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后端统一接口返回状态【模板】

开发过程中，每个接口的返回格式设计都是一样的，这样可以大大提高开发效率。

项目结构如下图：分别创建Result类和Constants接口

1 .Result类编写

• 未使用Lombok插件的Result类代码

  package com.wudreamer.springboot2.config;
  /*** 接口统一返回包装类*/
  public class Result {private String code;private String msg;private Object data;public Result() {// 无参构造函数}public Result(String code, String msg, Object data) {this.code = code;this.msg = msg;this.data = data;}public static Result success() {return new Result(Constants.CODE_200, "", null);}public static Result success(Object data) {return new Result(Constants.CODE_200, "", data);}public static Result error(String code, String msg) {return new Result(code, msg, null);}public static Result error() {return new Result(Constants.CODE_500, "系统错误", null);}public String getCode() {return code;}public void setCode(String code) {this.code = code;}public String getMsg() {return msg;}public void setMsg(String msg) {this.msg = msg;}public Object getData() {return data;}public void setData(Object data) {this.data = data;}
  }
  

• 使用Lombok插件后的Result类代码

  import com.ppj.constants.Constants;
  import lombok.AllArgsConstructor;
  import lombok.Data;
  import lombok.NoArgsConstructor;/*** 接口统一返回包装类*/
  @Data
  @NoArgsConstructor
  @AllArgsConstructor
  public class Result {private String code;private String msg;private Object data;public static Result success() {return new Result(Constants.CODE_200, "", null);}public static Result success(Object data) {return new Result(Constants.CODE_200, "", data);}public static Result error(String code, String msg) {return new Result(code, msg, null);}public static Result error() {return new Result(Constants.CODE_500, "系统错误", null);}}

2 .Constants类编写

存放状态码

package com.wudreamer.springboot2.config;public interface Constants {String CODE_200 = "200"; //成功String CODE_401 = "401";  // 权限不足String CODE_400 = "400";  // 参数错误String CODE_500 = "500"; // 系统错误String CODE_600 = "600"; // 其他业务异常}

3 .更改Controller层下的类return格式

将返回类型更改为Result、修改return 。

// 查询所有用户@GetMappingpublic Result findAll() {return Result.success(userService.findAll());}// 根据id查询单个用户@GetMapping("/{id}")public Result findById(@PathVariable Integer id) {return Result.success(userService.findById(id));}// 新增单个用户@PostMappingpublic Result insert(@RequestBody User user) {userService.insert(user);return Result.success();}// 修改用户@PutMappingpublic Result update(@RequestBody User user) {userService.update(user);return Result.success();}// 删除单个用户@DeleteMapping("/{id}")public Result delete(@PathVariable Integer id) {userService.delete(id);return Result.success();}