JTextArea不显示文本

Question

在我在textarea中显示文本的功能中,我编写了以下代码行,但它没有显示任何文本

        jTextArea1.setText( Packet +"\n" +jTextArea1.getText());

我正在使用swingworker执行后台任务,这是我的代码

public class SaveTraffic extends SwingWorker<Void, Void> {


public GUI f = new GUI();

@Override
public Void doInBackground() throws IOException {
              //some code
              sendPacket(captor.getPacket().toString()); 
              return null;
             }//end main function

@Override
public void done() {
    System.out.println("I am DONE");

}


public void sendPacket(String Packet) {

 f.showPackets(Packet);
}

}

以及我用GUI表单编写的以下代码行

 public  void showPackets(String Packet) {

 jTextArea1.append( Packet);

}

解决方案:公共类SaveTraffic扩展SwingWorker {

     public GUI f = new GUI();

     @Override
    public Void doInBackground() throws IOException {
    f.add(jTextPane1);
   // some code

   publish(captor.getPacket().toString());

   // the method below is calling sendPacket on the background thread
   // which then calls showPackets on the background thread
   // which then appends text into the JTextArea on the background thread
  //sendPacket(captor.getPacket().toString());

    return null;
   }

  @Override
   protected void process(List<String> chunks) {
   for (String text : chunks) {
     jTextPane1.setText(text);
     f.showPackets(text);
   }
  }

  @Override
  public void done() {
   System.out.println("I am DONE");

   }

}

Answer 1

而不是使用setText()使用append()

Answer 2

你的问题是一个非常不完整的问题,一个没有足够信息来提供答案的问题,以及一个迫使我们猜测的问题,但是基于原始帖子中的这一行:

该功能被连续调用......

我猜,我会打赌,你有一个Swing线程问题.您可能希望阅读并使用SwingWorker.

从这里开始了解EDT和SwingWorkers:Swing中的并发性.

是的,你的是由后台线程中的Swing调用引起的Swing并发问题.为避免这样做,您需要从doInBackground导出数据并在Swing事件线程上调用它.一种方法是通过发布/处理方法对:

public class SaveTraffic extends SwingWorker<Void, String> {

  public GUI f = new GUI();

  @Override
  public Void doInBackground() throws IOException {

     // some code

     publish(captor.getPacket().toString());

     // the method below is calling sendPacket on the background thread
     // which then calls showPackets on the background thread
     // which then appends text into the JTextArea on the background thread
     //sendPacket(captor.getPacket().toString());

     return null;
  }

  @Override
  protected void process(List<String> packetTextList) {
     for (String packetText : packetTextList) {
        sendPacket(packetText); //edit, changed to match your code
     }
  }

  @Override
  public void done() {
     System.out.println("I am DONE");

  }

  public void sendPacket(String Packet) {

     f.showPackets(Packet);
  }
}

查看我上面链接的教程和SwingWorker API以获取更多详细信息.