Maven+Spring+MySql 登陆实例

　　近来无事，复习复习Spring相关知识，从《Spring企业应用开发实战》这本书开始。

　　本文为学习《Spring企业应用开发实战》总结，著作权归原作者。

一、用Maven建立web项目

　　此处参考 张果 博客，在此表示感谢。原文地址：http://www.cnblogs.com/best/p/5638827.html

1.点击“File”->“New”->"Other"->输入“Maven”，新建一个“Maven Project”，如下图所示：

2.请勾选“Create a simple project”，创建一个简单的项目，不使用模板。也可以使用模板，选择WebApp，不过这里就不应该勾选。如下图所示：

3.填写好包名、项目名，选择打包类型为：war，如下图所示：

4.项目创建好后可能会发现有错误，选择项目，右键“属性properties”->"层面Project Facets"->"Java"修改版本号为1.8，默认为1.5；点击“Ok”保存后关闭。如下图所示：

5.重复上一个步骤，反勾Dynamic Web Module，将项目暂时变成非Web项目。点击“Ok”保存后关闭。

6.重复上一步骤，再进层面属性，勾选“Dynamic Web Module”选择Version为3.0。点击左下角的超链接“Further Configuration available...“。

7.勾选“Generate web.xml deployment descriptor”生成web.xml部署描述文件。点击“Ok”保存后关闭。

8.将生成的WebContent目录下的两个文件夹“META-INF”与“WEB-INF”复制到src/main/webapp目录下。

9.删除WebContent目录。

10.删除后会发现项目的pom.xml文件报错，是因为找不到指定位置的web.xml文件引起的。再进入项目的属性，选择“Deployment Assembly”项目部署项，删除“src/test/java”、“src/test/resources”与“WebContent”目录，因为这三项不需要部署出去。

11.点击“Add添加”后选择“Folder文件夹”为项目的最终部署结果指定Web内容根文件夹。

12.选择src\main\webapp目录为目标目录，点击“Finish完成”保存并关闭。

13.如果此时项目还报错，随便修改pom.xml文件后保存后应该错误会消失。

14.此后项目运行需要添加tomcat运行环境就不赘述了。

二、类包规划，添加依赖，数据库准备

1.类包规划

2.pom.xml中添加lib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/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
     <groupId>com.adam</groupId>
     <artifactId>Chapter2</artifactId>
     <version>0.0.1-SNAPSHOT</version>
     <packaging>war</packaging>
     <properties>
         <!-- springframe 版本控制 -->
         <spring.version>4.1.1.RELEASE</spring.version>
     </properties>

     <dependencies>
         <!-- springframe start -->
         <dependency>
             <groupId>org.springframework</groupId>
             <artifactId>spring-core</artifactId>
             <version>${spring.version}</version>
         </dependency>

         <dependency>
             <groupId>org.springframework</groupId>
             <artifactId>spring-web</artifactId>
             <version>${spring.version}</version>
         </dependency>

         <dependency>
             <groupId>org.springframework</groupId>
             <artifactId>spring-oxm</artifactId>
             <version>${spring.version}</version>
         </dependency>

         <dependency>
             <groupId>org.springframework</groupId>
             <artifactId>spring-tx</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-webmvc</artifactId>
             <version>${spring.version}</version>
         </dependency>

         <dependency>
             <groupId>org.springframework</groupId>
             <artifactId>spring-aop</artifactId>
             <version>${spring.version}</version>
         </dependency>

         <dependency>
             <groupId>org.springframework</groupId>
             <artifactId>spring-context-support</artifactId>
             <version>${spring.version}</version>
         </dependency>

         <dependency>
             <groupId>org.springframework</groupId>
             <artifactId>spring-test</artifactId>
             <version>${spring.version}</version>
         </dependency>
         <!-- springframe end -->

         <!--mysql数据库驱动 -->
         <dependency>
             <groupId>mysql</groupId>
             <artifactId>mysql-connector-java</artifactId>
             <version>5.1.38</version>
         </dependency>
         <!--log4j日志包 -->
         <dependency>
             <groupId>org.apache.logging.log4j</groupId>
             <artifactId>log4j-core</artifactId>
             <version>2.6.1</version>
         </dependency>
         <!-- JUnit单元测试工具 -->
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
             <version>4.10</version>
         </dependency>
         <!-- aspectJ AOP 织入器 -->
         <dependency>
             <groupId>org.aspectj</groupId>
             <artifactId>aspectjweaver</artifactId>
             <version>1.8.9</version>
         </dependency>
         <!-- jstl -->
         <dependency>
             <groupId>javax.servlet</groupId>
             <artifactId>jstl</artifactId>
             <version>1.2</version>
         </dependency>
     </dependencies>

