在idea和Maven上搭建SSM框架

SSM指的是Spring、SpringMvc和Mybatics。它们的详细内容不作阐述，
开发环境的搭建可参考之前的文章https://blog.youkuaiyun.com/weixin_43845239/article/details/93671221
现在直接开始搭建。

1、新建项目

点击File -> New -> Project

然后选择Maven，勾选Create from archetype，然后选择maven的webapp包，点击next

输入GroupId，然后输入工程的名字，点击next

在Maven home derectory中选择maven的安装位置。然后点击下面的加号，添加property。name输入archetypeCatelog，value输入interal，点击next

点击Finish即可完成新建工程。

2、添加所需文件夹及文件

（1）在main文件夹下新建java、resources文件夹。

（2）将java文件夹标记为SourcesRoot

（3）将resources文件夹标记为ResourcesRoot

（4）在java文件夹新建com.zhongruan.bean.UserInfo的类，系统会自动生成相应的包

若出现包名合并成一个包名后，可以选择不勾选Compat Middle Packages

（5）在zhongruan包下新建controller、dao、service包
在dao包里新建IUserDao接口。
在service包里新建UserService接口，并且新建Impl文件夹。在Impl文件夹里新建UserServiceImpl类。
在controller包里新建UserController类。

（6）在resoureces文件夹下新建mapper文件夹。在mapper文件夹里新建UserMapper.xml文件。新建applicationContext.xml、db.properties、log4j.properties文件。
db.properties、log4j.properties文件的新建过程如下图所示：
右击resources->New->XML Configuration File->Spring Config，输入文件名即可。

示意图：

（7）在webapp文件夹下新建jsp文件夹，在jsp文件夹内新建addUser.jsp、allUser.jsp、updateUser.jsp和user-list.jsp文件

最后工程的框架如下图所示：

3、编写代码

3.1、配置pom.xml文件
在此文件中配置项目所需要的jar包

<?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>com.zhongruan</groupId>
  <artifactId>ssm_day0627</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>

  <name>ssm_day0627 Maven Webapp</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
    <!-- spring版本号 -->
    <spring.version>5.0.2.RELEASE</spring.version>
    <!-- mybatis版本号 -->
    <mybatis.version>3.2.6</mybatis.version>
    <!-- log4j日志文件管理包版本 -->
    <slf4j.version>1.7.7</slf4j.version>
    <log4j.version>1.2.17</log4j.version>
    <c3p0.version>0.9.5.2</c3p0.version>
    <taglibs.version>1.1.2</taglibs.version>
  </properties>

  <dependencies>
    <!-- spring核心包 -->
    <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>${spring.version}</version>
    </dependency>
    <!-- mybatis核心包 -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>${mybatis.version}</version>
    </dependency>
    <!-- mybatis/spring包 -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>1.2.2</version>
    </dependency>
    <!-- 导入java ee jar 包 -->
    <dependency>
      <groupId>javax</groupId>
      <artifactId>javaee-api</artifactId>
      <version>7.0</version>
    </dependency>
    <!-- 导入Mysql数据库链接jar包 -->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.30</version>
    </dependency>
    <!-- 导入dbcp的jar包，用来在applicationContext.xml中配置数据库 -->
    <dependency>
      <groupId>commons-dbcp</groupId>
      <artifactId>commons-dbcp</artifactId>
      <version>1.2.2</version>
    </dependency>
    <!-- JSTL标签类 -->
    <dependency>
      <groupId>jstl</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>
    <!-- 日志文件管理包 -->
    <!-- log start -->
    <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
      <version>${log4j.version}</version>
    </dependency>
    <!-- 数据连接池 -->
    <dependency>
      <groupId>com.mchange</groupId>
      <artifactId>c3p0</artifactId>
      <version>${c3p0.version}</version>
    </dependency>
    <dependency>
      <groupId>taglibs</groupId>
      <artifactId>standard</artifactId>
      <version>${taglibs.version}</version>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-api</artifactId>
      <version>${slf4j.version}</version>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-log4j12</artifactId>
      <version>${slf4j.version}</version>
    </dependency>
    <!-- 导入servlet-api/jsp -->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.1.0</version>
      <scope>provided</scope>
    </dependency>
    <!-- https://mvnrepository.com/artifact/javax.servlet.jsp/javax.servlet.jsp-api -->
    <dependency>
      <groupId>javax.servlet.jsp</groupId>
      <artifactId>javax.servlet.jsp-api</artifactId>
      <version>2.3.1</version>
      <scope>provided</scope>
    </dependency>
  </dependencies>
  <build>
    <finalName>ssm_day0627</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>
  </build>
</project>

