本文實例講述了java實現HttpClient異步請求資源的方法。分享給大家供大家參考。具體實現方法如下：
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"); }}希望本文所述對大家的java程序設計有所幫助。