java实现截图

package com.heming.test;


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
* 
******************************************************************************/

public 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 = "jpg";

     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!\n");
         } catch (Exception ex) {
             System.out.println(ex);
         }
     }

     public static void main(String[] args) {
         GuiCamera cam = new GuiCamera("d:\\qq", "bmp");//
         cam.snapShot();
     }
}