ssm简单登录流程

这个就是流程，为了方便我接下来贴代码，把这一部分单独截下来了，上面那篇文章里面也有登录注册的代码。

1、首先是数据库，我数据库就一个user表，只有name和password两个字段，这里就不贴代码了。

2、接着是entity

1.  
   package com.jiang.entity;
2.  
    
3.  
   public class User {
4.  
   private String name;
5.  
   private String password;
6.  
   public String getName() {
7.  
   return name;
8.  
   }
9.  
   public void setName(String name) {
10.  
    this.name = name;
11.  
    }
12.  
    public String getPassword() {
13.  
    return password;
14.  
    }
15.  
    public void setPassword(String password) {
16.  
    this.password = password;
17.  
    }
18.  
     
19.  
     
20.  
    }

这个也是跟user表一样的，其实也没啥

3、UserMapper.xml

1.  
   <?xml version="1.0" encoding="UTF-8"?>
2.  
   <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
3.  
   "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
4.  
   <mapper namespace="com.jiang.mapper.UserMapper">
5.  
   <resultMap type="com.jiang.entity.User" id="userRM">
6.  
   <result property="name" column="name"/>
7.  
   <result property="password" column="password"/>
8.  
   </resultMap>
9.  
   <select id="selectByName" parameterType="map" resultMap="userRM">
10.  
    select * from user where
11.  
    <if test="name!=null">name=#{name}</if>
12.  
    <if test="password!=null">and password=#{password}</if>
13.  
    </select>
14.  
    </mapper>

4、接下来应该是mapper.java但是我用了spring整合，所以这里就没有，但是在spring的配置文件中一定要配置包扫描文件，而且这个路径很重要，一定不能搞错了

5、然后就是Dao层，Dao可以分成Dao和DaoImpl两个包，我这里是分开写的，所以我会把代码分别贴出来

BaseDao.java（这个类是因为之前按照书上来的，所以建了，之后也没删除，这里可以忽略）

1.  
   package com.jiang.dao;
2.  
    
3.  
   import java.io.Serializable;
4.  
   import java.util.List;
5.  
   import java.util.Map;
6.  
    
7.  
   public interface BaseDao<T> {
8.  
    
9.  
   }

UserDao.java

1.  
   package com.jiang.dao;
2.  
    
3.  
   import java.util.List;
4.  
   import java.util.Map;
5.  
    
6.  
   import com.jiang.entity.User;
7.  
    
8.  
   public interface UserDao extends BaseDao<User>{
9.  
   public boolean findUserByName(Map map);
10.  
     
11.  
    }

BaseDaoImpl.java

1.  
   package com.jiang.dao.impl;
2.  
    
3.  
   import org.apache.ibatis.session.SqlSessionFactory;
4.  
   import org.mybatis.spring.support.SqlSessionDaoSupport;
5.  
   import org.springframework.beans.factory.annotation.Autowired;
6.  
   import com.jiang.dao.BaseDao;
7.  
    
8.  
   public abstract class BaseDaoImpl<T> extends SqlSessionDaoSupport implements BaseDao<T>{
9.  
   @Autowired
10.  
    public void setSqlSessionFactory(SqlSessionFactory sqlSessionFactory) {
11.  
    super.setSqlSessionFactory(sqlSessionFactory);
12.  
    }
13.  
     
14.  
    }

这里继承了SqlSessionDaoSupport类，这个类是会话工厂的数据库连接层辅助类，通过为其注入sqlSessionFactory对象就可以直接调用getSqlSession方法获取会话对象并进行增删改查操作。

UserDaoImpl.java

1.  
   package com.jiang.dao.impl;
2.  
    
3.  
   import java.util.List;
4.  
   import java.util.Map;
5.  
    
6.  
   import org.springframework.beans.factory.annotation.Autowired;
7.  
   import org.springframework.stereotype.Repository;
8.  
    
9.  
   import com.jiang.dao.UserDao;
10.  
    import com.jiang.entity.User;
11.  
     
12.  
    @Repository
13.  
    public class UserDaoImpl extends BaseDaoImpl<User> implements UserDao{
14.  
     
15.  
    public boolean findUserByName(Map map) {
16.  
    // TODO Auto-generated method stub
17.  
    if(map!=null) {
18.  
    List<User> u=getSqlSession().selectList("com.jiang.mapper.UserMapper.selectByName", map);
19.  
    if(!u.isEmpty()) {
20.  
    return true;
21.  
    }else {
22.  
    return false;
23.  
    }
24.  
    }else {
25.  
    return false;
26.  
    }
27.  
    }
28.  
     
29.  
    }

6、service层，这里也是接口和实现类分开的

UserService.java

1.  
   package com.jiang.service;
2.  
    
3.  
   import java.io.Serializable;
4.  
   import java.util.List;
5.  
   import java.util.Map;
6.  
    
7.  
   import com.jiang.entity.User;
8.  
    
9.  
   public interface UserService {
10.  
    public boolean findUserByName(Map map);
11.  
     
12.  
    }

UserServiceImpl.java

1.  
   package com.jiang.service.impl;
2.  
    
3.  
   import java.io.Serializable;
4.  
   import java.util.List;
5.  
   import java.util.Map;
6.  
    
7.  
   import org.springframework.beans.factory.annotation.Autowired;
8.  
   import org.springframework.stereotype.Service;
9.  
    
