httpclient pool帮助类

      摘自爬虫类  用于频繁请求减少网络消耗  

import java.io.IOException;
import java.io.InterruptedIOException;
import java.io.UnsupportedEncodingException;
import java.net.UnknownHostException;
import java.util.*;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

import javax.net.ssl.SSLException;
import javax.net.ssl.SSLHandshakeException;

import com.alibaba.fastjson.JSONObject;
import org.apache.commons.lang3.ClassUtils;
import org.apache.http.HttpEntity;
import org.apache.http.HttpEntityEnclosingRequest;
import org.apache.http.HttpHost;
import org.apache.http.HttpRequest;
import org.apache.http.NameValuePair;
import org.apache.http.NoHttpResponseException;
import org.apache.http.client.HttpRequestRetryHandler;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpRequestBase;
import org.apache.http.client.protocol.HttpClientContext;
import org.apache.http.conn.ConnectTimeoutException;
import org.apache.http.conn.routing.HttpRoute;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.DefaultConnectionKeepAliveStrategy;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.http.protocol.HttpContext;
import org.apache.http.util.EntityUtils;

/**
 * http请求池
 */
public class HttpClientUtil {
   //超时时间
    static final int timeOut = 6 * 1000;
   //httpclient
    private static CloseableHttpClient httpClient = null;
   //锁校验
    private final static Object syncLock = new Object();

    private static void config(HttpRequestBase httpRequestBase) {
//        // 设置Header等
//         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(timeOut)
                .setConnectTimeout(timeOut).setSocketTimeout(timeOut).build();
        httpRequestBase.setConfig(requestConfig);
    }

    /**
     * 获取HttpClient对象
     *
     * @return
     * @author zyz
     * @create
     */
    public static CloseableHttpClient getHttpClient(String url) {
        String hostname = url.split("/")[2];
        int port = 80;
        if (hostname.contains(":")) {
            String[] arr = hostname.split(":");
            hostname = arr[0];
            port = Integer.parseInt(arr[1]);
        }
        if (httpClient == null) {
            synchronized (syncLock) {
                if (httpClient == null) {
                    System.out.println("创建httpclient"+System.currentTimeMillis());
                    httpClient = createHttpClient(40, 40, 100, hostname, port);
                }
            }
        }
        return httpClient;
    }

    /**
     * 创建httpclient对象
     * @param maxTotal 最大连接
     * @param maxPerRoute 每个路由最大连接数
     * @param maxRoute
     * @param hostname
     * @param port
     * @return
     */
    public static CloseableHttpClient createHttpClient(int maxTotal,
                                                       int maxPerRoute, int maxRoute, String hostname, int port) {
//        ConnectionSocketFactory plainsf = PlainConnectionSocketFactory
//                .getSocketFactory();
//        LayeredConnectionSocketFactory sslsf = SSLConnectionSocketFactory
//                .getSocketFactory();
//        Registry<ConnectionSocketFactory> registry = RegistryBuilder
//                .<ConnectionSocketFactory> create().register("http", plainsf)
//                .register("https", sslsf).build();
        //长连接保持30秒
        PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager(30, TimeUnit.SECONDS);
        // 将最大连接数增加
        cm.setMaxTotal(maxTotal);
        // 将每个路由基础的连接增加
        cm.setDefaultMaxPerRoute(maxPerRoute);
        HttpHost httpHost = new HttpHost(hostname, port);
        // 将目标主机的最大连接数增加
        cm.setMaxPerRoute(new HttpRoute(httpHost), maxRoute);
        //关闭无效链接
        cm.closeExpiredConnections();
        // 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;
            }
        };
         //构建httpclient
        CloseableHttpClient httpClient = HttpClients.custom()
                .setConnectionManager(cm)
                .setRetryHandler(httpRequestRetryHandler)
                //保持长连接
                .setKeepAliveStrategy(new DefaultConnectionKeepAliveStrategy()).build();
        return httpClient;
    }

