java实现HttpClient异步请求资源的方法

2019-12-27 12:48答复哈 JAVA教程

这篇文章主要介绍了java实现HttpClient异步请求资源的方法,实例分析了java基于http协议实现异步请求的技巧,具有一定参考借鉴价值,需要的朋友可以参考下

本文实例讲述了java实现HttpClient异步请求资源的方法。分享给大家供大家参考。具体实现方法如下：

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									package demo;

									import java.util.concurrent.CountDownLatch;

									import org.apache.http.HttpResponse;

									import org.apache.http.client.methods.HttpGet;

									import org.apache.http.impl.nio.client.DefaultHttpAsyncClient;

									import org.apache.http.nio.client.HttpAsyncClient;

									import org.apache.http.nio.concurrent.FutureCallback;

									import org.apache.http.nio.reactor.IOReactorException;

									public class Main {

									 /**

									  * @param args

									  * @throws IOReactorException 

									  * @throws InterruptedException 

									  */

									 public static void main(String[] args) throws IOReactorException, InterruptedException {

									  final HttpAsyncClient httpclient = new DefaultHttpAsyncClient();

									  httpclient.start();

									  HttpGet[] requests = new HttpGet[] {

									    new HttpGet("http://www.apache.org/"),

									    new HttpGet("https://www.verisign.com/"),

									    new HttpGet("http://www.google.com/")

									  };

									  final CountDownLatch latch = new CountDownLatch(requests.length);

									  try {

									   for (final HttpGet request: requests) {

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

									     public void completed(final HttpResponse response) {

									      latch.countDown();

									      System.out.println(request.getRequestLine() + "->" + response.getStatusLine());

									     }

									     public void failed(final Exception ex) {

									      latch.countDown();

									      ex.printStackTrace();

									     }

									     public void cancelled() {

									      latch.countDown();

									     }

									    });

									   }

									   System.out.println("Doing...");

									  }finally {

									   latch.await();

									   httpclient.shutdown();

									  }

									  System.out.println("Done");

									 }

									}