java截图功能

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
*****************************************************/
public class Test
{  
    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 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"
     * 本构造支持JPG和PNG文件的存储
     ****************************************************************/
    public Test(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!\n");
      }
      catch (Exception ex) {
        System.out.println(ex);
      }
    }
    public static void main(String[] args)
    {
     Test cam= new Test("d:\\Hello", "png");//
        cam.snapShot();
    }
}