    /**
     * 设置post请求参数
     * @param httpost
     * @param params 参数
     */
//    private static void setPostParams(HttpPost httpost,
//                                      Map<String, Object> params) {
//        List<NameValuePair> nvps = new ArrayList<NameValuePair>();
//        NameValuePair pair1 = new BasicNameValuePair("Content_type","application/json");
//        nvps.add(pair1);
//        Set<String> keySet = params.keySet();
//        for (String key : keySet) {
//            nvps.add(new BasicNameValuePair(key, params.get(key).toString()));
//        }
//        try {
//            httpost.setEntity(new UrlEncodedFormEntity(nvps, "UTF-8"));
//        } catch (UnsupportedEncodingException e) {
//            e.printStackTrace();
//        }
//    }
    private static void setPostParams(HttpPost httpost,Map<String, Object> params,String contentType)  {
        try {
            HttpEntity  httpEntity= new StringEntity(JSONObject.toJSONString(params),contentType,"UTF-8");
            httpost.setEntity(httpEntity);
        } catch (Exception e) {
        }
    }


    /**
     * post 获取内容
     * @param url
     * @param params
     * @return
     * @throws Exception
     */
    public static String post(String url, Map<String, Object> params) throws Exception {
        HttpPost httppost = new HttpPost(url);
        config(httppost);
        httppost.setHeader("Content_type","application/json");
        setPostParams(httppost, params,"application/json");
        CloseableHttpResponse closeableHttpResponse = null;
        try {

            closeableHttpResponse = getHttpClient(url).execute(httppost,
                    HttpClientContext.create());
        //    int statusCode = closeableHttpResponse.getStatusLine().getStatusCode();
                HttpEntity entity = closeableHttpResponse.getEntity();
                String result = EntityUtils.toString(entity, "utf-8");
                EntityUtils.consume(entity);
                return result;
        } catch (Exception e) {
            throw e;
        } finally {
            try {
                if (closeableHttpResponse != null)
                    closeableHttpResponse.close();
                httppost.releaseConnection();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * get 请求url 获取数据
     * @param url
     * @return
     */
    public static String get(String url) {
        HttpGet httpget = new HttpGet(url);
        config(httpget);
        CloseableHttpResponse response = null;
        try {
            response = getHttpClient(url).execute(httpget,
                    HttpClientContext.create());
            HttpEntity entity = response.getEntity();
            String result = EntityUtils.toString(entity, "utf-8");
            EntityUtils.consume(entity);
            return result;
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (response != null)
                    response.close();
                httpget.releaseConnection();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return null;
    }

    public static void main(String[] args) throws Exception{
        Map<String,Object> map = new HashMap<String,Object>();
        map.put("__query_select_id","fam.CarpayMapper10.33.selectCarPayNotBalancedDetail");
        map.put("d1","2017-12-01 23:59:59");
        map.put("d2","2017-12-02 23:59:59");
        map.put("page",1);
        map.put("pageSize",20);
        String url  ="http://bug-dus.kxtx.cn/kxtx-dus/dus/controller/queryjson";
//        // URL列表数组
//        for (int i = 0; i <1000 ; i++) {
//            String  string  =post("http://bug-dus.kxtx.cn/kxtx-dus/dus/controller/queryjson",map);
//            System.out.println(string);
//        }

        long start = System.currentTimeMillis();
        try {
            ExecutorService executors = Executors.newFixedThreadPool(1000);
            CountDownLatch countDownLatch = new CountDownLatch(1000);
            for (int i = 0; i <1000 ; i++) {
                executors.execute(new GetRunnable(url,countDownLatch,map));
            }
            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 String url;
        private Map<String,Object> map;

        public GetRunnable(String url, CountDownLatch countDownLatch,Map<String,Object> map)  {
            this.url = url;
            this.countDownLatch = countDownLatch;
            this.map = map;
        }

        public void run() {
            try {
                String  result = HttpClientUtil.post(url,map);
                JSONObject obj = JSONObject.parseObject(result);
                String data = obj.getString("data");
                System.out.println("result="+result);
                System.out.println("data="+data);
            }catch (Exception e){

            }finally {
                countDownLatch.countDown();
            }
        }
    }
}