SSM框架下实现简单增删查改的具体细节（代码）

UserInfo

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 + '\'' +
                '}';
    }
}

UserController

package com.zhongruan.controller;

import com.zhongruan.bean.UserInfo;
import com.zhongruan.service.IUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import java.util.List;

@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 toAddUser(){
    //List<UserInfo> userInfos= userService.findALL();
    ModelAndView mv =new ModelAndView();
    mv.addObject("ui");
    mv.setViewName("addUser");
    return mv;
}

@RequestMapping("/save.do")
public String save(UserInfo userInfo)
{
    userService.save(userInfo);
    return "redirect:/user/findAll.do";

}

@RequestMapping("/delete.do")
    public String delete(int id)
    {
        userService.delete(id);
        return "redirect:/user/findAll.do";
    }


    @RequestMapping("toUpdate.do")
    public String toUpdate(Model model, int id){
        model.addAttribute("userInfo",userService.queryById(id));
        return "updateUser";
    }

    @RequestMapping("update.do")
    public String update(UserInfo userInfo){
        userService.updateUser(userInfo);
        return "redirect:/user/findAll.do";
    }

}

IUserDao

import com.zhongruan.bean.UserInfo;

import java.util.List;

public interface IUserDao {
    List<UserInfo> findALL();
    boolean save(UserInfo userInfo);

    boolean delete(int id);
    boolean updateUser(UserInfo userInfo);

    UserInfo queryById(int id);



}

UserServiceImpl

import com.zhongruan.bean.UserInfo;
import com.zhongruan.dao.IUserDao;
import com.zhongruan.service.IUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class UserServiceImpl implements IUserService {

    @Autowired
    IUserDao userDao;

    @Override
    public List<UserInfo> findALL() {
        return userDao.findALL();
    }


    public boolean save(UserInfo userInfo) {
        return userDao.save(userInfo);
    }

    @Override
    public boolean delete(int id){
        return  userDao.delete(id);
    }

    @Override
    public boolean updateUser(UserInfo userInfo) {
        return userDao.updateUser(userInfo);
    }

    @Override
    public UserInfo queryById(int id) {
        return userDao.queryById(id);
    }


}

IUserService

package com.zhongruan.service;

import com.zhongruan.bean.UserInfo;

        import java.util.List;

public interface IUserService {
    List<UserInfo> findALL();
    boolean save(UserInfo userInfo);

    boolean delete(int id);
    boolean updateUser(UserInfo userInfo);

    UserInfo queryById(int id);
}

UserMapper

<?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>

    <insert id="save" parameterType="com.zhongruan.bean.UserInfo">
        INSERT INTO userinfo(id,username,password) VALUE (#{id},#{username}, #{password})
    </insert>

    <delete id="delete" parameterType="UserInfo">
        DELETE FROM userinfo WHERE id=#{id}
    </delete>

    <update id="updateUser" parameterType="UserInfo">
        UPDATE userinfo SET username=#{username},password=#{password} where id=#{id}
    </update>

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

</mapper>

Index

<%@ 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>

allUser

<%@ 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>

addUser

<%@ 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>

updateUser

<%@ 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>

结果