mychangeip.java

一个很详细的航空售票系统开发的例子

package com.tarena.abs.client;

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;

public class MyChangeIP extends JDialog implements ActionListener{
	private static final long serialVersionUID = 8091191162480316197L;
	private JLabel label1,label2;
	private JButton ok,cancel;
	private JTextField t1,t2;
	public MyChangeIP(JFrame frame){
		super(frame,"更改IP地址");
		label1=new JLabel("IP地址：");
		label2=new JLabel("端口号：");	
		t1=new JTextField(15);
		t2=new JTextField(15);		
		ok=new JButton("修改");ok.addActionListener(this);
		cancel=new JButton("取消");cancel.addActionListener(this);
		init();
		showMe();
	}
	public void init(){
		JPanel p=new JPanel();
		JPanel p1=new JPanel();
		JPanel p2=new JPanel();
		JPanel p3=new JPanel();

		p1.setLayout(new FlowLayout(FlowLayout.LEFT));
		p2.setLayout(new FlowLayout(FlowLayout.LEFT));
		p1.add(label1);p1.add(t1);
		p2.add(label2);p2.add(t2);
		
		p3.setLayout(new FlowLayout(FlowLayout.LEFT));
		p3.add(ok);p3.add(cancel);
		
		p.setLayout(new GridLayout(2,1));
		p.add(p1);
		p.add(p2);
	
		this.add(p,BorderLayout.CENTER);
		this.add(p3,BorderLayout.SOUTH);
		
	}	
	
	private void showMe(){
		this.setSize(300,200);
		this.setVisible(true);
		this.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);//?
	}
	@SuppressWarnings({ "unchecked", "unchecked" })
	public void actionPerformed(ActionEvent e){
		if(e.getActionCommand().equals("修改")){
//			判断文本框中的内容是否为空
			if(t1.getText().equals("") || t2.getText().equals("")){
				JOptionPane.showMessageDialog(this,"IP和端口号不能为空！");
				t1.setText("");
				t2.setText("");
			}
			try {
				PrintWriter pw = new PrintWriter(new FileOutputStream("./client_config.txt"));
				pw.println("ServerIP="+t1.getText());
				pw.flush();
				pw.println("ServerPort="+t2.getText());
				pw.flush();
				pw.close();
				JOptionPane.showMessageDialog(this,"修改成功！");
				this.dispose();
			} catch (FileNotFoundException e1) {
				e1.printStackTrace();
			}
			
		}
		if(e.getActionCommand().equals("取消")){
			this.dispose();
		}
	}
	
}