HttpClient4.5 使用http连接池发送http请求深度示例

HttpClient 3.x,4.x都提供http连接池管理器,当使用了请求连接池管理器（比如PoolingHttpClientConnectionManager）后，HttpClient就可以同时执行多个线程的请求了。

hc3.x和4.x的早期版本,提供了PoolingClientConnectionManager,DefaultHttpClient等类来实现http连接池,但这些类在4.3.x版本之后大部分就已经过时,本文使用4.3.x提供的最新的PoolingHttpClientConnectionManager等类进行http连接池的实现.
废话不多说,下面是全部代码:

public class PoolTest {    private static void config(HttpRequestBase httpRequestBase) {        httpRequestBase.setHeader("User-Agent", "Mozilla/5.0");        httpRequestBase.setHeader("Accept","text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");        httpRequestBase.setHeader("Accept-Language", "zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3");//"en-US,en;q=0.5");        httpRequestBase.setHeader("Accept-Charset", "ISO-8859-1,utf-8,gbk,gb2312;q=0.7,*;q=0.7");                // 配置请求的超时设置        RequestConfig requestConfig = RequestConfig.custom()                .setConnectionRequestTimeout(3000)                .setConnectTimeout(3000)                .setSocketTimeout(3000)                .build();        httpRequestBase.setConfig(requestConfig);            }    public static void main(String[] args) {        ConnectionSocketFactory plainsf = PlainConnectionSocketFactory.getSocketFactory();        LayeredConnectionSocketFactory sslsf = SSLConnectionSocketFactory.getSocketFactory();        Registry<ConnectionSocketFactory> registry = RegistryBuilder.<ConnectionSocketFactory>create()                .register("http", plainsf)                .register("https", sslsf)                .build();        PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager(registry);        // 将最大连接数增加到200        cm.setMaxTotal(200);        // 将每个路由基础的连接增加到20        cm.setDefaultMaxPerRoute(20);        // 将目标主机的最大连接数增加到50        HttpHost localhost = new HttpHost("http://blog.csdn.net/gaolu",80);        cm.setMaxPerRoute(new HttpRoute(localhost), 50);                //请求重试处理        HttpRequestRetryHandler httpRequestRetryHandler = new HttpRequestRetryHandler() {            public boolean retryRequest(IOException exception,int executionCount, HttpContext context) {                if (executionCount >= 5) {// 如果已经重试了5次，就放弃                                        return false;                }                if (exception instanceof NoHttpResponseException) {// 如果服务器丢掉了连接，那么就重试                                        return true;                }                if (exception instanceof SSLHandshakeException) {// 不要重试SSL握手异常                                        return false;                }                                if (exception instanceof InterruptedIOException) {// 超时                                        return false;                }                if (exception instanceof UnknownHostException) {// 目标服务器不可达                                        return false;                }                if (exception instanceof ConnectTimeoutException) {// 连接被拒绝                                        return false;                }                if (exception instanceof SSLException) {// ssl握手异常                                        return false;                }                                HttpClientContext clientContext = HttpClientContext.adapt(context);                HttpRequest request = clientContext.getRequest();                // 如果请求是幂等的，就再次尝试                if (!(request instanceof HttpEntityEnclosingRequest)) {                                        return true;                }                return false;            }        };                  CloseableHttpClient httpClient = HttpClients.custom()                .setConnectionManager(cm)                .setRetryHandler(httpRequestRetryHandler)                .build();        // URL列表数组        String[] urisToGet = {                         "http://blog.csdn.net/gaolu/article/details/48466059",                "http://blog.csdn.net/gaolu/article/details/48243103",                "http://blog.csdn.net/gaolu/article/details/47656987",                "http://blog.csdn.net/gaolu/article/details/47055029",                                "http://blog.csdn.net/gaolu/article/details/46400883",                "http://blog.csdn.net/gaolu/article/details/46359127",                "http://blog.csdn.net/gaolu/article/details/46224821",                "http://blog.csdn.net/gaolu/article/details/45305769",                                "http://blog.csdn.net/gaolu/article/details/43701763",                "http://blog.csdn.net/gaolu/article/details/43195449",                "http://blog.csdn.net/gaolu/article/details/42915521",                "http://blog.csdn.net/gaolu/article/details/41802319",                                "http://blog.csdn.net/gaolu/article/details/41045233",                "http://blog.csdn.net/gaolu/article/details/40395425",                "http://blog.csdn.net/gaolu/article/details/40047065",                "http://blog.csdn.net/gaolu/article/details/39891877",                                "http://blog.csdn.net/gaolu/article/details/39499073",                "http://blog.csdn.net/gaolu/article/details/39314327",                "http://blog.csdn.net/gaolu/article/details/38820809",                "http://blog.csdn.net/gaolu/article/details/38439375",        };                long start = System.currentTimeMillis();                try {            int pagecount = urisToGet.length;            ExecutorService executors = Executors.newFixedThreadPool(pagecount);            CountDownLatch countDownLatch = new CountDownLatch(pagecount);                     for(int i = 0; i< pagecount;i++){                HttpGet httpget = new HttpGet(urisToGet[i]);                config(httpget);                //启动线程抓取                executors.execute(new GetRunnable(httpClient,httpget,countDownLatch));            }            countDownLatch.await();            executors.shutdown();        } catch (InterruptedException e) {            e.printStackTrace();        } finally {            System.out.println("线程" + Thread.currentThread().getName() + "," + System.currentTimeMillis() + ", 所有线程已完成，开始进入下一步！");        }                        long end = System.currentTimeMillis();        System.out.println("consume -> " + (end - start));    }        static class GetRunnable implements Runnable {        private CountDownLatch countDownLatch;        private final CloseableHttpClient httpClient;        private final HttpGet httpget;                public GetRunnable(CloseableHttpClient httpClient, HttpGet httpget, CountDownLatch countDownLatch){            this.httpClient = httpClient;            this.httpget = httpget;                        this.countDownLatch = countDownLatch;        }        @Override        public void run() {            CloseableHttpResponse response = null;            try {                response = httpClient.execute(httpget,HttpClientContext.create());                HttpEntity entity = response.getEntity();                System.out.println(EntityUtils.toString(entity, "utf-8")) ;                EntityUtils.consume(entity);            } catch (IOException e) {                e.printStackTrace();            } finally {                countDownLatch.countDown();                                try {                    if(response != null)                        response.close();                } catch (IOException e) {                    e.printStackTrace();                }            }        }    }    }

主要参考文档:
http://free0007.iteye.com/blog/2012308