverter" />
</list>
</property>
</bean> <bean id="contentNegotiationManager"
class="org.springframework.web.accept.ContentNegotiationManagerFactoryBean">
<property name="mediaTypes">
<map>
<entry key="html" value="text/html" />
<entry key="pdf" value="application/pdf" />
<entry key="xsl" value="application/vnd.ms-excel" />
<entry key="xml" value="application/xml" />
<entry key="json" value="application/json" />
</map>
</property>
<property name="defaultContentType" value="text/html" />
</bean> <bean id="viewResolver"
class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
<property name="order" value="0" />
<property name="contentNegotiationManager" ref="contentNegotiationManager" /> <property name="viewResolvers">
<list>
<bean class="org.springframework.web.servlet.view.BeanNameViewResolver" />
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass"
value="org.springframework.web.servlet.view.JstlView" />
<property name="prefix" value="/WEB-INF/views/" />
<property name="suffix" value=".jsp"></property>
</bean>
</list>
</property> <property name="defaultViews">
<list>
<bean
class="org.springframework.web.servlet.view.json.MappingJackson2JsonView">
<property name="extractValueFromSingleKeyModel" value="true" />
</bean>
</list>
</property>
</bean> </beans>
13. 新建一个/RabbitMQAsyncProc/src/main/webapp/WEB-INF/views/index.jsp页面
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
System.out.println(path);
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
System.out.println(basePath);
%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>"> <title>用户注册-异步模式</title> <meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<script type="text/javascript" src="<%--<%=basePath%>--%>resources/js/jquery-1.11.0.min.js"></script>
<style type="text/css">
.h1 {
margin: 0 auto;
} #producer{
width: 48%;
border: 1px solid blue;
height: 80%;
align:center;
margin:0 auto;
} body{
text-align :center;
}
div {
text-align :center;
}
textarea{
width:80%;
height:100px;
border:1px solid gray;
}
button{
background-color: rgb(62, 156, 66);
border: none;
font-weight: bold;
color: white;
height:30px;
}
</style>
<script type="text/javascript"> function send(){
$.ajax({
type: 'get',
url:'<%=basePath%>saveUser?userName='+$("#userName").val()
+'&email='+$("#userEmail").val()+'&phoneNumber='+$("#userNumber").val(),
dataType:'text',
success:function(data){
if(data=="suc"){
alert("注册成功!");
}else{
alert("注册失败!");
}
},
error:function(data){
alert("注册错误!");
} });
}
</script>
</head> <body>
<h1>用户注册-异步模式</h1>
<div id="producer">
用户姓名:<input type="text" id="userName"/>
<br>
用户邮件:<input type="text" id="userEmail"/>
<br>
用户手机:<input type="text" id="userNumber"/>
<br>
<button onclick="send()">注 册</button>
<br>
</div>
</body>
</html>
14. 新建/RabbitMQAsyncProc/src/main/webapp/WEB-INF/web.xml配置文件
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
version="3.0">
<display-name>RabbitMqSpringProducerDemo</display-name> <servlet-mapping>
<servlet-name>default</servlet-name>
<url-pattern>*.js</url-pattern>
</servlet-mapping> <!-- Spring 编码过滤器 start -->
<filter>
<filter-name>characterEncoding</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>characterEncoding</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- Spring 编码过滤器 End --> <!-- Spring Application Context Listener Start -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- Spring Application Context Listener End --> <!-- Spring MVC Config Start -->
<servlet>
<servlet-name>SpringMVC</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring-mvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>SpringMVC</servlet-name>
<!-- Filter all resources -->
<url-pattern>/</url-pattern>
</servlet-mapping>
<!-- Spring MVC Config End --> </web-app>
到此代码别写完成!
15. 在Tomcat v8.5 8080里面启动RabbitMQAsyncProc
首次启动时用户注册接口时串行的
@Autowired
@Qualifier("serial")
private IUserReg userReg;
在浏览器输入地址http://localhost:8080/RabbitMQAsyncProc/userReg访问进行用户注册
查看控制台状态:
修改用户注册接口为并行的:
@Autowired
@Qualifier("para")
private IUserReg userReg;
在用户界面注册 查看控制台状态:
修改用户注册接口为RabbitMQ异步实现的的:
@Autowired
@Qualifier("async")
private IUserReg userReg;
在用户界面注册 查看控制台状态:
总结:
串行模式 ************spend time : 251ms
并行模式 ************spend time : 153ms
消息队列模式:************spend time : 59ms
所以RabbitMQ异步处理的性能最快
二、应用解耦
场景:
用户下订单买商品,订单成功了,去扣减库存,库存必须扣减完成,没有库存,库存低于某个阈值,可以扣减成功,要通知其他系统(如采购系统尽快采购,用户订单系统我们尽快调货)
RPC实现。库存系统失败,订单系统也无法成功,订单系统和库存系统耦合了。所以要缓存消息中间件来解耦。发送一个扣减库存的消息,保证消息必须被库存系统处理。
三个问题要解决:
1)订单系统发给MQ服务器的消息,必须被MO服务器接收到(事物、发送者确认)
2)MQ服务器拿到消息以后,消息被正常处理以前必须保存住(持久化)
3)某个库存服务出现了异常,消息要能够被其他库存系统处理(消费者确认,消息监听类要实现ChannelAwareMessageListener)
订单系统一定要知道库存系统是否处理成功怎么办?
