黑马程序员java教程java图片缩放

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1、用Java实现图片的缩放。1.packagecom.test;2.3.importcom.sun.image.codec.jpeg.JPEGImageEncoder;4.importcom.sun.image.codec.jpeg.JPEGCodec;5.importcom.sun.image.codec.jpeg.JPEGEncodeParam;6.importjavax.swing.*;7.importjava.io.File;8.importjava.io.FileOutputStream;9.importjava.io.IOException;10.importjava.awt.

2、*;11.importjava.awt.image.BufferedImage;12.importjava.awt.image.Kernel;13.importjava.awt.image.ConvolveOp;14.15.publicclassImageUtil{16.17.      publicstaticvoidresize(FileoriginalFile,FileresizedFile,18.                intnewWidth,floatquality)throwsIOException{19.20.          if(quality>1){21. 

3、               thrownewIllegalArgumentException(22.                          "Qualityhastobebetween0and1");23.          }24.25.          ImageIconii=newImageIcon(originalFile.getCanonicalPath());26.          Imagei=ii.getImage();27.          ImageresizedImage=null;28.29.          intiWidth=i.getW

4、idth(null);30.          intiHeight=i.getHeight(null);1.2.          if(iWidth>iHeight){3.                resizedImage=i.getScaledInstance(newWidth,(newWidth*iHeight)4.                          /iWidth,Image.SCALE_SMOOTH);5.          }else{6.                resizedImage=i.getScaledInstance((newWidt

5、h*iWidth)/iHeight,7.                          newWidth,Image.SCALE_SMOOTH);8.          }9.10.          //Thiscodeensuresthatallthepixelsintheimageareloaded.11.          Imagetemp=newImageIcon(resizedImage).getImage();12.13.          //Createthebufferedimage.14.          BufferedImagebufferedImage

6、=newBufferedImage(temp.getWidth(null),15.                      temp.getHeight(null),BufferedImage.TYPE_INT_RGB);16.17.          //Copyimagetobufferedimage.18.          Graphicsg=bufferedImage.createGraphics();19.20.          //Clearbackgroundandpainttheimage.21.          g.setColor(Color.white);2

7、2.          g.fillRect(0,0,temp.getWidth(null),temp.getHeight(null));23.          g.drawImage(temp,0,0,null);24.          g.dispose();25.26.          //Soften.27.          floatsoftenFactor=0.05f;28.          float[]so