10.  
    import com.jiang.dao.UserDao;
11.  
    import com.jiang.entity.User;
12.  
    import com.jiang.service.UserService;
13.  
     
14.  
    @Service
15.  
    public class UserServiceImpl implements UserService{
16.  
    @Autowired
17.  
    private UserDao userDao;
18.  
     
19.  
    public boolean findUserByName(Map map) {
20.  
    // TODO Auto-generated method stub
21.  
    return userDao.findUserByName(map);
22.  
    }
23.  
     
24.  
     
25.  
     
26.  
     
27.  
    }

7、controller层，同样还是接口和实现类分开

BaseController.java

1.  
   package com.jiang.controller;
2.  
    
3.  
   import java.text.DateFormat;
4.  
   import java.text.SimpleDateFormat;
5.  
   import java.util.Date;
6.  
    
7.  
   import org.springframework.beans.propertyeditors.CustomDateEditor;
8.  
   import org.springframework.web.bind.WebDataBinder;
9.  
   import org.springframework.web.bind.annotation.InitBinder;
10.  
     
11.  
    public abstract class BaseController {
12.  
    @InitBinder
13.  
    public void initBinder(WebDataBinder binder) {
14.  
    DateFormat dateFormat =new SimpleDateFormat("yyyy-MM-dd");
15.  
    dateFormat.setLenient(true);
16.  
    binder.registerCustomEditor(Date.class, new CustomDateEditor(dateFormat,true));
17.  
    }
18.  
     
19.  
    }

这里面的方法用于日期的转换，如果页面里的日期格式转换错误会报400错误

UserController.java

1.  
   package com.jiang.controller;
2.  
    
3.  
   import java.util.HashMap;
4.  
   import java.util.Map;
5.  
    
6.  
   import javax.servlet.http.HttpServletRequest;
7.  
    
8.  
   import org.springframework.beans.factory.annotation.Autowired;
9.  
   import org.springframework.stereotype.Controller;
10.  
    import org.springframework.ui.Model;
11.  
    import org.springframework.web.bind.annotation.RequestMapping;
12.  
     
13.  
    import com.jiang.entity.User;
14.  
    import com.jiang.service.UserService;
15.  
     
16.  
    @Controller
17.  
    public class UserController extends BaseController{
18.  
    @Autowired
19.  
    UserService userService;
20.  
     
21.  
    @RequestMapping("/user/toLogin.action")
22.  
    public String toLogin() {
23.  
    return "/login.jsp";
24.  
    }
25.  
    @RequestMapping("/user/login.action")
26.  
    public String login(User user,Model model,HttpServletRequest request) {
27.  
    Map<String,String> map=new HashMap<String,String>();
28.  
    map.put("name", user.getName());
29.  
    map.put("password", user.getPassword());
30.  
    if(userService.findUserByName(map)) {
31.  
    request.getSession().setAttribute("user","jiang");
32.  
    return "/admin/index.jsp";
33.  
    }
34.  
    model.addAttribute("errorMsg", "登录失败！账号或密码错误！");
35.  
    return "/login.jsp";
36.  
     
37.  
    }
38.  
     
39.  
    }

8、接下就是登录页面了

login.jsp

1.  
   <%@ page language="java" contentType="text/html; charset=utf-8"
2.  
   pageEncoding="utf-8"%>
3.  
   <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
4.  
   <!DOCTYPE html>
5.  
   <html lang="en">
6.  
   <head>
7.  
   <meta charset="UTF-8">
8.  
   <title>jiang's blog</title>
9.  
   <link rel="stylesheet" type="text/css" href="${pageContext.request.contextPath }/css/uploading.css">
10.  
    <link rel="stylesheet" type="text/css" href="${pageContext.request.contextPath }/css/bootstrap.min.css">
11.  
    <link rel="stylesheet" type="text/css" href="${pageContext.request.contextPath }/css/reset.css">
12.  
    <script type="text/javascript" src="${pageContext.request.contextPath }/js/bootstrap.min.js"></script>
13.  
    </head>
14.  
    <body class="upload_page">
15.  
    <div class="login">
16.  
    <div class="top">
17.  
    Login
18.  
    </div>
19.  
    <form action="login.action" method="post" onsubmit="return validate()">
20.  
    <div class="input-group login_input">
21.  
    <span class="input-group-addon" id="basic-addon1">
22.  
    <span class="glyphicon glyphicon-user" aria-hidden="true"></span>
23.  
    </span>
24.  
    <input name="name" type="text" class="form-control" placeholder="Username" aria-describedby="basic-addon1">
25.  
    </div>
26.  
    <div class="input-group login_input">
27.  
    <span class="input-group-addon" id="basic-addon1">
28.  
    <span class="glyphicon glyphicon-asterisk" aria-hidden="true"></span>
29.  
    </span>
30.  
    <input name="password" type="password" class="form-control" placeholder="Password" aria-describedby="basic-addon1">
31.  
    </div>
32.  
    <button type="submit" class="btn btn-info login_btn">登录</button>
33.  
    </form>
34.  
    <div class="error"><c:if test="${errorMsg!=null }"><font color="red">${errorMsg}</font></c:if></div>
35.  
    </div>
36.  
    </body>
37.  
    <script type="text/javascript">
38.  
     
39.  
    </script>
40.