1：Dubbo是什么

阿里生产的一种rpc 实现框架 

Dubbo 是一个分布式服务框架，是阿里巴巴开源项目 ，被国内电商及互联网项目中使用。

Dubbo 致力于提供高性能和透明化的RPC远程服务调用方案，以及SOA服务治理方案。简单的说，Dubbo就是个服务框架，如果没有分布式的需求，其实是不需要用的，只有在分布式的时候，才有Dubbo这样的分布式服务框架的需求，并且本质上是个服务调用的东东，说白了就是个远程服务调用的分布式框架。

2：Dubbo作用

跨项目之间调用方法

3：Dubbo的使用

1 service实现类上写@Service注解 注意的是这个注解是dubbo的

​ 2 controller 注入的使用@Refrence 进行注入 注意的是这个注解是dubbo的

​ 3 假如service 和controller 之间传递实体类 那么这个实体类必须 实现序列化接口

项目架构

dubbo_service下的pom.xml依赖

<?xml version="1.0" encoding="UTF-8"?>

<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/xsd/maven-4.0.0.xsd">

  <modelVersion>4.0.0</modelVersion>

  <groupId>cn.wangju</groupId>

  <artifactId>dubbo_service</artifactId>

  <version>1.0-SNAPSHOT</version>

  <packaging>war</packaging>

  <name>dubbo_service Maven Webapp</name>

  <properties>

    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

    <maven.compiler.source>1.7</maven.compiler.source>

    <maven.compiler.target>1.7</maven.compiler.target>

    <spring.version>4.2.4.RELEASE</spring.version>

  </properties>

  <dependencies>

    <dependency>

      <groupId>junit</groupId>

      <artifactId>junit</artifactId>

      <version>4.11</version>

      <scope>test</scope>

    </dependency>

    <!-- Spring -->

    <dependency>

      <groupId>org.springframework</groupId>

      <artifactId>spring-context</artifactId>

      <version>${spring.version}</version>

    </dependency>

    <dependency>

      <groupId>org.springframework</groupId>

      <artifactId>spring-beans</artifactId>

      <version>${spring.version}</version>

    </dependency>

    <dependency>

      <groupId>org.springframework</groupId>

      <artifactId>spring-webmvc</artifactId>

      <version>${spring.version}</version>

    </dependency>

    <dependency>

      <groupId>org.springframework</groupId>

      <artifactId>spring-jdbc</artifactId>

      <version>${spring.version}</version>

    </dependency>

    <dependency>

      <groupId>org.springframework</groupId>

      <artifactId>spring-aspects</artifactId>

      <version>${spring.version}</version>

    </dependency>

    <dependency>

      <groupId>org.springframework</groupId>

      <artifactId>spring-jms</artifactId>

      <version>${spring.version}</version>

    </dependency>

    <dependency>

      <groupId>org.springframework</groupId>

      <artifactId>spring-context-support</artifactId>

      <version>${spring.version}</version>

    </dependency>

    <!-- dubbo相关 -->

    <dependency>

      <groupId>com.alibaba</groupId>

      <artifactId>dubbo</artifactId>

      <version>2.8.4</version>

    </dependency>

    <dependency>

      <groupId>org.apache.zookeeper</groupId>

      <artifactId>zookeeper</artifactId>

      <version>3.4.6</version>

    </dependency>

    <dependency>

      <groupId>com.github.sgroschupf</groupId>

      <artifactId>zkclient</artifactId>

      <version>0.1</version>

    </dependency>

    <dependency>

      <groupId>javassist</groupId>

      <artifactId>javassist</artifactId>

      <version>3.11.0.GA</version>

    </dependency>

  </dependencies>

  <build>

    <finalName>dubbo_service</finalName>

    <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->

      <plugins>

        <plugin>

          <artifactId>maven-clean-plugin</artifactId>

          <version>3.1.0</version>

        </plugin>

        <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->

        <plugin>

          <artifactId>maven-resources-plugin</artifactId>

          <version>3.0.2</version>

        </plugin>

        <plugin>

          <artifactId>maven-compiler-plugin</artifactId>

          <version>3.8.0</version>

        </plugin>

        <plugin>

          <artifactId>maven-surefire-plugin</artifactId>

          <version>2.22.1</version>

        </plugin>

        <plugin>

          <artifactId>maven-war-plugin</artifactId>

          <version>3.2.2</version>

        </plugin>

        <plugin>

          <artifactId>maven-install-plugin</artifactId>

          <version>2.5.2</version>

        </plugin>

        <plugin>

          <artifactId>maven-deploy-plugin</artifactId>

          <version>2.8.2</version>

        </plugin>

      </plugins>

    </pluginManagement>

    <plugins>

      <!-- tomcat插件 -->

      <plugin>

        <groupId>org.apache.tomcat.maven</groupId>

        <artifactId>tomcat7-maven-plugin</artifactId>

        <version>2.2</version>

        <configuration>

          <port>1088</port>

          <path>/SSM</path>

          <httpPort>8007</httpPort>

          <uriEncoding>UTF-8</uriEncoding>

          <server>tomcat7</server>

        </configuration>

      </plugin>

    </plugins>

  </build>

</project>

dubbo_service下的配置文件applicationContext_service.xml

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"

       xmlns:context="http://www.springframework.org/schema/context"

       xmlns:dubbo="http://code.alibabatech.com/schema/dubbo" xmlns:mvc="http://www.springframework.org/schema/mvc"

       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd

        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd

        http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd

        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

    <dubbo:application name="dubbodemo-service"/>

    <!--配置连接的端口号-->

    <dubbo:registry address="zookeeper://192.168.200.128:2181"/>

    <dubbo:annotation package="cn.wangju.service" />

</beans>

dubbo_service下的web.xml文件

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

         xmlns="http://java.sun.com/xml/ns/javaee"

         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"

         version="2.5">

  <!-- 加载spring容器 -->

  <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>

</web-app>

dubbo_service下的service接口和实现类

service接口

package cn.wangju.service;

public interface TestService {

    String testMethod();

}

实现类

package cn.wangju.service;

import com.alibaba.dubbo.config.annotation.Service;

@Service

public class TestServiceImpl implements TestService{

    @Override

    public String testMethod() {

        return "hello world";

