问题
Sounds simple right? Use
ImageIO.read(new ByteArrayInputStream(bytes));
Here's the wrinkle. For some reason it is detecting a jpeg as a bmp, and that is the first ImageReader returned when I call
ImageInputStream iis = ImageIO.createImageInputStream(new ByteArrayInputStream(bytes));
Iterator<ImageReader> readers=ImageIO.getImageReaders(iis);
This causes the image to come out corrupted. Is there a way to tell through java short of looking directly at the bytes for the header, and failing that does anyone know of a good reference for the byte headers for the different images?
Just letting you guys know I am still working on this. I'll let you know if/when I have an answer. I thank all of you for your responses so far.
回答1:
Haven't played with ImageIO in a awhile, and have not tested this, but I seem to recall something like this working. (since you say you know your file is a jpg and not a bitmap, I am using that information to help find the right loader).
String inFormat = "jpg";
Iterator inReaders = ImageIO.getImageReadersByFormatName(inFormat);
...
nextInReader.setInput( iis );
回答2:
For the reference you can have a look at wikipedia, you can find the header of the different formats there.
http://en.wikipedia.org/wiki/Graphics_Interchange_Format
http://en.wikipedia.org/wiki/BMP_file_format
http://en.wikipedia.org/wiki/JPEG
回答3:
Is the BMP reader the only one returned by getImageReaders()? Maybe you get more than one and can make a choice based on that.
来源：https://stackoverflow.com/questions/1212882/convert-byte-array-to-image-in-java-without-knowing-the-type