guicamera.java

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import java.awt.image.BufferedImage;
import java.io.*;
import javax.imageio.*;
import java.awt.*;

/*******************************************************************
* 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 ([e-mail])
* @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="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!\n");
    }
    catch (Exception ex) {
      System.out.println(ex);
    }
  }
  public static void main(String[] args)
  {
      new GuiCamera("d:\\hello","png").snapShot();
      
  }
}