Spring Cloud zuul自定义统一异常处理实现方法

zuul.SendErrorFilter.post.disable=true

public class ErrorFilter extends ZuulFilter {
  private static final String ERROR_STATUS_CODE_KEY = "error.status_code";
  private Logger log = LoggerFactory.getLogger(ErrorFilter.class);
  public static final String DEFAULT_ERR_MSG = "系统繁忙,请稍后再试";
  @Override
  public String filterType() {
    return "post";
  }
  @Override
  public int filterOrder() {
    return 0;
  }
  @Override
  public boolean shouldFilter() {
    RequestContext ctx = RequestContext.getCurrentContext();
    return ctx.containsKey(ERROR_STATUS_CODE_KEY);
  }
  @Override
  public Object run() {    
    RequestContext ctx = RequestContext.getCurrentContext();
    try {
      HttpServletRequest request = ctx.getRequest();
      int statusCode = (Integer) ctx.get(ERROR_STATUS_CODE_KEY);
      String message = (String) ctx.get("error.message");
      if (ctx.containsKey("error.exception")) {
        Throwable e = (Exception) ctx.get("error.exception");
        Throwable re = getOriginException(e);
        if(re instanceof java.net.ConnectException){
          message = "Real Service Connection refused";
          log.warn("uri:{},error:{}" ,request.getRequestURI(),re.getMessage());
        }else if(re instanceof java.net.SocketTimeoutException){
          message = "Real Service Timeout";
          log.warn("uri:{},error:{}" ,request.getRequestURI(),re.getMessage());
        }else if(re instanceof com.netflix.client.ClientException){
          message = re.getMessage();
          log.warn("uri:{},error:{}" ,request.getRequestURI(),re.getMessage());
        }else{
          log.warn("Error during filtering",e);
        }
      }
      if(StringUtils.isBlank(message))message = DEFAULT_ERR_MSG;
      request.setAttribute("javax.servlet.error.status_code", statusCode);
      request.setAttribute("javax.servlet.error.message", message);
      WebUtils.responseOutJson(ctx.getResponse(), JsonUtils.toJson(new WrapperResponse<>(statusCode, message)));
    } catch (Exception e) {
      String error = "Error during filtering[ErrorFilter]";
      log.error(error,e);
      WebUtils.responseOutJson(ctx.getResponse(), JsonUtils.toJson(new WrapperResponse<>(500, error)));
    }
    return null;
  }
  private Throwable getOriginException(Throwable e){
    e = e.getCause();
    while(e.getCause() != null){
      e = e.getCause();
    }
    return e;
  }
}

@Bean 
public ErrorFilter errorFilter(){
  return new ErrorFilter();
}