基于Maven的SSM框架搭建

系统管理员 2022-04-05 12:17 328阅读 0赞

Maven + Spring + Spring MVC + Mybatis + MySQL整合SSM框架

1.数据库准备

本文主要想实现SSM框架的搭建，并基于该框架实现简单的登录功能，那么先新建一张user\_t表：

DROP TABLE IF EXISTS `user_t`;  
      
    CREATE TABLE `user_t` (  
      `id` INT(11) NOT NULL AUTO_INCREMENT,  
      `user_name` VARCHAR(40) NOT NULL,  
      `password` VARCHAR(255) NOT NULL,  
      `age` INT(4) NOT NULL,  
      PRIMARY KEY (`id`)  
    ) ENGINE=INNODB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;

然后再插入一条数据：

INSERT  INTO `user_t`(`id`,`user_name`,`password`,`age`) VALUES (1,'测试','sfasgfaf',24);

为了简单起见，密码暂时先用明文，后面框架搭建成功后在改为MD5加密。

那么查看下user\_login表的内容：

mysql> select * from user_t;
    +----+-----------+----------+-----+
    | id | user_name | password | age |
    +----+-----------+----------+-----+
    |  1 | 测试      | sfasgfaf |  24 |
    +----+-----------+----------+-----+
    1 row in set (0.00 sec)

2.Maven Web项目创建

新建一个Maven Project，然后输入Group Id和Artifact Id，点击Finish就完成了。

3.开始整合Spring Spring MVC Mybatis

用过Maven的都知道，有了Maven就没必要去网上下载一对jar文件然后自己去管理，直接在pom.xml中添加依赖就可以：

<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>20171117</groupId>
     <artifactId>SSM</artifactId>
      <version>0.0.1-SNAPSHOT</version>
      <name>SSM Maven Webapp</name>
      <url>http://maven.apache.org</url>
      
      <parent>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-parent</artifactId>
          <version>1.3.2.RELEASE</version>
          <relativePath></relativePath>
      </parent>
      
       <properties>  
              
            <spring.version>4.0.2.RELEASE</spring.version>  
              
            <mybatis.version>3.2.6</mybatis.version>  
              
            <slf4j.version>1.7.7</slf4j.version>  
            <log4j.version>1.2.17</log4j.version>  
        </properties>  
      
        <dependencies>  
        
    <dependency>
        <groupId>commons-logging</groupId>
        <artifactId>commons-logging</artifactId>
        <version>1.2</version>
    </dependency>
            <dependency>  
                <groupId>junit</groupId>  
                <artifactId>junit</artifactId>  
                <version>4.11</version>  
                  
                <scope>test</scope>  
            </dependency>  
              
            <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>  
              
            <dependency>  
                <groupId>org.mybatis</groupId>  
                <artifactId>mybatis</artifactId>  
                <version>${mybatis.version}</version>  
            </dependency>  
              
            <dependency>  
                <groupId>org.mybatis</groupId>  
                <artifactId>mybatis-spring</artifactId>  
                <version>1.2.2</version>  
            </dependency>  
              
            <dependency>  
                <groupId>javax</groupId>  
                <artifactId>javaee-api</artifactId>  
                <version>7.0</version>  
            </dependency>  
              
            <dependency>  
                <groupId>mysql</groupId>  
                <artifactId>mysql-connector-java</artifactId>  
                <version>5.1.30</version>  
            </dependency>  
              
            <dependency>  
                <groupId>commons-dbcp</groupId>  
                <artifactId>commons-dbcp</artifactId>  
                <version>1.2.2</version>  
            </dependency>  
              
            <dependency>  
                <groupId>jstl</groupId>  
                <artifactId>jstl</artifactId>  
                <version>1.2</version>  
            </dependency>  
              
              
            <dependency>  
                <groupId>log4j</groupId>  
                <artifactId>log4j</artifactId>  
                <version>${log4j.version}</version>  
            </dependency>  
              
              
              
            <dependency>  
                <groupId>com.alibaba</groupId>  
                <artifactId>fastjson</artifactId>  
                <version>1.1.41</version>  
            </dependency>  
      
      
            <dependency>  
                <groupId>org.slf4j</groupId>  
                <artifactId>slf4j-api</artifactId>  
                <version>${slf4j.version}</version>  
            </dependency>  
      
