javax.imageio.IIOException: Unsupported Image Type异常，解决方法

javax.imageio.IIOException: Unsupported Image Type异常
可以采用如下方案：

public class ImagesUtils {public static byte[] compressImage(File file, int ppi) {byte[] smallImage = null;try {BufferedImage bi = ImagesUtils.readImage(file);ByteArrayOutputStream out = new ByteArrayOutputStream();Thumbnails.of(bi).size(ppi, ppi).outputFormat("png").toOutputStream(out);smallImage = out.toByteArray();} catch (IOException e) {e.printStackTrace();}return smallImage;}public static BufferedImage readImage(File file) throws IOException {return readImage(ImageIO.createImageInputStream(file));}public static BufferedImage readImage(InputStream stream) throws IOException {return readImage(ImageIO.createImageInputStream(stream));}public static BufferedImage readImage(ImageInputStream input) throws IOException {Iterator<?> readers = ImageIO.getImageReaders(input);if (readers == null || !readers.hasNext()) {return null;}ImageReader reader = (ImageReader) readers.next();reader.setInput(input);BufferedImage image;try {// 尝试读取图片 (包括颜色的转换).image = reader.read(0); // RGB} catch (IIOException e) {// 读取Raster (没有颜色的转换).Raster raster = reader.readRaster(0, null);// CMYKimage = createJPEG4(raster);}return image;}private static BufferedImage createJPEG4(Raster raster) {int w = raster.getWidth();int h = raster.getHeight();byte[] rgb = new byte[w * h * 3];// 彩色空间转换float[] Y = raster.getSamples(0, 0, w, h, 0, (float[]) null);float[] Cb = raster.getSamples(0, 0, w, h, 1, (float[]) null);float[] Cr = raster.getSamples(0, 0, w, h, 2, (float[]) null);float[] K = raster.getSamples(0, 0, w, h, 3, (float[]) null);for (int i = 0, imax = Y.length, base = 0; i < imax; i++, base += 3) {float k = 220 - K[i], y = 255 - Y[i], cb = 255 - Cb[i], cr = 255 - Cr[i];double val = y + 1.402 * (cr - 128) - k;val = (val - 128) * .65f + 128;rgb[base] = val < 0.0 ? (byte) 0 : val > 255.0 ? (byte) 0xff : (byte) (val + 0.5);val = y - 0.34414 * (cb - 128) - 0.71414 * (cr - 128) - k;val = (val - 128) * .65f + 128;rgb[base + 1] = val < 0.0 ? (byte) 0 : val > 255.0 ? (byte) 0xff : (byte) (val + 0.5);val = y + 1.772 * (cb - 128) - k;val = (val - 128) * .65f + 128;rgb[base + 2] = val < 0.0 ? (byte) 0 : val > 255.0 ? (byte) 0xff : (byte) (val + 0.5);}raster = Raster.createInterleavedRaster(new DataBufferByte(rgb, rgb.length), w, h, w * 3, 3,new int[] { 0, 1, 2 }, null);ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_sRGB);ColorModel cm = new ComponentColorModel(cs, false, true, Transparency.OPAQUE, DataBuffer.TYPE_BYTE);return new BufferedImage(cm, (WritableRaster) raster, true, null);}
}

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javax.imageio.IIOException: Unsupported Image Type异常，解决方法

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