java 图片质量压缩

 /**
      * 图片质量压缩
      * @param file 要压缩的图片文件
      * @param input 文件输入流
      * @param quality 压缩质量（0-1）
      * @author ouyangyaxiong
      * 2016年2月23日 上午9:10:54
      * @throws IOException
      *
      */
     public static void imgCompress(File file, InputStream input, float quality ) throws IOException{
         Iterator<ImageWriter> imgWriters = ImageIO.getImageWritersByFormatName("jpg");
         ImageWriter imgWriter = imgWriters.next();
         ImageWriteParam param = imgWriter.getDefaultWriteParam();
         param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
         param.setCompressionQuality(quality);
         OutputStream output = new FileOutputStream(file);//创建输出流
         ImageOutputStream imgOutput = ImageIO.createImageOutputStream(output);
         imgWriter.setOutput(imgOutput);
         BufferedImage bufferedImg = ImageIO.read(input);
         IIOImage iioimg = new IIOImage(bufferedImg, null, null);
         imgWriter.write(null, iioimg, param);
         output.close();
         imgOutput.close();
         imgWriter.dispose();

     }

注意：这里如果压缩透明背景的png图片会出现背景变黑的情况

参考：http://www.tutorialspoint.com/java_dip/image_compression_technique.htm,http://stackoverflow.com/questions/22812325/java-image-compression