库存系统和订单系统之间建立一个消息通道,库存系统去通知订单系统
准备工作:
1)安装RabbitMQ,参考前面的文章
2)分别新建名为RabbitMQOrder和RabbitMQDepot的两个maven web工程,在pom,xml文件里面引入一些依赖
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.study.demo</groupId>
<artifactId>RabbitMQOrder</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>RabbitMQOrder Maven Webapp</name>
<url>http://maven.apache.org</url>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency> <dependency>
<groupId>javax</groupId>
<artifactId>javaee-web-api</artifactId>
<version>7.0</version>
<scope>provided</scope>
</dependency> <dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>4.3.11.RELEASE</version>
</dependency> <dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency> <!--日志 -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.5</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.16</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>jcl-over-slf4j</artifactId>
<version>1.7.5</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>1.0.13</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-core</artifactId>
<version>1.0.13</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-access</artifactId>
<version>1.0.13</version>
</dependency> <!--JSON -->
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.9.13</version>
</dependency>
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-core-asl</artifactId>
<version>1.9.13</version>
</dependency> <dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.8.2</version>
</dependency> <!-- RabbitMQ -->
<dependency>
<groupId>com.rabbitmq</groupId>
<artifactId>amqp-client</artifactId>
<version>5.0.0</version>
</dependency>
<dependency>
<groupId>org.springframework.amqp</groupId>
<artifactId>spring-rabbit</artifactId>
<version>2.0.0.RELEASE</version>
</dependency> <!--使用AspectJ方式注解需要相应的包 -->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjrt</artifactId>
<version>1.6.12</version>
</dependency>
<!--使用AspectJ方式注解需要相应的包 -->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.6.12</version>
</dependency>
</dependencies>
<build>
<finalName>RabbitMQOrder</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>2.6</version>
<configuration>
<failOnMissingWebXml>false</failOnMissingWebXml>
</configuration>
</plugin> </plugins>
<resources>
<resource>
<directory>${basedir}/src/main/java</directory>
<includes>
<include>**/*.xml</include>
</includes>
</resource>
</resources>
</build>
</project>
编写订单系统RabbitMQOrder代码:
1. 在工程RabbitMQOrder新建一个商品实体
package com.study.demo.vo; import java.io.Serializable; /**
*
* @Description: 商品实体
* @author leeSmall
* @date 2018年9月19日
*
*/
public class GoodTransferVo implements Serializable { private static final long serialVersionUID = 7702481109435751937L; /**
* 商品id
*/
private String goodsId; /**
* 改变的库存量
*/
private int changeAmount; /**
* 入库或者出库
*/
private boolean inOrOut; public String getGoodsId() {
return goodsId;
} public void setGoodsId(String goodsId) {
this.goodsId = goodsId;
} public int getChangeAmount() {
return changeAmount;
} public void setChangeAmount(int changeAmount) {
this.changeAmount = changeAmount;
} public boolean isInOrOut() {
return inOrOut;
} public void setInOrOut(boolean inOrOut) {
this.inOrOut = inOrOut;
}
}
2. 在工程RabbitMQOrder新建一个处理库存接口
package com.study.demo.service; /**
*
* @Description: 处理库存接口
* @author leeSmall
* @date 2018年9月19日
*
*/
public interface IProDepot { public void processDepot(String goodsId,int amount); }
3. 在工程RabbitMQOrder新建一个/RabbitMQOrder/src/main/java/applicationContext.xml配置文件,配置RabbitMQ
<?xml version="1.0" encoding="UTF-8"?>
<!-- 查找最新的schemaLocation 访问 http://www.springframework.org/schema/ -->
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:jee="http://www.springframework.org/schema/jee"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:task="http://www.springframework.org/schema/task"
xmlns:rabbit="http://www.springframework.org/schema/rabbit"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.0.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-4.0.xsd
http://www.springframework.org/schema/rabbit http://www.springframework.org/schema/rabbit/spring-rabbit-2.0.xsd"> <!-- 配置扫描路径 -->
<context:component-scan base-package="com.study.demo">
<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
</context:component-scan> <!-- rabbitMQ配置 -->
<bean id="rabbitConnectionFactory"
class="org.springframework.amqp.rabbit.connection.CachingConnectionFactory">
<constructor-arg value="127.0.0.1"/>
<property name="username" value="guest"/>
<property name="password" value="guest"/>
<property name="channelCacheSize" value="8"/>
<property name="port" value="5672"></property>
</bean>
