importjava.awt.Image;importjava.awt.image.BufferedImage;importjava.io.File;importjava.io.FileOutputStream;importjavax.imageio.ImageIO;importcom.sun.image.codec.jpeg.JPEGCodec;importcom.sun.image.codec.jpeg.JPEGImageEncoder;publicclassSnippet {/*** 创建图片缩略图(等比缩放)

*

*@paramsrc

*            源图片文件完整路径

*@paramdist

*            目标图片文件完整路径

*@paramwidth

*            缩放的宽度

*@paramheight

*            缩放的高度*/publicstaticvoidcreateThumbnail(String src, String dist,floatwidth,floatheight) {try{

File srcfile=newFile(src);if(!srcfile.exists()) {

System.out.println("文件不存在");return;

}

BufferedImage image=ImageIO.read(srcfile);//获得缩放的比例doubleratio=1.0;//判断如果高、宽都不大于设定值，则不处理if(image.getHeight()>height||image.getWidth()>width) {if(image.getHeight()>image.getWidth()) {

ratio=height/image.getHeight();

}else{

ratio=width/image.getWidth();

}

}//计算新的图面宽度和高度intnewWidth=(int) (image.getWidth()*ratio);intnewHeight=(int) (image.getHeight()*ratio);

BufferedImage bfImage=newBufferedImage(newWidth, newHeight,

BufferedImage.TYPE_INT_RGB);

bfImage.getGraphics().drawImage(

image.getScaledInstance(newWidth, newHeight,

Image.SCALE_SMOOTH),0,0,null);

FileOutputStream os=newFileOutputStream(dist);

JPEGImageEncoder encoder=JPEGCodec.createJPEGEncoder(os);

encoder.encode(bfImage);

os.close();

System.out.println("创建缩略图成功");

}catch(Exception e) {

System.out.println("创建缩略图发生异常"+e.getMessage());

}

}publicstaticvoidmain(String[] args) {

createThumbnail("E:\\test_1920x1200.jpg","D:\\a.png",100,100);

createThumbnail("E:\\test_1920x1200.jpg","D:\\b.png",2000,2000);

createThumbnail("E:\\test_1920x1200.jpg","D:\\c.jpg",800,600);

}

}