HttpAsyncClient

HttpAsyncClient

HttpAsyncClient 是一个异步的 HTTP 客户端开发包，基于 HttpCore NIO 和 HttpClient 组件。
HttpAsyncClient 的出现并不是为了替换 HttpClient，而是作为一个补充用于需要大量并发连接，对性能要求非常高的基于HTTP的原生数据通信，而且提供了事件驱动的 API。

代码示例：

       public Vector<Long> Gets(List<String> urls)

throws IOReactorException, InterruptedException {

List<HttpGet> requests = new ArrayList<HttpGet>();

for (String url : urls) {

HttpGet get = new HttpGet(url);

requests.add(get);

}

final Vector<Long> dataPackages = new Vector<Long>();

HttpAsyncClient httpclient = new DefaultHttpAsyncClient();

httpclient.getParams().setIntParameter("http.socket.timeout", 5000)

.setIntParameter("http.connection.timeout", 5000)

.setIntParameter("http.socket.buffer-size", 8192)

.setBooleanParameter("http.tcp.nodelay", true);

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

httpclient.start();

try {

for (final HttpGet request : requests) {

httpclient.execute(request, new FutureCallback<HttpResponse>() {

@Override

public void completed(HttpResponse result) {

String statInfo = "";

try {

statInfo = result.getFirstHeader("statInfo").getValue();

if (statInfo != null) {

Long size = Long.parseLong(statInfo.split(",")[0].split(":")[1]);

dataPackages.add(size);

}

} catch (Exception e) {

System.out.println(e);

System.out.println(statInfo);

}

latch.countDown();

}

@Override

public void failed(Exception ex) {

latch.countDown();

}

@Override

public void cancelled() {

latch.countDown();

}

});

}

latch.await();

} finally {

httpclient.shutdown();

}

return dataPackages;

}

 

依赖的pom，httpasyncclient已经有4.0-beta3版本了

<dependency>

    <groupId>org.apache.httpcomponents</groupId>

    <artifactId>httpasyncclient</artifactId>

    <version>4.0-beta1</version>

</dependency>

<dependency>

    <groupId>org.apache.httpcomponents</groupId>

    <artifactId>httpclient</artifactId>

    <version>4.2-beta1</version>

</dependency>