<rabbit:admin connection-factory="rabbitConnectionFactory"/> <rabbit:queue name="depot_queue" durable="true"/> <!--队列通过路由键和交换器绑定 -->
<rabbit:direct-exchange name="depot-amount-exchange"
xmlns="http://www.springframework.org/schema/rabbit" durable="true">
<rabbit:bindings>
<rabbit:binding queue="depot_queue" key="amount.depot" ></rabbit:binding>
</rabbit:bindings>
</rabbit:direct-exchange> <!-- 创建rabbitTemplate 消息模板类 -->
<bean id="rabbitTemplate" class="org.springframework.amqp.rabbit.core.RabbitTemplate">
<constructor-arg ref="rabbitConnectionFactory"></constructor-arg>
</bean> </beans>
4. 在工程RabbitMQOrder新建一个RabbitMQ处理库存接口的实现类
package com.study.demo.service; import com.study.demo.vo.GoodTransferVo;
import com.google.gson.Gson;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.core.MessageDeliveryMode;
import org.springframework.amqp.core.MessageProperties;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Service; /**
*
* @Description: RabbitMQ处理库存接口的实现类
* @author leeSmall
* @date 2018年9月19日
*
*/
@Service
@Qualifier("mq")
public class MqMode implements IProDepot { private final static String DEPOT_RK = "amount.depot";
private final static String DEPOT_EXCHANGE = "depot-amount-exchange"; @Autowired
RabbitTemplate rabbitTemplate; private static Gson gson = new Gson(); public void processDepot(String goodsId, int amount) {
GoodTransferVo goodTransferVo = new GoodTransferVo();
goodTransferVo.setGoodsId(goodsId);
goodTransferVo.setChangeAmount(amount);
goodTransferVo.setInOrOut(false);
String goods = gson.toJson(goodTransferVo);
MessageProperties messageProperties = new MessageProperties();
messageProperties.setDeliveryMode(MessageDeliveryMode.PERSISTENT);
rabbitTemplate.send(DEPOT_EXCHANGE, DEPOT_RK,
new Message(goods.getBytes(), messageProperties));
}
}
5. 在工程RabbitMQOrder新建一个处理订单业务类
package com.study.demo.service; import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Service; /**
*
* @Description: 处理订单业务类
* @author leeSmall
* @date 2018年9月19日
*
*/
@Service
public class ProcessOrder {
private Logger logger = LoggerFactory.getLogger(ProcessOrder.class); @Autowired
@Qualifier("mq")
private IProDepot proDepot; public void processOrder(String goodsId,int amount){
try {
Thread.sleep(80);
} catch (InterruptedException e) {
e.printStackTrace();
}
logger.info("--------------------["+goodsId+"]订单入库完成,准备变动库存!");
proDepot.processDepot(goodsId,amount); } }
6. 在工程RabbitMQOrder新建一个RabbitMQ发送者确认
package com.study.demo.service.callback; import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.amqp.rabbit.support.CorrelationData;
import org.springframework.stereotype.Service; /**
*
* @Description: RabbitMQ发送者确认
* @author leeSmall
* @date 2018年9月19日
*
*/
@Service
public class ConfirmCallback implements RabbitTemplate.ConfirmCallback {
private Logger logger = LoggerFactory.getLogger(ConfirmCallback.class); public void confirm(CorrelationData correlationData, boolean ack, String cause) {
if (ack) {
logger.info("消息确认发送给mq成功");
} else {
//处理失败的消息
logger.info("消息发送给mq失败,考虑重发:"+cause);
}
}
}
7. 在工程RabbitMQOrder新建一个RabbitMQ返回确认
package com.study.demo.service.callback; import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.stereotype.Service; /**
*
* @Description: RabbitMQ返回确认-RabbitMQ服务内部出错时回调
* @author leeSmall
* @date 2018年9月19日
*
*/
@Service
public class SendReturnCallback implements RabbitTemplate.ReturnCallback { private Logger logger = LoggerFactory.getLogger(SendReturnCallback.class); public void returnedMessage(Message message, int replyCode,
String replyText, String exchange,
String routingKey) {
logger.info("Returned replyText:"+replyText);
logger.info("Returned exchange:"+exchange);
logger.info("Returned routingKey:"+routingKey);
String msgJson = new String(message.getBody());
logger.info("Returned Message:"+msgJson);
}
}
8. 在/RabbitMQOrder/src/main/java/applicationContext.xml配置文件新增RabbitMQ发送者确认和RabbitMQ返回确认配置
<?xml version="1.0" encoding="UTF-8"?>
<!-- 查找最新的schemaLocation 访问 http://www.springframework.org/schema/ -->
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:jee="http://www.springframework.org/schema/jee"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:task="http://www.springframework.org/schema/task"
xmlns:rabbit="http://www.springframework.org/schema/rabbit"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.0.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-4.0.xsd
http://www.springframework.org/schema/rabbit http://www.springframework.org/schema/rabbit/spring-rabbit-2.0.xsd"> <!-- 配置扫描路径 -->
<context:component-scan base-package="com.study.demo">
<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
</context:component-scan> <!-- rabbitMQ配置 -->
