SSM框架的集成及登录功能的实现

工程结构 maven+ssm+bootstrap实现简单的增删改查 ：

pom文件：

<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.summer</groupId>
  <artifactId>ssmdemo</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>war</packaging>

  <dependencies>
        <!-- springMVC -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>4.3.7.RELEASE</version>
        </dependency>

        <!-- spring jdbc -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>4.3.7.RELEASE</version>
        </dependency>

        <!-- spring aop  -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aspects</artifactId>
            <version>4.3.7.RELEASE</version>
        </dependency>

        <!-- mybatis -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.2</version>
        </dependency>

        <!-- mybatis与spring整合 -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.1</version>
        </dependency>
        <!-- 数据库连接池 和驱动-->
        <dependency>
        <groupId>c3p0</groupId>
        <artifactId>c3p0</artifactId>
        <version>0.9.1.2</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.40</version>
        </dependency>

        <!-- jstl junit servlet-api -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
            <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
            </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>

        <!-- spring单元测试 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>4.3.7.RELEASE</version>
            <scope>test</scope>
        </dependency>

        <!-- 引入Mybatis分页插件 -->
        <!-- 引入5.0版本在测试的时候会报错 4.2版本也会报错
        4.2版本总是出现String无法转换为某个对象的错误 
         -->
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper</artifactId>
            <version>4.1.5</version>
        </dependency>
        </dependencies>
</project>

jar包一览 

1:实体类:

package com.ssm.model;
/**
 * 描述:用户实体类
 * @version
 */
public class User {

    //主键
    private int id;
    //用户名
    private String username;
    //年龄
    private String age;

    public User() {
        super();
    }

    public User(int id, String username, String age) {
        super();
        this.id = id;
        this.username = username;
        this.age = age;
    }

    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 getAge() {
        return age;
    }

    public void setAge(String age) {
        this.age = age;
    }

}

2:*创建DAO接口【在mybatis中 mapper就相当于dao】*

package com.ssm.mapper;

import java.util.List;

import com.ssm.model.User;
/**
 * 描述:用户mapper接口
 * @version
 */
public interface UserMapper {

    void saveUser(User user);

    boolean updateUser(User user);

    boolean deleteUser(int id);

    User findUserById(int id);

    List<User> findAll();
}

*3:实现dao接口【mybatis中就是UserMapper.xml文件】*

<?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">    
<!--     
    namespace：必须与对应的接口全类名一致  UserMapper.java  
    id ：必须与对应接口的某个对应的方法名一致即必须要和UserMapper.java接口中的方法同名。  
 -->    
 <mapper namespace="com.ssm.mapper.UserMapper">  

      <!-- 新增 -->
      <insert id="saveUser" parameterType="User"  >
         insert into t_user(user_name,user_age) values (#{username},#{age})
      </insert>

      <!-- 修改 -->
      <update id="updateUser" parameterType="User" >
        update t_user set user_name=#{username},user_age=#{age} where user_id=#{id}
      </update>

      <!-- 删除 -->
      <delete id="deleteUser" parameterType="int">
          delete from t_user where user_id=#{id}    
      </delete>

      <!-- 根据id查找单个用户 -->
      <select id="findUserById" parameterType="int" resultType="User">
         select user_id id,user_name username,user_age age from t_user where user_id=#{id}    
      </select>

      <!-- 查询所有 -->
       <select id="findAll" resultType="User">    
         select user_id id,user_name userName,user_age age from t_user    
       </select>  
 </mapper>  

4：spring配置文件
<?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:aop="http://www.springframework.org/schema/aop"
    xmlns:tx="http://www.springframework.org/schema/tx" xmlns:mvc="http://www.springframework.org/schema/mvc"
    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/aop
         http://www.springframework.org/schema/aop/spring-aop.xsd
         http://www.springframework.org/schema/context 
         http://www.springframework.org/schema/context/spring-context.xsd
         http://www.springframework.org/schema/tx 
         http://www.springframework.org/schema/tx/spring-tx.xsd
         http://www.springframework.org/schema/mvc
         http://www.springframework.org/schema/mvc/spring-mvc.xsd
        ">

        <!-- 注解扫描包 -->
        <context:component-scan base-package="com.summer" />
        <!-- 加载jdbc.properties文件  -->

        <context:property-placeholder location="classpath:jdbc.properties"/>
        <!--第一步: 配置数据源 -->
        <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
            <property name="jdbcUrl" value="${jdbc.url}"></property>
            <property name="driverClass" value="${jdbc.driver}"></property>
            <property name="user" value="${jdbc.username}"></property>
            <property name="password" value="${jdbc.password}"></property>
        </bean>

