目录

一. 登录需求分析

二. 配置返回通用结果类

三. 登录请求API

四. 创建实体类并实现登录逻辑  

四. 功能测试

附录

页面原型

 1. 登录页面展示： 项目路径（resourcesbackendpageloginlogin.html）

员工点击登录按钮进行后管平台的登录操作，登录正确以外方式不可登录。

登录处理逻辑

1. 将页面提交的密码进行MD5加密
2. 根据用户名查数据库(查不到返回结果)
3.  比对密码(密码错误返回结果)
4. 查询员工状态，员工状态禁用下不可登录
5. 登录成功，写入session中，返回结果。

二. 配置返回通用结果类

package com.itheima.reggie.common;

import lombok.Data;
import java.util.HashMap;
import java.util.Map;



@Data
public class R {

    
    private Integer code;

    
    private String msg;

    
    private T data;

    
    private Map map = new HashMap();

    public static  R success(T object) {
        R r = new R();
        r.data = object;
        r.code = 1;
        return r;
    }

    public static  R error(String msg) {
        R r = new R();
        r.msg = msg;
        r.code = 0;
        return r;
    }

    public R add(String key, Object value) {
        this.map.put(key, value);
        return this;
    }

}

三. 登录请求API

说明	值
请求URL	/employee/login
请求数据	{   "username": "admin",   "password": "123456" }
返回数据	{   "code": 0,   "msg": "登录成功",   "data": null,   "map": {} }

四. 创建实体类并实现登录逻辑  

entity: 创建实体类

创建Employee.java（员工对象）

package com.itheima.reggie.entity;

import com.baomidou.mybatisplus.annotation.FieldFill;
import com.baomidou.mybatisplus.annotation.TableField;
import lombok.Data;
import java.io.Serializable;
import java.time.LocalDateTime;


@Data
public class Employee implements Serializable {

    
    private static final long serialVersionUID = 1L;

    
    private Long id;

    
    private String username;

    
    private String name;

    
    private String password;

    
    private String phone;

    
    private String sex;

    
    private String idNumber;

    
    private Integer status;

    
    private LocalDateTime createTime;

    
    private LocalDateTime updateTime;

    
    @TableField(fill = FieldFill.INSERT)
    private Long createUser;

    
    @TableField(fill = FieldFill.INSERT_UPDATE)
    private Long updateUser;

}

mapper数据库交互层

package com.itheima.reggie.mapper;


import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.itheima.reggie.entity.Employee;
import org.apache.ibatis.annotations.Mapper;


@Mapper
public interface EmployeeMapper extends BaseMapper {
}

service业务层接口

package com.itheima.reggie.service;


import com.baomidou.mybatisplus.extension.service.IService;
import com.itheima.reggie.entity.Employee;
import org.springframework.stereotype.Service;


public interface EmployeeService extends IService {

}

业务层实现类

package com.itheima.reggie.service.impl;


import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.entity.Employee;
import com.itheima.reggie.mapper.EmployeeMapper;
import com.itheima.reggie.service.EmployeeService;
import org.springframework.stereotype.Service;


@Service
public class EmployeeServiceImpl extends ServiceImpl implements EmployeeService {


}

controller控制层

package com.itheima.reggie.controller;


import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.itheima.reggie.common.CommonsConst;
import com.itheima.reggie.common.R;
import com.itheima.reggie.entity.Employee;
import com.itheima.reggie.service.EmployeeService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.DigestUtils;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;


@Slf4j
@RestController
@RequestMapping("/employee")
public class EmployeeController {

    @Resource
    private EmployeeService employeeService = null;

    
    @PostMapping("/login")
    public R login(HttpServletRequest request,
                             @RequestBody Employee employee) {
        // 将页面提交的密码进行MD5加密
        String password = employee.getPassword();
        password = DigestUtils.md5DigestAsHex(password.getBytes());
        // 根据用户名查数据库
        LambdaQueryWrapper queryWrapper = new LambdaQueryWrapper();
        queryWrapper.eq(Employee::getUsername, employee.getUsername());
        Employee emp = employeeService.getOne(queryWrapper);
        // 查不到返回登录失败结果
        if(emp == null){
            return R.error(CommonsConst.LOGIN_FAIL);
        }
        // 比对密码
        if(!emp.getPassword().equals(password)){
            return R.error(CommonsConst.LOGIN_FAIL);
        }
        // 查看员工状态
        if(emp.getStatus() == CommonsConst.EMPLOYEE_STATUS_NO){
            return R.error(CommonsConst.LOGIN_ACCOUNT_STOP);
        }
        // 登录成功将员工的ID放入session中
        request.getSession().setAttribute("employeeId",emp.getId());
        return R.success(emp);
    }
}

四. 功能测试

Debug测试时主要测试以下几点：

1. 用户名与密码的校验
2. 用户状态禁用情况下
3. 数据是否正确返回

附录

常量类：

package com.itheima.reggie.common;



public class CommonsConst {

    // 登录失败
    public static final String LOGIN_FAIL = "登录失败";

    // 账号禁用
    public static final String LOGIN_ACCOUNT_STOP = "账号禁止使用";

    // 员工账号禁用状态 0：禁用
    public static final Integer EMPLOYEE_STATUS_NO = 0;

    // 员工账号正常状态 1：正常使用
    public static final Integer EMPLOYEE_STATUS_YES = 1;
}