Java异步执行多个HTTP请求的例子(需要apache http类库)
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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<HttpResponse>() { @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"); } }
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