            <dependency>  
                <groupId>org.slf4j</groupId>  
                <artifactId>slf4j-log4j12</artifactId>  
                <version>${slf4j.version}</version>  
            </dependency>  
              
              
            <dependency>  
                <groupId>org.codehaus.jackson</groupId>  
                <artifactId>jackson-mapper-asl</artifactId>  
                <version>1.9.13</version>  
            </dependency>  
              
            <dependency>  
                <groupId>commons-fileupload</groupId>  
                <artifactId>commons-fileupload</artifactId>  
                <version>1.3.1</version>  
            </dependency>  
            <dependency>  
                <groupId>commons-io</groupId>  
                <artifactId>commons-io</artifactId>  
                <version>2.4</version>  
            </dependency>  
            <dependency>  
                <groupId>commons-codec</groupId>  
                <artifactId>commons-codec</artifactId>  
                <version>1.9</version>  
            </dependency>  
        </dependencies>
      <build>
        <finalName>Test</finalName>
      </build>
    </project>

3.1Spring和Mybatis的整合

3.1.1创建数据库属性文件jdbc.properties

driver=com.mysql.jdbc.Driver
    url=jdbc:mysql://10.0.20.252:3306/mybatis
    username=root
    password=Free-Wi11
    initialSize=0
    maxActive=20
    maxIdle=20 
    minIdle=1 
    maxWait=60000

3.1.2创建spring-mybatis配置文件

这个文件就是用来完成spring和mybatis的整合的。这里面也没有多少行配置，主要就是**自动扫描，自动注入，配置数据库**，详细配置如下：

spring-mybatis.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:mvc="http://www.springframework.org/schema/mvc"  
        xsi:schemaLocation="http://www.springframework.org/schema/beans    
                            http://www.springframework.org/schema/beans/spring-beans-3.1.xsd    
                            http://www.springframework.org/schema/context    
                            http://www.springframework.org/schema/context/spring-context-3.1.xsd    
                            http://www.springframework.org/schema/mvc    
                            http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">  
          
        <context:component-scan base-package="com.cn.hnust" />  
          
        <bean id="propertyConfigurer"  
            class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">  
            <property name="location" value="classpath:jdbc.properties" />  
        </bean>  
      
        <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"  
            destroy-method="close">  
            <property name="driverClassName" value="${driver}" />  
            <property name="url" value="${url}" />  
            <property name="username" value="${username}" />  
            <property name="password" value="${password}" />  
              
            <property name="initialSize" value="${initialSize}"></property>  
              
            <property name="maxActive" value="${maxActive}"></property>  
              
            <property name="maxIdle" value="${maxIdle}"></property>  
              
            <property name="minIdle" value="${minIdle}"></property>  
              
            <property name="maxWait" value="${maxWait}"></property>  
        </bean>  
      
          
        <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">  
            <property name="dataSource" ref="dataSource" />  
              
            <property name="mapperLocations" value="classpath:com/cn/hnust/mapping/*.xml"></property>  
        </bean>  
      
          
        <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">  
            <property name="basePackage" value="com.cn.hnust.dao" />  
            <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>  
        </bean>  
      
          
        <bean id="transactionManager"  
            class="org.springframework.jdbc.datasource.DataSourceTransactionManager">  
            <property name="dataSource" ref="dataSource" />  
        </bean>  
      
    </beans>

3.1.3日志的输出配置

为了方便调试，一般都会使用日志来输出信息，Log4j是Apache的一个开放源代码项目，通过使用Log4j，我们可以控制日志信息输送的目的地是控制台，文件，GUI组件，甚至是套接口服务器，NT的事件记录器，UNIX Syslog守护进程等；我们也可以控制每一条日志的输出格式；通过定义每一条日志信息的级别，我们能够更加细致的控制日志的生成过程。

Log4j的配置很简单，而且也是通用的，下面给出一个基本的配置，换到其他项目中也无需做多大的调整。

下面给出配置文件目录：

![1177029-20171119155618374-828379508.png][]

log4j.properties

log4j.rootLogger=INFO,Console,File   
    log4j.appender.Console=org.apache.log4j.ConsoleAppender  
    log4j.appender.Console.Target=System.out
    log4j.appender.Console.layout = org.apache.log4j.PatternLayout  
    log4j.appender.Console.layout.ConversionPattern=[%c] - %m%n   
    log4j.appender.File = org.apache.log4j.RollingFileAppender    
    log4j.appender.File.File = logs/ssm.log  
    log4j.appender.File.MaxFileSize = 10MB  
    log4j.appender.File.Threshold = ALL  
    log4j.appender.File.layout = org.apache.log4j.PatternLayout  
    log4j.appender.File.layout.ConversionPattern =[%p] [%d{yyyy-MM-dd HH\:mm\:ss}][%c]%m%n

