使用JMagick压缩图片大小尺寸

private Map processHead(MagickImage source) throws Exception {
  MagickImage regulate = null;
  MagickImage large = null;
  MagickImage small = null;

  //保存图片的临时目录
  String tempPath = "....";
  //随即生成一个文件名，真是情况生成的目录可能更复杂
  String fn = FileUtil.getInstance().getRandName();
  String largeName = SIZENAME_LARGE + "_" + fn + ".jpg";
  String smallName = SIZENAME_SMALL + "_" + fn + ".jpg";

  try {
    //改变图片大小
    regulate = ImageUtil.regulate(source);
    large = ImageUtil.resizePhoto(regulate, tempPath + largeName, 500, 750);
    small = ImageUtil.resizePhoto(large, tempPath + smallName, 90, 120);
    byte[] largeByte = large.imageToBlob(new ImageInfo());
    byte[] smallByte = small.imageToBlob(new ImageInfo());

    //保存图片的目录
    String uploadPath = "....";
    //写文件到目录
    FileUtil.getInstance().writeFile(uploadPath + largeName, largeByte);
    FileUtil.getInstance().writeFile(uploadPath + smallName, smallByte);

    //返回图片地址
    Map map = new HashMap();
    map.put(SIZENAME_LARGE, "/" + dir + largeName);
    map.put(SIZENAME_SMALL, "/" + dir + smallName);
    return map;
  } catch (Exception e) {
    throw e;
  } finally {
    if (small != null)
      small.destroyImages();
    if (large != null)
      large.destroyImages();
    if (regulate != null)
      regulate.destroyImages();
    }
  }
}

public static MagickImage regulate(MagickImage source) throws MagickException {
  int width = (int) source.getDimension().getWidth();
  int height = (int) source.getDimension().getHeight();
  if ((height + 0.0) / width > 1.5) {
    MagickImage image = null;
    MagickImage scaled = null;
    try {
      int newHeight = (int) Math.round(width * 1.5);
      Rectangle rect = new Rectangle(0, (height - newHeight) / 2, width, newHeight);
      ImageInfo info = null;
      info = new ImageInfo();

      scaled = source.cropImage(rect);
      return scaled;
    } finally {
      if (source != null) {
        source.destroyImages();
      }
    }
  } else {
    return source;
  }
}