图片压缩

public void proce(String oldFile, int width, int height, float quality,
String smallIcon) {
String newImage = null;
try {
Image srcFile = ImageIO.read(new File(oldFile));
double rate1 = ((double) srcFile.getWidth(null)) / (double) width;
double rate2 = ((double) srcFile.getHeight(null)) / (double) height;
double rate = rate1 > rate2 ? rate1 : rate2;
int new_w = (int) (((double) srcFile.getWidth(null)) / rate);
int new_h = (int) (((double) srcFile.getHeight(null)) / rate);
BufferedImage tag = new BufferedImage(new_w, new_h,
BufferedImage.TYPE_INT_RGB);
tag.getGraphics().drawImage(srcFile, 0, 0, new_w, new_h, null);
String filePrex = oldFile.substring(0, oldFile.lastIndexOf('.'));
newImage = filePrex + smallIcon
+ oldFile.substring(filePrex.length());
FileOutputStream out = new FileOutputStream(newImage);
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
JPEGEncodeParam jep = JPEGCodec.getDefaultJPEGEncodeParam(tag);
jep.setQuality(quality, true);
encoder.encode(tag, jep);
out.close();
srcFile.flush();
srcFile = null;
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
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