3.2、UserInfo类
UserInfo类有3个变量：id、username、password。运用generate功能添加setter、getter和toString方法。

public class UserInfo {
    private int id;
    private String username;
    private String password;
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    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;
    }
    @Override
    public String toString() {
        return "UserInfo{" +
                "id=" + id +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                '}';
    }

3.2、IUserDao接口
在IUserDao接口内添加对数据库进行操作的函数的声明。

public interface IUserDao {
    public List<UserInfo> findAll();
    public int addUser(UserInfo userInfo);
    public int deleteUserById(int id);
    public int updateUser(UserInfo userInfo);
    public UserInfo queryById(int id);
}

3.3、UserMapper.xml
UserMapper用户实现IUserDao接口中的方法。namespace输入dao层的IUserDao接口。select的id为方法名，resultType为返回的结果类型，为UserInfo。select里面输入sql语句。

<?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.zhongruan.dao.IUserDao" >
    <select id="findAll" resultType="com.zhongruan.bean.UserInfo">
        select * from userinfo
    </select>
    
    <select id="queryById" parameterType="int" resultType="com.zhongruan.bean.UserInfo">
        select * from userinfo where id=#{id}
    </select>

    <insert id="addUser" parameterType="com.zhongruan.bean.UserInfo">
        insert into userinfo(username,password)
        value (#{username},#{password})
    </insert>

    <delete id="deleteUserById" parameterType="int">
        delete from userinfo where id=#{id}
    </delete>

    <update id="updateUser" parameterType="com.zhongruan.bean.UserInfo">
        update userinfo set username=#{username},password=#{password} where id=#{id}
    </update>
</mapper>

3.4、applicationContext.xml、db.properties、log4j.properties配置文件

• applicationContext.xml：applicationContext.xml将IUserDao加入到Spring容器中。

<?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:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
		http://www.springframework.org/schema/beans/spring-beans-4.3.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-4.3.xsd">
    <!-- 1.配置数据库相关参数properties的属性：${url} -->
    <context:property-placeholder location="classpath:db.properties"/>
    <!-- 2.配置数据源 -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.driver}"/>
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <property name="user" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
        <property name="maxPoolSize" value="30"/>
        <property name="minPoolSize" value="2"/>
    </bean>
    <!-- 3.配置SqlSessionFactory对象 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 注入数据库连接池 -->
        <property name="dataSource" ref="dataSource"/>
        <!-- 扫描bean包 使用别名 -->
        <property name="typeAliasesPackage" value="com.zhongruan.bean"></property>
        <!--配置加载映射文件 UserMapper.xml-->
        <property name="mapperLocations" value="classpath:mapper/*.xml"/>
    </bean>
    <!-- 自动生成dao,mapper-->
    <!-- 4.配置扫描Dao接口包，动态实现Dao接口，注入到spring容器中 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!-- 给出需要扫描Dao接口包 -->
        <property name="basePackage" value="com.zhongruan.dao"/>
        <!-- 注入sqlSessionFactory -->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
    </bean>
    <!--自动扫描-->
    <context:component-scan base-package="com.zhongruan"/>
    <!-- 配置事务-->
    <!-- 5.配置事务管理器 -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>
    <!-- 6.开启事务注解-->
    <tx:annotation-driven></tx:annotation-driven>
</beans>

• db.properties配置数据库设定，这里的url中3306后面需要写自己的数据库名，username和password需要更改为自己数据库的内容

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/jdbc_test?useSSL=true&characterEncoding=utf-8
jdbc.username=root
jdbc.password=12345678

• log4j.properties配置日志设定

# Global logging configuration
log4j.rootLogger=DEBUG, stdout
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n

3.5、IUserService接口、UserServiceImpl类

• IUserService接口

public interface IUserService {
    public List<UserInfo> findAll();
    public int addUser(UserInfo userInfo);
    public int deleteUserById(int id);
    public int updateUser(UserInfo userInfo);
    public UserInfo queryById(int id);
}

