serpanelframe.java

Java程序设计大学教程程序源代码

/*
 * PanelFrame.java
 * 参见教程303页 示例程序10-7
 * Created on 2005年6月20日, 下午9:02
 *
 * @author Liu Yi  ( http://www.liu-yi.net )
 */

package jbookch10;

import java.awt.*;
import java.io.*;
import javax.swing.*;
import javax.imageio.*;
import java.net.*;

public class SerPanelFrame extends JFrame {
    
    /** Creates a new instance of PanelFrame */
    public SerPanelFrame(int width,int height) {
        setSize(width,height);//设置框架大小
        setTitle("Frame主窗体");//设置框架标题
        //将框架显示在屏幕正中
        Toolkit kit= Toolkit.getDefaultToolkit();
        Dimension screenSize=kit.getScreenSize();
        int x=(screenSize.width-width)/2;
        int y=(screenSize.height-height)/2;
        setLocation(x,y);//设置框架位置
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
    
    private void serializePanel(ContentPanel p,String filename){
        try {
            FileOutputStream outStream= new FileOutputStream(filename);
            ObjectOutputStream out= new ObjectOutputStream(outStream);
            out.writeObject(p);
            out.flush();
            out.close();
        } catch(Exception e) {
            System.out.println(e);
        }
        
    }
    
    public static void main(String args[]) {
        SerPanelFrame frame=new SerPanelFrame(300,200);
        ContentPanel contentPanel=new ContentPanel( );
        //把其它组件添加到面板中;
        contentPanel.add(new JButton("OK"));
        frame.setContentPane(contentPanel);
        frame.setVisible(true);
        frame.serializePanel(contentPanel,"MyPanel.ser");
    }
}


class ContentPanel extends JPanel{
    //在面板中绘制图文;
    public void paintComponent(Graphics g)  {
        super.paintComponent(g);
        g.drawOval(120, 60, 150, 70);//绘制一个椭圆
        try{
            g.drawString("这是一个面板！",160,100);//绘制一行文字
            Image image=ImageIO.read(new URL(urlname));
            g.drawImage(image,30,30,null);//绘制一幅图片
        } catch ( IOException  e ){
            g.drawString("加载图形失败！",100,100);
        }
    }
 
    String urlname="http://www.liu-yi.net/HTML/IMAGE/stamp_yi.JPG";
 
}