Java前后端分离定义统一结果返回类

ゝ一世哀愁。 2023-09-27 13:12 232阅读 0赞

项目中我们会将响应封装成json返回， 一般在项目中我们会将所有接口的数据格式统一， 使前端(iOS Android, Web)对数据的操作更一致、轻松。一般会包含**状态码**、**返回消息**、**数据**这几部分内容。

#### 1.一般有以下几种json返回形式： ####

**列表：**

{
      "code": 200,
      "message": "成功",
      "data": [
        {
          "id": 2,
          "roleName": "系统管理员"
        }
      ],
      "ok": true
    }

**分页：**

{
      "code": 200,
      "message": "成功",
      "data": {
        "records": [
          {
            "id": 2,
            "roleName": "系统管理员"
          },
          {
            "id": 3,
            "name": "普通管理员"
          }
        ],
        "total": 10,
        "size": 3,
        "current": 1,
        "orders": [],
        "hitCount": false,
        "searchCount": true,
        "pages": 2
      },
      "ok": true
    }

**无数据返回：**

{
      "code": 200,
      "message": "成功",
      "data": null,
      "ok": true
    }

**失败：**

{
      "code": 201,
      "message": "失败",
      "data": null,
      "ok": false
    }

#### 2.定义统一返回结果类 ####

import lombok.Data;
    
    /**
     * 全局统一返回结果类
     *
     */
    @Data
    public class Result<T> {
    
        //返回码
        private Integer code;
    
        //返回消息
        private String message;
    
        //返回数据
        private T data;
    
        public Result(){}
    
        // 返回数据
        protected static <T> Result<T> build(T data) {
            Result<T> result = new Result<T>();
            if (data != null)
                result.setData(data);
            return result;
        }
    
        public static <T> Result<T> build(T body, Integer code, String message) {
            Result<T> result = build(body);
            result.setCode(code);
            result.setMessage(message);
            return result;
        }
    
        public static <T> Result<T> build(T body, ResultCodeEnum resultCodeEnum) {
            Result<T> result = build(body);
            result.setCode(resultCodeEnum.getCode());
            result.setMessage(resultCodeEnum.getMessage());
            return result;
        }
    
        public static<T> Result<T> ok(){
            return Result.ok(null);
        }
    
        /**
         * 操作成功
         * @param data  baseCategory1List
         * @param <T>
         * @return
         */
        public static<T> Result<T> ok(T data){
            Result<T> result = build(data);
            return build(data, ResultCodeEnum.SUCCESS);
        }
    
        public static<T> Result<T> fail(){
            return Result.fail(null);
        }
    
        /**
         * 操作失败
         * @param data
         * @param <T>
         * @return
         */
        public static<T> Result<T> fail(T data){
            Result<T> result = build(data);
            return build(data, ResultCodeEnum.FAIL);
        }
    
        public Result<T> message(String msg){
            this.setMessage(msg);
            return this;
        }
    
        public Result<T> code(Integer code){
            this.setCode(code);
            return this;
        }
    }

#### 3.统一返回结果状态信息类 ####

import lombok.Getter;
    
    /**
     * 统一返回结果状态信息类
     *
     */
    @Getter
    public enum ResultCodeEnum {
    
        SUCCESS(200,"成功"),
        FAIL(201, "失败"),
        SERVICE_ERROR(2012, "服务异常"),
        DATA_ERROR(204, "数据异常"),
        ILLEGAL_REQUEST(205, "非法请求"),
        REPEAT_SUBMIT(206, "重复提交"),
        ARGUMENT_VALID_ERROR(210, "参数校验异常"),
    
        LOGIN_AUTH(208, "未登陆"),
        PERMISSION(209, "没有权限"),
        ACCOUNT_ERROR(214, "账号不正确"),
        PASSWORD_ERROR(215, "密码不正确"),
        LOGIN_MOBLE_ERROR( 216, "账号不正确"),
        ACCOUNT_STOP( 217, "账号已停用"),
        NODE_ERROR( 218, "该节点下有子节点，不可以删除")
        ;
    
        private Integer code;
    
        private String message;
    
        private ResultCodeEnum(Integer code, String message) {
            this.code = code;
            this.message = message;
        }
    }

#### 4.接口该怎么写 ####

以简单的增删改查为例：

查找方法：有数据返回

@GetMapping("findAll")
    public Result<List<SysRole>> findAll() {
        List<SysRole> roleList = sysRoleService.list();
        return Result.ok(roleList);
    }

删除方法：无数据返回

@ApiOperation("批量删除角色")
        @DeleteMapping("/batchRemove")
        public Result batchRemove(@RequestBody List<Long> ids) {
            boolean isDelete = sysRoleService.removeByIds(ids);
            if (isDelete) {
                return Result.ok();
            } else {
                return Result.fail();
            }
        }