原文地址：http://www.cnblogs.com/junrong624/p/5416503.html

 1 import java.io.IOException;

 import java.io.InputStream;

 import java.net.InetSocketAddress;

 import java.net.Proxy;

 import java.net.URL;

 import java.net.URLConnection;

 import java.nio.charset.Charset;

 import java.util.HashMap;

 import java.util.Iterator;

 import java.util.Map;

 import java.io.BufferedReader;

 import java.io.InputStreamReader;

 /**<br>     * 批量代理IP有效检测<br>     *<br>     * @param IP<br>     * @param post<br>     */

 public static void createIPAddress(String ip,int port) {

         URL url = null;

         try {

         url = new URL("http://www.baidu.com");

         } catch (MalformedURLException e) {

         System.out.println("url invalidate");

         }

         InetSocketAddress addr = null;

         addr = new InetSocketAddress(ip, port);

         Proxy proxy = new Proxy(Proxy.Type.HTTP, addr); // http proxy

         InputStream in = null;

         try {

         URLConnection conn = url.openConnection(proxy);

         conn.setConnectTimeout();

         in = conn.getInputStream();

         } catch (Exception e) {

         System.out.println("ip " + ip + " is not aviable");//异常IP

         }

         String s = convertStreamToString(in);

         System.out.println(s);

         // System.out.println(s);

         if (s.indexOf("baidu") > ) {//有效IP

         System.out.println(ip + ":"+port+ " is ok");

         }

         }

     public static String convertStreamToString(InputStream is) {

         if (is == null)

         return "";

         BufferedReader reader = new BufferedReader(new InputStreamReader(is));

         StringBuilder sb = new StringBuilder();

         String line = null;

         try {

         while ((line = reader.readLine()) != null) {

         sb.append(line + "/n");

         }

         } catch (IOException e) {

         e.printStackTrace();

         } finally {

         try {

         is.close();

         } catch (IOException e) {

         e.printStackTrace();

         }

         }

         return sb.toString();

         }
         

 /**

      * 批量代理IP有效检测

      *

      * @param proxyIpMap

      * @param reqUrl

      */

     public static void checkProxyIp(Map<String, Integer> proxyIpMap, String reqUrl) {

           for (String proxyHost : proxyIpMap.keySet()) {

                 Integer proxyPort = proxyIpMap.get(proxyHost);

                 int statusCode = ;

                 try {

                       HttpClient httpClient = new HttpClient();

                       httpClient.getHostConfiguration().setProxy(proxyHost, proxyPort);

                       // 连接超时时间（默认10秒 10000ms） 单位毫秒（ms）

                       int connectionTimeout = ;

                       // 读取数据超时时间（默认30秒 30000ms） 单位毫秒（ms）

                       int soTimeout = ;

                       httpClient.getHttpConnectionManager().getParams().setConnectionTimeout(connectionTimeout);

                       httpClient.getHttpConnectionManager().getParams().setSoTimeout(soTimeout);

                       HttpMethod method = new GetMethod(reqUrl);

                       statusCode = httpClient.executeMethod(method);

                 } catch (Exception e) {

                     System.out.println("ip " + proxyHost + " is not aviable");

                 }

                 if(statusCode>){

                      System.out.format("%s:%s-->%sn", proxyHost, proxyPort,statusCode);

                 }

           }

     }