• UserServiceImpl类
  （1）@Service：表示将该类注册到Spring容器中
  （2）@Autowired：表示新建这个对象。如下图所示，声明了UserDao对象后就可以，不用再使用new来初始化这个对象。

@Service
public class UserServiceImpl  implements IUserService {
    @Autowired
    IUserDao userDao;
    @Override
    public List<UserInfo> findAll() {
        return userDao.findAll();
    }
    @Override
    public int addUser(UserInfo userInfo) {
        return userDao.addUser(userInfo);
    }
    @Override
    public int deleteUserById(int id) {
        return userDao.deleteUserById(id);
    }
    @Override
    public int updateUser(UserInfo userInfo) {
        return userDao.updateUser(userInfo);
    }
    @Override
    public UserInfo queryById(int id) {
        return userDao.queryById(id);
    }
}

3.6、addUser.jsp、allUser.jsp、updateUser.jsp页面文件

• addUser.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8" isELIgnored="false"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<html>
<head>
    <title>新增用户</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <!-- 引入 Bootstrap -->
    <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
<div class="container">
    <div class="row clearfix">
        <div class="col-md-12 column">
            <div class="page-header">
                <h1>
                    基于SSM框架的管理系统：简单实现增、删、改、查。
                </h1>
            </div>
        </div>
    </div>
    <div class="row clearfix">
        <div class="col-md-12 column">
            <div class="page-header">
                <h1>
                    <small>新增用户</small>
                </h1>
            </div>
        </div>
    </div>
    <form action="${pageContext.request.contextPath}/user/save.do"
              method="post">
        用&nbsp;&nbsp;户&nbsp;&nbsp;id：<input type="text" name="id"><br><br><br>
        用户姓名：<input type="text" name="username"><br><br><br>
        用户密码：<input type="text" name="password"><br><br><br>
        <input type="submit" value="添加" >
    </form>
</div>

• allUser.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8" isELIgnored="false"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<html>
<head>
    <title>user列表</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <!-- 引入 Bootstrap -->
    <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
<div class="container">
    <div class="row clearfix">
        <div class="col-md-12 column">
            <div class="page-header">
                <h1>
                    基于SSM框架的管理系统：简单实现增、删、改、查。
                </h1>
            </div>
        </div>
    </div>

    <div class="row clearfix">
        <div class="col-md-12 column">
            <div class="page-header">
                <h1>
                    <small>用户列表 —— 显示所有用户</small>
                </h1>
            </div>
        </div>
    </div>
    <div class="row">
        <div class="col-md-4 column">
            <a class="btn btn-primary" href="${pageContext.request.contextPath}/user/toAddUser.do">新增</a>
        </div>
    </div>
    <div class="row clearfix">
        <div class="col-md-12 column">
            <table class="table table-hover table-striped">
                <thead>
                <tr>
                    <th>id</th>
                    <th>用户名</th>
                    <th>密码</th>
                    <th>操作</th>
                </tr>
                </thead>
                <tbody>
                <c:forEach items="${ui}" var="userInfo">
                    <tr>
                        <td>${userInfo.id}</td>
                        <td>${userInfo.username}</td>
                        <td>${userInfo.password}</td>
                        <td>
                            <a href="${pageContext.request.contextPath}/user/toUpdate.do?id=${userInfo.id}">更改</a> |
                            <a href="${pageContext.request.contextPath}/user/delete.do?id=${userInfo.id}">删除</a>
                        </td>
                    </tr>
                </c:forEach>
                </tbody>
            </table>
        </div>
    </div>
</div>

• updateUser.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8" isELIgnored="false"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
    <title>修改论文</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <!-- 引入 Bootstrap -->
    <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
<div class="container">
    <div class="row clearfix">
        <div class="col-md-12 column">
            <div class="page-header">
                <h1>
                    基于SSM框架的管理系统：简单实现增、删、改、查。
                </h1>
            </div>
        </div>
    </div>

    <div class="row clearfix">
        <div class="col-md-12 column">
            <div class="page-header">
                <h1>
                    <small>修改用户</small>
                </h1>
            </div>
        </div>
    </div>

