后端统一接口返回状态【初步模板】

后端统一接口返回状态【模板】

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
    @GetMapping
    public 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
    @PostMapping
    public Result insert(@RequestBody User user) {
        userService.insert(user);
        return Result.success();
    }

    // 修改用户
    @PutMapping
    public 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();
    }