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如何将一个图片显示成为一个JFrame的背景

摘要: 如何将一个图片显示成为一个JFrame的背景

内容: 个人的一点技巧总结,希望对大家能有所帮助.

这段程序演示了如何载入图片的几种常用方法,
并同时演示了如何让其作为JPanel的背景.



1:

package test.International.chinajavaworld;

import javax.swing.JFrame;
import java.net.URL;
import javax.swing.ImageIcon;
import java.awt.MediaTracker;
import java.awt.Image;
import java.net.MalformedURLException;
import java.awt.GridLayout;
import javax.swing.JDialog;
import java.io.File;

public class TestPaintPanel {
 public static void main(String[] args) {
 JFrame fr = new JFrame();
 fr.setTitle("GIFT-PaintPanel-演示载入图片的方法");
 String urlstr = "http://photo.sohu.com/20040823/Img221677764.jpg";
 String filestr="D://a.jpg";
//如果是自己的机器上...un comment following......
// String urlstr="file:///D://a.jpg";
 URL url = null;
 try {
  url = new URL(urlstr);
 }
 catch (MalformedURLException ex) {
 }

 ImageIcon icon = new ImageIcon(url);

 //////////////////loadimage//////////////////////
 Image image = fr.getToolkit().getImage(url);
 MediaTracker tracker = new MediaTracker(fr);
 tracker.addImage(image, 0);
 try {
  tracker.waitForID(0);
 }
 catch (InterruptedException ie) {}
 ////////////////////////////////////////////////
 fr.getContentPane().setLayout(new GridLayout(2, 2));
 fr.setSize(500, 600);

 fr.getContentPane().add(new PaintPanel(image));
 fr.getContentPane().add(new PaintPanel(urlstr));
 fr.getContentPane().add(new PaintPanel(icon));
 fr.getContentPane().add(new PaintPanel(url));
 //this is a litter different...
 JDialog dialog = new JDialog(fr, "GIFT-演示让图片成为背景", true);
 //本机上的文件...
 dialog.getContentPane().add(new PaintPanel(new File(filestr)));
 dialog.setSize(200, 200);

 fr.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
 fr.setVisible(true);
 dialog.setVisible(true);
 fr.validate();
 }

}

2:

package test.International.chinajavaworld;
/**
 * 
Title: PaintPanel

 * 
Description:此程序演示如何载入图片,并让其作为panel的背景

 * 
Copyright: Copyright (c) 2005

 * 
Company: gift2u

 * @author liwu chinajavaworld
 * @version 1.0
 */
import javax.swing.*;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.net.URL;
import java.net.*;

import java.awt.MediaTracker;
import java.io.File;
import javax.imageio.ImageIO;
import java.io.*;
import java.awt.Toolkit;

public class PaintPanel
 extends JPanel {
 Image image = null;

 /**
 * PaintPanel
 * 外部给图片，直接载入
 * @param image Image
 */
 public PaintPanel(Image image) {
 this.image = image;
 }
 /**
 * PaintPanel
 * 外部给出file引用,通过ImageIO载入
 * @param file File
 */
 public PaintPanel(File file) {
 try {
  Image readImage = ImageIO.read(file);
  this.image = readImage;
 }
 catch (IOException ex) {
 }
 }

 /**
 * PaintPanel
 *外部给出string路径，通过Toolkit载入
 * @param string String
 */
 public PaintPanel(String string) {
 URL url = null;
 try {
  url = new URL(string);
 }
 catch (MalformedURLException ex) {
 }
 image = Toolkit.getDefaultToolkit().getImage(url);

 MediaTracker tracker = new MediaTracker(this);
 tracker.addImage(image, 0);
 try {
  tracker.waitForID(0);
 }
 catch (InterruptedException ie) {
 }

 }

 /**
 * PaintPanel
 *外部给出ImageIcon，利用ImageIcon载入
 * @param icon ImageIcon
 */
 public PaintPanel(ImageIcon icon) {
 this.image = icon.getImage();
 }

 /**
 * PaintPanel
 * 外部给出URL，利用ImageIcon载入
 * @param icon url
 */
 public PaintPanel(URL url) {
 ImageIcon icon = new ImageIcon(url);
 this.image = icon.getImage();
 }

 public void paintComponent(Graphics g) {
 super.paintComponent(g);
 Graphics2D g2d = (Graphics2D) g;
 if (image != null) {
  g2d.drawImage(image, 0, 0, this);
 }
 }
}

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