     <build>
         <plugins>
             <!-- define the project compile level -->
             <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>
         </plugins>
     </build>
 </project>

　　如果eclise没有自动下载jar包，右键“属性properties”->"Maven"->"Update Project..",强制更新。

3.数据库准备

　　建立数据库sampledb，添加两张表，结构如下：

　　t_user为用户信息表，t_login_log为用户登录日志表。表的引擎要指定InnoDB,因为该引擎支持事务。

　　初始化一条数据，用户名和密码用于测试登录。

三、持久层

1.建立领域对象（实体类）

User.java

 package com.adam.domain;

 import java.io.Serializable;
 import java.util.Date;

 public class User implements Serializable {
     private int userId;
     private String userName;
     private String password;
     private int credits;
     private String lastIp;
     private Date lastVisit;

     public int getUserId() {
         return userId;
     }

     public void setUserId(int userId) {
         this.userId = userId;
     }

     public String getUserName() {
         return userName;
     }

     public void setUserName(String userName) {
         this.userName = userName;
     }

     public String getPassword() {
         return password;
     }

     public void setPassword(String password) {
         this.password = password;
     }

     public int getCredits() {
         return credits;
     }

     public void setCredits(int credits) {
         this.credits = credits;
     }

     public String getLastIp() {
         return lastIp;
     }

     public void setLastIp(String lastIp) {
         this.lastIp = lastIp;
     }

     public Date getLastVisit() {
         return lastVisit;
     }

     public void setLastVisit(Date lastVisit) {
         this.lastVisit = lastVisit;
     }

 }

LoginLog.java

 package com.adam.domain;

 import java.io.Serializable;
 import java.util.Date;

 public class LoginLog implements Serializable {
     private int loginLogId;
     private int userId;
     private String ip;
     private Date loginDate;

     public int getLoginLogId() {
         return loginLogId;
     }

     public void setLoginLogId(int loginLogId) {
         this.loginLogId = loginLogId;
     }

     public int getUserId() {
         return userId;
     }

     public void setUserId(int userId) {
         this.userId = userId;
     }

     public String getIp() {
         return ip;
     }

     public void setIp(String ip) {
         this.ip = ip;
     }

     public Date getLoginDate() {
         return loginDate;
     }

     public void setLoginDate(Date loginDate) {
         this.loginDate = loginDate;
     }

 }

2.数据处理对象

UserDao.java

 package com.adam.dao;

 import java.sql.ResultSet;
 import java.sql.SQLException;

 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.jdbc.core.JdbcTemplate;
 import org.springframework.jdbc.core.RowCallbackHandler;
 import org.springframework.stereotype.Repository;

 import com.adam.domain.User;

 @Repository
 public class UserDao {
     @Autowired
     private JdbcTemplate jdbcTemplate;

     public int getMatchCount(String name, String password) {
         String sql = "SELECT count(*) FROM t_user WHERE user_name = ? and password = ?";
         return jdbcTemplate.queryForInt(sql, new Object[] { name, password });
     }

     public User findUserByName(final String name) {
         String sql = "select user_id,user_name,credits from t_user where user_name = ?";
         final User user = new User();
         jdbcTemplate.query(sql, new Object[] { name }, new RowCallbackHandler() {

             public void processRow(ResultSet rs) throws SQLException {
                 user.setUserId(rs.getInt("user_id"));
                 user.setUserName(name);
                 user.setCredits(rs.getInt("credits"));
             }
         });
         return user;
     }

     public void updateLoginInfo(User user) {
         String sql = "update t_user set last_visit = ?,last_ip = ?, credits = ? where user_id = ?";
         jdbcTemplate.update(sql,
                 new Object[] { user.getLastVisit(), user.getLastIp(), user.getCredits(), user.getUserId() });
     }
 }

LoginLogDao.java

 package com.adam.dao;

 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.jdbc.core.JdbcTemplate;
 import org.springframework.stereotype.Repository;

 import com.adam.domain.LoginLog;

 @Repository
 public class LoginLogDao {
     @Autowired
     private JdbcTemplate jdbcTemplate;

     public void insertLoginLog(LoginLog loginLog) {
         String sql = "insert into t_login_log(user_id, ip,login_datatime) values(?,?,?)";
         Object[] pra = { loginLog.getUserId(), loginLog.getIp(), loginLog.getLoginDate() };
         jdbcTemplate.update(sql, pra);
     }
 }