        <!-- 配置和mybatis的整合  -->
        <!--第二步: 创建sqlSessionFactory工厂 -->
        <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
            <property name="dataSource" ref="dataSource"></property>
            <!-- 指定Mybatis全局配置文件的位置 -->
            <property name="configLocation" value="classpath:sqlConfig.xml"></property>
        </bean>

        <!-- 配置mybatis的代理接口开发 * 接口类名和映射文件必须同名 * 接口类和映射文件必须在同一个目     录下 * 接口的映射文件的namespace名称必须是接口的全限定名 
        * 接口的方法名必须和映射的statement的id一致 -->
        <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
            <!-- 扫描所有dao接口的实现，加入到ioc容器中  -->
            <property name="basePackage" value="com.ssm.mapper"></property>
            <property name="SqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
        </bean>

        <!--第三步: 事物 -->
        <bean id="txManager"
            class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
            <property name="dataSource" ref="dataSource"></property>
        </bean>

        <!-- 配置拦截service -->
        <aop:config>
            <aop:pointcut expression="execution(* com.ssm.service..*(..))" id="txPoint"/>
            <aop:advisor advice-ref="txAdvice" pointcut-ref="txPoint"/>
        </aop:config>

        <!-- 配置事物增强,事物如何切入-->
        <tx:advice id="txAdvice" transaction-manager="txManager">
            <tx:attributes>
                <!-- 所有方法都是事物方法 -->
                <tx:method name="*"/>
                <!-- 以get开始的所有方法 -->
                <tx:method name="get*" read-only="true"/>
            </tx:attributes>
        </tx:advice>

</beans>

5：mybatis配置文件
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
  PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
  "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>

    <!-- 别名设置 -->
    <typeAliases>
        <package name="com.ssm.model" />
    </typeAliases>

    <!-- mybatis分页插件 -->
    <plugins>
        <plugin interceptor="com.github.pagehelper.PageHelper"></plugin>
    </plugins>

</configuration>

6：log4j.properties
### set log levels ###  
log4j.rootLogger = INFO , console , debug , error  

### console ###  
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 = %-d{yyyy-MM-dd HH:mm:ss} [%p]-[%c] %m%n  

### log file ###  
log4j.appender.debug = org.apache.log4j.DailyRollingFileAppender  
log4j.appender.debug.File = ../logs/springmvc-demo.log  
log4j.appender.debug.Append = true  
log4j.appender.debug.Threshold = INFO  
log4j.appender.debug.layout = org.apache.log4j.PatternLayout  
log4j.appender.debug.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} [%p]-[%c] %m%n  

### exception ###  
log4j.appender.error = org.apache.log4j.DailyRollingFileAppender  
log4j.appender.error.File = ../logs/springmvc-demo_error.log  
log4j.appender.error.Append = true  
log4j.appender.error.Threshold = ERROR  
log4j.appender.error.layout = org.apache.log4j.PatternLayout  
log4j.appender.error.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} [%p]-[%c] %m%n  


###u9700u8981u58F0u660EuFF0Cu7136u540Eu4E0Bu65B9u624Du53EFu4EE5u4F7Fdruid sqlu8F93u51FAuFF0Cu5426u5219u4F1Au629Bu51FAlog4j.error.key not found  
log4j.appender.stdout=org.apache.log4j.ConsoleAppender  
log4j.appender.stdout.Target=System.out  
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout  
log4j.appender.stdout.layout.ConversionPattern=%d{ISO8601} %l %c%n%p: %m%n  

### druid sql ###  
log4j.logger.druid.sql=warn,stdout  
log4j.logger.druid.sql.DataSource=warn,stdout  
log4j.logger.druid.sql.Connection=warn,stdout  
log4j.logger.druid.sql.Statement=warn,stdout  
log4j.logger.druid.sql.ResultSet=warn,stdout  

7:springmvc.xml springmvc的配置文件
<?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:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
        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/aop
         http://www.springframework.org/schema/aop/spring-aop.xsd
         http://www.springframework.org/schema/context 
         http://www.springframework.org/schema/context/spring-context.xsd
         http://www.springframework.org/schema/tx
         http://www.springframework.org/schema/context/spring-tx.xsd
         http://www.springframework.org/schema/mvc
         http://www.springframework.org/schema/mvc/spring-mvc.xsd
        ">
        <!-- 扫描注解包  -->
       <context:component-scan base-package="com.ssm"></context:component-scan> 

