表现层消息一致性，前后端数据协议

package com.lele.Controller.utils;

import lombok.Data;

@Data
public class R {
    private Boolean flag;
    private Object data;

    public R(){};
    public R(Boolean flag){
        this.flag = flag;
    }
    public R(Boolean flag,Object data){
        this.flag=flag;
        this.data=data;
    }
}

package com.lele.Controller;

import com.baomidou.mybatisplus.core.metadata.IPage;
import com.lele.Controller.utils.R;
import com.lele.Service.IUserService;
import com.lele.domain.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.util.List;

@RestController
@RequestMapping("/collects")
public class UserController2 {

    @Autowired
    private IUserService userService;


    @GetMapping
    public R getAll(){
        return new R(true,userService.list());
    }

    @PostMapping
    public R save(@RequestBody User user){
//        R r = new R();
//        boolean save = userService.save(user);
//        r.setFlag(save);
//        return r;
        return new R(userService.save(user));
    }

    @PutMapping
    public R update(@RequestBody User user){
        return new R(userService.updateById(user));
    }

    @DeleteMapping({"id"})
    public R delete(@PathVariable Integer id){
        return new R(userService.removeById(id));
    }


    @GetMapping("{id}")
    public R getById(@PathVariable Integer id){
        return new R(true,userService.getById(id));
    }

    @GetMapping("{currentPage}/{pageSize}")
    public R getPage(@PathVariable int currentPage, @PathVariable int pageSize){
        return new R(true,userService.getPage(currentPage,pageSize));
    }
}