當我按下JButton時，我的框架卡住了，爲什麼？ GUI

Question

我必須編寫一個java客戶端 - 服務器應用程序，模擬車庫裏的汽車。在客戶端，我將有一個帶2個按鈕的小框架 - 一個進入車庫，另一個離開。在下面的代碼中，你可以看到我做了什麼。但是當我運行這個，並按下輸入按鈕我的框架卡住了。任何想法在我的代碼中有什麼錯誤？程序沒有產生錯誤。

import java.awt.FlowLayout; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import java.io.BufferedReader; 
import java.io.BufferedWriter; 
import java.io.IOException; 
import java.io.InputStreamReader; 
import java.io.OutputStreamWriter; 
import java.io.PrintWriter; 
import java.net.InetAddress; 
import java.net.Socket; 
import java.net.UnknownHostException; 

import javax.swing.JButton; 
import javax.swing.JFrame; 
import javax.swing.JPanel; 

class Form extends JFrame implements ActionListener{ 

    JButton btnEnter = new JButton("Enter Garage");; 
    JButton btnLeave = new JButton("Leave Garage");; 
    Client client = new Client(); 

public void start(){ 

     FlowLayout layout = new FlowLayout(); 
     layout.setAlignment(FlowLayout.CENTER); 
     layout.setHgap(25); 
     layout.setVgap(85); 

     btnEnter.addActionListener(this); 
     btnLeave.addActionListener(this); 

     JPanel content = new JPanel(); 
     content.setLayout(layout); 
     content.add(btnEnter); 
     content.add(btnLeave); 

     setContentPane(content); 
     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     setTitle("Welcome to the Garage"); 
     setLocationRelativeTo(null); 

     setSize(500,250); 
     setVisible(true); 
    } 

    public void actionPerformed(ActionEvent e1) { 

     if(e1.getSource().equals(btnEnter)){ 

       client.enter(); 

     } 

     if(e1.getSource().equals(btnLeave)){ 

       client.leave(); 

     } 

    } 
} 

public class Client{ 

    Socket socket; 
    PrintWriter out; 
    BufferedReader in; 
    String name = "Client"; 

    Client() { 


    } 


    public void connect() throws IOException { 
     String server = null; 
     try { 
      InetAddress addr = InetAddress.getByName(server); 
      socket = new Socket(addr, 8080); 
      in = new BufferedReader(new InputStreamReader(
        socket.getInputStream())); 
      out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(
        socket.getOutputStream())), true); 

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

    public void enter(){ 
     String stat = ""; 

     try{ 
      connect(); 
     } catch(IOException e){ 
      e.printStackTrace(); 
     } 

     send("Client"); 
     send("init_car"); 

     //Taking Garage Stage 
     send("garage1"); 
     try{ 
      while(!stat.equals("garage_taken")){ 
       System.out.println("taking??"); 
       send("chk_stat"); 
       stat = receive(); 
       System.out.println(stat); 
       Thread.sleep(500); 
      } 
     } catch(IOException e){ 
      e.printStackTrace(); 
     } catch(InterruptedException e){ 
      e.printStackTrace(); 
     } 

    } 

    public void leave(){ 

     String stat = ""; 

     send("garage2"); 
     try{ 
      while(!stat.equals("garage_released")){ 
       send("check_status"); 
       stat = receive(); 
       Thread.sleep(500); 
      } 
     } catch(IOException e){ 
      e.printStackTrace(); 
     } catch(InterruptedException e){ 
      e.printStackTrace(); 
     } 


     send("/quit"); 

    } 

    public void send(String s) { 
     if (s.equals("/quit")) { 
      //g.serv.append("Closing connection with server...\n"); 
      out.print("/quit"); 
      try { 
       socket.close(); 
      } catch (IOException e) { 
       e.printStackTrace(); 
      } 
      //g.serv.append("Connection closed. You can close the window now.\n"); 
      System.exit(0); 

     } else 
      out.println(s); 
    } 

    public String receive() throws IOException { 
     String s = ""; 
     try { 
      s = in.readLine(); 
     } catch (IOException e) { 
      socket.close(); 
     } 
     return s; 
    } 

    public static void main(String args[]) { 

     new Form().start(); 
/*  
     try { 
      client.start(); 
     }catch (InterruptedException e){ 
      e.printStackTrace(); 
     }*/ 
    } 