    }

}

dubbo_controller下的pom.xml配置文件

<?xml version="1.0" encoding="UTF-8"?>

<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/xsd/maven-4.0.0.xsd">

  <modelVersion>4.0.0</modelVersion>

  <groupId>cn.wangju</groupId>

  <artifactId>dubbo_controller</artifactId>

  <version>1.0-SNAPSHOT</version>

  <packaging>war</packaging>

  <name>dubbo_controller Maven Webapp</name>

  <properties>

    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

    <maven.compiler.source>1.7</maven.compiler.source>

    <maven.compiler.target>1.7</maven.compiler.target>

    <spring.version>4.2.4.RELEASE</spring.version>

  </properties>

  <dependencies>

    <dependency>

      <groupId>junit</groupId>

      <artifactId>junit</artifactId>

      <version>4.11</version>

      <scope>test</scope>

    </dependency>

    <!-- Spring -->

    <dependency>

      <groupId>org.springframework</groupId>

      <artifactId>spring-context</artifactId>

      <version>${spring.version}</version>

    </dependency>

    <dependency>

      <groupId>org.springframework</groupId>

      <artifactId>spring-beans</artifactId>

      <version>${spring.version}</version>

    </dependency>

    <dependency>

      <groupId>org.springframework</groupId>

      <artifactId>spring-webmvc</artifactId>

      <version>${spring.version}</version>

    </dependency>

    <dependency>

      <groupId>org.springframework</groupId>

      <artifactId>spring-jdbc</artifactId>

      <version>${spring.version}</version>

    </dependency>

    <dependency>

      <groupId>org.springframework</groupId>

      <artifactId>spring-aspects</artifactId>

      <version>${spring.version}</version>

    </dependency>

    <dependency>

      <groupId>org.springframework</groupId>

      <artifactId>spring-jms</artifactId>

      <version>${spring.version}</version>

    </dependency>

    <dependency>

      <groupId>org.springframework</groupId>

      <artifactId>spring-context-support</artifactId>

      <version>${spring.version}</version>

    </dependency>

    <!-- dubbo相关 -->

    <dependency>

      <groupId>com.alibaba</groupId>

      <artifactId>dubbo</artifactId>

      <version>2.8.4</version>

    </dependency>

    <dependency>

      <groupId>org.apache.zookeeper</groupId>

      <artifactId>zookeeper</artifactId>

      <version>3.4.6</version>

    </dependency>

    <dependency>

      <groupId>com.github.sgroschupf</groupId>

      <artifactId>zkclient</artifactId>

      <version>0.1</version>

    </dependency>

    <dependency>

      <groupId>javassist</groupId>

      <artifactId>javassist</artifactId>

      <version>3.11.0.GA</version>

    </dependency>

  </dependencies>

  <build>

    <finalName>dubbo_controller</finalName>

    <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->

      <plugins>

        <plugin>

          <artifactId>maven-clean-plugin</artifactId>

          <version>3.1.0</version>

        </plugin>

        <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->

        <plugin>

          <artifactId>maven-resources-plugin</artifactId>

          <version>3.0.2</version>

        </plugin>

        <plugin>

          <artifactId>maven-compiler-plugin</artifactId>

          <version>3.8.0</version>

        </plugin>

        <plugin>

          <artifactId>maven-surefire-plugin</artifactId>

          <version>2.22.1</version>

        </plugin>

        <plugin>

          <artifactId>maven-war-plugin</artifactId>

          <version>3.2.2</version>

        </plugin>

        <plugin>

