IDEA中使用MyBatis进行登录

今天学习的是使用MyBatis来进行简单的登录,对于本博客内容表示看不懂的大家可以访问https://www.cnblogs.com/yjc1605961523/p/11599294.html 

上面的地址也是我之前写的关于MyBatis比较基础的知识点

我也是刚开始学习MyBatis 能写的东西都写在博客里面了

项目结构大致如图

第一步先准备相应的工具类

1.1获取SqlSession核心对象的核心类

package com.yjc.util;

import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import java.io.InputStream;

public class SqlSessionUtils {
    private static SqlSessionFactory factory;
    private SqlSessionUtils(){}

    //生产SqlSession
    public static synchronized SqlSession getSession(){
        //1:获取核心配置文件的字节流
        InputStream is=SqlSessionUtils.class.getResourceAsStream("/mybatis-config.xml");
        //2:将字节流作为参数 构建Session工厂
        factory=new SqlSessionFactoryBuilder().build(is);
        //3:调用工厂对象 生产session
        return factory.openSession();
    }
}

1.2用户实体类smbms_user(与数据库中表的字段名类型相同)

package com.yjc.entity;
import java.util.Date;

   /**
    * smbms_user 实体类
    * @author liangzz
    * @date2019-09-28 03:18 
    */ 

public class SmbmsUser{
     /**主键ID**/
    private Integer id;
     /**用户编码**/
    private String userCode;
     /**用户名称**/
    private String userName;
     /**用户密码**/
    private String userPassword;
     /**性别（1:女、 2:男）**/
    private Integer gender;
     /**出生日期**/
    private Date birthday;
     /**手机**/
    private String phone;
     /**地址**/
    private String address;
     /**用户角色（取自角色表-角色id）**/
    private Integer userRole;
     /**创建者（userId）**/
    private Integer createdBy;
     /**创建时间**/
    private Date creationDate;
     /**更新者（userId）**/
    private Integer modifyBy;
     /**更新时间**/
    private Date modifyDate;

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

    public Integer getId(){
        return id;
    }

    public void setUserCode(String userCode){
        this.userCode=userCode;
    }

    public String getUserCode(){
        return userCode;
    }

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

    public String getUserName(){
        return userName;
    }

    public void setUserPassword(String userPassword){
        this.userPassword=userPassword;
    }

    public String getUserPassword(){
        return userPassword;
    }

    public void setGender(Integer gender){
        this.gender=gender;
    }

    public Integer getGender(){
        return gender;
    }

    public void setBirthday(Date birthday){
        this.birthday=birthday;
    }

    public Date getBirthday(){
        return birthday;
    }

    public void setPhone(String phone){
        this.phone=phone;
    }

    public String getPhone(){
        return phone;
    }

    public void setAddress(String address){
        this.address=address;
    }

    public String getAddress(){
        return address;
    }

    public void setUserRole(Integer userRole){
        this.userRole=userRole;
    }

    public Integer getUserRole(){
        return userRole;
    }

    public void setCreatedBy(Integer createdBy){
        this.createdBy=createdBy;
    }

    public Integer getCreatedBy(){
        return createdBy;
    }

    public void setCreationDate(Date creationDate){
        this.creationDate=creationDate;
    }

    public Date getCreationDate(){
        return creationDate;
    }

    public void setModifyBy(Integer modifyBy){
        this.modifyBy=modifyBy;
    }

    public Integer getModifyBy(){
        return modifyBy;
    }

    public void setModifyDate(Date modifyDate){
        this.modifyDate=modifyDate;
    }

    public Date getModifyDate(){
        return modifyDate;
    }
}

1.3Dao层接口ILoginDao

package com.yjc.dao;


import com.yjc.entity.SmbmsUser;
import org.apache.ibatis.annotations.Select;

public interface ILoginDao {
　　　　//此处使用注解方式进行查询 xml方式见https://www.cnblogs.com/yjc1605961523/p/11599294.html
    @Select("SELECT * FROM smbms_user  where userCode=#{userCode} and userPassword=#{userPassword}")
    SmbmsUser loginCheck(SmbmsUser smbmsUser); //登录方法
}

和Dao层接口名称同名的XML配置文件

<?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.yjc.dao.ILoginDao">  //指向Dao层接口  由于使用的注解方式,xml里不做其他实现,xml其实也可以省略,修改核心配置文件,在此不多说了

</mapper>

1.4Service层接口

package com.yjc.service;

import com.yjc.entity.SmbmsUser;

public interface ILoginService {
    SmbmsUser loginCheck(SmbmsUser smbmsUser); //登录方法

}

1.5Service层实现类

package com.yjc.service.Impl;

import com.yjc.dao.ILoginDao;
import com.yjc.entity.SmbmsUser;
import com.yjc.service.ILoginService;
import com.yjc.util.SqlSessionUtils;
import org.apache.ibatis.session.SqlSession;

public class LoginServiceImpl implements ILoginService {
    SqlSession sqlSession= SqlSessionUtils.getSession();  //调用工具栏获取SqlSession对象
    ILoginDao mapper = sqlSession.getMapper(ILoginDao.class);  //映射Dao层接口
    @Override
    public SmbmsUser loginCheck(SmbmsUser smbmsUser) {
        return  mapper.loginCheck(smbmsUser);  //调用Dao层想对应的方法进行实现
    }
}

1.6Servlet

package com.yjc.servlet;


import com.yjc.entity.SmbmsUser;
import com.yjc.service.ILoginService;
import com.yjc.service.Impl.LoginServiceImpl;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet("/LoginServlet")
public class LoginServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    doGet(request,response);
    }
    ILoginService service=new LoginServiceImpl();
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String usercode = request.getParameter("usercode");  //获取表单提交的数据
        String password = request.getParameter("password");
        usercode=   new String(usercode.getBytes("ISO-8859-1"),"UTF-8");
        password=   new String(password.getBytes("ISO-8859-1"),"UTF-8");
        SmbmsUser smbmsUser=new SmbmsUser();
        smbmsUser.setUserCode(usercode);
        smbmsUser.setUserPassword(password);
        SmbmsUser smbmsUser2 = service.loginCheck(smbmsUser);   //调用service层的方法进行实现
        if (smbmsUser2!=null){
            request.setAttribute("smbmsUser",smbmsUser2);    //返回值不为空代表登录成功 进行转发否则重定向登录页面进行重新登录
            request.getRequestDispatcher("welcome.jsp").forward(request,response);
        }else{
            response.sendRedirect("login.jsp");
        }

    }
}

1.7JSP页面

<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2019/9/28
  Time: 13:34
  To change this template use File | Settings | File Templates.
--%>
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title>系统登录 - 超市账单管理系统</title>
    <link rel="stylesheet" href="css/style.css"/>
</head>
<body class="login_bg">
<section class="loginBox">
    <header class="loginHeader">
        <h1>超市账单管理系统</h1>
    </header>
    <section class="loginCont">
        <form class="loginForm" action="LoginServlet">  //表单提交地址为Servlet
            <div class="inputbox">
                <label for="user">用户名：</label>
                <input id="user" type="text" name="usercode" placeholder="请输入用户名" required/>
            </div>
            <div class="inputbox">
                <label for="mima">密码：</label>
                <input id="mima" type="password" name="password" placeholder="请输入密码" required/>
            </div>
            <div class="subBtn">
                <input type="submit" value="登录" />
                <input type="reset" value="重置"/>
            </div>

        </form>
    </section>
</section>

</body>
</html>

JSP效果展示