writeUTF（）方法导致java.net.SocketException：Socket关闭

Question

我是新设计客户端和服务器的JAVA。现在我正在尝试编写一个由GUI呈现的客户端来与我的字典服务器进行通信。客户端可以添加，删除或查询单词（三个按钮）。在客户端的代码，如下：

public class DictionaryClient { 

    private static String ip; 
    private static int port; 
    private DataInputStream input = null; 
    private DataOutputStream output = null; 

    public static void main(String[] args) { 

     // IP and port 
     ip = args[0]; 
     port = Integer.parseInt(args[1]); 

     DictionaryClient client = new DictionaryClient(); 
     client.run(ip, port); 
    } 

    public void run(String ip, int port){ 

     GUI g = new GUI(); 

     try(Socket socket = new Socket(ip, port);) { 

      // Output and Input Stream 
      input = new DataInputStream(socket.getInputStream()); 
      output = new DataOutputStream(socket.getOutputStream()); 

      g.start(); 

      JButton c2 = (JButton)g.getComponent(2); 
      JButton c3 = (JButton)g.getComponent(3); 
      JButton c4 = (JButton)g.getComponent(4); 

      c2.addActionListener(new ButtonAdd(g)); 
      c3.addActionListener(new ButtonRemove(g)); 
      c4.addActionListener(new ButtonQuery(g)); 

     } 
     catch (UnknownHostException e) { 
      e.printStackTrace(); 
     } 
     catch (IOException e) { 
      e.printStackTrace(); 
     } 
    } 


    //Button: Add 
    public class ButtonAdd implements ActionListener{ 

     GUI g = null; 


     //Constructor 
     public ButtonAdd(GUI g){ 
      this.g = g; 
     } 

     public void actionPerformed(ActionEvent event) { 
      JTextField t1 = (JTextField)g.getComponent(1); 
      JLabel t6 = (JLabel)g.getComponent(6); 
      String word = t1.getText(); 
      String definition = t6.getText(); 
      JLabel t5 = (JLabel)g.getComponent(5); 

      try { 
       output.writeInt(1); 
       output.writeUTF(word); 
       output.writeUTF(definition); 
       output.flush(); 

       String message = input.readUTF(); 
       t5.setText("Status: "); 
       t6.setText(message); 
      } 
      catch (IOException e) { 
       e.printStackTrace(); 
      } 

     } 
    } 

    //Button: Remove 
    public class ButtonRemove implements ActionListener{ 

     GUI g = null; 


     //Constructor 
     public ButtonRemove(GUI g){ 
      this.g = g; 
     } 

     public void actionPerformed(ActionEvent event) { 
      JTextField t1 = (JTextField)g.getComponent(1); 
      String word = t1.getText(); 
      JLabel t6 = (JLabel)g.getComponent(6); 
      JLabel t5 = (JLabel)g.getComponent(5); 

      try { 
       output.writeInt(2); 
       output.writeUTF(word); 
       output.flush(); 

       t5.setText("Status: "); 
       String message = input.readUTF(); 
       t6.setText(message); 
      } 
      catch (IOException e) { 
       e.printStackTrace(); 
      } 

     } 
    } 

    //Button: Query 
    public class ButtonQuery implements ActionListener{ 

     GUI g = null; 

     //Constructor 
     public ButtonQuery(GUI g){ 
      this.g = g; 
     } 

     public void actionPerformed(ActionEvent event) { 

      JTextField t1 = (JTextField)g.getComponent(1); 
      String word = t1.getText(); 
      JLabel t5 = (JLabel)g.getComponent(5); 
      JLabel t6 = (JLabel)g.getComponent(6); 

      try { 
       output.writeInt(3); 
       output.writeUTF(word); 
       output.flush(); 

       String message = input.readUTF(); 
       t6.setText(message); 
       t5.setText("Definition: "); 
      } catch (IOException e) { 
       e.printStackTrace(); 
      } 
     } 
    } 

} 

然而，当我每次上的三个按钮中的一个点击时，它总是POP操作了异常：java.net.SocketException: Socket closed就行试图将消息发送到服务器，如output.writeInt(1)或output.writeUTF(word)等

我完全不知道怎么回事。为什么套接字关闭？我甚至在我的代码中没有任何close()。有人有任何想法吗？非常感谢！

Answer 1

我想你可能想看看你的服务器端代码。连接后，插座可能会在该侧闭合。