SSM框架的一个简单登录模块（包含注销功能）

首先准备：一个整合完毕的Maven项目，（借用上次整合完毕的SSM）

然后数据库、表、内容





使用mybatis generator生成的Mapper，mapping，model

UserMapper.java（对应dao层）

package phms.dao;

import java.util.List;

import phms.model.User;

public interface UserMapper {
int deleteByPrimaryKey(Integer id);

int insert(User record);

int insertSelective(User record);

User selectByPrimaryKey(Integer id);

int updateByPrimaryKeySelective(User record);

int updateByPrimaryKey(User record);

List<User> getAll();
}

UserMapper.xml（对应mapping层）

<?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="phms.dao.UserMapper" >
<resultMap id="BaseResultMap" type="phms.model.User" >
<id column="id" property="id" jdbcType="INTEGER" />
<result column="password" property="password" jdbcType="CHAR" />
<result column="name" property="name" jdbcType="CHAR" />
<result column="sex" property="sex" jdbcType="CHAR" />
<result column="phone_num" property="phoneNum" jdbcType="INTEGER" />
<result column="address" property="address" jdbcType="VARCHAR" />
<result column="manager" property="manager" jdbcType="INTEGER" />
</resultMap>
<sql id="Base_Column_List" >
id, password, name, sex, phone_num, address, manager
</sql>
<select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Integer" >
select
<include refid="Base_Column_List" />
from user
where id = #{id,jdbcType=INTEGER}
</select>
<delete id="deleteByPrimaryKey" parameterType="java.lang.Integer" >
delete from user
where id = #{id,jdbcType=INTEGER}
</delete>
<insert id="insert" parameterType="phms.model.User" >
insert into user (id, password, name,
sex, phone_num, address,
manager)
values (#{id,jdbcType=INTEGER}, #{password,jdbcType=CHAR}, #{name,jdbcType=CHAR},
#{sex,jdbcType=CHAR}, #{phoneNum,jdbcType=INTEGER}, #{address,jdbcType=VARCHAR},
#{manager,jdbcType=INTEGER})
</insert>
<insert id="insertSelective" parameterType="phms.model.User" >
insert into user
<trim prefix="(" suffix=")" suffixOverrides="," >
<if test="id != null" >
id,
</if>
<if test="password != null" >
password,
</if>
<if test="name != null" >
name,
</if>
<if test="sex != null" >
sex,
</if>
<if test="phoneNum != null" >
phone_num,
</if>
<if test="address != null" >
address,
</if>
<if test="manager != null" >
manager,
</if>
</trim>
<trim prefix="values (" suffix=")" suffixOverrides="," >
<if test="id != null" >
#{id,jdbcType=INTEGER},
</if>
<if test="password != null" >
#{password,jdbcType=CHAR},
</if>
<if test="name != null" >
#{name,jdbcType=CHAR},
</if>
<if test="sex != null" >
#{sex,jdbcType=CHAR},
</if>
<if test="phoneNum != null" >
#{phoneNum,jdbcType=INTEGER},
</if>
<if test="address != null" >
#{address,jdbcType=VARCHAR},
</if>
<if test="manager != null" >
#{manager,jdbcType=INTEGER},
</if>
</trim>
</insert>
<update id="updateByPrimaryKeySelective" parameterType="phms.model.User" >
update user
<set >
<if test="password != null" >
password = #{password,jdbcType=CHAR},
</if>
<if test="name != null" >
name = #{name,jdbcType=CHAR},
</if>
<if test="sex != null" >
sex = #{sex,jdbcType=CHAR},
</if>
<if test="phoneNum != null" >
phone_num = #{phoneNum,jdbcType=INTEGER},
</if>
<if test="address != null" >
address = #{address,jdbcType=VARCHAR},
</if>
<if test="manager != null" >
manager = #{manager,jdbcType=INTEGER},
</if>
</set>
where id = #{id,jdbcType=INTEGER}
</update>
<update id="updateByPrimaryKey" parameterType="phms.model.User" >
update user
set password = #{password,jdbcType=CHAR},
name = #{name,jdbcType=CHAR},
sex = #{sex,jdbcType=CHAR},
phone_num = #{phoneNum,jdbcType=INTEGER},
address = #{address,jdbcType=VARCHAR},
manager = #{manager,jdbcType=INTEGER}
where id = #{id,jdbcType=INTEGER}
</update>
</mapper>

User.java（对应model层）

package phms.model;

public class User {
private Integer id;

private String password;

private String name;

private String sex;

private Integer phoneNum;

private String address;

private Integer manager;

public Integer getId() {
return id;
}

public void setId(Integer id) {
this.id = id;
}

public String getPassword() {
return password;
}

public void setPassword(String password) {
this.password = password == null ? null : password.trim();
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name == null ? null : name.trim();
}

public String getSex() {
return sex;
}

public void setSex(String sex) {
this.sex = sex == null ? null : sex.trim();
}

public Integer getPhoneNum() {
return phoneNum;
}

public void setPhoneNum(Integer phoneNum) {
this.phoneNum = phoneNum;
}

public String getAddress() {
return address;
}

public void setAddress(String address) {
this.address = address == null ? null : address.trim();
}

public Integer getManager() {
return manager;
}

public void setManager(Integer manager) {
this.manager = manager;
}
}代码还是很多的，建议还是用工具生成，自己手写慢还容易出错

