java实现HttpClient异步请求资源的方法

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：

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() {

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");

}

}

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