使用HttpAsyncClients设置重试次数

CloseableHttpAsyncClient httpclient = HttpAsyncClients.createDefault();

HttpRequestRetryHandler retryHandler = new HttpRequestRetryHandler() {
    @Override
    public boolean retryRequest(IOException exception, int executionCount, HttpContext context) {
        // 设置重试次数
        int maxRetries = 3;
        if (executionCount > maxRetries) {
            // 超过最大重试次数，不再重试
            return false;
        }
        if (exception instanceof NoHttpResponseException) {
            // 服务器未响应，重试
            return true;
        }
        if (exception instanceof SSLHandshakeException) {
            // SSL握手异常，不重试
            return false;
        }
        HttpRequest request = (HttpRequest) context.getAttribute(HttpCoreContext.HTTP_REQUEST);
        boolean idempotent = !(request instanceof HttpEntityEnclosingRequest);
        if (idempotent) {
            // 请求是幂等的，重试
            return true;
        }
        return false;
    }
};

RequestConfig requestConfig = RequestConfig.custom()
    .setConnectTimeout(5000) // 连接超时时间为5秒
    .setSocketTimeout(5000) // 读取超时时间为5秒
    .setConnectionRequestTimeout(5000) // 请求超时时间为5秒
    .build();

HttpGet httpGet = new HttpGet("http://example.com");
httpGet.setConfig(requestConfig);

httpclient.execute(httpGet, null, new FutureCallback<HttpResponse>() {
    @Override
    public void completed(HttpResponse result) {
        // 请求成功的处理逻辑
    }

    @Override
    public void failed(Exception ex) {
        // 请求失败的处理逻辑
    }

    @Override
    public void cancelled() {
        // 请求取消的处理逻辑
    }
});