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<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");
 }
}

希望本文所述对大家的java程序设计有所帮助。