3.在spring中装配Dao

　　在Dao中并没有打开或释放数据库连接，那么Dao是如何访问数据库的？而且在Dao中使用的JdbcTemplate是从哪来的？这都是spring帮我们实现的，所以需要在spring中装配Dao。

　　创建spring配置文件applicationContext.xml,结构如下

 <?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:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"
     xmlns:tx="http://www.springframework.org/schema/tx"
     xsi:schemaLocation="http://www.springframework.org/schema/beans
         http://www.springframework.org/schema/beans/spring-beans.xsd
         http://www.springframework.org/schema/context
         http://www.springframework.org/schema/context/spring-context-4.3.xsd
         http://www.springframework.org/schema/aop
         http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
         http://www.springframework.org/schema/tx
         http://www.springframework.org/schema/tx/spring-tx.xsd">
     ...
 </beans>

　　在其中加入配置信息

 <!-- 扫描包，应用注解 -->
     <context:component-scan base-package="com.adam.dao" />
 <!--定义一个jdbc数据源，创建一个驱动管理数据源的bean -->
     <bean id="jdbcDataSource"
         class="org.springframework.jdbc.datasource.DriverManagerDataSource">
         <property name="driverClassName" value="com.mysql.jdbc.Driver" />
         <property name="url" value="jdbc:mysql://localhost:3306/sampledb" />
         <property name="username" value="root" />
         <property name="password" value="AdamJin" />
     </bean>
 <!-- 定义jdbc模板Bean -->
     <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate"
         p:dataSource-ref="jdbcDataSource" />

四、业务层

1.建立业务处理类

UserService.java

 package com.adam.service;

 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;

 import com.adam.dao.LoginLogDao;
 import com.adam.dao.UserDao;
 import com.adam.domain.LoginLog;
 import com.adam.domain.User;

 @Service
 public class UserService {
     @Autowired
     private UserDao userdao;
     @Autowired
     private LoginLogDao loginLogDao;

     public boolean hasMatchUser(String name, String password) {
         int matchCount = userdao.getMatchCount(name, password);
         return matchCount > 0;
     }

     public User findUserByUsername(String username) {
         return userdao.findUserByName(username);
     }

     public void loginSuccess(User user) {
         user.setCredits(user.getCredits() + 5);
         LoginLog loginLog = new LoginLog();
         loginLog.setUserId(user.getUserId());
         loginLog.setIp(user.getLastIp());
         loginLog.setLoginDate(user.getLastVisit());
         userdao.updateLoginInfo(user);
         loginLogDao.insertLoginLog(loginLog);
     }
 }

2.在spring中装配Service

　　打开刚建立的applicationContext.xml，在其中添加

 <!-- 扫描包，应用注解 -->
     <context:component-scan base-package="com.adam.service" />
 <!-- 配置事务管理器 -->
     <bean id="transactionManager"
         class="org.springframework.jdbc.datasource.DataSourceTransactionManager"
         p:dataSource-ref="jdbcDataSource" />

 <!-- 通过AOP配置事务增强，让service包下所有Bean的所有方法拥有事务 -->
     <aop:config proxy-target-class="true">
         <aop:pointcut expression="execution(* com.adam.service..*(..))"
             id="serviceMethod" />
         <aop:advisor advice-ref="txAdvice" pointcut-ref="serviceMethod" />
     </aop:config>
     <tx:advice id="txAdvice" transaction-manager="transactionManager">
         <tx:attributes>
             <tx:method name="*"></tx:method>
         </tx:attributes>
     </tx:advice>

　　至此后端就算完成了，可以进行单元测试了。

五、单元测试

　　右击New->Other选择如图，创建单元测试类

TestUserService.java

 package com.adam.test;
 import static org.junit.Assert.*;

 import java.util.Date;

 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.test.context.ContextConfiguration;
 import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

 import com.adam.domain.User;
 import com.adam.service.UserService;

 @RunWith(SpringJUnit4ClassRunner.class)
 @ContextConfiguration(locations = { "/applicationContext.xml" })
 public class TestUserService {
     @Autowired
     private UserService userService;

     @Test
     public void hasMatchedUser() {
         boolean b1 = userService.hasMatchUser("admin", "123456");
         boolean b2 = userService.hasMatchUser("admin", "1236");

         assertTrue(b1);
         assertTrue(!b2);
     }

     @Test
     public void findUserByUsername(){
         User user = userService.findUserByUsername("admin");
         assertEquals(user.getUserName(), "admin");
         user.setLastIp("192.168.11.188");
         user.setLastVisit(new Date());
         userService.loginSuccess(user);
     }

