AddMenu

package logSFTP;

import java.awt.Dimension;
import java.awt.Point;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenuItem;
import javax.swing.JPasswordField;
import javax.swing.JPopupMenu;
import javax.swing.JTextField;

public class AddMenu extends JFrame implements ActionListener
{
 private JLabel label;
 private JLabel label1;
 private JLabel label2;
 private JLabel label3;
 private final JTextField text;
 private final JTextField text1;
 private final JTextField text2;
 private final JTextField text3;
 private JButton popupButton;
 private JPopupMenu menu;
 private JButton ok;
 private JButton cancel;
 public AddMenu()
 {
  super("添加页面");
  Dimension dimension = Toolkit.getDefaultToolkit().getScreenSize();
  // 下面两行是取得屏幕的高度和宽度
  double lx = dimension.getWidth();
  double ly = dimension.getHeight();
  // 设定窗口出现位置
  this.setLocation(new Point((int) (lx / 2) - 150, (int) (ly / 2) - 200));
  // 设定窗口大小
  this.setSize(360,360);
  this.setLayout(null);
  this.setDefaultCloseOperation(this.EXIT_ON_CLOSE);
  
  label = new JLabel("IP地址");
  label.setBounds(60, 25, 100, 30);
  this.add(label);
  
  label1 = new JLabel("用户名");
  label1.setBounds(60, 65, 100, 30);
  this.add(label1);
  
  label2 = new JLabel("密    码");
  label2.setBounds(60, 105, 100, 30);
  this.add(label2);
  
  label3 = new JLabel("日志文件");
  label3.setBounds(60, 145, 100, 30);
  this.add(label3);
  
  text = new JTextField();
  text.setBounds(120, 25, 120, 25);
  this.add(text);
  
  text1 = new JTextField();
  text1.setBounds(120, 65, 120, 25);
  this.add(text1);
  
  text2 = new JPasswordField();
  text2.setBounds(120, 105, 120, 25);
  this.add(text2);
  
  text3 = new JTextField();
  text3.setBounds(120, 145, 120, 25);
  text3.setEditable(false);
  this.add(text3);
  
  popupButton = new JButton("请选择");
  popupButton.setBounds(250, 145, 80, 25);
  popupButton.addActionListener(this);
  menu = new JPopupMenu();
  String[] textArr = new String[]{"interface","debug","worning"};
  for (String str : textArr)
  {
   JMenuItem item = new JMenuItem(str);
   item.addActionListener(this);
   menu.add(item);
  }
  this.add(popupButton);
  
  ok = new JButton("提交");
  ok.setBounds(90, 245, 70, 30);
  
  cancel = new JButton("重置");
  cancel.setBounds(210, 245, 70, 30);
  
  ok.addActionListener(
    new ActionListener()
    {
     @Override
     public void actionPerformed(ActionEvent e)
     {
      // TODO Auto-generated method stub
     }
     });
  
  cancel.addActionListener(
    new ActionListener() {
     
     @Override
     public void actionPerformed(ActionEvent e) {
      text.setText("");
      text1.setText("");
      text2.setText("");
      text3.setText("");
     }
    });
  
  this.add(ok);
  this.add(cancel);
  this.setVisible(true);
  }

 @Override
 public void actionPerformed(ActionEvent ae) {
  if (ae.getSource() == popupButton)
  {
   menu.show(popupButton, 0, popupButton.getHeight());
  }
  else
  {
   JMenuItem item = (JMenuItem) ae.getSource();
   text3.setText(item.getText());
  }
 }
 
 public static void main (String[] args)
 {
  new AddMenu();
 }
}