3.1.4JUnit测试

经过以上步骤，我们已经完成了Spring和Mybatis的整合，这样就可以编写一段测试代码来检验Spring和Mybatis是否整合成功了。

3.1.4.1创建实体类User

User.java

package com.cn.hnust.pojo;
    
    public class User {
        private int id;
        private String user_name;
        private String password;
        public int getId() {
            return id;
        }
        public void setId(int id) {
            this.id = id;
        }
        public String getUser_name() {
            return user_name;
        }
        public void setUser_name(String user_name) {
            this.user_name = user_name;
        }
        public String getPassword() {
            return password;
        }
        public void setPassword(String password) {
            this.password = password;
        }
        
        
    }

3.1.4.2创建Dao接口，UserDao

UserDao.java

package com.cn.hnust.dao;
    
    import org.apache.ibatis.annotations.Select;
    import org.springframework.stereotype.Repository;
    
    import com.cn.hnust.pojo.User;
    @Repository
    public interface UserDao {
    //    @Select("select * from user_t where id=#{userId}")
        public User selectByPrimaryKey(int userId);
    }

3.1.4.3User类与数据库user\_t表的映射文件UserMapper.xml

UserMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
    <!DOCTYPE mapper
    PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
    "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
    <mapper namespace="com.cn.hnust.dao.UserDao">
    
        <resultMap type="com.cn.hnust.pojo.User" id="UserResult">
            <result property="id" column="id"/>
            <result property="user_name" column="user_ame"/>
            <result property="password" column="password"/>
        </resultMap>
        
        <select id="selectByPrimaryKey" parameterType="Integer" resultMap="UserResult">
            select * from user_t where id=#{userId}
        </select>
    </mapper>

3.1.4.4建立Service接口IUserService

IUserService.java

package com.cn.hnust.service;
    
    import com.cn.hnust.pojo.User;
    
    public interface IUserService {
     public User getUserById(int userId);
    }

3.1.4.5建立IUserService接口的实现类UserServiceImpl

UserServiceImpl.java

package com.cn.hnust.service.impl;
    
    import javax.annotation.Resource;
    
    import org.springframework.stereotype.Service;
    
    import com.cn.hnust.dao.UserDao;
    import com.cn.hnust.pojo.User;
    import com.cn.hnust.service.IUserService;
    
    @Service("userService")
    public class UserServiceImpl implements IUserService {
        @Resource
        private UserDao userDao;
    
        public User getUserById(int userId) {
            // TODO Auto-generated method stub
            return this.userDao.selectByPrimaryKey(userId);
        }
        
    
    }

![1177029-20171119160554437-531806203.png][]

3.1.4.6建立测试类

测试类在src/test/java中建立，如果使用了Spring那么就可以使用注解的方式来引入配置文件和类，然后将service接口对象注入，就可以进行测试了。

如果测试成功，表示Spring和Mybatis已经整合成功了。输出信息使用的是Log4j打印到控制台。

TestMyBatis.java

package org.zsl.testmybatis;  
      
    import javax.annotation.Resource;  
      
    import org.apache.log4j.Logger;  
    import org.junit.Before;  
    import org.junit.Test;  
    import org.junit.runner.RunWith;  
    import org.springframework.context.ApplicationContext;  
    import org.springframework.context.support.ClassPathXmlApplicationContext;  
    import org.springframework.test.context.ContextConfiguration;  
    import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;  
      
    import com.alibaba.fastjson.JSON;  
    import com.cn.hnust.pojo.User;  
    import com.cn.hnust.service.IUserService;  
      
    @RunWith(SpringJUnit4ClassRunner.class)     //表示继承了SpringJUnit4ClassRunner类  
    @ContextConfiguration(locations = {"classpath:spring-mybatis.xml"})  
      
    public class TestMyBatis {  
        private static Logger logger = Logger.getLogger(TestMyBatis.class);  
    //  private ApplicationContext ac = null;  
        @Resource  
        private IUserService userService = null;  
      