    <form action="${pageContext.request.contextPath}/user/update.do"
          method="post">
        <input type="hidden" name="id" value="${userInfo.id}"/>
        用户姓名：<input type="text" name="username" value="${userInfo.username}"/>
        用户密码：<input type="text" name="password" value="${userInfo.password}"/>
        <input type="submit" value="提交" />
    </form>
</div>

3.7、userController类
@Controller：将此类注册到Spring容器中
@RequestMapping(“”)：标记该地方的url
在findAll方法里我们需要把业务层的数据通过模型上传到视图上面，这里使用ModelAndView类完成。
调用addObject()方法，将数据添加到模型里面。第一个参数为数据的名字用来引用，第二个参数为数据。
调用setViewName()方法，选择模型要送往哪一个页面。函数的参数为在jsp文件夹里要显示的.jsp文件的名字，这里不需要输入.jsp后缀是因为在spring-mvc.xml文件中配置好了

@Controller
@RequestMapping("user")
public class UserController {
    @Autowired
    private IUserService userService;
    
    @RequestMapping("/findAll.do")
    public ModelAndView findAll(){
        List<UserInfo> userinfos=userService.findAll();
        ModelAndView mv= new ModelAndView();
        mv.addObject("ui",userinfos);
        mv.setViewName("allUser");
        return mv;
    }
    @RequestMapping("/toAddUser.do")
        public ModelAndView toAddPaper() {
        ModelAndView mv= new ModelAndView();
        mv.setViewName("addUser");
        return mv;
    }
    @RequestMapping("/save.do")
    public String addUser(UserInfo userInfo) {
        userService.addUser(userInfo);
        return "redirect:/user/findAll.do";
    }
    @RequestMapping("/delete.do")
    public  String deleteUserById(int id){
        userService.deleteUserById(id);
        return "redirect:/user/findAll.do";
    }
    @RequestMapping("/toUpdate.do")
    public String toUpdate(Model model,int id){
        model.addAttribute(userService.queryById(id));
        return "updateUser";
    }
    @RequestMapping("/update.do")
    public String updateUser(UserInfo user){
        userService.updateUser(user);
        return "redirect:/user/findAll.do";
    }
}

3.8、spring-mvc.xml文件

<?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:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
      http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
      http://www.springframework.org/schema/mvc
      http://www.springframework.org/schema/mvc/spring-mvc-4.3.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-4.3.xsd">
    <!-- 1.注解扫描位置-->
    <context:component-scan base-package="com.zhongruan.controller" />
    <!-- 2.配置映射处理和适配器-->
    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"/>
    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"/>
    <!-- 3.视图的解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/jsp/" />
        <property name="suffix" value=".jsp" />
    </bean>
</beans>

3.9、web.xml文件
加载applicationContext.xml、spring-mvc.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">

  <!-- 配置加载类路径的配置文件 -->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath*:applicationContext.xml</param-value>
  </context-param>

  <!-- 配置监听器 -->
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <listener>
    <listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>
  </listener>

  <!-- 解决中文乱码过滤器 -->
  <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>
  </filter>
  <filter-mapping>
    <filter-name>characterEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

  <!-- 前端控制器（加载classpath:spring-mvc.xml 服务器启动创建servlet） -->
  <servlet>
    <servlet-name>dispatcherServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <!-- 配置初始化参数，创建完DispatcherServlet对象，加载springmvc.xml配置文件 -->
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:spring-mvc.xml</param-value>
    </init-param>
    <!-- 服务器启动的时候，让DispatcherServlet对象创建 -->
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>dispatcherServlet</servlet-name>
    <url-pattern>*.do</url-pattern>
  </servlet-mapping>

</web-app>

3.10、index.jsp文件
添加绝对路径，用于指示到UserController的findAll()方法。
在文件的开头添加代码，可以解决中文乱码问题

<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8" isELIgnored="false"%>
<html>
<body>
<h2>Hello World!</h2>
<a href="${pageContext.request.contextPath}/user/findAll.do">查询所有用户</a>
</body>
</html>

4、运行

点击右上角运行图标隔壁的Edit Configuration

点击+号，往下拉，选择Tomcat Server里的Local

点击右边的Configure，在Tomcat—Home选择Tomcat的安装位置

点击Deployment，然后点击右边的+号

选择war exploded

在Name处输入Tomcat7，然后点击OK

出现下图则代表配置Tomcat成功

点击运行

点击查询用户