SSM中实现CRUD并配置输出sql语句

曾经终败给现在 2023-10-18 12:53 33阅读 0赞

## 场景 ##

前面SSM的项目整合以及分页等参照

[https://blog.csdn.net/BADAO\_LIUMANG\_QIZHI/article/details/85120936][https_blog.csdn.net_BADAO_LIUMANG_QIZHI_article_details_85120936]

使用log4j输出sql语句参照:

[https://blog.csdn.net/BADAO\_LIUMANG\_QIZHI/article/details/85159383][https_blog.csdn.net_BADAO_LIUMANG_QIZHI_article_details_85159383]

### 项目目录结构 ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70][]![Image 1][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 1][]

### 源码下载 ###

[https://download.csdn.net/download/badao\_liumang\_qizhi/10867006][https_download.csdn.net_download_badao_liumang_qizhi_10867006]

## 实现 ##

### jsp页面 ###

#### listUser.jsp ####

打开listUser.jsp,添加编辑以及删除按钮，以及添加的表单。

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
     
    <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
    
    <%
     pageContext.setAttribute("APP_PATH", request.getContextPath());
    %>
    <!DOCTYPE html>
    <html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <title>查询所有用户</title>
    </head>
    
    <script type="text/javascript" src="${APP_PATH }/static/js/jquery-1.12.4.min.js"></script>
    <link href="${APP_PATH }/static/bootstrap-3.3.7-dist/css/bootstrap.min.css" rel="stylesheet">
    <script src="${APP_PATH }/static/bootstrap-3.3.7-dist/js/bootstrap.min.js"></script>
    <body>
    <table align='center' border='1' cellspacing='0' class="table table-bordered"
        <th >
            <td>id</td>
            <td>name</td>
            <td>age</td>
            <td>编辑</td>
            <td>删除</td>
        </th>
        <c:forEach items="${userList}" var="u">
            <tr class="active">
                <td >${u.id}</td>
                <td>${u.name}</td>
                <td>${u.age}</td>
                <td><a href="editUser?id=${u.id}">编辑</a></td>
    	        <td><a href="deleteUser?id=${u.id}">删除</a></td>
            </tr>
        </c:forEach>
    </table>
    <div style="text-align:center">
            <a href="?start=0">首  页</a>
            <a href="?start=${page.start-page.count}">上一页</a>
            <a href="?start=${page.start+page.count}">下一页</a>
            <a href="?start=${page.last}">末  页</a>
    </div>
    <form action="addUser" method="post">
      <div class="form-group">
        <label for="name">用户名</label>
        <input type="text" class="form-control" id="name" name ="name" placeholder="name">
      </div>
      <div class="form-group">
        <label for="age">年龄</label>
        <input type="number" class="form-control" id="age"  name="age" placeholder="age">
      </div>
      <button type="submit" class="btn btn-default">新增用户</button>
    </form>
    
    </body>
    </html>

#### editUser.jsp ####

<%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8" import="java.util.*"%>
     
    <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
     
     <div style="width:500px;margin:0px auto;text-align:center">
    	
    	
    	<div style="text-align:center;margin-top:40px">
    		
    		<form method="post" action="updateUser">
    			用户名称： <input name="name" value="${user.name}" type="text"> <br><br>
    			用户年龄： <input name="age" value="${user.age}" type="text"> <br><br>
    			<input type="hidden" value="${user.id}" name="id">
    			<input type="submit" value="编辑用户">
    		</form>
    
    	</div>	
     </div>

点击新增或者编辑或者删除时都会跳转到后台Controller

### 配置Controller ###

打开userController

package com.badao.controller;
    
    import java.util.List;
    
    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.badao.pojo.User;
    import com.badao.service.UserService;
    import com.badao.util.Page;
    import com.github.pagehelper.PageHelper;
    import com.github.pagehelper.PageInfo;
    
    
    
    
    // 告诉spring mvc这是一个控制器类
    @Controller
    @RequestMapping("")
    public class UserController {
     @Autowired
     UserService userService;
    
     @RequestMapping("listUser")
     public ModelAndView listUser(Page page){
      ModelAndView mav = new ModelAndView();
      //根据分页对象，进行查询获取查询对象集合
      //List<User> cs= userService.selectAllUser(page);
      //int total = userService.total();
      //根据总数，计算最后一页的信息
      
       PageHelper.offsetPage(page.getStart(),5);
          List<User> cs= userService.selectAllUser();
          int total = (int) new PageInfo<>(cs).getTotal();
          page.caculateLast(total);
      // 放入转发参数
      mav.addObject("userList", cs);
      // 放入jsp路径
      mav.setViewName("listUser");
      return mav;
     }
      
     @RequestMapping("addUser")
     public ModelAndView addUser(User user){
      System.out.println(user.getName());
      userService.addUser(user);
      ModelAndView mav = new ModelAndView("redirect:/listUser");
         return mav;
     } 
     @RequestMapping("deleteUser")
     public ModelAndView deleteUser(int id){
      userService.deleteUser(id);
      ModelAndView mav = new ModelAndView("redirect:/listUser");
      return mav;
     } 
     @RequestMapping("editUser")
     public ModelAndView editUser(User user){
         user= userService.selectUser(user.getId());
      ModelAndView mav = new ModelAndView("editUser");
      mav.addObject("user", user);
      return mav;
     } 
     @RequestMapping("updateUser")
     public ModelAndView updateUser(User user){
      userService.updateUser(user);
      ModelAndView mav = new ModelAndView("redirect:/listUser");
      return mav;
     } 
    
