我在文本框设置了键盘监听 当释放enter时，方法内容跟发送按钮的一样，但是会多发送一行空格。
标准的设置Enter为发送是怎么设置的，只有一个ENTER键!
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- Java code
JTextField textfield = new JTextField(20);KeyStroke enter_keystroke = KeyStroke.getKeyStroke(KeyEvent.VK_ENTER,0);Action send_message_then_clear_action = new AbstractAction(){ @Override public void actionPerformed(ActionEvent e){ JTextField tf = (JTextField)e.getSource(); sendMessage(tf.getText()); tf.setText(""); }};InputMap inputmap = textfield.getInputMap();ActionMap actionmap = textfield.getActionMap();inputmap.put(enter_keystroke,"send-message-then-clear");actionmap.put("send-message-then-clear",send_message_then_clear_action);
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- Java code
package com.gui;import java.awt.BorderLayout;import java.awt.FlowLayout;import java.awt.Font;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.KeyEvent;import java.awt.event.KeyListener;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JPanel;import javax.swing.JScrollPane;import javax.swing.JTextArea;import javax.swing.JTextField;public class ChatWin extends JFrame { private static final long serialVersionUID = -5418344602348249043L; private JPanel pup = new JPanel(); private JPanel pdown = new JPanel(); private JTextField txtCommand = new JTextField(45); private JTextArea txtContent = new JTextArea(); private JButton btnExec = new JButton("Execute"); public ChatWin() { // 指定框架的布局管理器 setLayout(new BorderLayout()); // 设置文本框,文本域字体 txtCommand.setFont(new Font("", Font.BOLD, 13)); txtContent.setFont(new Font("", Font.BOLD, 13)); // 指定面板的布局 pup.setLayout(new BorderLayout()); pdown.setLayout(new FlowLayout()); // 将文本域添加导面板中 pup.add(txtContent); // 为文本域添加滚动条 pup.add(new JScrollPane(txtContent)); // 将文本框,按钮添加到面板中 pdown.add(txtCommand); pdown.add(btnExec); // 添加面板到框架中 this.add(pup, BorderLayout.CENTER); this.add(pdown, BorderLayout.SOUTH); // 设置事件 // 添加按钮事件 btnExec.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { sendMsg(); } }); // 添加键盘Enter事件 txtCommand.addKeyListener(new KeyListener() { public void keyPressed(KeyEvent e) { // 当按下回车时 if (e.getKeyCode() == KeyEvent.VK_ENTER) { sendMsg(); } } public void keyReleased(KeyEvent e) { } public void keyTyped(KeyEvent e) { } }); } private void sendMsg() { String command = txtCommand.getText().trim(); txtContent.append("You: " + command + "\r\n"); txtCommand.setText(""); } public static void main(String[] args) { ChatWin frame = new ChatWin(); frame.setTitle("ChatWin"); frame.setSize(666, 444); frame.setVisible(true); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); }}