클라이언트와 서버 간의 연결이 종료 될 때까지는 더 이상 Jlabel 구성 요소를 편집 할 수 없습니다.

Question

두 개의 간단한 응용 프로그램을 사용하여 클라이언트 컴퓨터를 원격으로 종료, 다시 시작 및 로그 오프 할 수 있습니다. 클라이언트가 서버에 연결할 때, 연결이 종료 될 때까지 Jlabel 구성 요소 (statuslabel)는 더 이상 편집 할 수 없습니다 (서버 응용 프로그램을 닫음으로써) socket.isConnected 메서드를 사용하는 것과 같이 많은 것을 시도했지만 결과가 없습니다.

이

package homework_5.client; 

import java.awt.Color; 
import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStreamReader; 
import java.net.*; 
import javax.swing.JOptionPane; 

/** 
* 
* @author حسين 
*/ 
public class ClientSideGUI extends javax.swing.JFrame { 
Socket socket=null; 
String status; 
String recievedCommand; 
BufferedReader in=null; 
Process child; 
/** 
* Creates new form ClientSide 
*/ 
public ClientSideGUI() { 
    initComponents(); 

} 

/** 
* This method is called from within the constructor to initialize the form. 
* WARNING: Do NOT modify this code. The content of this method is always 
* regenerated by the Form Editor. 
*/ 
@SuppressWarnings("unchecked") 
// <editor-fold defaultstate="collapsed" desc="Generated Code"> 
private void initComponents() { 

    statuslabel = new javax.swing.JLabel(); 

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); 
    setTitle("Client."); 
    addWindowListener(new java.awt.event.WindowAdapter() { 
     public void windowOpened(java.awt.event.WindowEvent evt) { 
      formWindowOpened(evt); 
     } 
    }); 

    statuslabel.setFont(new java.awt.Font("Tahoma", 1, 36)); // NOI18N 
    statuslabel.setHorizontalAlignment(javax.swing.SwingConstants.CENTER); 

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); 
    getContentPane().setLayout(layout); 
    layout.setHorizontalGroup(
     layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
     .addGroup(layout.createSequentialGroup() 
      .addGap(19, 19, 19) 
      .addComponent(statuslabel, javax.swing.GroupLayout.PREFERRED_SIZE, 197, javax.swing.GroupLayout.PREFERRED_SIZE) 
      .addContainerGap(20, Short.MAX_VALUE)) 
    ); 
    layout.setVerticalGroup(
     layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
     .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup() 
      .addContainerGap(55, Short.MAX_VALUE) 
      .addComponent(statuslabel, javax.swing.GroupLayout.PREFERRED_SIZE, 40, javax.swing.GroupLayout.PREFERRED_SIZE) 
      .addGap(53, 53, 53)) 
    ); 

    pack(); 
}// </editor-fold> 

private void formWindowOpened(java.awt.event.WindowEvent evt) {         

    try{ 
      socket=new Socket("127.0.0.1", 1234); 
      status="Online"; 
     }catch(Exception e){status="Offline";} 


    //Display status @حسين 

        if(status.equals("Online")) 
        { 
        statuslabel.setForeground(Color.GREEN); 
        statuslabel.setText(status); 
        } 
        if(status.equals("Offline")) 
        { 
        statuslabel.setForeground(Color.RED); 
        statuslabel.setText(status); 
        } 


    //Getting the work done :) @حسين 
       { 
        while(status.equals("Online")) 
        { 
        try{ 
        in=new BufferedReader(new InputStreamReader(socket.getInputStream())); 
        recievedCommand=in.readLine(); 
         }catch(IOException e2){JOptionPane.showMessageDialog(rootPane,"Connected to server,\n but facing problems with recieving command\n Exception:"+e2.getClass().getName());} 




        if(recievedCommand.equals("shutdown -s")) 
         {try{  
          child=Runtime.getRuntime().exec(recievedCommand); 
          }catch(Exception e3){JOptionPane.showMessageDialog(rootPane, "Command Recieved but an error occured on local execution.\n Exception:"+e3.getClass().getName());} 
         } 

        if(recievedCommand.equals("shutdown -r")) 
         {try{  
          child=Runtime.getRuntime().exec(recievedCommand); 
          }catch(Exception e4){JOptionPane.showMessageDialog(rootPane, "Command Recieved but an error occured on local execution.\n Exception:"+e4.getClass().getName());} 
         } 

        if(recievedCommand.equals("shutdown -l")) 
         {try{  
          child=Runtime.getRuntime().exec(recievedCommand); 
          }catch(Exception e5){JOptionPane.showMessageDialog(rootPane, "Command Recieved but an error occured on local execution.\n Exception:"+e5.getClass().getName());} 
         } 



        } 

       } 



}         

/** 
* @param args the command line arguments 
*/ 
public static void main(String args[]) { 
    /* Set the Nimbus look and feel */ 
    //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) "> 
    /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel. 
    * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
    */ 
    try { 
     for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) { 
      if ("Nimbus".equals(info.getName())) { 
       javax.swing.UIManager.setLookAndFeel(info.getClassName()); 
       break; 
      } 
     } 
    } catch (ClassNotFoundException ex) { 
     java.util.logging.Logger.getLogger(ClientSideGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
    } catch (InstantiationException ex) { 
     java.util.logging.Logger.getLogger(ClientSideGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
    } catch (IllegalAccessException ex) { 
     java.util.logging.Logger.getLogger(ClientSideGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
    } catch (javax.swing.UnsupportedLookAndFeelException ex) { 
     java.util.logging.Logger.getLogger(ClientSideGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
    } 
    //</editor-fold> 

    /* Create and display the form */ 
    java.awt.EventQueue.invokeLater(new Runnable() { 
     public void run() { 
      new ClientSideGUI().setVisible(true); 
     } 
    }); 
} 
// Variables declaration - do not modify 
public javax.swing.JLabel statuslabel; 
// End of variables declaration 
} 

Answer 1

귀하의 소켓 연결이 Event Dispatch Thread(EDT)을 차단하므로 GUI 자체를 칠 수 없습니다 다음은 클라이언트 코드입니다. 소켓 연결을 수행하려면 별도의 스레드를 만들어야합니다.

자세한 내용 및 Swing Worker을 사용하는 솔루션에 대한 내용은 Concurrency의 스윙 튜토리얼의 섹션을 참조하십시오.