java截取屏幕【转】

package com.huawei.api.site.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! ");
        } catch (Exception ex){
            System.out.println(ex);
        }
    }

    public static void main(String[] args){
        System.out.print("打开连接");
        GUICamera cam = new GUICamera("D:\\Hello", "jpg");//
        cam.snapShot();
    }
}