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");
}
}
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希望本文所述对大家的java程序设计有所帮助。