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      1. java實現縮略圖和抓屏幕

        時間:2024-09-09 15:42:09 JAVA認證 我要投稿
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        java實現縮略圖和抓屏幕

          在全球范圍內,SUN公司的Java技術培訓和認證不僅是Java開發技術領域最權威的認證,同時也是開發類認證中很重要的一種.以下是小編整理的關于java實現縮略圖和抓屏幕,希望大家認真閱讀!

          import java.awt.Container;

          import java.awt.Dimension;

          import java.awt.Graphics2D;

          import java.awt.Image;

          import java.awt.MediaTracker;

          import java.awt.Rectangle;

          import java.awt.RenderingHints;

          import java.awt.Robot;

          import java.awt.Toolkit;

          import java.awt.image.BufferedImage;

          import java.io.BufferedOutputStream;

          import java.io.File;

          import java.io.FileOutputStream;

          import javax.imageio.ImageIO;

          import com.sun.image.codec.jpeg.JPEGCodec;

          import com.sun.image.codec.jpeg.JPEGEncodeParam;

          import com.sun.image.codec.jpeg.JPEGImageEncoder;

          /**

          *

          * 純java API實現圖片處理

          *

          Title:ImageChangeSize

          *

          Description:

          *

          Copyright: Copyright (c) 2010

          *

          Company:

          * @author

          * @version 1.0.0

          */

          public class ImageChangeSize

          {

          public static void main ( String [] args )

          throws InterruptedException

          {

          //測試生成縮略圖

          createThumbnail("c:\555.gif", 200, 200, 100, "c:\uuuu.jpg");

          //測試捕捉屏幕,每隔一秒捕獲一次

          String path = "c:\screen\";

          int i = 0;

          for ( ;; )

          {

          i++;

          String filepath = path + i + ".jpg";

          snatchScreen(filepath);

          Thread.currentThread().sleep(2000);

          }

          }

          /**

          * 處理圖片,改變起大小,可進行縮略和放大

          * @param filename 源文件名稱

          * @param thumbWidth 處理后寬度

          * @param thumbHeight 處理后高度

          * @param quality 品質 最高100,最小0

          * @param outFilename 輸出文件名稱

          */

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

          {

          Image image = Toolkit.getDefaultToolkit().getImage(filename);

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

          mediaTracker.addImage(image, 0);

          try

          {

          mediaTracker.waitForID(0);

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

          int imageWidth = image.getWidth(null);

          int imageHeight = image.getHeight(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, BufferedImage.TYPE_INT_RGB);

          Graphics2D graphics2D = thumbImage.createGraphics();

          graphics2D.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);

          graphics2D.drawImage(image, 0, 0, thumbWidth, thumbHeight, null);

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

          JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);

          JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(thumbImage);

          quality = Math.max(0, Math.min(quality, 100));

          param.setQuality((float) quality / 100.0f, false);

          encoder.setJPEGEncodeParam(param);

          encoder.encode(thumbImage);

          out.close();

          }

          catch ( Exception e )

          {

          e.printStackTrace();

          }

          }

          /**

          * 抓取電腦屏幕

          * @param path

          */

          public static void snatchScreen ( String path )

          {

          Robot robot;

          try

          {

          robot = new Robot();

          Dimension d = Toolkit.getDefaultToolkit().getScreenSize();

          Rectangle rect = new Rectangle(0, 0, d.width, d.height);

          BufferedImage image = robot.createScreenCapture(rect);

          ImageIO.write(image, "jpg", new File(path));

          }

          catch ( Exception e )

          {

          System.out.println("Failed to snatch screen ... ");

          e.printStackTrace();

          }

          }

          }

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