java http 异步请求_Java异步执行多个HTTP请求的例子（需要apache http类库）

标签：import java.util.concurrent.CountDownLatch;

import org.apache.http.HttpResponse;

import org.apache.http.client.config.RequestConfig;

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

import org.apache.http.concurrent.FutureCallback;

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

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

public class AsyncClientHttpExchangeFutureCallback {

public static void main(final String[] args) throws Exception {

RequestConfig requestConfig = RequestConfig.custom()

.setSocketTimeout(3000)

.setConnectTimeout(3000).build();

CloseableHttpAsyncClient httpclient = HttpAsyncClients.custom()

.setDefaultRequestConfig(requestConfig)

.build();

try {

httpclient.start();

final HttpGet[] requests = new HttpGet[] {

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

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

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

};

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

for (final HttpGet request: requests) {

httpclient.execute(request, new FutureCallback() {

@Override

public void completed(final HttpResponse response) {

latch.countDown();

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

}

@Override

public void failed(final Exception ex) {

latch.countDown();

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

}

@Override

public void cancelled() {

latch.countDown();

System.out.println(request.getRequestLine() + " cancelled");

}

});

}

latch.await();

System.out.println("Shutting down");

} finally {

httpclient.close();

}

System.out.println("Done");

}

}

标签：