<bean id="rabbitConnectionFactory"
class="org.springframework.amqp.rabbit.connection.CachingConnectionFactory">
<constructor-arg value="127.0.0.1"/>
<property name="username" value="guest"/>
<property name="password" value="guest"/>
<property name="channelCacheSize" value="8"/>
<property name="port" value="5672"></property>
<!-- 发布确认必须配置在CachingConnectionFactory上 -->
<property name="publisherConfirms" value="true"/>
</bean>
<rabbit:admin connection-factory="rabbitConnectionFactory"/> <rabbit:queue name="depot_queue" durable="true"/> <!--队列通过路由键和交换器绑定 -->
<rabbit:direct-exchange name="depot-amount-exchange"
xmlns="http://www.springframework.org/schema/rabbit" durable="true">
<rabbit:bindings>
<rabbit:binding queue="depot_queue" key="amount.depot" ></rabbit:binding>
</rabbit:bindings>
</rabbit:direct-exchange> <!-- 创建rabbitTemplate 消息模板类 -->
<bean id="rabbitTemplate" class="org.springframework.amqp.rabbit.core.RabbitTemplate">
<constructor-arg ref="rabbitConnectionFactory"></constructor-arg>
<!--消息确认回调 -->
<property name="confirmCallback" ref="confirmCallback"/>
<property name="returnCallback" ref="sendReturnCallback"/>
</bean> </beans>
9. 在工程RabbitMQOrder新建一个订单业务控制器
package com.study.demo.controller; import com.study.demo.service.ProcessOrder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody; /**
*
* @Description: 订单业务控制器
* @author leeSmall
* @date 2018年9月19日
*
*/
@Controller
public class OrderController { private Logger logger = LoggerFactory.getLogger(OrderController.class);
private static final String SUCCESS = "suc";
private static final String FAILUER = "failure"; @Autowired
private ProcessOrder processOrder; @RequestMapping("/order")
public String order(){
return "index";
} @RequestMapping("/confirmOrder")
@ResponseBody
public String confirmOrder(@RequestParam("goodsId")String goodsId,
@RequestParam("amount")int amount){
try {
processOrder.processOrder(goodsId,amount);
return SUCCESS;
} catch (Exception e) {
logger.error("订单确认异常!",e);
return FAILUER;
}
} }
10. 新增/RabbitMQOrder/src/main/java/spring-mvc.xml配置文件
<?xml version="1.0" encoding="UTF-8"?>
<!-- 查找最新的schemaLocation 访问 http://www.springframework.org/schema/ -->
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-4.0.xsd"> <!-- <mvc:default-servlet-handler />-->
<mvc:resources mapping="/js/**" location="/js/"/>
<mvc:annotation-driven
content-negotiation-manager="contentNegotiationManager" /> <context:component-scan base-package="com.study.demo.controller">
<!-- <context:include-filter type="annotation"
expression="org.springframework.stereotype.Controller" />-->
</context:component-scan> <bean id="stringHttpMessageConverter"
class="org.springframework.http.converter.StringHttpMessageConverter">
<property name="supportedMediaTypes">
<list>
<bean class="org.springframework.http.MediaType">
<constructor-arg index="0" value="text" />
<constructor-arg index="1" value="plain" />
<constructor-arg index="2" value="UTF-8" />
</bean>
</list>
</property>
</bean>
<bean id="mappingJacksonHttpMessageConverter"
class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter" /> <bean
class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters">
<list>
<ref bean="stringHttpMessageConverter" />
<ref bean="mappingJacksonHttpMessageConverter" />
</list>
</property>
</bean> <bean id="contentNegotiationManager"
class="org.springframework.web.accept.ContentNegotiationManagerFactoryBean">
<property name="mediaTypes">
<map>
<entry key="html" value="text/html" />
<entry key="pdf" value="application/pdf" />
<entry key="xsl" value="application/vnd.ms-excel" />
<entry key="xml" value="application/xml" />
<entry key="json" value="application/json" />
</map>
</property>
<property name="defaultContentType" value="text/html" />
</bean> <bean id="viewResolver"
class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
<property name="order" value="0" />
<property name="contentNegotiationManager" ref="contentNegotiationManager" /> <property name="viewResolvers">
<list>
<bean class="org.springframework.web.servlet.view.BeanNameViewResolver" />
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass"
value="org.springframework.web.servlet.view.JstlView" />
<property name="prefix" value="/WEB-INF/views/" />
<property name="suffix" value=".jsp"></property>
</bean>
</list>
</property> <property name="defaultViews">
<list>
<bean
class="org.springframework.web.servlet.view.json.MappingJackson2JsonView">
<property name="extractValueFromSingleKeyModel" value="true" />
</bean>
</list>
</property>
</bean> </beans>
11. 新增/RabbitMQOrder/src/main/webapp/WEB-INF/views/index.jsp页面模拟下订单
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
