将控制台输出重定向到GUI

Question

我借用了我在stackoverflow上找到的设计将控制台输出重定向到GUI。它工作正常，直到我开始阅读我的程序中的文本文件。现在，当我使用GUI运行程序时，不显示任何输出，GUI将冻结，然后最终自行关闭。这里是我的GUI代码削减版本：

public class GreenhouseControlsGUI { 
    public static class MyGui extends JFrame implements ActionListener { 

     // Start button 
     JButton Start = new JButton("Start"); 

     /..................................../ 

     /** 
     * The constructor. 
     */ 
    public MyGui(){  
     super("Greenhouse Controls"); 

      /............................../ 

     bottomPanel.setLayout(new FlowLayout()); 
     bottomPanel.add(Start); 

      /............................../ 

     getContentPane().add(holdAll, BorderLayout.CENTER); 

     Start.addActionListener(this); 

      /............................../ 

     setDefaultCloseOperation(DISPOSE_ON_CLOSE); 
    } 

    public void actionPerformed(ActionEvent e){ 

     if (e.getSource() == Start) 
      GreenhouseControls.startMeUp(); // Start program... 

      /............................../ 
     } 

    public static void main(String[] args){ 

     MyGui myApplication = new MyGui(); 

     // redirect output to GUI 
     myApplication.redirectSystemStreams(); 

     // Specify where will it appear on the screen: 
     myApplication.setLocation(10, 10); 
     myApplication.setSize(500, 300); 

     // Show it! 
     myApplication.setVisible(true); 
     } 

     private void updateTextArea(final String text) { 
      SwingUtilities.invokeLater(new Runnable() { 
       public void run() { 
       myText.append(text); 
       } 
      }); 
      } 

     private void redirectSystemStreams() { 

      OutputStream out = new OutputStream() { 

       @Override 
       public void write(int b) throws IOException { 
       updateTextArea(String.valueOf((char) b)); 
       } 

       @Override 
       public void write(byte[] b, int off, int len) throws IOException { 
       updateTextArea(new String(b, off, len)); 
       } 

       @Override 
       public void write(byte[] b) throws IOException { 
       write(b, 0, b.length); 
       } 
      }; 

      System.setOut(new PrintStream(out, true)); 
      System.setErr(new PrintStream(out, true)); 
      } 
    } 
} 

我敢肯定我的问题，从代码中的“文件名”路径读取开始后面，因为我的时候我发表意见没有这个问题'filename'变量声明出来。我认为将控制台输出重定向到我的GUI的方法只是重定向输出....为什么当我从文件中读取时会把所有东西搞砸？我是编程新手，我可能忽视了一些明显的东西，但我无法弄清楚。

这里是GUI类中调用静态startMeUp（）方法：

public static void startMeUp() { 
     try { 
      String option = "-f";     // (-f) to start program or (-d) to restore program 
      filename = "src/greenhouse/examples3.txt"; // read file from here 
      dumpFile = "dump.out";      // restore program from here 

      // if option is invalid invoke corresponding print statement 
      if (!(option.equals("-f")) && !(option.equals("-d"))) { 
       System.out.println("Invalid option"); 
       printUsage(); 
      } 

      GreenhouseControls gc = new GreenhouseControls(); // Create GreenhouseControls object 
      Restart restart = new Restart(0,filename, gc); // Create Restart object 
      Restore restore = new Restore(0,dumpFile);  // Create Restore object 

      // if the option value is -f ... 
      if (option.equals("-f")) { 
       gc.addEvent(restart);  // add new Restart object to addEvent() 
      } 
      gc.run();         

      // if the option value is -d ... 
      if (option.equals("-d")) { 
       gc.addEvent(restore);  // add new Restore object to addEvent() 
      } 
      gc.run(); 

      }catch (ArrayIndexOutOfBoundsException e) { 
      System.out.println("Invalid number of parameters"); 
      printUsage(); 
     } 
    } 

Answer 1

你需要在一个新的线程调用startMeUp，因为你的控制台程序阻止事件调度线程。就像这样：

new Thread() { 
    @Override public void run() { 
    GreenhouseControls.startMeUp(); 
    } 
}.start(); 

，而不是仅仅

GreenhouseControls.startMeUp();