public static boolean compressPic(String srcFilePath, String descFilePath) {
    File file = null;
    BufferedImage src = null;
    FileOutputStream out = null;
    ImageWriter imgWrier;
    ImageWriteParam imgWriteParams;

    // 指定写图片的方式为 jpg
    imgWrier = ImageIO.getImageWritersByFormatName("jpg").next();
    imgWriteParams = new javax.imageio.plugins.jpeg.JPEGImageWriteParam(null);
    // 要使用压缩,必须指定压缩方式为MODE_EXPLICIT
    imgWriteParams.setCompressionMode(imgWriteParams.MODE_EXPLICIT);
    // 这里指定压缩的程度,参数qality是取值0~1范围内,
    imgWriteParams.setCompressionQuality((float) 0.1);
    imgWriteParams.setProgressiveMode(imgWriteParams.MODE_DISABLED);
    ColorModel colorModel = ColorModel.getRGBdefault();
    // 指定压缩时使用的色彩模式
    imgWriteParams.setDestinationType(
        new javax.imageio.ImageTypeSpecifier(
            colorModel, colorModel.createCompatibleSampleModel(16, 16)));

    try {
      if (StringUtils.isBlank(srcFilePath)) {
        return false;
      } else {
        file = new File(srcFilePath);
        src = ImageIO.read(file);
        out = new FileOutputStream(descFilePath);

        imgWrier.reset();
        // 必须先指定 out值,才能调用write方法, ImageOutputStream可以通过任何 OutputStream构造
        imgWrier.setOutput(ImageIO.createImageOutputStream(out));
        // 调用write方法,就可以向输入流写图片
        imgWrier.write(null, new IIOImage(src, null, null), imgWriteParams);
        out.flush();
        out.close();
      }
    } catch (Exception e) {
      e.printStackTrace();
      return false;
    }
    return true;
  }
 public void reset() {
   super.reset();
   stream = null;
 }
 public void reset() {
   super.reset();
   rasterWriter = null;
 }
예제 #4
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 public void reset() {
   super.reset();
   resetLocal();
 }