System.out.println(path);
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
System.out.println(basePath);
%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>"> <title>订单提交</title> <meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<script type="text/javascript" src="<%--<%=basePath%>--%>resources/js/jquery-1.11.0.min.js"></script>
<style type="text/css">
.h1 {
margin: 0 auto;
} #producer{
width: 48%;
border: 1px solid blue;
height: 80%;
align:center;
margin:0 auto;
} body{
text-align :center;
}
div {
text-align :center;
}
textarea{
width:80%;
height:100px;
border:1px solid gray;
}
button{
background-color: rgb(62, 156, 66);
border: none;
font-weight: bold;
color: white;
height:30px;
}
</style>
<script type="text/javascript"> function send(){
$.ajax({
type: 'get',
url:'<%=basePath%>confirmOrder?goodsId='+$("#goods").val()
+'&amount='+$("#amount").val(),
dataType:'text',
success:function(data){
if(data=="suc"){
alert("提交成功!");
}else{
alert("提交失败!");
}
},
error:function(data){
alert("提交错误!");
} });
}
</script>
</head> <body>
<h1>确认提交订单</h1>
<div id="producer">
商品编号:<input type="text" id="goods"/>
<br>
订单数量:<input type="text" id="amount"/>
<br>
<button onclick="send()">确 认</button>
<br>
</div>
</body>
</html>
12.新增 /RabbitMQOrder/src/main/webapp/WEB-INF/web.xml配置文件
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
version="3.0">
<display-name>RabbitMQOrder</display-name> <servlet-mapping>
<servlet-name>default</servlet-name>
<url-pattern>*.js</url-pattern>
</servlet-mapping> <!-- Spring 编码过滤器 start -->
<filter>
<filter-name>characterEncoding</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>characterEncoding</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- Spring 编码过滤器 End --> <!-- Spring Application Context Listener Start -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- Spring Application Context Listener End --> <!-- Spring MVC Config Start -->
<servlet>
<servlet-name>SpringMVC</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring-mvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>SpringMVC</servlet-name>
<!-- Filter all resources -->
<url-pattern>/</url-pattern>
</servlet-mapping>
<!-- Spring MVC Config End --> </web-app>
到此订单系统代码编写完成!
13. 在Tomcat v8.5 8080里面启动RabbitMQOrder,输入地址http://localhost:8080/RabbitMQOrder/order访问
编写库存系统RabbitMQDepot代码:
1. 在工程RabbitMQDepot 新建一个商品实体
package com.study.demo.vo; import java.io.Serializable; /**
*
* @Description: 商品实体
* @author leeSmall
* @date 2018年9月19日
*
*/
public class GoodTransferVo implements Serializable { private static final long serialVersionUID = 7702481109435751937L; /**
* 商品id
*/
private String goodsId; /**
* 改变的库存量
*/
private int changeAmount; /**
* 入库或者出库
*/
private boolean inOrOut; public String getGoodsId() {
return goodsId;
} public void setGoodsId(String goodsId) {
this.goodsId = goodsId;
} public int getChangeAmount() {
return changeAmount;
} public void setChangeAmount(int changeAmount) {
this.changeAmount = changeAmount;
} public boolean isInOrOut() {
return inOrOut;
} public void setInOrOut(boolean inOrOut) {
this.inOrOut = inOrOut;
}
}
2. 在工程RabbitMQDepot 新建一个库存数据服务
package com.study.demo.service; import java.util.concurrent.ConcurrentHashMap;
import java.util.function.BiFunction; import javax.annotation.PostConstruct; import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service; /**
*
* @Description: 库存数据服务
* @author leeSmall
* @date 2018年9月19日
*
*/
@Service
public class Depot { private static Logger logger = LoggerFactory.getLogger(Depot.class); private ConcurrentHashMap<String,Integer> goodsData =
new ConcurrentHashMap<String, Integer>(); @PostConstruct
public void initDepot(){
goodsData.put("001",1000);
goodsData.put("002",500);
goodsData.put("003",600);
goodsData.put("004",700);
} //增加库存
public void inDepot(String goodsId,int addAmout){
logger.info("+++++++++++++++++增加商品:"+goodsId+"库存,数量为:"+addAmout);
int newValue = goodsData.compute(goodsId, new BiFunction<String, Integer, Integer>() {
public Integer apply(String s, Integer integer) {
return integer == null ? addAmout : integer + addAmout;
}
});
logger.info("+++++++++++++++++商品:"+goodsId+"库存,数量变为:"+newValue);
} //减少库存
public void outDepot(String goodsId,int reduceAmout){
logger.info("-------------------减少商品:"+goodsId+"库存,数量为:"+reduceAmout);
int newValue = goodsData.compute(goodsId, new BiFunction<String, Integer, Integer>() {
public Integer apply(String s, Integer integer) {
return integer == null ? 0 : integer - reduceAmout;
}
});
logger.info("-------------------商品:"+goodsId+"库存,数量变为:"+newValue);
} public int getGoodsAmount(String goodsId){
return goodsData.get(goodsId);
