Apache HttpClient 连接池的使用，apachehttpclient,import java.

Apache HttpClient 连接池的使用，apachehttpclient,import java.

import java.io.IOException;import java.util.Random;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.HttpStatus;import org.apache.http.HttpVersion;import org.apache.http.client.ClientProtocolException;import org.apache.http.client.HttpClient;import org.apache.http.client.methods.HttpGet;import org.apache.http.conn.scheme.PlainSocketFactory;import org.apache.http.conn.scheme.Scheme;import org.apache.http.conn.scheme.SchemeRegistry;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager;import org.apache.http.params.BasicHttpParams;import org.apache.http.params.CoreConnectionPNames;import org.apache.http.params.CoreProtocolPNames;import org.apache.http.params.HttpParams;public class HttpClientUtils { private static final Log log = LogFactory.getLog(HttpClientUtils.class); private static ThreadSafeClientConnManager cm = null; static {  SchemeRegistry schemeRegistry = new SchemeRegistry();  schemeRegistry.register(new Scheme("http", 80, PlainSocketFactory    .getSocketFactory()));  cm = new ThreadSafeClientConnManager(schemeRegistry);  try {   int maxTotal = 100;   cm.setMaxTotal(maxTotal);  } catch (NumberFormatException e) {   log.error(     "Key[httpclient.max_total] Not Found in systemConfig.properties",     e);  }  // 每条通道的并发连接数设置（连接池）  try {   int defaultMaxConnection = 50;   cm.setDefaultMaxPerRoute(defaultMaxConnection);  } catch (NumberFormatException e) {   log.error(     "Key[httpclient.default_max_connection] Not Found in systemConfig.properties",     e);  } } public static HttpClient getHttpClient() {  HttpParams params = new BasicHttpParams();  params.setParameter(CoreProtocolPNames.PROTOCOL_VERSION,    HttpVersion.HTTP_1_1);  params.setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, 3000); // 3000ms  return new DefaultHttpClient(cm, params); } public static void release() {  if (cm != null) {   cm.shutdown();  } } public static void main(String[] args) throws ClientProtocolException,   IOException {  Random r = new Random();  for (int i = 0; i < 10; i++) {   long l1 = System.currentTimeMillis();   HttpClient client = getHttpClient();   HttpGet get = new HttpGet("http://www.baidu.com/s?wd="     + r.nextInt(5000));   HttpResponse response = client.execute(get);   if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {    HttpEntity entity = response.getEntity();    long l = entity.getContentLength();    System.out.println("回应结果长度:" + l);   }   System.out.println("查询耗时" + (System.currentTimeMillis() - l1));  } }}