第69讲后端登录逻辑实现

Admin实体：

@TableName("t_admin")
@Data
public class Admin {

    @TableId(type = IdType.AUTO)
    private Integer id; // 编号

    private String userName; // 用户名

    private String password; // 密码

    @TableField(select = false)
    private String newPassword; // 新密码
}

再新建t_admin数据库表，以及mapper，service；

AdminController.java

/**
 * 管理员Controller
 * @author java1234_小锋
 * @site www.java1234.com
 * @company 南通小锋网络科技有限公司
 * @create 2022-05-04 17:53
 */
@RestController
public class AdminController {

    @Autowired
    private IAdminService adminService;

    /**
     * 管理员登录
     * @param admin
     * @return
     */
    @PostMapping("/adminLogin")
    public R adminLogin(@RequestBody Admin admin){
        if(admin==null){
          return R.error();
        }
        if(StringUtil.isEmpty(admin.getUserName())){
            return R.error("用户名不能位空！");
        }
        if(StringUtil.isEmpty(admin.getPassword())){
            return R.error("密码不能位空！");
        }
        Admin resultAdmin = adminService.getOne(new QueryWrapper<Admin>().eq("userName", admin.getUserName()));
        if(resultAdmin==null){
            return R.error("用户名不存在");
        }
        if(!resultAdmin.getPassword().trim().equals(admin.getPassword())){
            return R.error("用户名或者密码错误！");
        }
        String token = JwtUtils.createJWT("-1", "admin", SystemConstant.JWT_TTL);
        Map<String,Object> resultMap=new HashMap<>();
        resultMap.put("token",token);
        return R.ok(resultMap);

    }

}

前端引入axios，以及ElMessage组件

import axios from 'axios'
import {ElMessage} from 'element-plus'

axios请求：

const handleLogin=()=>{
  formRef.value.validate(async (valid)=>{
    if(valid){
      axios.post("http://localhost:8081/adminLogin",form.value)
        .then(response=>{
          console.log((response.data))
        }).catch(error=>{
          ElMessage.error('系统运行出错，请联系管理员')
      })
    }
  })
}

跨域问题解决：

    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/**")
                .allowedOrigins("*")
                .allowCredentials(true)
                .allowedMethods("GET", "HEAD", "POST", "PUT", "DELETE","OPTIONS")
                .maxAge(3600);
    }

AdminMapper.xml

<?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.java1234.mapper.AdminMapper">


</mapper>

Admin.java

package com.java1234.entity;

import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;

/**
 * 管理员实体
 * @author java1234_小锋
 * @site www.java1234.com
 * @company 南通小锋网络科技有限公司
 * @create 2022-02-05 7:47
 */
@TableName("t_admin")
@Data
public class Admin {

    @TableId(type = IdType.AUTO)
    private Integer id; // 编号

    private String userName; // 用户名

    private String password; // 密码

    @TableField(select = false)
    private String newPassword; // 新密码
}

AdminMapper

package com.java1234.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.java1234.entity.Admin;

/**
 * 管理员Mapper接口
 * @author java1234_小锋
 * @site www.java1234.com
 * @company 南通小锋网络科技有限公司
 * @create 2022-02-23 22:00
 */
public interface AdminMapper extends BaseMapper<Admin> {
}

IAdminService

package com.java1234.service;

import com.baomidou.mybatisplus.extension.service.IService;
import com.java1234.entity.Admin;

/**
 * 管理员Service接口
 * @author java1234_小锋
 * @site www.java1234.com
 * @company 南通小锋网络科技有限公司
 * @create 2022-02-23 22:01
 */
public interface IAdminService extends IService<Admin> {
}

IAdminServiceImpl

package com.java1234.service.impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.java1234.entity.Admin;
import com.java1234.mapper.AdminMapper;
import com.java1234.service.IAdminService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * 管理员Service实现类
 * @author java1234_小锋
 * @site www.java1234.com
 * @company 南通小锋网络科技有限公司
 * @create 2022-02-23 22:02
 */
@Service("adminService")
public class IAdminServiceImpl extends ServiceImpl<AdminMapper,Admin> implements IAdminService {

    @Autowired
    private AdminMapper adminMapper;
}

AdminController

package com.java1234.controller.admin;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.java1234.constant.SystemConstant;
import com.java1234.entity.Admin;
import com.java1234.entity.R;
import com.java1234.service.IAdminService;
import com.java1234.util.JwtUtils;
import com.java1234.util.StringUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;

import java.util.HashMap;
import java.util.Map;

/**
 * 管理员Controller
 * @author java1234_小锋
 * @site www.java1234.com
 * @company 南通小锋网络科技有限公司
 * @create 2022-05-04 20:02
 */
@RestController
public class AdminController {

    @Autowired
    private IAdminService adminService;

    /**
     * 管理员登录
     * @param admin
     * @return
     */
    @PostMapping("/adminLogin")
    public R adminLogin(@RequestBody Admin admin){
        if(admin==null){
            return R.error();
        }
        if(StringUtil.isEmpty(admin.getUserName())){
            return R.error("用户名不能为空！");
        }
        if(StringUtil.isEmpty(admin.getPassword())){
            return R.error("密码不能为空！");
        }
        Admin resultAdmin = adminService.getOne(new QueryWrapper<Admin>().eq("userName", admin.getUserName()));
        if(resultAdmin==null){
            return R.error("用户名不存在");
        }
        if(!resultAdmin.getPassword().trim().equals(admin.getPassword())){
            return R.error("用户名或者密码错误！");
        }
        String token = JwtUtils.createJWT("-1", "admin", SystemConstant.JWT_TTL);
        Map<String,Object> resultMap=new HashMap<>();
        resultMap.put("token",token);
        return R.ok(resultMap);
    }
}