响应异常处理

@RestControllerAdvice

注解@RestControllerAdvice用法途-优快云博客

需求：

当http请求的时候，自动处理异常，并返回给前端。

异常分为：服务器内部异常Exception， 自定义业务异常

异常格式例如：

{"msg":"服务器内部异常","code":500,"success":false,"data":null}

实现思路：

        定义vo：

确定返回的json格式。

@JsonInclude
public class ResultVo<T> implements Serializable {

  private static final long serialVersionUID = -872079464102668214L;

  @Schema(description = "返回消息")
  private String msg;

  @Schema(description = "返回码")
  private Integer code;

  @Schema(description = "是否成功")
  private Boolean success;

  @Schema(description = "返回数据")
  private transient T data;

  public ResultVo() {
  }

  @JsonCreator(mode = Mode.PROPERTIES)
  public ResultVo(@JsonProperty("msg") String msg, @JsonProperty("code") Integer code,
                  @JsonProperty("success") Boolean success, @JsonProperty("data") T data) {
    this.msg = msg;
    this.code = code;
    this.success = success;
    this.data = data;
  }

  public static <T> ResultVo<T> create(ResponseCodeEnum codeEnum, Boolean success, T data) {
    return new ResultVo<>(codeEnum.getMsg(), codeEnum.getCode(), success, data);
  }

  public static <T> ResultVo<T> create(ResponseCodeEnum codeEnum, String msg, Boolean success, T data) {
    return new ResultVo<>(msg, codeEnum.getCode(), success, data);
  }

  public static <T> ResultVo<T> create(String msg, Integer code, Boolean success, T data) {
    return new ResultVo<>(msg, code, success, data);
  }

  public static <T> ResultVo<T> createSuccess(T data, String msg) {
    return create(SUCCESS, msg, true, data);
  }

  public static <T> ResultVo<T> createSuccess(T data) {
    return create(SUCCESS, true, data);
  }


  public String getMsg() {
    return this.msg;
  }

  public ResultVo<T> setMsg(String msg) {
    this.msg = msg;
    return this;
  }

  public Integer getCode() {
    return this.code;
  }

  public ResultVo<T> setCode(Integer code) {
    this.code = code;
    return this;
  }

  public Boolean getSuccess() {
    return this.success;
  }

  public ResultVo<T> setSuccess(Boolean success) {
    this.success = success;
    return this;
  }

  public T getData() {
    return this.data;
  }

  public ResultVo<T> setData(T data) {
    this.data = data;
    return this;
  }

  @Override
  public String toString() {
    return "ResultVo{" +
        "msg=\"" + msg + '\"' +
        ", code=" + code +
        ", success=" + success +
        ", data=" + data +
        '}';
  }
}

定义异常代码

public enum ResponseCodeEnum {
  /**
   * 成功代码
   */
  SUCCESS(0, "success"),
  /**
   * http成功
   */
  HTTP_SUCCESS(200, "success"),
  /**
   * 异常码，http相关
   */
  FORBIDDEN(403, "禁止访问"),
  NOT_FOUND(404, "资源不存在"),
  REQUIRE_ACCESS(407, "要求身份验证"),
  INTERNAL_EXCEPTION(500, "服务器内部异常"),

  /**
   * 业务异常码
   */
 


  private final int code;
  private final String msg;

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

  public int getCode() {
    return this.code;
  }

  public String getMsg() {
    return this.msg;
  }
}

异常处理：

处理三类，

Exception 一般为controller抛出的代码异常

BusinessException 自定义业务异常

BindException net异常

@RestControllerAdvice
public class GlobalRestRequestExceptionHandler {

  private static final String EX_MSG = "服务内部错误！";

  private static final Logger log = LoggerFactory.getLogger(GlobalRestRequestExceptionHandler.class);


  @ExceptionHandler(value = BusinessException.class)
  public ResultVo<?> businessExceptionHandler(HttpServletRequest request, BusinessException exception) {
    log.error("[GlobalRestRequestExceptionHandler.businessExceptionHandler] url is {}",
        request.getRequestURI(), exception);
    return new ResultVo<>(exception.getMessage(), exception.getCode(), false, null);
  }

  /**
   * 参数校验错误
   *
   * @param request   请求
   * @param exception 异常
   * @return 通用返回
   */
  @ExceptionHandler(value = BindException.class)
  public ResultVo<?> methodArgumentNotValidException(HttpServletRequest request, BindException exception) {
    BindingResult result = exception.getBindingResult();
    String message = null;
    //组装校验错误信息
    if (result.hasErrors()) {
      List<ObjectError> list = result.getAllErrors();
      StringBuilder errorMsgBuffer = new StringBuilder();
      for (ObjectError error : list) {
        if (error instanceof FieldError) {
          FieldError errorMessage = (FieldError) error;
          errorMsgBuffer.append(errorMessage.getDefaultMessage()).append(",");
        }
      }
      //返回信息格式处理
      message = errorMsgBuffer.substring(0, errorMsgBuffer.length() - 1);
    }
    if (message == null || message.isEmpty()) {
      message = EX_MSG;
    }
    log.error("[GlobalRestRequestExceptionHandler.methodArgumentNotValidException] url: {}, msg: {}",
        request.getRequestURI(), message);
    return new ResultVo<>(message, 500, false, null);
  }

  @ExceptionHandler(value = Exception.class)
  public ResultVo<?> exceptionHandler(HttpServletRequest request, Exception exception) {
    log.error("[GlobalRestRequestExceptionHandler.exceptionHandler] url: {}",
        request.getRequestURI(), exception);
    return ResultVo.create(INTERNAL_EXCEPTION, false, null);
  }

}

业务异常处理：

        定义异常基类

目录

@RestControllerAdvice

需求：

实现思路：

        定义vo：

定义异常代码

异常处理：

业务异常处理：

如何使用

改进

---

如何使用

try{}catch{}使用

业务判断 直接调用

return ResultVo.create(RULE_NOT_EXIST, false, false);

改进

业务异常和系统异常分包要明确，可以专门建一个包来放业务异常的枚举，一个模块一个异常枚举类。