    //  @Before  
    //  public void before() {  
    //      ac = new ClassPathXmlApplicationContext("applicationContext.xml");  
    //      userService = (IUserService) ac.getBean("userService");  
    //  }  
      
        @Test  
        public void test1() {  
            User user = userService.getUserById(1);  
            // System.out.println(user.getUserName());  
            // logger.info("值："+user.getUserName());
    //        System.out.println(user.getUser_name());
            logger.info(user.getId() + ".................." + user.getUser_name() + "........." + user.getPassword());  
        }  
    }

![1177029-20171119160956327-1066328102.png][]

Run As -> JUnit Test

运行结果:

![1177029-20171119161117218-999098043.png][]

至此，完成了Spring和Mybatis这两大框架的整合，下面将继续进行SpringMVC整合进项目中。

3.2整合Spring MVC

3.2.1配置spring-mvc.xml

配置里面的注释很详细，在此就补多少了，主要是**自动扫描控制器，视图模式，注解的启动**着三个。

spring-mvc.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:mvc="http://www.springframework.org/schema/mvc"  
        xsi:schemaLocation="http://www.springframework.org/schema/beans    
                            http://www.springframework.org/schema/beans/spring-beans-3.1.xsd    
                            http://www.springframework.org/schema/context    
                            http://www.springframework.org/schema/context/spring-context-3.1.xsd    
                            http://www.springframework.org/schema/mvc    
                            http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">  
          
        <context:component-scan base-package="com.cn.hnust.controller" />  
          
        <bean id="mappingJacksonHttpMessageConverter"  
            class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">  
            <property name="supportedMediaTypes">  
                <list>  
                    <value>text/html;charset=UTF-8</value>  
                </list>  
            </property>  
        </bean>  
          
        <bean  
            class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">  
            <property name="messageConverters">  
                <list>  
                    <ref bean="mappingJacksonHttpMessageConverter" />   
                </list>  
            </property>  
        </bean>  
          
        <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">  
              
            <property name="prefix" value="/WEB-INF/pages/" />  
            <property name="suffix" value=".jsp" />  
        </bean>  
          
          
        <bean id="multipartResolver"    
            class="org.springframework.web.multipart.commons.CommonsMultipartResolver">    
              
            <property name="defaultEncoding" value="utf-8" />    
              
            <property name="maxUploadSize" value="10485760000" />    
              
            <property name="maxInMemorySize" value="40960" />    
        </bean>   
      
    </beans>

3.2.2配置web.xml文件

这里面对spring-mybatis.xml的引入以及配置的spring-mvc的Servlet就是为了完成SSM整合，之前Spring和Mybatis整合不需要再此处进行任何配置。配置一样有详细的注释。

web.xml

![1177029-20171119161625312-1812947302.png][]

<?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"  
        version="3.0">  
        <display-name>Archetype Created Web Application</display-name>  
          
        <context-param>  
            <param-name>contextConfigLocation</param-name>  
            <param-value>classpath:spring-mybatis.xml</param-value>  
        </context-param>  
          
        <filter>  
            <filter-name>encodingFilter</filter-name>  
            <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>  
            <async-supported>true</async-supported>  
            <init-param>  
                <param-name>encoding</param-name>  
                <param-value>UTF-8</param-value>  
            </init-param>  
        </filter>  
        <filter-mapping>  
            <filter-name>encodingFilter</filter-name>  
            <url-pattern>/*</url-pattern>  
        </filter-mapping>  
          
        <listener>  
            <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>  
        </listener>  
          
        <listener>  
            <listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class>  
        </listener>  
      
          
        <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>  
            <async-supported>true</async-supported>  
        </servlet>  
        <servlet-mapping>  
            <servlet-name>SpringMVC</servlet-name>  
              
            <url-pattern>/</url-pattern>  
        </servlet-mapping>  
        <welcome-file-list>  
            <welcome-file>/index.jsp</welcome-file>  
        </welcome-file-list>  
      
    </web-app>

3.3测试

至此已经完成了SSM三大框架的整合了，接下来测试一下。

3.3.1新建jsp页面

![1177029-20171119161814390-850606225.png][]

success.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
        pageEncoding="ISO-8859-1"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
    <title>Success</title>
    </head>
    <body>
        <p>login success</p>
    </body>
    </html>

fail.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
        pageEncoding="ISO-8859-1"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
    <title>fail</title>
    </head>
    <body>
        <p>login fail</p>
    </body>
    </html>

