java.net.SocketTimeoutException的异常情况：连接超时

Question

您好，我无法理解一个时刻。在一个简单的应用程序下面的代码是完全应验：

 /** 
     * 
     * @author AKhusnutdinov 
     */ 
    public class JavaApplication12 { 

     /** 
      * @param args the command line arguments 
      */ 
     public static void main(String[] args) { 
      Date startDate = new Date(); 
      String hostname = "ihtik.lib.ru"; 
      int port = 80; 

      Socket socket = null; 
      BufferedReader reader = null; 

      try { 
       socket = new Socket(); 
       socket.setSoTimeout(30000); 
       socket.connect(new InetSocketAddress(hostname, port), 
30000); 
       String writer = "GET /2011.06.03_prislan.ihtiku/ 
HTTP/1.1\r\n" 
         + "Host: " + hostname + "\r\n" 
         + "Accept: */*\r\n" 
         + "User-Agent: Java\r\n" 
         + "\r\n"; 

socket.getOutputStream().write(writer.getBytes("UTF-8")); 
       socket.getOutputStream().flush(); 

       reader = new BufferedReader(new 
InputStreamReader(socket.getInputStream())); 
       for (String line; (line = reader.readLine()) != null;) 
{ 
    //    if (line.isEmpty()) { 
    //     break; // Stop when headers are completed. 
We're not interested in all the HTML. 
    //    } 
        System.out.println(line); 
       } 
      } catch (Exception ex) { 
      } finally { 
       if (reader != null) { 
        try { 
         reader.close(); 
        } catch (IOException logOrIgnore) { 
        } 
       } 

       if (socket != null) { 
        try { 
         socket.close(); 
        } catch (IOException logOrIgnore) { 
        } 
       } 
      } 

      Date endDate = new Date(); 
      System.out.println(endDate.getTime() - 
startDate.getTime()); 
     } 
    } 

但是，在一个GUI应用程序，这是在NetBeans（桌面应用程序的Java摆动）创造了不处理相同的代码，但它给出了一个错误：

run: java.net.SocketTimeoutException: Connect timed out 
    at 
java.net.SocksSocketImpl.readSocksReply(SocksSocketImpl.java:125) 
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:459) 
    at java.net.Socket.connect(Socket.java:579) 
    at 
desktopapplication1.DesktopApplication1View.<init(DesktopApplication1View.java:46) 
    at 
desktopapplication1.DesktopApplication1.startup(DesktopApplication1.java:19) 
    at 
org.jdesktop.application.Application$1.run(Application.java:171) 
    at 
java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251) 
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:705) 
    at java.awt.EventQueue.access$000(EventQueue.java:101) 
    at java.awt.EventQueue$3.run(EventQueue.java:666) 
    at java.awt.EventQueue$3.run(EventQueue.java:664) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at 
java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76) 
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:675) 
    at 
java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:211) 
    at 
java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128) 
    at 
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117) 
    at 
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113) 
    at 
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105) 
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:90) 
ПОСТРОЕНИЕ УСПЕШНО ЗАВЕРШЕНО (общее время: 39 секунд) 

部分代码的GUI应用程序：

DesktopApplication1View extends FrameView { 

    public DesktopApplication1View(SingleFrameApplication app) { 
     super(app); 

     initComponents(); 

     Date startDate = new Date(); 
     String hostname = "ihtik.lib.ru"; 
     int portt = 80; 

     Socket socket = null; 
     BufferedReader reader = null; 
     try { 
      socket = new Socket(); 
      socket.setSoTimeout(30000); 
      socket.connect(new InetSocketAddress(hostname, portt), 
30000); 
      String writer = "GET /2011.06.03_prislan.ihtiku/ 
HTTP/1.1\r\n" 
        + "Host: " + hostname + "\r\n" 
        + "Accept: */*\r\n" 
        + "User-Agent: Java\r\n" 
        + "\r\n"; 
      socket.getOutputStream().write(writer.getBytes("UTF-8")); 
      socket.getOutputStream().flush(); 

      reader = new BufferedReader(new 
InputStreamReader(socket.getInputStream())); 
      for (String line; (line = reader.readLine()) != null;) { 
//    if (line.isEmpty()) { //     break; 
// Stop when headers are completed. We're not interested in all the 
HTML. //    } 
       System.out.println(line); 
      } 
      reader.close(); 
      socket.close(); 
     } catch (Exception ex) { 
      ex.printStackTrace(); 
     } 

     // status bar initialization - message timeout, idle icon and 
busy animation, etc 
     ResourceMap resourceMap = getResourceMap(); 
     int messageTimeout = 
resourceMap.getInteger("StatusBar.messageTimeout"); 
     messageTimer = new Timer(messageTimeout, new ActionListener() 
{ 
      public void actionPerformed(ActionEvent e) { 
       statusMessageLabel.setText(""); 
      } 
     }); 

为什么错误？

Answer 1

您正在EventQueue上运行您的代码。有关详细信息，请参阅here。

代码需要移动到一个单独的线程，只是做invokeLater()仍然会运行事件线程上的代码。