 }

Run As -> JUnit Test得到以下结果，便测试成功，数据库也会多出登陆日志数据。

六、展示层

　　业务层和持久层开发任务结束，需要界面提供展示。

1.配置Spring MVC框架

修改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_3_0.xsd"
     id="WebApp_ID" version="3.0">
     <!-- 从类路径下载spring配置文件 -->
     <context-param>
         <param-name>contextConfigLocation</param-name>
         <param-value>
             classpath:applicationContext.xml
         </param-value>
     </context-param>
     <!-- 负责启动spring容器监听器，将引用上面的上下文参数获取spring配置文件地址 -->
     <listener>
         <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
     </listener>
     <!-- springMVC主控制servlet -->
     <servlet>
         <servlet-name>adam</servlet-name>
         <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
         <init-param>
             <param-name>contextConfigLocation</param-name>
             <param-value>classpath:adam-servlet.xml</param-value>
         </init-param>
         <load-on-startup>2</load-on-startup>
     </servlet>
     <!-- springMVC处理的url -->
     <servlet-mapping>
         <servlet-name>adam</servlet-name>
         <url-pattern>*.html</url-pattern>
     </servlet-mapping>
 </web-app>

注意：上面代码23行若不配置，spring会到WEB-INF下找*-servle.xml,*是servlet配置的name。

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

     <!-- 扫描包，应用注解 -->
     <context:component-scan base-package="com.adam.web" />

     <!-- 配置视图解析器 -->
     <bean
         class="org.springframework.web.servlet.view.InternalResourceViewResolver"
         p:viewClass="org.springframework.web.servlet.view.JstlView" p:prefix="/WEB-INF/jsp/"
         p:suffix=".jsp" />

 </beans>

2.控制器类

LoginController.java

 package com.adam.web;

 import java.util.Date;

 import javax.servlet.http.HttpServletRequest;

 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.servlet.ModelAndView;

 import com.adam.domain.User;
 import com.adam.service.UserService;

 @Controller
 public class LoginController {
     @Autowired
     private UserService userService;

     @RequestMapping(value = "/index.html")
     public String loginPage() {
         return "login";
     }

     @RequestMapping(value = "/loginCheck.html")
     public ModelAndView loginCheck(HttpServletRequest request, LoginCommand loginCommand){
         boolean isVaildUser = userService.hasMatchUser(loginCommand.getUsername(), loginCommand.getPassword());
         if(!isVaildUser){
             return new ModelAndView("login", "error", "用户名或密码错误");
         }else{
             User user = userService.findUserByUsername(loginCommand.getUsername());
             user.setLastIp(request.getLocalAddr());
             user.setLastVisit(new Date());
             userService.loginSuccess(user);
             request.getSession().setAttribute("user", user);
             return new ModelAndView("main");
         }
     }
 }

其中需要一个表单pojo

LoginCommand.java

 package com.adam.web;

 public class LoginCommand {
     private String username;
     private String password;

     public String getUsername() {
         return username;
     }

     public void setUsername(String username) {
         this.username = username;
     }

     public String getPassword() {
         return password;
     }

     public void setPassword(String password) {
         this.password = password;
     }

 }

3.jsp视图页面

　　在WEB-INF下建立文件夹jsp，并新建以下文件。

login.jsp

 <%@ page language="java" contentType="text/html; charset=UTF-8"
     pageEncoding="UTF-8"%>
 <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
 <html>
 <head>
 <title>登陆</title>
 </head>
 <body>
     <c:if test="${!empty error}">
         <font color="red"><c:out value="${error}" /></font>
     </c:if>
     <form action="<c:url value="/loginCheck.html"/>" method="post">
         用户名： <input type="text" name="username"> <br /> 密&nbsp;&nbsp;&nbsp;码： <input
             type="password" name="password"> <br /> <input type="submit"
             value="提交"> <input type="reset" value="重置">
     </form>
 </body>
 </html>

main.jsp

 <%@ page language="java" contentType="text/html; charset=UTF-8"
     pageEncoding="UTF-8"%>
 <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
 <html>
 <head>
 <title>首页</title>
 </head>
 <body>${user.userName},欢迎您，您的积分是${user.credits}。
 </body>
 </html>

到此，整个实例就完成了。

七、运行

Run As -> Run on Server,输入地址 http://localhost:8080/Chapter2/index.html 便会看到

输入正确的信息即可登录成功

八、源码下载

点击下载