        <!-- 配置sprigmvc视图解析器：解析逻辑试图 
             后台返回逻辑试图：index
            视图解析器解析出真正物理视图：前缀+逻辑试图+后缀====/WEB-INF/page/index.jsp-->
        <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/page/"></property>
        <property name="suffix" value=".jsp"></property>
        </bean>

        <!--1： mvc:annotation-driven默认创建了 RequestMappingHandlerMapping和  RequestMappingHandlerAdapter对象
        提供对JSon数据格式的支持-->
       <mvc:annotation-driven />
        <!-- 2.配置静态资源访问 -->
       <mvc:default-servlet-handler/>
 </beans>

8:jdbc.properties

jdbc.url = jdbc:mysql:///ssm
jdbc.driver = com.mysql.jdbc.Driver
jdbc.username= root
jdbc.password= root

9:web.xml


<?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" id="WebApp_ID" version="2.5">

  <display-name>ssmdemo</display-name>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>

   <!-- 加载Spring容器配置 -->
  <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>

   <!-- 配置SpringMVC核心控制器 -->
  <servlet>
    <servlet-name>dispatcherServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
     <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:springmvc.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <!-- 拦截所有请求 -->
  <servlet-mapping>
    <servlet-name>dispatcherServlet</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>

  <!-- 字符编码过滤器 -->
  <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>


</web-app>

10:建立service以及service实现【UserService.java】
package com.ssm.service;

import java.util.List;

import com.ssm.model.User;
/**
 * 描述:用户service
 * @version
 */
public interface UserService {

void saveUser(User user);

    boolean updateUser(User user);

    boolean deleteUser(int id);

    User findUserById(int id);

    List<User> findAll();
}

service实现类
package com.ssm.service.impl;

import java.util.List;

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

import com.ssm.mapper.UserMapper;
import com.ssm.model.User;
import com.ssm.service.UserService;
@Service
/**
 * 描述:用户service实现类
 * @version
 */
public class UserServiceImpl implements UserService {

    /**
     * 注入UserMapper接口
     */
    @Autowired
    private UserMapper userMapper;

    /**
     * 新增用户
     */
    @Override
    public void saveUser(User user) {
        userMapper.saveUser(user);
    }

    /**
     * 更新用户
     */
    @Override
    public boolean updateUser(User user) {
        return userMapper.updateUser(user);
    }

    /**
     * 根据Id删除用户
     */
    @Override
    public boolean deleteUser(int id) {
        return userMapper.deleteUser(id);
    }

    /**
     * 根据id查找用户
     */
    @Override
    public User findUserById(int id) {
        User user = userMapper.findUserById(id);
        return user;
    }

    /**
     * 查询所有用户
     */
    @Override
    public List<User> findAll() {
        List<User> allUser = userMapper.findAll();
        return allUser;
    }

}

11：建立controller
package com.ssm.controller;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import com.ssm.model.User;
import com.ssm.service.UserService;

@Controller
@RequestMapping("/user")
/**
 * 描述:用户controller
 * @version
 */
public class UserController {

    @Autowired
    private UserService userService;  

    /**
     *跳转到添加用户界面
     */
    @RequestMapping("toAddUser")
    public String toAddUser(){
        return "addUser";
    }

    /**
     * 添加用户并重定向  
     * @param model
     * @param user
     * @return
     */
    @RequestMapping("addUser") 
    public String addUser(Model model,User user){
        if(user != null){
            userService.saveUser(user);
        }
        return "redirect:/user/userInfo";
    }

    /**
     * 修改用户
     * @param model
     * @param request
     * @param user
     * @return
     */
    @RequestMapping("updateUser")  
    public String UpdateUser(Model model,User user){
             if(userService.updateUser(user)){  
                    user = userService.findUserById(user.getId());  
                    model.addAttribute("user", user);  
                    return "redirect:/user/userInfo";  
                } 
         return "/error";  
    }

    /**
     * 查询所有用户
     * @param request
     * @param model
     * @return
     */
    @RequestMapping("getAllUser")  
    public String getAllUser(Model model){
        List<User> user = userService.findAll();
        model.addAttribute("userList",user);
        return "allUser";
    }

    /**
     * 查询单个用户
     * @param id
     * @param request
     * @param model
     * @return
     */
    @RequestMapping("/getUser")  
    public String getUser(int id,Model model){
        model.addAttribute("user", userService.findUserById(id));  
        return "editUser";
    }
    /**
     * 根据id删除用户
     * @param id
     * @param request
     * @param response
     */
    @RequestMapping("/delUser") 
    public String deleteUser(int id,Model model){
        model.addAttribute("user", userService.deleteUser(id));  
        return "redirect:/user/userInfo";
    }

