通过代理连接到Facebook服务器时出错

Question

我在从代理服务器后面连接gtalk / facebook服务器时遇到问题。在doPost下的loginservlet中，我在与服务器建立连接之前指定了代理设置。代码如下：

package web;

import java.io.IOException;
import java.io.PrintWriter;

  import javax.servlet.ServletException;
  import javax.servlet.http.HttpServlet;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;

  import org.jivesoftware.smack.ConnectionConfiguration;
  import org.jivesoftware.smack.SASLAuthentication;
  import org.jivesoftware.smack.XMPPConnection;
  import org.jivesoftware.smack.XMPPException;
  import org.jivesoftware.smack.proxy.ProxyInfo;

  import dao.MySASLDigestMD5Mechanism;

   public class LoginFacebookServlet extends HttpServlet {
private static final long serialVersionUID = 1L;

   public LoginFacebookServlet() {
    super();

  }
 XMPPConnection connection;
/**
 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
 */
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    String userName = request.getParameter("usrnm_fb");
    String password = request.getParameter("password_fb");

    response.setContentType("text/html");
    PrintWriter pw=response.getWriter();

    SASLAuthentication.registerSASLMechanism("DIGEST-MD5", MySASLDigestMD5Mechanism.class);
    //SASLAuthentication.supportSASLMechanism("DIGEST-MD5", 0);

  ProxyInfo proxyInfo = new ProxyInfo(ProxyInfo.ProxyType.HTTP,"proxy.xxx.com"  "talk.google.com",   port, "username", "password");
    ConnectionConfiguration config = new ConnectionConfiguration("chat.facebook.com",5222,proxyInfo);
    connection = new XMPPConnection(config);
   config.setSASLAuthenticationEnabled(true);
    try {
        connection.connect();
    } catch (XMPPException e) {
        e.printStackTrace();
    }
    try {
        connection.login(userName, password);
    } catch (XMPPException e) {
        e.printStackTrace();
    }
    System.out.println(connection.isAuthenticated());
   // System.out.println("Welcome!!you are now connected to facebook");
}

}

当我运行应用程序时，它仍然给我500状态错误。以下是堆栈跟踪

 XMPPError connecting to chat.facebook.com:5222.: remote-server-error(502) XMPPError      connecting to chat.facebook.com:5222.
  -- caused by: java.net.ConnectException: Connection timed out: connect
at org.jivesoftware.smack.XMPPConnection.connectUsingConfiguration(XMPPConnection.java:900)
at org.jivesoftware.smack.XMPPConnection.connect(XMPPConnection.java:1415)
at web.LoginFacebookServlet.doPost(LoginFacebookServlet.java:52)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:619)
Nested Exception: 
java.net.ConnectException: Connection timed out: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
at java.net.Socket.connect(Socket.java:529)
at java.net.Socket.connect(Socket.java:478)
at              org.jivesoftware.smack.proxy.DirectSocketFactory.createSocket(DirectSocketFactory.java:28)
at org.jivesoftware.smack.XMPPConnection.connectUsingConfiguration(XMPPConnection.java:888)
at org.jivesoftware.smack.XMPPConnection.connect(XMPPConnection.java:1415)
at web.LoginFacebookServlet.doPost(LoginFacebookServlet.java:52)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at       org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:619)
 Apr 26, 2011 11:32:24 AM org.apache.catalina.core.StandardWrapperValve invoke
 SEVERE: Servlet.service() for servlet LoginFacebookServlet threw exception
java.lang.IllegalStateException: Not connected to server.
at org.jivesoftware.smack.XMPPConnection.login(XMPPConnection.java:382)
at org.jivesoftware.smack.XMPPConnection.login(XMPPConnection.java:349)
at web.LoginFacebookServlet.doPost(LoginFacebookServlet.java:57)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:619)

我查看是否有更多东西可以通过传递代理添加，但我无法理解我哪里出错了？

谢谢：）

Answer 1

XMPP！= HTTP因此没有理由期望XMPP客户端将使用HTTP代理。 但是，似乎Smack已经添加了HTTP代理支持（除了之前的SOCKS4和SOCKS5代理支持 ）。 ConnectionConfiguration可以接受ProxyInfo参数。

据我所知， JavaDocs就是你需要做的：

ProxyInfo proxyInfo = new ProxyInfo(ProxyInfo.ProxyType.HTTP, "proxy.xxx.com", 8080, "username", "password")
ConnectionConfiguration config = new ConnectionConfiguration("facebook.com", 5222, proxyInfo);
XMPPConnection conn = new XMPPConnection(config);
conn.connect();

此外，对于将来的问题，请注意

1. 虽然您的问题被标记为'Smack'，但您没有发布Smack特定代码。 显示使用URLConnection是没有意义的，因为这不是您的连接失败的地方。
2. 您的问题标题表示Google Talk，但其他所有内容都指Facebook。 这是令人困惑和不清楚的问题或代码，而不是你实际使用的代码很可能会导致你和其他成员的沮丧。 您应尽可能发布SSCCE 。