增删改查的SSM小项目

 　  经过将近一个月的摸索，终于算是勉强完成了关于增删改查的SSM项目。

　　github源码地址：https://github.com/123456abcdefg/Login

　　好了，话不多说，写一下具体代码。

　　

 实现代码：

 1.controller:

登录：

package com.controller;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
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.servlet.ModelAndView;
import com.entity.user;
import com.service.userService;

@Controller
@RequestMapping("/admin")

public class userController {
  // 注入UserService
  @Autowired
  private userService userService;

  @RequestMapping("/index")
  public String index(){
    return "index";
  }
  
  // 登录
  @RequestMapping("/login")
  public String login(HttpServletRequest request,String username,String password){
    user user =userService.getUser(username,password);
    ModelAndView modelandview = new ModelAndView();
    modelandview.addObject(user);
    if(user.getIdent().equals("1"))
      return "redirect:/admin/user/userlist.action";
    else
      return "redirect:/admin/index.action";
  }

  @RequestMapping("/error")
  public String error(){
    return "error";
  }
}

userlistController：

package com.controller;
import java.util.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
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.servlet.ModelAndView;
import com.entity.user;
import com.service.userService;

@Controller
@RequestMapping("/admin/user")

public class userlistController {
  // 注入UserService
  @Autowired
  private userService userService;
  
  @RequestMapping("/userlist")
  public ModelAndView userlist(HttpServletRequest request,Integer search){
    user user = new user();
    user.setId(search);
    List<user> userlist = userService.findUserList(user);
    ModelAndView modelandview = new ModelAndView();
    modelandview.addObject("userlist",userlist);
    modelandview.setViewName("login");
    return modelandview;
  }
      
  //新增页面
  @RequestMapping("/add")
  public String add(HttpServletRequest request){
    return "add_do"; 
  }

  //增加用户
  @RequestMapping("/add_do")
  public String add_do(HttpServletRequest request,
    String username,String password,String ident){
    user user = new user();
    user.setUsername(username);
    user.setPassword(password);
    user.setIdent(ident);
    userService.addUser(user);
    return  "forward:userlist.action";
  }
      
  //删除用户
  @RequestMapping("/delete_do")
  public String delete_do(HttpServletRequest request,Integer id){
    userService.deleteUser(id);
    return  "forward:userlist.action";
  }
      
  //修改页面
  @RequestMapping("/update")
  public ModelAndView update(Integer id){
    ModelAndView modelandview = new ModelAndView();
    user user=userService.getUserById(id);
    modelandview.addObject(user);
    modelandview.setViewName("add_do");
    return modelandview;
  }
  
  //修改用户信息
  @RequestMapping("/update_do")
  public String update_do(HttpServletRequest request,Integer id,String username,String password,String ident){
    user user = new user();
    user.setId(id);
    user.setUsername(username);
    user.setPassword(password);
    user.setIdent(ident);
    userService.updateUser(user);
    return  "forward:userlist.action";
  }
}

2.user:

package com.entity;
import java.util.List;

public class user {
  private Integer id;
  private String username;
  private String password;
  private String ident;
  
  public String getIdent() {
    return ident;
  }
  public void setIdent(String ident) {
    this.ident = ident;
  }
  public Integer getId() {
    return id;
  }
  public void setId(Integer 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;
  }
}

3.mapper:

package com.mapper;
import java.util.List;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
import com.entity.user;

public interface userMapper {
  public user getUser(String username,String password);
  public List<user> findUserList(user user);
  public void addUser(user user);
  public void deleteUser(Integer id);
  public user getUserById(Integer id);
  public void updateUser(user user);
}

 mapper.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.mapper.userMapper">
  <resultMap type="com.entity.user" id="userMapper">
    <id column="id" property="id" jdbcType="INTEGER"  />
    <result column="username" property="username" jdbcType="VARCHAR"/>
    <result column="password" property="password" jdbcType="VARCHAR"/>
    <result column="ident" property="ident" jdbcType="VARCHAR"/>
  </resultMap>
  
  <select id="getUser" parameterType="com.entity.user" resultType="com.entity.user">
    select * 
    from user 
    where username=#{0} and password=#{1}
  </select>
  
  <select id="findUserList" parameterType="com.entity.user" resultType="com.entity.user">
    select * 
    from user
    where 1=1 and id like '%${id}%'
  </select>
  
  <insert id="addUser" parameterType="com.entity.user">
  insert into user
    <trim prefix="(" suffix=")" suffixOverrides=",">
      <if test="id != null">
        id,
      </if>
      <if test="username != null">
        username,
      </if>
      <if test="password != null">
        password,
      </if>
      <if test="ident != null">
        ident,
      </if>
    </trim>
    <trim prefix="values (" suffix=")" suffixOverrides=",">
      <if test="id != null">
        #{id,jdbcType=INTEGER},
      </if>
      <if test="username != null">
        #{username,jdbcType=VARCHAR},
      </if>
      <if test="password != null">
        #{password,jdbcType=VARCHAR},
      </if>
      <if test="ident != null">
        #{ident,jdbcType=VARCHAR},
      </if>
    </trim>
  </insert>
  
  <delete id="deleteUser" parameterType="com.entity.user">
    delete 
    from user
    where id=#{id,jdbcType=INTEGER}
  </delete>
  
  <select id="getUserById" parameterType="com.entity.user" resultType="com.entity.user">
    select *
    from user
    where id=#{id}
  </select>
  
  <update id="updateUser" parameterType="com.entity.user">
    update user
    <set>
      <if test="username != null">
        username = #{username,jdbcType=VARCHAR},
      </if>
      <if test="password != null">
        password = #{password,jdbcType=VARCHAR},
      </if>
      <if test="ident != null">
        ident = #{ident,jdbcType=VARCHAR},
      </if>
    </set>
    where id = #{id,jdbcType=INTEGER}
  </update>
  
</mapper>

4.service:

userService：

package com.service;
import java.util.List;
import com.entity.user;

public interface userService {
  public user getUser(String username,String password);
  public List<user> findUserList(user user);
  public void addUser(user user);
  public void deleteUser(Integer id);
  public user getUserById(Integer id);
  public void updateUser(user user);
}

userServiceimp：

package com.service;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import com.entity.user;
import com.mapper.userMapper;

public class userServiceimp implements userService{
  // 注入User
  @Autowired
  private userMapper usermapper;

  @Override
  public user getUser(String username,String password){
    return usermapper.getUser(username,password);
  }
  
  @Override
  public List<user> findUserList(user user){
    return usermapper.findUserList(user);
  }
  
  @Override
  public void addUser(user user){
    usermapper.addUser(user); 
  }
  
  @Override
  public void deleteUser(Integer id){
    usermapper.deleteUser(id);
  }
  
  @Override
  public user getUserById(Integer id){
    return usermapper.getUserById(id);
  }
  
  @Override
  public void updateUser(user user){
    usermapper.updateUser(user);
  } 
}

剩下的配置文件我就不粘了，大家可以去我github上下载源码查看。

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大致就是这样了，实现了基本的增删改查操作，以后要是写出好的项目也会同样放在github上，欢迎大家下载讨论。

项目就先告一段落了，接下来的任务就是把SSM从头到尾看一遍，彻底搞懂SSM框架具体怎么实现。