    /**
     * 分页查询用户信息
     * @param pn 默认从第一页开始  请求参数
     * @param model
     * @return
     */
    @RequestMapping("userInfo")
    public String getUsers(@RequestParam(value="pn",defaultValue="1")Integer pn,Model model){
        //从第一条开始 每页查询五条数据
        PageHelper.startPage(pn, 5);
        List<User> users = userService.findAll();
        //将用户信息放入PageInfo对象里
        PageInfo page = new PageInfo(users,5);
        model.addAttribute("pageInfo", page);
        return "allUser";
    }
}

 后端部分至此基本结束 ,下面就是前台页面

由于除了首页 其他页面都是放在WEB-INF下 所以我们通过首页来跳转一下
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%
    pageContext.setAttribute("path", request.getContextPath());
%>
<!DOCTYPE htm >
<html>
<head>
<title>首页</title>
<style type="text/css">
a {
    text-decoration: none;
    color: #fff;
    font-size: 14px;
}

h3 {
     180px;
    height: 38px;
    margin: 100px auto;
    text-align: center;
    line-height: 38px;
    background: #5BC0DE;
    border-radius: 4px;
}
</style>
</head>
<body>
    <h3>
        <a href="${path }/user/userInfo">进入用户管理页</a>
    </h3>
</body>
</html>

点击这里可以跳转到用户列表界面 
在页面引入bootstrap需要的文件 他提供的按钮样式 列表样式 分页导航等很方便，省的我们在去写前端的东西

用户列表界面
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%
    pageContext.setAttribute("path", request.getContextPath());
%>

<!DOCTYPE HTML>
<html>
<head>
<title>用户列表</title>
<link
    href="${path}/static/bootstrap-3.3.7-dist/css/bootstrap.min.css"
    rel="stylesheet">
<script type="text/javascript"
    src="${path}/static/bootstrap-3.3.7-dist/js/jquery-1.10.1.min.js"></script>
<script type="text/javascript"
    src="${path}/static/bootstrap-3.3.7-dist/js/bootstrap.min.js"></script>
</head>

<body>

    <div class="container">
        <!-- 标题 -->
        <div class="row">
            <div class="col-md-12">
                <h1>用户管理</h1>
            </div>
        </div>
        <!-- 按钮 -->
        <div class="row">
            <div class="col-md-4 col-md-offset-8">
                <a class="btn btn-primary" href="${path}/user/toAddUser">新增</a>
            </div>
        </div>
        <!-- 表格  -->
        <div class="row">
            <div class="col-md-12">
                <table class="table table-hover">
                    <tr>
                        <th>id</th>
                        <th>用户名</th>
                        <th>年龄</th>
                        <th>操作</th>
                    </tr>
                    <c:forEach items="${pageInfo.list }" var="user">
                        <tr>
                        <td>${user.id}</td>
                        <td>${user.username }</td>
                            <td>${user.age }</td>
                            <!-- <td><a  class="edit">编辑</a> <a
                                 class="delete">删除</a></td> -->
                            <td>
                                <a type="button"  href="${path}/user/getUser?id=${user.id}" class="btn btn-info btn-sm">
                                <span class="glyphicon glyphicon-pencil" aria-hidden="true"></span>
                                    编辑</a>
                                <a type="button"  href="${path}/user/delUser?id=${user.id}" class="btn btn-danger btn-sm">
                                <span class="glyphicon glyphicon-trash" aria-hidden="true" ></span>
                                    删除</a>
                            </td>
                        </tr>
                    </c:forEach>
                </table>
            </div>
        </div>

        <hr style="height:1px;border:none;border-top:1px solid #ccc;" />
        <!-- 分页导航栏 -->

        <!-- 分页信息 -->
        <div class="row">
            <!-- 分页文字信息，其中分页信息都封装在pageInfo中 -->
            <div class="col-md-6">
                当前第：${pageInfo.pageNum}页，总共：${pageInfo.pages}页，总共：${pageInfo.total}条记录
            </div>

        <!-- 分页条 -->
            <div class="col-md-6">
                <nav aria-label="Page navigation">
                  <ul class="pagination">
                    <li><a href="${path}/user/userInfo?pn=1">首页</a></li>
                    <c:if test="${pageInfo.hasPreviousPage }">
                         <li>
                          <a href="${path}/user/userInfo?pn=${pageInfo.pageNum-1}" aria-label="Previous">
                            <span aria-hidden="true">&laquo;</span>
                          </a>
                        </li>
                    </c:if>