导入我们的项目中，如图



下一步service层的接口

很简单

LoginService.java

package phms.service;

public interface LoginService {
public boolean login(int id,String password,int manager);//定义该接口的方法
}
id就是我表的主键，manager表示的是职位是否是经理（0不是，1是）
登录使用boolean值比较方便，验证通过就是true，不通过就是false

接口写完了，下一步就是我们要实现这个接口呀！

LoginServiceImpl.java

package phms.serviceImpl;

import org.springframework.
4000
beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import phms.dao.UserMapper;
import phms.model.User;
import phms.service.LoginService;
@Service("LoginService")
public class LoginServiceImpl implements LoginService{  //继承该接口的方法
@Autowired
UserMapper userMapper;//实例化userMapper
public boolean login(int id,String password,int manager){//该方法的具体内容
User user = userMapper.selectByPrimaryKey(id); //selectByPrimaryKey()方法来自如UserMapper中
if (user != null) {
if (user.getId().equals(id) && user.getPassword().equals(password) && user.getManager().equals(manager))//dao层的get/set方法，获取数据库的值
return true;
}
        return false;
        }
 }
新手学到这很容易懵逼

我也是这样过来的，这个不懂的就去百度，一时半会也难以完全弄懂！！
下一步，控制器

LoginController.java

package phms.controller;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import phms.model.User;
import phms.service.LoginService;

/*控制类标记*/
@Controller
/*控制类访问地址的配置,启动服务器时自动映射这些类*/

public class LoginController {

@Autowired
private LoginService loginService; //注入service层

@RequestMapping(value="/login")//响应login
public String login(User user,HttpServletRequest request,HttpSession session){ //获取前台表单所传的值
try{
boolean loginType = loginService.login(user.getId(),user.getPassword(),user.getManager());
/*调用service中的login方法验证id，password，manager是否正确*/
if(loginType){
//如果验证通过,则将用户信息传到前台
//并跳转到success.jsp页面
if(user.getManager()==1){
request.setAttribute("user",user);
session.setAttribute("NowManager","经理");//设置session
return "jingli"; //经理的页面
}
else {
session.setAttribute("NowManager","管理员");
return "yuangong"; // 员工的页面

}
}
else{
//若不对,则将错误信息显示到错误页面
request.setAttribute("message","用户名密码错误");
return "redirect:loginErrors.jsp";

/*redirect：重定位路径，为了跳出web-inf。不加该标签则默认路径为web-inf/jsp/*.jsp   */

}}catch (Exception e) {// TODO: handle exceptionSystem.out.println(e);}return null;}@RequestMapping(value="/loginOut")//响应loginOutpublic String loginError(HttpSession session){//注销功能，删除登录成功时候的sessionsession.removeAttribute("NowUserName");session.removeAttribute("NowManager");return
"redirect:index.jsp";}}

接下来，就来写前台jsp页面：

index.jsp    loginErrors.jsp  这两个jsp是写在webapp下的，一定要是webapp下

jingli.jsp  yuangong.jsp写在web-inf/jsp下，一定要写在web-inf里面

因为你tomcat部署项目后，可以直接访问到任何一个webapp下的jsp，但是不能直接访问到web-inf下的jsp，保证项目的安全性（关键工作性的代码都是在/web-inf/里）

结构如图：



index.jsp

<%@ page language="java" import="java.util.*"
contentType="text/html; charset=UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<html>
<head>
<title>登录</title>
</head>
<body>
<div>
<form action="login" name="login" id="login" method="post">
职位<select name="manager" id="manager">
<option value="0" style="color: black;" >前台</option>
<option value="1" style="color: black;">经理</option>
</select>
请输入id：<input type="text" name="id">
请输入密码：<input type="password" name="password">
<input type="submit" value="登录" id="login">
</form>
</div>
</body>
</html>jingli.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<html>
<head>
<title>经理</title>
</head>
<body>
欢迎经理！！！
<a href="${pageContext.request.contextPath}/loginOut">注销</a>
</body>
</html>

yuangong.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<html>
<head>
<title>员工</title>
</head>
<body>
欢迎员工！！！
<a href="${pageContext.request.contextPath}/loginOut">注销</a>
</body>
</html>loginErrors.jsp
<%@ page language="java" import="java.util.*"
contentType="text/html; charset=UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<html>
<head>
<title>登录失败</title>
</head>
<body>
职位或id或密码错误！！！
</body>
</html>发布到tomcat上：
运行截图：





备注：这个例子的session请忽略！本来原版的登录模块是在service里面写了一个当前用户的方法，这里为了简便省略了！

总结一下这个登录模块：

首先：搞定你的mybatis需要的dao，mapping，model

然后根据模块功能写service

然后写serviceImpl

然后写jsp

然后写controller

然后..jsp和controller互相配合写

作者水平有限，有错误的地方请指正！！！