如何使用java httpclient 异步调用接口

使用Java HttpClient异步调用接口，可以通过创建异步请求配置对象，设置回调函数并执行异步请求来实现。具体步骤如下：

1.创建异步请求配置对象：

RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(5000).setConnectTimeout(5000).build();

2.创建异步请求执行器：

CloseableHttpAsyncClient httpclient = HttpAsyncClients.createDefault();
httpclient.start();

3.创建异步请求对象：

HttpUriRequest request = RequestBuilder.get().setUri("http://www.example.com/").setConfig(requestConfig).build();

4.设置回调函数：

Future<HttpResponse> future = httpclient.execute(request, new FutureCallback<HttpResponse>() {

    @Override
    public void completed(final HttpResponse response) {
        System.out.println(request.getRequestLine() + "->" + response.getStatusLine());
    }

    @Override
    public void failed(final Exception ex) {
        System.out.println(request.getRequestLine() + "->" + ex);
    }

    @Override
    public void cancelled() {
        System.out.println(request.getRequestLine() + " cancelled");
    }

});

5.执行异步请求：

httpclient.execute(request, future);

这样就可以使用Java HttpClient异步调用接口了。