RestTemplate可以自定义重试次数

/**
         * 重试处理
         * 默认是重试3次
         */
        //禁用重试(参数：retryCount、requestSentRetryEnabled)
        HttpRequestRetryHandler requestRetryHandler = new DefaultHttpRequestRetryHandler(0, false);
        //自定义重试策略
        HttpRequestRetryHandler myRetryHandler = new HttpRequestRetryHandler() {
 
            public boolean retryRequest(IOException exception, int executionCount, HttpContext context) {
                //Do not retry if over max retry count
                if (executionCount >= 3) {
                    return false;
                }
                //Timeout
                if (exception instanceof InterruptedIOException) {
                    return false;
                }
                //Unknown host
                if (exception instanceof UnknownHostException) {
                    return false;
                }
                //Connection refused
                if (exception instanceof ConnectTimeoutException) {
                    return false;
                }
                //SSL handshake exception
                if (exception instanceof SSLException) {
                    return false;
                }
                
                HttpClientContext clientContext = HttpClientContext.adapt(context);
                HttpRequest request = clientContext.getRequest();
                boolean idempotent = !(request instanceof HttpEntityEnclosingRequest);
                //Retry if the request is considered idempotent
                //如果请求类型不是HttpEntityEnclosingRequest，被认为是幂等的，那么就重试
                //HttpEntityEnclosingRequest指的是有请求体的request，比HttpRequest多一个Entity属性
                //而常用的GET请求是没有请求体的，POST、PUT都是有请求体的
                //Rest一般用GET请求获取数据，故幂等，POST用于新增数据，故不幂等
                if (idempotent) {
                    return true;
                }
                
                return false;
            }
        };