}
}
3. 在工程RabbitMQDepot 新建一个库存服务管理
package com.study.demo.service; import com.study.demo.vo.GoodTransferVo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service; /**
*
* @Description: 库存服务管理
* @author leeSmall
* @date 2018年9月19日
*
*/
@Service
public class DepotManager { @Autowired
private Depot depot; public void operDepot(GoodTransferVo goodTransferVo){
if(goodTransferVo.isInOrOut()){
depot.inDepot(goodTransferVo.getGoodsId(),goodTransferVo.getChangeAmount());
}else{
depot.outDepot(goodTransferVo.getGoodsId(),goodTransferVo.getChangeAmount());
}
} }
4. 新建/RabbitMQDepot/src/main/java/applicationContext.xml配置文件,配置RabbitMQ
<?xml version="1.0" encoding="UTF-8"?>
<!-- 查找最新的schemaLocation 访问 http://www.springframework.org/schema/ -->
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:jee="http://www.springframework.org/schema/jee"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:task="http://www.springframework.org/schema/task"
xmlns:rabbit="http://www.springframework.org/schema/rabbit"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.0.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-4.0.xsd
http://www.springframework.org/schema/rabbit http://www.springframework.org/schema/rabbit/spring-rabbit-2.0.xsd"> <!-- 配置扫描路径 -->
<context:component-scan base-package="com.study.demo">
<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
</context:component-scan> <!-- rabbitMQ配置 -->
<bean id="rabbitConnectionFactory"
class="org.springframework.amqp.rabbit.connection.CachingConnectionFactory">
<constructor-arg value="127.0.0.1"/>
<property name="username" value="guest"/>
<property name="password" value="guest"/>
<property name="channelCacheSize" value="8"/>
<property name="port" value="5672"></property>
</bean>
<rabbit:admin connection-factory="rabbitConnectionFactory"/> <!--配置队列 -->
<rabbit:queue name="depot_queue" durable="true"/> <!--队列和交换器绑定 -->
<rabbit:direct-exchange name="depot-amount-exchange"
xmlns="http://www.springframework.org/schema/rabbit" durable="true">
<rabbit:bindings>
<rabbit:binding queue="depot_queue" key="amount.depot" ></rabbit:binding>
</rabbit:bindings>
</rabbit:direct-exchange> <!-- 对消息要手动确认 -->
<rabbit:listener-container connection-factory="rabbitConnectionFactory"
acknowledge="manual"> </rabbit:listener-container> </beans>
5. 在工程RabbitMQDepot 新建一个消息机制处理库存类
package com.study.demo.mq; import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.core.ChannelAwareMessageListener;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service; import com.google.gson.Gson;
import com.rabbitmq.client.Channel;
import com.study.demo.service.DepotManager;
import com.study.demo.vo.GoodTransferVo; /**
*
* @Description: 消息机制处理库存
* @author leeSmall
* @date 2018年9月19日
*
*/
@Service
public class ProcessDepot implements ChannelAwareMessageListener { private static Logger logger = LoggerFactory.getLogger(ProcessDepot.class); @Autowired
private DepotManager depotManager; private static Gson gson = new Gson(); @Override
public void onMessage(Message message, Channel channel) throws Exception {
try {
String msg = new String(message.getBody());
logger.info(">>>>>>>>>>>>>>接收到消息:"+msg);
GoodTransferVo goodTransferVo = gson.fromJson(msg,GoodTransferVo.class);
try {
depotManager.operDepot(goodTransferVo);
channel.basicAck(message.getMessageProperties().getDeliveryTag(),
false);
logger.info(">>>>>>>>>>>>>>库存处理完成,应答Mq服务");
} catch (Exception e) {
logger.error(e.getMessage());
channel.basicNack(message.getMessageProperties().getDeliveryTag(),
false,true);
logger.info(">>>>>>>>>>>>>>库存处理失败,拒绝消息,要求Mq重新派发");
throw e;
} } catch (Exception e) {
logger.error(e.getMessage());
}
} }
6. 在/RabbitMQDepot/src/main/java/applicationContext.xml配置消息机制处理库存
<?xml version="1.0" encoding="UTF-8"?>
<!-- 查找最新的schemaLocation 访问 http://www.springframework.org/schema/ -->
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:jee="http://www.springframework.org/schema/jee"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:task="http://www.springframework.org/schema/task"
xmlns:rabbit="http://www.springframework.org/schema/rabbit"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.0.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-4.0.xsd
http://www.springframework.org/schema/rabbit http://www.springframework.org/schema/rabbit/spring-rabbit-2.0.xsd"> <!-- 配置扫描路径 -->
<context:component-scan base-package="com.study.demo">
<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
</context:component-scan> <!-- rabbitMQ配置 -->
<bean id="rabbitConnectionFactory"
class="org.springframework.amqp.rabbit.connection.CachingConnectionFactory">
<constructor-arg value="127.0.0.1"/>
