java实现缩略图和抓屏幕

import javaawtContainer;

import javaawtDimension;

import javaawtGraphicsD;

import javaawtImage;

import javaawtMediaTracker;

import javaawtRectangle;

import javaawtRenderingHints;

import javaawtRobot;

import javaawtToolkit;

import javaawtimageBufferedImage;

import javaioBufferedOutputStream;

import javaioFile;

import javaioFileOutputStream;

import javaximageioImageIO;

import decjpegJPEGCodec;

import decjpegJPEGEncodeParam;

import decjpegJPEGImageEncoder;

/**

*

* 纯java API实现图片处理

* <p>Title:ImageChangeSize</p>

* <p>Description: </p>

* <p>Copyright: Copyright (c) </p>

* <p>Company: </p>

* @author

* @version

*/

public class ImageChangeSize

{

public static void main ( String [] args )

throws InterruptedException

{

//测试生成缩略图

createThumbnail(c:\\gif c:\\uuuujpg);

//测试捕捉屏幕每隔一秒捕获一次

String path = c:\\screen\\;

int i = ;

for ( ;; )

{

i++;

String filepath = path + i + jpg;

snatchScreen(filepath);

ThreadcurrentThread()sleep();

}

}

/**

* 处理图片改变起大小可进行缩略和放大

* @param filename 源文件名称

* @param thumbWidth 处理后宽度

* @param thumbHeight 处理后高度

* @param quality 品质 最高最小

* @param outFilename 输出文件名称

*/

public static void createThumbnail ( String filename int thumbWidth int thumbHeight int quality String outFilename )

{

Image image = ToolkitgetDefaultToolkit()getImage(filename);

MediaTracker mediaTracker = new MediaTracker(new Container());

mediaTrackeraddImage(image );

try

{

mediaTrackerwaitForID();

double thumbRatio = (double) thumbWidth / (double) thumbHeight;

int imageWidth = imagegetWidth(null);

int imageHeight = imagegetHeight(null);

double imageRatio = (double) imageWidth / (double) imageHeight;

if ( thumbRatio < imageRatio )

{

thumbHeight = (int) ( thumbWidth / imageRatio );

}

else

{

thumbWidth = (int) ( thumbHeight * imageRatio );

}

BufferedImage thumbImage = new BufferedImage(thumbWidth

thumbHeight BufferedImageTYPE_INT_RGB);

GraphicsD graphicsD = thumbImagecreateGraphics();

graphicsDsetRenderingHint(RenderingHintsKEY_INTERPOLATION RenderingHintsVALUE_INTERPOLATION_BILINEAR);

graphicsDdrawImage(image thumbWidth thumbHeight null);

BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(outFilename));

JPEGImageEncoder encoder = JPEGCodeccreateJPEGEncoder(out);

JPEGEncodeParam param = encodergetDefaultJPEGEncodeParam(thumbImage);

quality = Mathmax( Mathmin(quality ));

paramsetQuality((float) quality / f false);

encodersetJPEGEncodeParam(param);

encoderencode(thumbImage);

outclose();

}

catch ( Exception e )

{

eprintStackTrace();

}

}

/**

* 抓取电脑屏幕

* @param path

*/

public static void snatchScreen ( String path )

{

Robot robot;

try

{

robot = new Robot();

Dimension d = ToolkitgetDefaultToolkit()getScreenSize();

Rectangle rect = new Rectangle( dwidth dheight);

BufferedImage image = robotcreateScreenCapture(rect);

ImageIOwrite(image jpg new File(path));

}

catch ( Exception e )

{

Systemoutprintln(Failed to snatch screen );

eprintStackTrace();

}

}

}