Java Swing处理状态

我正在尝试实现一个swing架。 在此，我想在执行所需任务时使用不同的线程在textPanel中显示处理状态。 我尝试了以下代码。 当然逻辑有问题。 请提供正确的方法

import java.awt.EventQueue; import javax.swing.JFrame; import javax.swing.JTextField; import javax.swing.JButton; import java.awt.event.ActionListener; import java.awt.event.ActionEvent; public class SampleSwing { private JFrame frame; public static JTextField textField; public static boolean processing=false; /** * Launch the application. */ public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { SampleSwing window = new SampleSwing(); window.frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } /** * Create the application. */ public SampleSwing() { initialize(); } /** * Initialize the contents of the frame. */ private void initialize() { frame = new JFrame(); frame.setBounds(100, 100, 450, 300); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.getContentPane().setLayout(null); textField = new JTextField(); textField.setBounds(0, 31, 434, 20); frame.getContentPane().add(textField); textField.setColumns(10); JButton btnNewButton = new JButton("New button"); btnNewButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { processing=true; Processingstatus ps=new Processingstatus(); ps.start(); /*perform the actual task*/ processing=false; } }); btnNewButton.setBounds(174, 74, 89, 23); frame.getContentPane().add(btnNewButton); } } class Processingstatus extends Thread{ public void run() { try { while(SampleSwing.processing) { SampleSwing.textField.setText("Processing"); Thread.sleep(1000); SampleSwing.textField.setText("Processing.."); Thread.sleep(1000); SampleSwing.textField.setText("Processing..."); Thread.sleep(1000); } } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } 

Answer 1

首先我想，“你应该使用SwingWorker ，因为它有处理进度和EDT更新的方法……”

但是当我仔细观察时，你实际上并不真正关心过程本身，你只是想要一些显示进程正在运行的地方……它们是两个独立的实体，只是因为一个（UI更新）只要另一个正在运行，它就会运行。

所以，相反，我使用了javax.swing.Timer 。 这允许我安排一个事件每n毫秒发生一次，并在EDT中触发，漂亮而干净……

 import java.awt.EventQueue; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.util.List; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JTextField; import javax.swing.SwingWorker; import javax.swing.Timer; public class SampleSwing { private JFrame frame; public static JTextField textField; public static boolean processing = false; public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { SampleSwing window = new SampleSwing(); window.frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } public SampleSwing() { initialize(); } private Timer processTimer; private void initialize() { frame = new JFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setLayout(new GridBagLayout()); GridBagConstraints gbc = new GridBagConstraints(); gbc.gridwidth = GridBagConstraints.REMAINDER; textField = new JTextField(25); frame.add(textField, gbc); processTimer = new Timer(500, new ActionListener() { private StringBuilder dots = new StringBuilder(3); @Override public void actionPerformed(ActionEvent e) { dots.append("."); if (dots.length() > 3) { dots.delete(0, dots.length()); } textField.setText("Processing" + dots.toString()); } }); JButton btnNewButton = new JButton("New button"); btnNewButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { if (!processing) { processing = true; processTimer.start(); } else { processTimer.stop(); processing = false; textField.setText(null); } } }); frame.add(btnNewButton, gbc); frame.pack(); frame.setLocationRelativeTo(null); } } 

ps由于原始代码不起作用的原因，请参阅上述评论部分中的评论;）