<property name="username" value="guest"/>
<property name="password" value="guest"/>
<property name="channelCacheSize" value="8"/>
<property name="port" value="5672"></property>
</bean>
<rabbit:admin connection-factory="rabbitConnectionFactory"/> <!--配置队列 -->
<rabbit:queue name="depot_queue" durable="true"/> <!--队列和交换器绑定 -->
<rabbit:direct-exchange name="depot-amount-exchange"
xmlns="http://www.springframework.org/schema/rabbit" durable="true">
<rabbit:bindings>
<rabbit:binding queue="depot_queue" key="amount.depot" ></rabbit:binding>
</rabbit:bindings>
</rabbit:direct-exchange> <!-- 对消息要手动确认 -->
<rabbit:listener-container connection-factory="rabbitConnectionFactory"
acknowledge="manual">
<rabbit:listener queues="depot_queue" ref="processDepot"
method="onMessage" />
</rabbit:listener-container> </beans>
7. 新增/RabbitMQDepot/src/main/java/spring-mvc.xml配置文件
<?xml version="1.0" encoding="UTF-8"?>
<!-- 查找最新的schemaLocation 访问 http://www.springframework.org/schema/ -->
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-4.0.xsd"> <!-- <mvc:default-servlet-handler />-->
<mvc:resources mapping="/js/**" location="/js/"/>
<mvc:annotation-driven
content-negotiation-manager="contentNegotiationManager" /> <context:component-scan base-package="com.study.demo.controller">
<!-- <context:include-filter type="annotation"
expression="org.springframework.stereotype.Controller" />-->
</context:component-scan> <bean id="stringHttpMessageConverter"
class="org.springframework.http.converter.StringHttpMessageConverter">
<property name="supportedMediaTypes">
<list>
<bean class="org.springframework.http.MediaType">
<constructor-arg index="0" value="text" />
<constructor-arg index="1" value="plain" />
<constructor-arg index="2" value="UTF-8" />
</bean>
</list>
</property>
</bean>
<bean id="mappingJacksonHttpMessageConverter"
class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter" /> <bean
class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters">
<list>
<ref bean="stringHttpMessageConverter" />
<ref bean="mappingJacksonHttpMessageConverter" />
</list>
</property>
</bean> <bean id="contentNegotiationManager"
class="org.springframework.web.accept.ContentNegotiationManagerFactoryBean">
<property name="mediaTypes">
<map>
<entry key="html" value="text/html" />
<entry key="pdf" value="application/pdf" />
<entry key="xsl" value="application/vnd.ms-excel" />
<entry key="xml" value="application/xml" />
<entry key="json" value="application/json" />
</map>
</property>
<property name="defaultContentType" value="text/html" />
</bean> <bean id="viewResolver"
class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
<property name="order" value="0" />
<property name="contentNegotiationManager" ref="contentNegotiationManager" /> <property name="viewResolvers">
<list>
<bean class="org.springframework.web.servlet.view.BeanNameViewResolver" />
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass"
value="org.springframework.web.servlet.view.JstlView" />
<property name="prefix" value="/WEB-INF/views/" />
<property name="suffix" value=".jsp"></property>
</bean>
</list>
</property> <property name="defaultViews">
<list>
<bean
class="org.springframework.web.servlet.view.json.MappingJackson2JsonView">
<property name="extractValueFromSingleKeyModel" value="true" />
</bean>
</list>
</property>
</bean> </beans>
8. 新增/RabbitMQDepot/src/main/webapp/WEB-INF/web.xml配置文件
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
version="3.0">
<display-name>RabbitMQDepot</display-name> <servlet-mapping>
<servlet-name>default</servlet-name>
<url-pattern>*.js</url-pattern>
</servlet-mapping> <!-- Spring 编码过滤器 start -->
<filter>
<filter-name>characterEncoding</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>characterEncoding</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- Spring 编码过滤器 End --> <!-- Spring Application Context Listener Start -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- Spring Application Context Listener End --> <!-- Spring MVC Config Start -->
<servlet>
<servlet-name>SpringMVC</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring-mvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>SpringMVC</servlet-name>
<!-- Filter all resources -->
<url-pattern>/</url-pattern>
</servlet-mapping>
<!-- Spring MVC Config End --> </web-app>
到此库存系统代码编写完成!
9. 在Tomcat v8.5 8081启动RabbitMQDepot
10. 在下订单页面模拟下订单,查看控制台状态
库存系统状态:
订单系统状态:
消息中间件系列五:RabbitMQ的使用场景(异步处理、应用解耦)的更多相关文章
- 消息中间件系列三:使用RabbitMq原生Java客户端进行消息通信(消费者(接收方)自动确认模式、消费者(接收方)自行确认模式、生产者(发送方)确认模式)
准备工作: 1)安装RabbitMQ,参考文章:消息中间件系列二:RabbitMQ入门(基本概念.RabbitMQ的安装和运行) 2.)分别新建名为OriginalRabbitMQProducer和O ...
