代碼如下:

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;

/*******************************************************************
 * 該JavaBean可以直接在其他Java應用程序中調用，實現屏幕的"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
 * @version 1.0
 *****************************************************/

public class Test
{
 private String fileName; //文件的前綴
 private String defaultName = "GuiCamera";
 static int serialNum=0;
 private String imageFormat; //圖像文件的格式
 private String defaultImageFormat="png";
 Dimension d = Toolkit.getDefaultToolkit().getScreenSize();

 /****************************************************************
 * 默認的文件前綴為GuiCamera，文件格式為PNG格式
 * The default construct will use the default
 * Image file surname "GuiCamera",
 * and default image format "png"
 ****************************************************************/
 public Test() {
 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"
 * 本構造支持JPG和PNG文件的存儲
 ****************************************************************/
 public Test(String s,String format) {

 fileName = s;
 imageFormat=format;
 }

 /****************************************************************
 * 對屏幕進行拍照
 * snapShot the Gui once
 ****************************************************************/
 public void snapShot() {

 try {
 //拷貝屏幕到一個BufferedImage對象screenshot
 BufferedImage screenshot = (new Robot()).createScreenCapture(new
 Rectangle(0, 0, (int) d.getWidth(), (int) d.getHeight()));
 serialNum++;
 //根據文件前綴變量和文件格式變量，自動生成文件名
 String name=fileName+String.valueOf(serialNum)+"."+imageFormat;
 File f = new File(name);
 System.out.print("Save File "+name);
 //將screenshot對象寫入圖像文件
 ImageIO.write(screenshot, imageFormat, f);
 System.out.print("..Finished!\n");
 }
 catch (Exception ex) {
 System.out.println(ex);
 }
 }

 public static void main(String[] args)
 {
 Test cam= new Test("d:\\Hello", "png");//

 cam.snapShot();
 }
}