    }

controller调用service方法

### 配置service ###

package com.badao.service;
    
    import java.util.List;
    
    import com.badao.pojo.User;
    import com.badao.util.Page;
    
    public interface UserService {
     List<User> selectAllUser();
    
     User selectUser(Integer id);
    
     void updateUser(User user);
    
     void deleteUser(int id);
    
     void addUser(User user);
     
     //List<User> selectAllUser(Page page);
     //int total();
    
    }

### 配置serviceImpl ###

package com.badao.service.impl;
    
    import java.util.List;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
    
    import com.badao.mapper.UserMapper;
    import com.badao.pojo.User;
    import com.badao.service.UserService;
    import com.badao.util.Page;
    @Service
    public class UserServiceImpl implements UserService {
    
     @Autowired
     UserMapper userMapper;
     public List<User> selectAllUser() {
      // TODO Auto-generated method stub
      return userMapper.selectAllUser();
     }
    /* @Override
     public List<User> selectAllUser(Page page) {
      // TODO Auto-generated method stub
      return userMapper.selectAllUser(page);
     }
     @Override
     public int total() {
      // TODO Auto-generated method stub
      return userMapper.total();
     }*/
     @Override
     public User selectUser(Integer id) {
      // TODO Auto-generated method stub
      return userMapper.selectUser(id);
     }
     @Override
     public void updateUser(User user) {
      // TODO Auto-generated method stub
          userMapper.updateUser(user);
     }
     @Override
     public void deleteUser(int id) {
      // TODO Auto-generated method stub
      userMapper.deleteUser(id);
     }
     @Override
     public void addUser(User user) {
      // TODO Auto-generated method stub
      userMapper.addUser(user);
     }
    
    }

### 配置mapper ###

打开mapper下的usermapper.java

package com.badao.mapper;
    
    import java.util.List;
    import com.badao.pojo.User;
    import com.badao.util.Page;
    
    
    
    public interface UserMapper {
     public int addUser(User user);
     public User selectUser(int id);
     public int updateUser(User user);
     public void deleteUser(int id);
     public List<User> selectAllUser();
     //public List<User> selectAllUser(Page page);
     //public int total();
     
    }
    
    打开mapper下的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.badao.mapper.UserMapper">
            <insert id="addUser" parameterType="User" >
                insert into user ( name,age ) values (#{name},#{age})  
            </insert>
            
            <delete id="deleteUser" parameterType="_int" >
                delete from user where id= #{id} 
            </delete>
            
            <select id="selectUser" parameterType="_int" resultType="User">
                select * from   user  where id= #{id}  
            </select>
     
            <update id="updateUser" parameterType="User" >
                updateusersetname=#{name},age=#{age} where id=#{id}  
            </update>
            <select id="selectAllUser" resultType="User">
                select * from   user    
               
            </select>
            
        </mapper>

### 配置POJO ###

package com.badao.pojo;
    
    
    public class User {
     private Integer id;
     private String name;
     private Integer age;
     public Integer getId() {
      return id;
     }
     public void setId(Integer id) {
      this.id = id;
     }
     public String getName() {
      return name;
     }
     public void setName(String name) {
      this.name = name;
     }
     public Integer getAge() {
      return age;
     }
     public void setAge(Integer age) {
      this.age = age;
     }
    
    
    }

### 配置web.xml ###

加入编码过滤器

<filter>
         <filter-name>encodingFilter</filter-name>
         <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
         <init-param>
             <param-name>encoding</param-name>
             <param-value>UTF-8</param-value>
         </init-param>
         <init-param>
             <param-name>forceEncoding</param-name>
             <param-value>true</param-value>
         </init-param>
     </filter>
     <filter-mapping>
         <filter-name>encodingFilter</filter-name>
         <url-pattern>/*</url-pattern>
     </filter-mapping>

完整web.xml代码

<?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"
             xmlns:web="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">
     <filter>
         <filter-name>encodingFilter</filter-name>
         <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
         <init-param>
             <param-name>encoding</param-name>
             <param-value>UTF-8</param-value>
         </init-param>
         <init-param>
             <param-name>forceEncoding</param-name>
             <param-value>true</param-value>
         </init-param>
     </filter>
     <filter-mapping>
         <filter-name>encodingFilter</filter-name>
         <url-pattern>/*</url-pattern>
     </filter-mapping>
     
     <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>
     
     
     
     <servlet>
      <servlet-name>mvc-dispatcher</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>
     <servlet-mapping>
      <servlet-name>mvc-dispatcher</servlet-name>
      <url-pattern>/</url-pattern>
     </servlet-mapping>
     
    </web-app>

## 运行 ##

将源码下载下来，或者自己搭建项目，部署到Tomcat吗，启动服务器。

打开浏览器输入:

[http://localhost:8080/ssmJarTemplate/listUser][http_localhost_8080_ssmJarTemplate_listUser]

### 效果 ###

![Image 1][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 2][]

###     ###

[https_blog.csdn.net_BADAO_LIUMANG_QIZHI_article_details_85120936]: https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/85120936
[https_blog.csdn.net_BADAO_LIUMANG_QIZHI_article_details_85159383]: https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/85159383
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20181221140040923.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk=,size_16,color_FFFFFF,t_70
[Image 1]: 
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20181221140044572.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk=,size_16,color_FFFFFF,t_70
[https_download.csdn.net_download_badao_liumang_qizhi_10867006]: https://download.csdn.net/download/badao_liumang_qizhi/10867006
[http_localhost_8080_ssmJarTemplate_listUser]: http://localhost:8080/ssmJarTemplate/listUser
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20181221144624338.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk=,size_16,color_FFFFFF,t_70