SSM 实现登录注册功能

1.上一篇SSM框架搭建好了之后就要开始写功能了，现在来写一个简单的登录注册功能

这几个包是自己手动创建的，然后往里面写代码

2.代码详情

package com.maike.controller;

import javax.servlet.http.HttpServletRequest;

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.maike.dto.UserDto;
import com.maike.model.User;
import com.maike.service.UserService;
/**
 * 
 * @author tan
 *
 */
@Controller
@RequestMapping("/user")
public class UserController {
    @Autowired
    private UserService userService;
    
    /**
     * toRegister: 跳转到注册页面<br/>
     * @return
     */
    @RequestMapping("/toRegister")
    public String toRegister(){
        return "register";
    }
    /**
     * addUser:实现注册 <br/>
     * @param userDto
     * @return
     */
    @RequestMapping("/addUser")
    public ModelAndView addUser(UserDto userDto) {
        int k = userService.addUser(userDto);
        if(k > 0) {
            ModelAndView view = new ModelAndView("login");
            return view;
        }else {
            ModelAndView view = new ModelAndView("register");
            return view;
        }
    }
    /**
     * 登录判断
     * @param userDto
     * @return
     */
    @RequestMapping("/judgeLogin")
    public ModelAndView judgeLogin(UserDto userDto) {
        int k = userService.judgeLogin(userDto);
        if(k > 0) {
            ModelAndView view = new ModelAndView("success");
            return view;
        }else {
            ModelAndView view = new ModelAndView("login");
            return view;
        }
    }
    

}

package com.maike.dto;

import java.io.Serializable;

public class UserDto implements Serializable {

    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    
    private String userName;
    
    private String userPwd;
    
    private String reUserPwd;

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getUserPwd() {
        return userPwd;
    }

    public void setUserPwd(String userPwd) {
        this.userPwd = userPwd;
    }

    public String getReUserPwd() {
        return reUserPwd;
    }

    public void setReUserPwd(String reUserPwd) {
        this.reUserPwd = reUserPwd;
    }

    public static long getSerialversionuid() {
        return serialVersionUID;
    }

    @Override
    public String toString() {
        return "UserDto [userName=" + userName + ", userPwd=" + userPwd + ", reUserPwd=" + reUserPwd + "]";
    }

}

UserMapper.xml

 <!-- 通过用户名查询用户 -->
  <select id="selectByName" parameterType="java.lang.String" resultMap="BaseResultMap">
      SELECT 
      <include refid="Base_Column_List" />
      FROM user WHERE user_name=#{userName,jdbcType=VARCHAR}
  </select>
  <!--  通过用户名密码查询 -->
  <select id="selectByNamePwd" parameterType="java.lang.String" resultMap="BaseResultMap">
    select 
    <include refid="Base_Column_List" />
    from user
    where user_name=#{userName,jdbcType=VARCHAR} and user_pwd=#{userPwd,jdbcType=VARCHAR}
  </select>
  <!--  添加用户信息 -->
  <insert id="insert" parameterType="com.maike.model.User">
      INSERT INTO user(user_id, user_name, user_pwd) values(#{userId,jdbcType=INTEGER}, #{userName,jdbcType=VARCHAR}, #{userPwd,jdbcType=VARCHAR})
  </insert>

UserMapper.java

    int insert(User user);

    User selectByName(String userName);
    
    User selectByNamePwd(@Param("userName") String userName,@Param("userPwd") String userPwd);

package com.maike.service;

import com.maike.dto.UserDto;

public interface UserService {
    
    int addUser(UserDto userDto);
    
    int judgeLogin(UserDto userDto);

}

package com.maike.serviceImpl;

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

import com.maike.dao.UserMapper;
import com.maike.dto.UserDto;
import com.maike.model.User;
import com.maike.service.UserService;
@Service
public class UserServiceImpl implements UserService {
    @Autowired
    private UserMapper userMapper;

    /**
     * addUser: 添加用户<br/>
     */
    public int addUser(UserDto userDto) {
        // TODO Auto-generated method stub
        int k = 0;
        String userName = userDto.getUserName();
        String userPwd = userDto.getUserPwd();
        String reUserPwd = userDto.getReUserPwd();
        if("" == userName || "" == userPwd|| "" == reUserPwd) {
            return k;
        }
        if(!userPwd.equals(reUserPwd)) {
            return k;
        }
        User u = userMapper.selectByName(userName);
        if(null != u) {
            return k;
        }
        User user = new User();
        user.setUserName(userName);
        user.setUserPwd(reUserPwd);
        k = userMapper.insert(user);
        return k;
    }

    /**
     * 登录判断
     */
    public int judgeLogin(UserDto userDto) {
        // TODO Auto-generated method stub
        int k = 0;
        String userName = userDto.getUserName();
        String userPwd = userDto.getUserPwd();
        if("" == userName || "" == userPwd) {
            return 0;
        }
        User user = userMapper.selectByNamePwd(userName, userPwd);
        if(null != user) {
            k = 1;
            return k;
        }
        return 0;
    }

}

JSP

<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>注册页面</title>
</head>
<body>
  <br/>
  <br/>
  <br/>
    <form action="addUser">
       <table align = "center" >
           <tr>
               <td>用户名</td><td><input type = "text" name = "userName"></td>
           </tr>
           <tr>
               <td>密码</td><td><input type = "password" name = "userPwd"></td>
           </tr>
           <tr>
               <td>确认密码</td><td><input type = "password" name = "reUserPwd"></td>
           </tr>
           <tr>
               <td colspan="2" align = "center"><input type = "submit" value = "注册" style = "background-color: Cyan;color:blue"></td>
           </tr>
       </table>
    </form>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>登录页面</title>
</head>
<body>
  <br/>
  <br/>
  <br/>
    <form action="user/judgeLogin">
       <table align = "center">
           <tr>
               <td>用户名</td><td><input type = "text" name = "userName"></td>
           </tr>
           <tr>
               <td>密码</td><td><input type = "password" name = "userPwd"></td>
           </tr>
           <tr>
               <td align = "left"><input type = "submit" value = "登录" style = "background-color: Cyan;color:blue"></td>
               <td align = "right" ><button style = "background-color: Cyan;color:blue"><a href = "/SSM/user/toRegister">注册</a></button></td>
           </tr>
       </table>
    </form>
</body>
</html>

 3.最好部署到Tomcat上 运行成功