- RabbitMQ,Apache的ActiveMQ,阿里RocketMQ,Kafka,ZeroMQ,MetaMQ,Redis也可实现消息队列,RabbitMQ的应用场景以及基本原理介绍,RabbitMQ基础知识详解,RabbitMQ布曙
消息队列及常见消息队列介绍 2017-10-10 09:35操作系统/客户端/人脸识别 一.消息队列(MQ)概述 消息队列(Message Queue),是分布式系统中重要的组件,其通用的使用场景可以 ...
- RabbitMQ的应用场景
进入正题. 一.异步处理 场景:发送手机验证码,邮件 传统古老处理方式如下图 这个流程,全部在主线程完成,注册->入库->发送邮件->发送短信,由于都在主线程,所以要等待每一步完成才 ...
- 【SpringBoot MQ 系列】RabbitMq 核心知识点小结
[MQ 系列]RabbitMq 核心知识点小结 以下内容,部分取材于官方教程,部分来源网络博主的分享,如有兴趣了解更多详细的知识点,可以在本文最后的文章列表中获取原地址 RabbitMQ 是一个基于 ...
- RabbitMq应用一的补充(RabbitMQ的应用场景)
直接进入正题. 一.异步处理 场景:发送手机验证码,邮件 传统古老处理方式如下图 这个流程,全部在主线程完成,注册->入库->发送邮件->发送短信,由于都在主线程,所以要等待每一步完 ...
- Javascript数组系列五之增删改和强大的 splice()
今天是我们介绍数组系列文章的第五篇,也是我们数组系列的最后一篇文章,只是数据系列的结束,所以大家不用担心,我们会持续的更新干货文章. 生命不息,更新不止! 今天我们就不那么多废话了,直接干货开始. 我 ...
- [时序图笔记] 步步为营UML建模系列五、时序图(Squence diagram)【转】
概述 顺序图是一种详细表示对象之间以及对象与参与者实例之间交互的图,它由一组协作的对象(或参与者实例)以及它们之间可发送的消息组成,它强调消息之间的顺序. 顺序图是一种详细表示对象之间以及对象与系统外 ...
- WCF开发实战系列五:创建WCF客户端程序
WCF开发实战系列五:创建WCF客户端程序 (原创:灰灰虫的家http://hi.baidu.com/grayworm) 在前面的三篇文章中我们分别介绍了WCF服务的三种载体:IIS.Self-Hos ...
- RabbitMQ的使用场景
RabbitMQ的使用场景 1 大数据日志收集消息中间件应用场景 2 消息中间件在搜索系统DIH(伪实时)中的应用 伪实时的搜索系统: 后台系统:(作为生产者发送消息) ...
随机推荐
- js点击回到顶部2
<!DOCTYPE html><html> <head> <meta charset="UTF-8"> <title>点 ...
- C++程序设计方法3:函数重写
派生类对象包含从基类继承类的数据成员,他们构成了“基类子对象”基类中的私有成员,不允许在派生类成员函数中被访问,也不允许派生类的对象访问他们:真正体现基类私有,对派生类也不开放其权限:基类中的公有成员 ...
- PAT基础6-2
6-2 多项式求值 (15 分) 本题要求实现一个函数,计算阶数为n,系数为a[0] ... a[n]的多项式f(x)=∑i=0n(a[i]×xi) 在x点的值. 函数接口定义: dou ...
- 小甲鱼Python第十讲课后题---
0. 下边的列表分片操作会打印什么内容? >>> list1 = [1, 3, 2, 9, 7, 8]>>> list1[2:5] [2,9,7] 1.请问 lis ...
- ES6_入门(5)_解构赋值
学习参考:http://es6.ruanyifeng.com/#docs/destructuring //2017/7/20 /*对象的解构赋值*/ //对象的解构赋值,当变量名的对象的属性名相同时, ...
- Java 读取 txt 文件内容到容器 List
方法一: 一.桌面上准备 DataObject.txt 文件,内容为: 二.打开 Eclipse,编写代码如下: import java.io.BufferedReader; import java. ...
- 3、css初识
前端内容就分三部分html.css.javascript(js),对一个网页来说html相当于是一个裸体的人,css相当于给这个人穿上了衣服,javascript相当于给这个人赋予动作行为,今天我们要 ...
- pin-a-binary-instrumentation-tool
https://software.intel.com/en-us/articles/pin-a-binary-instrumentation-tool-downloads Introduction t ...
- WordPress主题开发:按分类调用文章
调用catid为2的分类下的文章,就是后台分类链接的tag_ID <?php $cat_query = new WP_Query(array( 'cat' => '2' )); ?> ...
- virltualbox 升级之后 苹果虚拟机报The installed support driver doesn't match the version of the user解决方案
1.反安装virtualbox后,不要重启 2.删除virtualbox的安装目录 3.进入%userprofile% 目录 (比如: C:\users\me) 删除 .VirtualBox Virt ...