private static String getPageContent(String httpPath, String waitForString) throws IOException {
    Socket socket = null;
    if (Settings.getInstance().isUseProxy()) {
      socket = new Socket(Settings.getInstance().getProxyHost(), Settings.getInstance().getProxyPort());
    }

    socket.setSoTimeout(Settings.getInstance().getSocketTimeout());

    PrintWriter pw = new PrintWriter(socket.getOutputStream());
    InputStreamReader isr = new InputStreamReader(socket.getInputStream());

    String request = getHeader(httpPath);

    pw.println(request);
    pw.flush();

    String answer = "";
    int readed;
    char[] buf = new char[ 512 ];

    boolean found = false;
    while ((readed = isr.read(buf)) != - 1 ) {
      String temp = String.copyValueOf(buf,  0 , readed);
      answer += temp;
      if (waitForString != null) {
        if (answer.lastIndexOf(waitForString) != - 1 ) {
          found = true;
          break;
        }
      }
    }

    pw.close();
    isr.close();

    socket.close();

    return answer;
  }

  private static String getHeader(String url) {
    String header = "GET " + url + " HTTP/1.1\r\n";
    header += "Host: www.sql.ru\r\n" +
            "User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.0.2) Gecko/20030208 Netscape/7.02\r\n" +
            "Accept: application/x-shockwave-flash,text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,video/x-mng,image/png,image/jpeg,image/gif;q=0.2,text/css,*/*;q=0.1\r\n" +
            "Accept-Language: ru, en-us;q=0.66, en;q=0.33\r\n" +
            "Referer: http://www.sql.ru\r\n" +
            "Cookie: ASP.NET_SessionId=SKIPPED\r\n" +
            "Proxy-Connection: keep-alive\r\n";
    return header;
  }

 
Соединение через прокси сервер 
 --------------------------------------------------------------------------------
 


java -DproxySet=true -DproxyHost=myProxyServer.come -DproxyPort= 80  MyJavaApp
Или :
import java.util.Properties;
...

Properties systemSettings = System.getProperties();
systemSettings.put("proxySet", "true");
systemSettings.put("proxyHost", "myProxyServer.com");
systemSettings.put("proxyPort", "80");
System.setProperties(systemSettings);

// jdk1. 3  or better, the names have changed eg.
// Properties systemSettings = System.getProperties();
// systemSettings.put("http.proxyHost","myProxyServer.com") ;
// systemSettings.put("http.proxyPort",  80 ) ;
Аутентификация :
Properties systemSettings = System.getProperties();
...
System.setProperties(systemSettings);

URL url=new URL("http://someserver/somepage");
URLConnection uc = url.openConnection ();
String encoded = new String(Base64.base64Encode(new String("username:password").getBytes()));
uc.setRequestProperty("Proxy-Authorization", "Basic " + encoded);
uc.connect();


user_pref("security.lower_java_network_security_by_trusting_proxies"), true);
  Properties propSystem = System.getProperties();
  // Sun VM
  propSystem.put("proxySet", "true");
  propSystem.put("proxyHost", "myProxyServer.com");
  propSystem.put("proxyPort", "80");

  // Microsoft VM
  propSystem.put("firewallSet", "true");
  propSystem.put("firewallHost", "myProxyServer.com");
  propSystem.put("firewallPort", "80");
  propSystem.put("http.proxyHost", "myProxyServer.com");
  propSystem.put("http.proxyPort", "80");