HttpClient多线程调用并返回值

新开发了一个汇总功能，为了组合数据的方便，所以接口提供非常小的粒度；但是因汇总是有多个时间、地理跨度、且查询数据量比较大，结果是200个请求查询时间非常缓慢，达到了413854毫秒，龟速！！！
研究了下HttpClient的多线程调用，经多线程实现后，200个请求耗时61382毫秒，效果非常明显。以下是封装的HttpClientThreadUtil.java工具类：

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import com.alibaba.druid.support.logging.Log; import com.alibaba.druid.support.logging.LogFactory; import org.apache.http.HttpEntity; import org.apache.http.NameValuePair; 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.impl.client.CloseableHttpClient; import org.apache.http.impl.client.HttpClients; import org.apache.http.impl.conn.PoolingHttpClientConnectionManager; import org.apache.http.message.BasicNameValuePair; import org.apache.http.protocol.BasicHttpContext; import org.apache.http.protocol.HttpContext; import org.apache.http.util.EntityUtils;   import java.io.IOException; import java.io.UnsupportedEncodingException; import java.util.ArrayList; import java.util.List; import java.util.Map; import java.util.concurrent.Callable; import java.util.concurrent.ConcurrentHashMap;   /** * Description: * Author: CharlesSong * Date  : 2015/6/4 */ public class HttpClientTreadUtil {       private static Log log = LogFactory.getLog(HttpClientTreadUtil.class);     /**      * reqList中Map的格式{url:'请求地址',params:{请求参数},encode:'编码'}      * @param reqList      * @return      */     public static String[] threadPost(List<Map<String,Object>> reqList){         System.out.println("post共执行"+reqList.size()+"个请求");         String[] results=new String[reqList.size()];         PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager();         //设置线程数最大100,如果超过100为请求个数         cm.setMaxTotal(reqList.size()>100?reqList.size():100);         CloseableHttpClient httpclient = HttpClients.custom()                 .setConnectionManager(cm)                 .build();         try{             PostThread[] postThreads=new PostThread[reqList.size()];             for (int i = 0; i < reqList.size(); i++) {                 Map<String,Object> req=reqList.get(i);                 HttpPost post=new HttpPost((String) req.get("url"));                 postThreads[i]=new PostThread(httpclient,post, (Map<String, Object>) req.get("params"), (String) req.get("encode"),i+1);             }             //执行线程             for(PostThread pt:postThreads){                 pt.start();             }             //设置所有线程执行完毕之后再执行后续代码             for (PostThread pt : postThreads) {                 pt.join();             }             for (int i = 0; i < reqList.size(); i++) {                 results[i]=postThreads[i].call();             }           }catch (Exception e){             e.printStackTrace();             log.debug("多线程post方法异常："+e.getMessage());         }finally {             try {                 httpclient.close();             } catch (IOException e) {                 e.printStackTrace();             }         }         System.out.println(reqList.size()+"个线程的结果为:"+results.length+"个，明细:::"+results);         return results;     }       /**      * reqList中Map的格式{url:'请求地址',params:{请求参数},encode:'编码'}      * @param reqList      * @return      */     public static String[] threadGet(List<Map<String, Object>> reqList) {         System.out.println("get共执行" + reqList.size() + "个请求");         String[] results = new String[reqList.size()];         PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager();         //设置线程数最大100,如果超过100为请求个数         cm.setMaxTotal(reqList.size() > 100 ? reqList.size() : 100);         CloseableHttpClient httpclient = HttpClients.custom()                 .setConnectionManager(cm)                 .build();         try {             GetThread[] getThreads = new GetThread[reqList.size()];             for (int i = 0; i < reqList.size(); i++) {                 Map<String, Object> req = reqList.get(i);                 HttpGet get = new HttpGet((String) req.get("url"));                 getThreads[i] = new GetThread(httpclient, get, i + 1);             }             //执行线程             for (GetThread gt : getThreads) {                 gt.start();             }             //设置所有线程执行完毕之后再执行后续代码             for (GetThread gt : getThreads) {                 gt.join();             }             for (int i = 0; i < reqList.size(); i++) {                 results[i] = getThreads[i].call();             }           } catch (Exception e) {             e.printStackTrace();             log.debug("多线程get方法异常：" + e.getMessage());         } finally {             try {                 httpclient.close();             } catch (IOException e) {                 e.printStackTrace();             }         }         return results;     }         /**      * 实现Callable回调接口      */     static class PostThread extends Thread implements Callable<String>{           private final CloseableHttpClient httpClient;         private final HttpContext context;         private final HttpPost httppost;         private final int id;         private String result = null;         public PostThread(CloseableHttpClient httpClient, HttpPost httppost, Map<String, Object> params,String encode,int id) throws UnsupportedEncodingException {             //设置超时时间             RequestConfig requestConfig = RequestConfig.custom()                     .setConnectionRequestTimeout(60000)                     .setConnectTimeout(60000)                     .setSocketTimeout(60000)                     .build();             httppost.setConfig(requestConfig);             List<NameValuePair> pairs = null;             if (params != null && !params.isEmpty()) {                 pairs = new ArrayList<NameValuePair>(params.size());                 for (Map.Entry<String, Object> entry : params.entrySet()) {                     Object value = entry.getValue();                     if (value != null) {                         pairs.add(new BasicNameValuePair(entry.getKey(), value                                 .toString()));                     }                 }             }             if (pairs != null && pairs.size() > 0) {                 encode = encode == null ? "UTF-8" : encode;                 httppost.setEntity(new UrlEncodedFormEntity(pairs, encode));             }             this.httpClient = httpClient;             this.context = new BasicHttpContext();             this.httppost = httppost;             this.id = id;         }           @Override         public void run() {             try {                 CloseableHttpResponse response = httpClient.execute(httppost, context);                 try {                     // get the response body as an array of bytes                     HttpEntity entity = response.getEntity();                     if (entity != null) {                         result= EntityUtils.toString(entity);                         System.out.println(id+"：：：执行结果：：："+result);                     }                 } finally {                     response.close();                 }             } catch (Exception e) {                 log.error(id + " - error: " + e);             }         }           @Override         public String call() throws Exception {             return result;         }     }       /**      * A thread that performs a GET.      */     static class GetThread extends Thread implements Callable<String> {           private final CloseableHttpClient httpClient;         private final HttpContext context;         private final HttpGet httpget;         private final int id;         private String result = null;           public GetThread(CloseableHttpClient httpClient, HttpGet httpget, int id) {             this.httpClient = httpClient;             this.context = new BasicHttpContext();             this.httpget = httpget;             this.id = id;         }           /**          * Executes the GetMethod and prints some status information.          */         @Override         public void run() {             try {                 System.out.println(id + " - about to get something from " + httpget.getURI());                 CloseableHttpResponse response = httpClient.execute(httpget, context);                 try {                     System.out.println(id + " - get executed");                     // get the response body as an array of bytes                     HttpEntity entity = response.getEntity();                     if (entity != null) {                         result = EntityUtils.toString(entity);                     }                 } finally {                     response.close();                 }             } catch (Exception e) {                 System.out.println(id + " - error: " + e);             }         }           @Override         public String call() throws Exception {             return result;         }     }       }

注意：
1. 需要HttpClient 4.3.X以上版本支持
2. threadGet方法未测试，threadPost方法实测没有发现问题