loadimageapplet.java

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// Fig. 2.11_01: LoadImageApplet.java
// 加载并显示图像文件

import java.awt.*; // 引入java.awt包中所有的类
import javax.swing.*; // 引入javax.swing包中所有的类
import java.net.*; // 引入java.net包中的类，支持网络功能
import javax.imageio.*; // 引入java的高级图形处理包

public class LoadImageApplet extends JApplet
{
    private Image logoJPG, logoBMP, logoPNG;
    private ImageIcon logoGIF;

    // 初始化
    public void init()
    {
        // 处理JPG格式图像
		logoJPG = getImage(getDocumentBase(), "logo.jpg");
        
		// 处理PNG格式图像
		logoPNG = getImage(getDocumentBase(), "logo.png");

		try
        {
			// 处理GIF格式文件
			logoGIF = new ImageIcon(new URL(getCodeBase(), "logo.gif"));

			// 处理BMP格式图像
            logoBMP = ImageIO.read(new URL(getCodeBase(), "logo.bmp"));				
        }
        catch (Exception e)
        {
            System.out.print("打开图形文件出错！\n" + e);
            return ;
        }
    }

    // 加载并显示图像文件
    public void paint(Graphics g)
    {
        // 调用父类的 paint 方法
        super.paint(g);

        g.setColor(Color.ORANGE);

        // 设置字体
        g.setFont(new Font("汉真广标", Font.PLAIN, 30));
        g.drawString("加载并显示图像文件", 10, 35);

        // 显示图像文件
		g.drawImage(logoJPG, 5, 50, this);
        g.drawImage(logoPNG, 160, 50, this);

        g.drawImage(logoBMP, 5, 160, this);
        logoGIF.paintIcon(this, g, 160, 160);


    } // paint 方法结束

} //  LoadImageApplet 类结束

/**************************************************************************
 * (C) Copyright 2004-2005 by Jingkui Zhong(钟京馗) and Huan Tang(唐桓).  *
 * All Rights Reserved.                                                   *
 *                                                                        *
 * DISCLAIMER: The authors of this code have used their                   *
 * best efforts in preparing the code. These efforts include the          *
 * development, research, and testing of the theories and programs        *
 * to determine their effectiveness. The authors and publisher make       *
 * no warranty of any kind, expressed or implied, with regard to these    *
 * programs or to the documentation contained in these codes. The authors *
 * shall not be liable in any event for incidental or consequential       *
 * damages in connection with, or arising out of, the furnishing,         *
 * performance, or use of these programs.                                 *
 **************************************************************************/