3.3.2建立UserController类

UserController.java 控制器

![1177029-20171119161952515-1424690634.png][]

package com.cn.hnust.controller;
    
    import javax.annotation.Resource;
    import javax.servlet.http.HttpServletRequest;
    
    import org.springframework.stereotype.Controller;
    import org.springframework.ui.Model;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.ResponseBody;
    
    import com.cn.hnust.pojo.User;
    import com.cn.hnust.service.IUserService;
    
    @Controller  
    @RequestMapping("/user")  
    public class UserController {  
       @Resource  
       private IUserService userService;  
         
       @RequestMapping("/showUser")
       @ResponseBody
       public String toIndex(HttpServletRequest request,Model model){  
           int userId = Integer.parseInt(request.getParameter("id"));  
           User user = this.userService.getUserById(userId);  
           model.addAttribute("user", user);  
           System.out.println(user.getPassword());
           if ( user.getPassword().equals("12345") ) {
               return "success" + user.getPassword();
           } else {
               return "fail" + user.getPassword();
           }
    //       return "success";  
       }  
    }

这个控制器写的比较简单，就是从浏览器访问/user/showUser?id=1，然后去数据库中取出id为1的用户的信息，判断该用户的密码和“12345”是否相同，如果相同则返回success字符串 + 该用户的密码，否则返回fail字符串 + 该用户的密码，由之前我们存到数据库中的id=1的用户的密码来看，其显然应该返回fail + 该用户的密码：

3.3.3部署项目

Run As -> Run On Server

在浏览器中输入http://localhost:8080/Test/user/showUser?id=1，运行的结果为：

![1177029-20171119162552859-1996053797.png][]

至此，SSM三大框架的整合就完成了，在此基础上可以再太你家啊其他功能。

也可以对UserController进行修改：

package com.cn.hnust.controller;
    
    import javax.annotation.Resource;
    import javax.servlet.http.HttpServletRequest;
    
    import org.springframework.stereotype.Controller;
    import org.springframework.ui.Model;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.ResponseBody;
    
    import com.cn.hnust.pojo.User;
    import com.cn.hnust.service.IUserService;
    
    @Controller  
    @RequestMapping("/user")  
    public class UserController {  
       @Resource  
       private IUserService userService;  
         
       @RequestMapping("/showUser")
    //   @ResponseBody
       public String toIndex(HttpServletRequest request,Model model){  
           int userId = Integer.parseInt(request.getParameter("id"));  
           User user = this.userService.getUserById(userId);  
           model.addAttribute("user", user);  
           System.out.println(user.getPassword());
           if ( user.getPassword().equals("12345") ) {
    //           return "success" + user.getPassword();
               return "success";
           } else {
    //           return "fail" + user.getPassword();
           }
    //       return "success";  
           return "fail";
       }  
    }

验证id=1的用户的密码是否是“12345”，如果是则返回success.jsp页面，否则返回fail.jsp页面，注意去掉了@ResponseBody的注解，返回的就是页面

运行结果：

![1177029-20171119162957437-967499492.png][]

[1177029-20171119155618374-828379508.png]: /images/20220405/93ee283dcac542db990e2ee8e20c66d0.png
[1177029-20171119160554437-531806203.png]: /images/20220405/b13df957ecc9463fb2c7171ab40ccb20.png
[1177029-20171119160956327-1066328102.png]: /images/20220405/18fb2e6eddce4af8b676f02ddc100fca.png
[1177029-20171119161117218-999098043.png]: /images/20220405/4cb64d0788b443a79af3bb361d6a02c3.png
[1177029-20171119161625312-1812947302.png]: /images/20220405/441b2ac4729c405abf8008f143d305d6.png
[1177029-20171119161814390-850606225.png]: /images/20220405/c6d357cf0841431590cb0775c0c6f173.png
[1177029-20171119161952515-1424690634.png]: /images/20220405/6b4a3c15afce46b3b18fdc1fab116200.png
[1177029-20171119162552859-1996053797.png]: /images/20220405/f2bd690ea9e8418f9e04e2382c25e6e2.png
[1177029-20171119162957437-967499492.png]: /images/20220405/b1bb756d565f4d3e9bd96c1b37c9543b.png