                    <c:forEach items="${pageInfo.navigatepageNums }" var="page_Num">
                        <c:if test="${page_Num == pageInfo.pageNum }">
                            <li class="active"><a href="#">${ page_Num}</a></li>
                        </c:if>
                        <c:if test="${page_Num != pageInfo.pageNum }">
                            <li><a href="${path}/user/userInfo?pn=${ page_Num}">${ page_Num}</a></li>
                        </c:if>
                    </c:forEach> 
                    <c:if test="${pageInfo.hasNextPage }">
                        <li>
                          <a href="${path}/user/userInfo?pn=${pageInfo.pageNum+1}" aria-label="Next">
                            <span aria-hidden="true">&raquo;</span>
                          </a>
                        </li>
                    </c:if>   
                    <li><a href="${path}/user/userInfo?pn=${pageInfo.pages}">末页</a></li>
                  </ul>
                </nav>
            </div>
        </div>
    </div>
</body>
</html>

通过首页 就跳到了这里来 然后进行增删改查 
在引入mybatis分页插件的时候5.0 版本会出现找不到sqlSessionFactory的异常 4.2版本会报转换异常 郁闷 所以这里 如果你们也遇到了同样的问题 可以注意一下 

用户添加界面
为了省事 没必要引入bootstrap了 
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%  
    String path = request.getContextPath();  
    String basePath = request.getScheme() + "://"  
            + request.getServerName() + ":" + request.getServerPort()  
            + path + "/";  
%>  
<html>
<title>添加用户</title>
</head>
<body>
    <h1>添加用户</h1>
    <form action="" name="userForm">
        姓名：<input type="text" name="username"><br>
         年龄：<input type="text" name="age"><br>
          <input type="button" value="添加"
            onclick="addUser()">
    </form>

    <script type="text/javascript">
        function addUser() {
            var form = document.forms[0];
            form.action = "<%=basePath %>user/addUser";
            form.method = "post";
            form.submit();
        }
    </script>
</body>
</html>

修改界面
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%  
    String path = request.getContextPath();  
    String basePath = request.getScheme() + "://"  
            + request.getServerName() + ":" + request.getServerPort()  
            + path + "/";  
%>  
<!DOCTYPE html>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<html>
<head>
<title>编辑用户</title>

<script type="text/javascript">
    function updateUser() {
        var form = document.forms[0];
        form.action = "<%=basePath %>user/updateUser";
        form.method = "post";
        form.submit();
    }
</script>

</head>
<body>
    <h1>添加用户</h1>
    <form action="" name="userForm">
        <input type="hidden" name="id" value="${user.id }" /> 姓名：<input
            type="text" name="username" value="${user.username }" /> 年龄：<input
            type="text" name="age" value="${user.age }" /> <input type="button"
            value="编辑" onclick="updateUser()" />
    </form>
</body>

</html>

当然 删除点击一下就直接删除了，然后会回显到用户列表页面

最后就是数据库的建表语句 很简单了 我这里就贴上来 万一有小伙伴要照着我这个来一遍 可以直接复制粘贴过去就好了

DROP TABLE IF EXISTS `t_user`;  
CREATE TABLE `t_user` (  
  `user_id` int(11) NOT NULL AUTO_INCREMENT,  
  `user_name` varchar(20) NOT NULL,  
  `user_age` varchar(20) NOT NULL,  
  PRIMARY KEY (`user_id`)  
) ENGINE=InnoDB AUTO_INCREMENT=10 DEFAULT CHARSET=utf8;  

我的maven自己另外设置了一下，有的时候maven工程会毛病多多，老是出现找不到jar包的问题 
找到c盘这里来 

在进去 

<!-- 阿里云中央仓库-->
在setting.xml中我配置的是阿里云的中央仓库 跟着视频来的
  <mirrors>
     <mirror>
         <id>alimaven</id>
         <name>aliyun maven</name>
         <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
         <mirrorOf>central</mirrorOf>
     </mirror>
  </mirrors>

<!-- 设置jdk编译版本-->
    <profile>
        <id>jdk1.7</id>
        <activation>
            <activeByDefault>true</activeByDefault>
            <jdk>1.7</jdk>
        </activation>
        <properties>
            <maven.compiler.source>1.7</maven.compiler.source>
            <maven.compiler.target>1.7</maven.compiler.target>
            <maven.compiler.compilerVersion>1.7</maven.compiler.compilerVersion>
        </properties>
    </profile>