} 

請幫我這個。我花了很多時間試圖瞭解什麼是錯的，但因爲我不與Java經歷我沒有找到一個解決辦法:(

---

我會在這裏發佈我的代碼的其餘部分。可能是這將有助於：

import java.io.BufferedReader; 
import java.io.BufferedWriter; 
import java.io.IOException; 
import java.io.InputStreamReader; 
import java.io.OutputStreamWriter; 
import java.io.PrintWriter; 
import java.net.ServerSocket; 
import java.net.Socket; 
import java.util.Timer; 
import java.util.TimerTask; 

class OneClient extends Thread { 
    private Socket clSocket; 
    private BufferedReader in; 
    private PrintWriter out; 
    private String name=""; 
    private String carStatus = ""; 
    private Garage garage; 

    OneClient(Socket s, Garage gr) throws IOException{ 
     clSocket = s; 
     garage = gr; 
     in = new BufferedReader(new InputStreamReader(clSocket.getInputStream())); 
     out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(clSocket.getOutputStream())),true); 
     start(); 
    } 

    public void run(){ 

     try{ 
      while(true){ 
       String str = in.readLine(); 
       if(null==str || str.equals("/quit")) { 
        break; 
       } 

       if(name.equals("")) { 
        name=str; 
        System.out.println("\nNew name for a client: " + name); 
        Thread.currentThread().setName(name); 
       } else { 

        if(str.equals("init_car")){ 
         System.out.println(name + " is comming to the garage."); 
         carStatus = str; 

        } else if(str.equals("garage1")){ 
         carStatus = str; 
         System.out.println(name + " try to enter the garage..."); 
         str = garage.takeGarage(name); 
         carStatus = str; 


        } else if(str.equals("garage2")){ 
         carStatus = str; 
         str = garage.releaseGarage(); 
         carStatus = str; 


        } else if(str.equals("check_status")){ 
         out.println(carStatus); 

        } 

       } 
      } 
     } catch(IOException e){ 
     } finally { 
      try{ 
       clSocket.close(); 
      } catch(IOException e){ 
       e.printStackTrace(); 
      } 
     } 
    } 

} 

public class Server { 
    static final int PORT = 8080; 
    static ServerSocket servSocket; 
    static Garage garage; 

    public static void main(String args[]) throws IOException{ 
     servSocket = new ServerSocket(PORT); 
     Timer timer = new Timer(); 
     garage = new Garage(); 

     //TIMER TASK FOR BOTS 
     timer.schedule(new TimerTask(){ 
        public void run(){ 
         new BotClient().runBots(); 
        } 
       }, 1000, 2000); 


     System.out.println("Server is started!\n"); 
     try{ 
      while(true){ 
       Socket s = servSocket.accept(); 
       try{ 
        new OneClient(s, garage); 
       } catch(IOException e){ 
        e.printStackTrace(); 
        s.close(); 
       } 
      } 

     } finally { 
      servSocket.close(); 
     } 
    } 
} 







public class Garage { 

    static boolean isGarageFree; 
    static int counter=0; 
    static int limit=30; 

    Garage(){ 

     isGarageFree = true; 

    } 

    public String takeGarage(String name){ 

     Thread.currentThread().setName(name); 
     counter++; 

     if(counter>limit) isGarageFree = false; 
     else isGarageFree = true; 

     while(!isGarageFree){ 
      try{ 
       Thread.sleep(500); 
      } catch(InterruptedException e){ 
       e.printStackTrace(); 
      } 
     } 

     try{ 
      Thread.sleep((int) (Math.random()*500 + 1500)); 
     } catch(InterruptedException e){ 
      e.printStackTrace(); 
     } 

     System.out.println("Garage is taken by " + name + "."); 
     System.out.println("\nThere are " + counter + " cars in the garage.\n"); 


     return "garage_taken"; 

