java - 将ImageOutputStream转换为byte []

一直在尝试使用JAI将ImageOutputStream转换为byte []。任何输入表示赞赏。谢谢。

抱歉，这是我正在处理的代码段。我不得不早些发布它。我面临的问题是，我能够从ImageOutputStream获取ByteArrayOutputStream。但这总是给我零字节。但是，如果我使用FileOutputStream而不是ByteArrayOuputStream，则可以写入具有非零字节的文件。 :

File file = new File("C:/TIFFImages/tiff-image.tiff");
FileInputStream in = new FileInputStream(file);
long filelength = file.length();
byte[] bytes = new byte[(int)filelength];
int offset = 0;
int numRead = 0;

while (offset < bytes.length && (numRead=in.read(bytes, offset, bytes.length-offset)) >= 0) {
    offset += numRead;
}
if (offset < bytes.length) {
    throw new IOException("Could not completely read file "+file.getName());
}

ByteArrayInputStream bais = new ByteArrayInputStream(bytes);

RenderedImage src = JAI.create("stream", SeekableStream.wrapInputStream(bais, true));
RenderedOp renderedOp = MedianFilterDescriptor.create(src, MedianFilterDescriptor.MEDIAN_MASK_SQUARE , 1, null);
BufferedImage image = renderedOp.getAsBufferedImage();

ByteArrayOutputStream baos = new ByteArrayOutputStream();

ImageOutputStream  ios =  ImageIO.createImageOutputStream(baos);
//Instead of baos if I pass a FileOutputStream to the above function. It writes non zero
//bytes to the output file

TIFFImageWriterSpi tiffspi = new TIFFImageWriterSpi();
ImageWriter writer = tiffspi.createWriterInstance();
RenderedImage renderedImage = PlanarImage.wrapRenderedImage(src);
writer.setOutput(ios);
writer.write(image);
writer.write(null,new IIOImage(image, null, null), param);

System.out.println("After tiff ImageIO operations" + baos.toByteArray().length);

谢谢 ，
维奈

最佳答案

我得到了答案，这与纪尧姆的建议非常接近。除非两者之间不需要写入临时文件。以下是将ImageOutputStream转换为byte []的修改后的代码:

ByteArrayOutputStream baos = new ByteArrayOutputStream(37628);
ImageOutputStream  ios =  ImageIO.createImageOutputStream(baos);

//Instead of baos if I pass a FileOutputStream to the above function. It writes non zero
//bytes to the output file

TIFFImageWriterSpi tiffspi = new TIFFImageWriterSpi();
ImageWriter writer = tiffspi.createWriterInstance();
RenderedImage renderedImage = PlanarImage.wrapRenderedImage(src);
writer.setOutput(ios);
writer.write(image);
writer.write(null,new IIOImage(image, null, null), param);

//Create a ByteArrayInputStream to read that ByteArrayOutputStream and read it from ImageIO

ByteArrayInputStream bai = new ByteArrayInputStream(baos.toByteArray());
RenderedImage out = ImageIO.read(bai);
int size = bos.toByteArray().length;

System.out.println(""+ size);

return bos.toByteArray