原因…
问题的根本原因是您阻止了事件调度线程，这将阻止在执行命令后更新UI。
Swing是一个单线程框架，这意味着您不应在EDT上下文中执行阻塞或长时间运行的代码。Swing也不是线程安全的，这意味着永远不要在EDT上下文之外修改UI的状态。
有关更多详细信息，请参见Swing中的并发。
解…
为了解决这个问题，您有两个基本选择。您可以使用
Thread，但随后要负责确保UI的所有更新都同步到EDT的上下文，或者可以使用
SwingWorker，例如。
import java.awt.BorderLayout;import java.awt.EventQueue;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.beans.PropertyChangeEvent;import java.beans.PropertyChangeListener;import java.io.BufferedReader;import java.io.InputStreamReader;import java.util.ArrayList;import java.util.Arrays;import java.util.List;import java.util.concurrent.ExecutionException;import javax.swing.JButton;import javax.swing.Jframe;import javax.swing.JOptionPane;import javax.swing.JPanel;import javax.swing.JScrollPane;import javax.swing.Jtextarea;import javax.swing.SwingWorker;import javax.swing.UIManager;import javax.swing.UnsupportedLookAndFeelException;public class Runner { public static void main(String[] args) { new Runner(); } public Runner() { EventQueue.invokeLater(new Runnable() { @Override public void run() { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) { ex.printStackTrace(); } Jframe frame = new Jframe("Testing"); frame.setDefaultCloseOperation(Jframe.EXIT_ON_CLOSE); frame.add(new TestPane()); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } }); } public class TestPane extends JPanel { private Jtextarea ta; public TestPane() { setLayout(new BorderLayout()); ta = new Jtextarea(25, 80); add(new JScrollPane(ta)); JButton execute = new JButton("Make it so"); execute.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { execute.setEnabled(false); CommandWorker worker = new CommandWorker(ta, "cmd.exe", "/c", "cd "C:\usmt" && loadstate.bat"); worker.addPropertyChangeListener(new PropertyChangeListener() { @Override public void propertyChange(PropertyChangeEvent evt) { switch (evt.getPropertyName()) { case "state": SwingWorker work = (SwingWorker) evt.getSource(); switch (worker.getState()) { case DONE: {try { worker.get();} catch (InterruptedException | ExecutionException ex) { ex.printStackTrace();; JOptionPane.showMessageDialog(TestPane.this, "Execution of command failed: " + ex.getMessage());} finally { execute.setEnabled(true);} } break; } break; } } }); worker.execute(); } }); add(execute, BorderLayout.SOUTH); } } public static class CommandWorker extends SwingWorker<List<String>, String> { private Jtextarea ta; private List<String> commands; public CommandWorker(Jtextarea ta, List<String> commands) { this.ta = ta; this.commands = commands; } public CommandWorker(Jtextarea ta, String... commands) { this(ta, Arrays.asList(commands)); } @Override protected List<String> doInBackground() throws Exception { List<String> output = new ArrayList<>(25); ProcessBuilder builder = new ProcessBuilder(commands); builder.redirectErrorStream(true); Process p = builder.start(); try (BufferedReader r = new BufferedReader(new InputStreamReader(p.getInputStream()))) { String line = null; while ((line = r.readLine()) != null) { output.add(line); publish(line); } } return output; } @Override protected void process(List<String> chunks) { for (String text : chunks) { ta.append(text); ta.append("n"); } } }}有关更多详细信息，请参见
工作线程和SwingWorker。
