springboot统一接口返回数据的实现

一，没有异常的情况，正常返回数据

希望接口统一返回的数据格式如下：

{
  "status": 0,
  "msg": "成功",
  "data": null
}

和接口数据对应的bean

public class Result implements Serializable {

  private static final long serialVersionUID = 1L;

  
  private int status;

  
  private String msg;

  
  private T data;

  public int getStatus() {
    return status;
  }

  public void setStatus(int status) {
    this.status = status;
  }

  public String getMsg() {
    return msg;
  }

  public void setMsg(String msg) {
    this.msg = msg;
  }

  public T getData() {
    return data;
  }

  public void setData(T data) {
    this.data = data;
  }
}

操作Result实体的工具类

public class ResultUtils {

  
  public static  Result success(T t){
    Result result = new Result<>();
    result.setStatus(ResultEnum.SUCCESS.getCode());
    result.setMsg(ResultEnum.SUCCESS.getMsg());
    result.setData(t);
    return result;
  }

  
  public static  Result success(){
    return success(null);
  }

  
  public static  Result error(int status, String msg){
    Result result = new Result<>();
    result.setStatus(status);
    result.setMsg(msg);
    return result;
  }
}

封装错误码和错误消息的枚举类

public enum ResultEnum {

  UNKNOWN_ERROR(-1, "未知错误"),
  SUCCESS(0, "成功"),
  BASIC_INFO_ID_IS_EMPTY(600, "基本信息中BasicInfoId为空"),
  BASIC_INFO_ADD_TO_DATAbase_FAILURE(601, "向数据库添加基本信息失败"),
  DETAILS_DATA_BASIC_INFO_ID_IS_EMPTY(602, "测试数据中BasicInfoId为空"),
  DETAILS_DATA_ADD_TO_DATAbase_FAILURE(603, "向数据库添加测试数据失败");

  ResultEnum(int code, String msg) {
    this.code = code;
    this.msg = msg;
  }

  private int code;

  private String msg;

  public int getCode() {
    return code;
  }

  public void setCode(int code) {
    this.code = code;
  }

  public String getMsg() {
    return msg;
  }

  public void setMsg(String msg) {
    this.msg = msg;
  }

  @Override
  public String toString() {
    return "ResultEnum{" +
 "code=" + code +
 ", msg='" + msg + ''' +
 '}';
  }
}

统一封装返回结果的切面

之所以需要这个切面，是为了避免每个Controller方法中都要调用ResultUtils.success()。有了这个切面，Controller可以和原来一样正常返回对象，字符串，void，在切面里面将结果封装成Result实体，而不需要每个Controller方法都返回Result实体。

@ControllerAdvice
public class MyResponseAdvice implements ResponseBodyAdvice