java图片压缩、解压缩

/**
 * 对图像进行压缩
 * @param image 图像
 * @return 图像数据包装类
 * @throws ImageFormatException
 * @throws IOException
 * @throws IOException
 */
public static ImageTransferObject encodeImage(BufferedImage image)
        throws ImageFormatException, IOException{
    ImageTransferObject ito = new ImageTransferObject();

    ByteArrayOutputStream out = new ByteArrayOutputStream();
    JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
    JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(image);
    param.setQuality(0.5f, false);
    encoder.setJPEGEncodeParam(param);
    encoder.encode(image);
    ito.setImgbuf(out.toByteArray());

    return ito;

}

 

/**对图像进行解压缩
 * @param ito 图像数据包装类
 * @return BufferedImage 图像
 * @throws ImageFormatException
 * @throws IOException
 * @throws IOException
 */

public static BufferedImage decodeImage(ImageTransferObject ito)
        throws ImageFormatException, IOException{
 
    byte[] buf = ito.getImgbuf();
    ByteArrayInputStream in = new ByteArrayInputStream(buf);
    JPEGImageDecoder decoder = JPEGCodec.createJPEGDecoder(in);
    BufferedImage image = decoder.decodeAsBufferedImage();
 
    return image;
}