统一结果返回

1，状态静态常量

package com.mangoubiubiu.commonutils;

public interface ResultCode {
    //成功
    public static   Integer SUCCESS=20000;
    //失败
    public static   Integer ERROR=20001;
}

2，消息调用类，

     lombok  

//生成getset方法
@Data
//有参构造
@AllArgsConstructor
//无参构造
@NoArgsConstructor

package com.mangoubiubiu.commonutils;

import io.swagger.annotations.ApiModelProperty;
import lombok.Data;

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

/***
 * 统一返回结果
 */
@Data
public class R {

    @ApiModelProperty(value = "是否成功")
    private Boolean success;

    @ApiModelProperty(value = "返回码")
    private Integer code;

    @ApiModelProperty(value = "返回消息")
    private String message;
    @ApiModelProperty(value = "返回数据")
    private Map<String, Object> data = new HashMap<String, Object>();

    //构造器私有防止外部调用
    private R(){}
    //成功方法
    public static R ok(){
        R r=new R();
        r.setSuccess(true);
        r.setCode(ResultCode.SUCCESS);
        r.setMessage("成功");
        return r;
    }
   //失败方法
    public static R error(){
        R r=new R();
        r.setSuccess(false);
        r.setCode(ResultCode.ERROR);
        r.setMessage("失败");
        return r;
    }

    public R success(Boolean success){
        this.setSuccess(success);
        return this;
    }

    public R message(String message){
        this.setMessage(message);
        return this;
    }


    public R code(Integer code){
        this.setCode(code);
        return this;
    }


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

    public R data(Map<String, Object> map){
        this.setData(map);
        return this;
    }
}

3.controller调用

package com.mangoubiubiu.edu.controller;



import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.mangoubiubiu.commonutils.R;
import com.mangoubiubiu.edu.entity.Teacher;
import com.mangoubiubiu.edu.service.TeacherService;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import io.swagger.annotations.ApiParam;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.*;

import java.util.List;

/**
 * <p>
 * 讲师 前端控制器
 * </p>
 *
 * @author mangoubiubiu
 * @since 2020-09-22
 */
@Api(description = "讲师管理")
@RestController
@RequestMapping("/eduservice/edu-teacher")
public class TeacherController {

    @Autowired
    private TeacherService service;

    //rest风格

    /**
     * 查询所有的教师信息
     * @return
     */
    @ApiOperation(value = "所有的教师信息")
    @GetMapping("findAll")
    public R findAllTeacher(){


        List<Teacher>  list= service.list(null);
        return R.ok().data("items",list);
    }

    /**
     * @DeleteMapping("{id}") 通过路径传递
     * @PathVariable String id 得到路径中的id值
     * @param id
     * @return
     */
    @ApiOperation(value = "逻辑删除接口")
    @DeleteMapping("{id}")
    public R removeTeacher(@ApiParam(name="id",value = "讲师ID",required = true) @PathVariable String id){
        boolean flag=service.removeById(id);
        if(flag==true){
            return R.ok();
        }else {
            return R.error();
        }
    }


    /**
     *分页
     * @param current 当前页
     * @param limit 记录数
     * @return
     */
    @ApiOperation(value = "查询教师信息分页接口")
    @GetMapping("pageTeacher/{current}/{limit}")
    public R pageListTeacher(@ApiParam(name="current",value = "当前页",required = true) @PathVariable Long current,
                             @ApiParam(name="limit",value = "记录数",required = true) @PathVariable Long limit){
        //current:当前页，size：每页的记录数
        Page<Teacher> pageInfo=new Page<>(current,limit);

        //调用方法时底层会做封装，封装到pageInfo里面
        service.page(pageInfo,null);
        long total= pageInfo.getTotal();//总记录数
        List<Teacher> records = pageInfo.getRecords();//所有的数据list

        return R.ok().data("total",total).data("rows",records);

    }


    /**
     * 添加教师接口
     * @param
     * @return
     */
    @PostMapping("addTeacher")
    public R addTeacher(@RequestBody Teacher eduTeacher){
        boolean flag=  service.save(eduTeacher);
        if(flag==true){
            return R.ok();
        }else {
            return R.error();
        }
    }

    // 根据讲师id查询讲师信息
    @GetMapping("getTeacher/{id}")
    public  R getTeacher(@PathVariable String id){
        Teacher eduTeacher = service.getById(id);
        return R.ok().data("teacher",eduTeacher);

    }
    //讲师修改功能
    @PostMapping("updateTeacher")
    public R updateTeacher(@RequestBody Teacher eduTeacher){
        boolean flag= service.updateById(eduTeacher);
        if(flag==true){
            return R.ok();
        }else {
            return R.error();
        }
    }


}

4，效果