SpringBoot优雅的全局异常处理

• 导入依赖

  <!--fastjson-->
  <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>fastjson</artifactId>
      <version>1.2.41</version>
  </dependency>
  
  <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
  </dependency>
  
  

• 自定义数据格式

  后台返回统一数据格式

  //保证序列化Json的时候，如果是null的对象，key也会消失
  @JsonInclude(JsonInclude.Include.NON_NULL)
  public class ResponseResult<T> implements Serializable{
      private int status;
  
      private String msg;
  
      private  T data;
  
      private ResponseResult(int status)
      {
          this.status = status;
      }
      private ResponseResult(int status, T data)
      {
          this.status = status;
          this.data = data;
      }
      private ResponseResult(int status, String msg, T data)
      {
          this.status = status;
          this.msg = msg;
          this.data = data;
      }
      private ResponseResult(int status, String msg)
      {
          this.status = status;
          this.msg = msg;
      }
  
  
      public int getStatus() {
          return status;
      }
  
      //使之不在json序列化结果当中
      @JsonIgnore
      public Boolean isSuccess()
      {
          return this.status == ResponseCode.SUCCESS.getCode();
      }
  
      public String getMsg() {
          return msg;
      }
  
      public T getData() {
          return data;
      }
  
      public static <T> ResponseResult<T> createBySuccess()
      {
          return  new ResponseResult<T>(ResponseCode.SUCCESS.getCode());
      }
  
      public static <T> ResponseResult<T> createBySuccessMessage(String msg)
      {
          return new ResponseResult<T>(ResponseCode.SUCCESS.getCode(),msg);
      }
  
      public static <T> ResponseResult<T> createBySuccess(T data)
      {
          return new ResponseResult<T>(ResponseCode.SUCCESS.getCode(),data);
      }
  
      public static <T> ResponseResult<T> createBySuccess(String msg, T data)
      {
          return  new ResponseResult<T>(ResponseCode.SUCCESS.getCode(),msg,data);
      }
      /******************errorMsg************************/
  
      public static <T> ResponseResult<T> createByError()
      {
          return  new ResponseResult<T>(ResponseCode.SUCCESS.getCode(),ResponseCode.ERROR.getDesc());
      }
      public static <T> ResponseResult<T> createByErrorMessage(String errorMsg)
      {
          return new ResponseResult<T>(ResponseCode.ERROR.getCode(),errorMsg);
      }
      public static <T> ResponseResult<T> createByErrorMessage(int errorCode, String errorMessage)
      {
          return new ResponseResult<T>(errorCode,errorMessage);
      }
  
  }
  
  

• 自定义枚举类

  统一定义返回数据的格式中的code和message的值

  public enum  ResponseCode {
    
      NEED_LOGIN(10,"NEED LOGIN"),
      ILLEGAL_ARGUMENT(2,"ILLEGAL ARGUMENT"),
      SUCCESS(200, "成功!"),
      BODY_NOT_MATCH(400,"请求的数据格式不符!"),
      SIGNATURE_NOT_MATCH(401,"请求的数字签名不匹配!"),
      NOT_FOUND(404, "未找到该资源!"),
      INTERNAL_SERVER_ERROR(500, "服务器内部错误!"),
      SERVER_BUSY(503,"服务器正忙，请稍后再试!");
  
      private final String desc;
      private final int code;
  
      ResponseCode(int code,String desc){
          this.code = code;
          this.desc = desc;
      }
  
      public String getDesc() {
          return desc;
      }
  
      public int getCode() {
          return code;
      }
  }
  

• 自定义异常类

  @Data
  public class BizException extends  RuntimeException {
  
      private static final Long serialVersionUID = 1L;
  
      /**
       * 错误码
       */
      private int errorCode;
  
      /**
       * 错误信息
       */
      private String errorMessage;
  
      public BizException(String errorMessage) {
          super(errorMessage);
          this.errorMessage = errorMessage;
      }
  
      public BizException(String errorMessage, Throwable cause) {
          super(errorMessage, cause);
          this.errorMessage = errorMessage;
      }
  
      public BizException(int errorCode, String errorMessage) {
          super(errorMessage);
          this.errorMessage = errorMessage;
          this.errorCode = errorCode;
      }
  
      public BizException(int errorCode, String errorMessage, Throwable cause) {
          super(errorMessage,cause);
          this.errorMessage = errorMessage;
          this.errorCode = errorCode;
      }
  }
  

• 全局异常处理类

  @RestControllerAdvice
  @Slf4j
  public class GlobalExceptionHandler {
  
      @ExceptionHandler(BizException.class)
      public ResponseResult handleBizException(BizException e)
      {
         return ResponseResult.createByErrorMessage(e.getErrorCode(),e.getErrorMessage());
      }
  
      /**
       * 处理其他异常
       * @param req
       * @param e
       * @return
       */
      @ExceptionHandler(value =Exception.class)
      @ResponseBody
      public ResponseResult exceptionHandler(HttpServletRequest req, Exception e) {
          log.error("未知异常！原因是:", e);
          return ResponseResult.createByErrorMessage(ResponseCode.ILLEGAL_ARGUMENT.getDesc());
  
      }
  }