          <artifactId>maven-install-plugin</artifactId>

          <version>2.5.2</version>

        </plugin>

        <plugin>

          <artifactId>maven-deploy-plugin</artifactId>

          <version>2.8.2</version>

        </plugin>

      </plugins>

    </pluginManagement>

    <plugins>

      <!-- tomcat插件 -->

      <plugin>

        <groupId>org.apache.tomcat.maven</groupId>

        <artifactId>tomcat7-maven-plugin</artifactId>

        <version>2.2</version>

        <configuration>

          <port>1089</port>

          <path>/SSM</path>

          <httpPort>8006</httpPort>

          <uriEncoding>UTF-8</uriEncoding>

          <server>tomcat7</server>

        </configuration>

      </plugin>

    </plugins>

  </build>

</project>

dubbo_controller下的applicationContext-web.xml

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"

       xmlns:context="http://www.springframework.org/schema/context"

       xmlns:dubbo="http://code.alibabatech.com/schema/dubbo" xmlns:mvc="http://www.springframework.org/schema/mvc"

       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd

http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd

http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd

http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

    <!-- 注解驱动 -->

    <mvc:annotation-driven >

        <!-- 将传输的字符串强制转换成utf-8编码, 防止中文乱码 -->

        <mvc:message-converters register-defaults="false">

            <bean class="org.springframework.http.converter.StringHttpMessageConverter">

                <constructor-arg value="UTF-8" />

            </bean>

        </mvc:message-converters>

    </mvc:annotation-driven>

    <!-- 给当前项目服务起个名-->

    <dubbo:application name="dubboxdemo-web" />

    <!-- 配置连接zookepper -->

    <dubbo:registry address="zookeeper://192.168.200.128:2181"/>

    <!-- 配置包扫描, 只有在这个包下面才可以注入service -->

    <dubbo:annotation package="cn.wangju.controller" />

</beans>

dubbo_controller下的web.xml文件

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

         xmlns="http://java.sun.com/xml/ns/javaee"

         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"

         version="2.5">

  <!-- 解决post乱码 -->

  <filter>

    <filter-name>CharacterEncodingFilter</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>CharacterEncodingFilter</filter-name>

    <url-pattern>/*</url-pattern>

  </filter-mapping>

  <!-- 配置springMvc前端控制器 -->

  <servlet>

    <servlet-name>springmvc</servlet-name>

    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

    <!-- 指定加载的配置文件 ，通过参数contextConfigLocation加载-->

    <init-param>

      <param-name>contextConfigLocation</param-name>

      <param-value>classpath:applicationContext-web.xml</param-value>

    </init-param>

  </servlet>

  <servlet-mapping>

    <servlet-name>springmvc</servlet-name>

    <url-pattern>*.do</url-pattern>

  </servlet-mapping>

</web-app>

dubbo_controller下的Controller

package cn.wangju.controller;

import cn.wangju.service.TestService;

import com.alibaba.dubbo.config.annotation.Reference;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.ResponseBody;

@Controller

@RequestMapping("/test")

public class TestController {

    @Reference

    private TestService testService;

    @RequestMapping("/du")

    @ResponseBody

    public String testMethod(){

        return testService.testMethod();

    }

}

dubbo_service下的Service

package cn.wangju.service;

public interface TestService {

    String testMethod();

}

先启动service的tomcat在启动controller下的tomcat

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