    } 

    public String releaseGarage(){ 

     try{ 
      Thread.sleep((int) (Math.random()*5000 + 2000)); 
      System.out.println("\n" + Thread.currentThread().getName() + " is releasing the garage..."); 
     } catch(InterruptedException e){ 
      e.printStackTrace(); 
     } 


     System.out.println("Garage is Released by " + Thread.currentThread().getName() + "!\n"); 
     counter--; 
     System.out.println("\nThere are " + counter + " cars in the garage.\n"); 

     return "garage_released"; 
    } 

} 




import java.io.BufferedReader; 
import java.io.BufferedWriter; 
import java.io.IOException; 
import java.io.InputStreamReader; 
import java.io.OutputStreamWriter; 
import java.io.PrintWriter; 
import java.net.InetAddress; 
import java.net.Socket; 

public class BotClient extends Thread{ 

    static int count = 0; 

    BufferedReader in; 
    PrintWriter out; 
    InetAddress addr; 
    Socket socket; 
    String name = ""; 


    BotClient(){ 

    } 

    void send(String s){ 
     if(s.length()==0){ 
      out.println("END"); 
      System.out.println("Closing..."); 
      try{ 
       socket.close(); 
      } 
      catch (Exception expt){ 
       System.out.println(expt); 
      } 
      System.exit(0); 
     } 
     else out.println(s); 

    } 

    String receive() throws IOException{ 
     return in.readLine();   
    } 

    public void init() throws IOException{ 
     count++; 
     name = "Car " + count; 
     this.setName(name); 

     try{ 
      String server = null; 
      InetAddress addr = InetAddress.getByName(server); 
      socket = new Socket(addr, Server.PORT); 
      in = new BufferedReader(
        new InputStreamReader(socket.getInputStream())); 
      out = new PrintWriter(new BufferedWriter(
        new OutputStreamWriter(socket.getOutputStream())),true); 

     }catch (Exception e){ 
      System.out.println("Exception: "+e); 
      System.out.println("Closing..."); 
      socket.close(); 
     } 
    } 

    public void run(){ 
     String stat = ""; 

     try{ 
      init(); 
     } catch(IOException e){ 
      e.printStackTrace(); 
     } 

     send(name); 
     send("init_car"); 

     send("garage1"); 

     try{ 
      while(!stat.equals("garage_taken")){ 
       send("check_status"); 
       stat = receive(); 
       Thread.sleep(500); 
      } 
     } catch(IOException e){ 
      e.printStackTrace(); 
     } catch(InterruptedException e){ 
      e.printStackTrace(); 
     } 


     send("garage2"); 
     try{ 
      while(!stat.equals("garage_released")){ 
       send("check_status"); 
       stat = receive(); 
       Thread.sleep(500); 
      } 
     } catch(IOException e){ 
      e.printStackTrace(); 
     } catch(InterruptedException e){ 
      e.printStackTrace(); 
     } 


     send("/quit"); 

    } 

    public void runBots(){ 

     new BotClient().start(); 

     try{ 
      Thread.sleep(2000); 
     }catch(InterruptedException e){ 
      e.printStackTrace(); 
     } 

    } 
} 

我敢肯定問題是某處Frame類，因爲如果我不使用的JFrame運行客戶端類，它正在

Answer 1

桂凍結，因爲你是在leave功能循環。如果你想讓你的GUI保持快速響應，你就可以應該考慮使用SwingWorker線程。但是，如果你的服務器沒有發送正確的響應，這將無濟於事，但至少GUI會保持更新和響應。

嘗試是這樣的：

public void leave() 
{ 
    SwingWorker<Void, Void> w = new SwingWorker<Void, Void>() 
    { 
     @Override 
     protected Void doInBackground() throws Exception 
     { 
      String stat = ""; 

      send("garage2"); 
      try{ 
       while(!stat.equals("garage_released")){ 
        send("check_status"); 
        stat = receive(); 
        Thread.sleep(500); 
       } 
      } catch(IOException e){ 
       e.printStackTrace(); 
      } catch(InterruptedException e){ 
       e.printStackTrace(); 
      } 


      send("/quit"); 
      return null; 
     } 
    }; 
    w.execute(); 
     // here you can block to wait for the server to be done or show some info dialog, which in turn can be closed from the thread when done 
}