guicamera.java

Good code for who should study JAVA APPLET

import java.awt.Dimension;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.io.File;

import javax.imageio.ImageIO;

/*******************************************************************************
 * 该JavaBean可以直接在其他Java应用程序中调用，实现屏幕的"拍照" This JavaBean is used to snapshot the
 * GUI in a Java application! You can embeded it in to your java application
 * source code, and us it to snapshot the right GUI of the application
 * 
 * @see javax.ImageIO
 * @author liluqun ([email][e-mail][/email])
 * @version 1.0
 * 
 ******************************************************************************/

class GuiCamera
{
    private String fileName; // 文件的前缀

    private String defaultName = "GuiCamera";

    static int serialNum = 0;

    private String imageFormat; // 图像文件的格式

    private String defaultImageFormat = "png";

    Dimension d = Toolkit.getDefaultToolkit().getScreenSize();

    /***********************************************************************
     * 默认的文件前缀为GuiCamera，文件格式为PNG格式 The default construct will use the
     * default Image file surname "GuiCamera", and default image format
     * "png"
     **********************************************************************/
    public GuiCamera()
    {
    fileName = defaultName;
    imageFormat = defaultImageFormat;
    }

    /***********************************************************************
     * @param s
     *                the surname of the snapshot file
     * @param format
     *                the format of the image file, it can be "jpg" or "png"
     *                本构造支持JPG和PNG文件的存储
     **********************************************************************/
    public GuiCamera(String s, String format)
    {
    fileName = s;
    imageFormat = format;
    }

    /***********************************************************************
     * 对屏幕进行拍照 snapShot the Gui once
     **********************************************************************/
    public void snapShot()
    {
    try
    {
        // 拷贝屏幕到一个BufferedImage对象screenshot
        BufferedImage screenshot = (new Robot())
            .createScreenCapture(new Rectangle(0, 0,
                (int) d.getWidth(), (int) d.getHeight()));
        serialNum++;
        // 根据文件前缀变量和文件格式变量，自动生成文件名
        String name = fileName + String.valueOf(serialNum) + "."
            + imageFormat;
        File f = new File(name);
        System.out.print("Save File " + name);
        // 将screenshot对象写入图像文件
        ImageIO.write(screenshot, imageFormat, f);
        System.out.print("..Finished! ");
    } catch (Exception ex)
    {
        System.out.println(ex);
    }
    }

    public static void main(String[] args)
    {
    GuiCamera cam = new GuiCamera("Test", "png");
    cam.snapShot();
    }
}