Java 如何将字节数组作为图像文件存储在磁盘上？
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How to store a byte array as an image file on disk?
提问by Yatendra Goel
I have a byte array representation of a Image. How to save it on disk as an image file.
我有一个图像的字节数组表示。如何将其作为图像文件保存在磁盘上。
I have already done this
我已经这样做了
OutputStream out = new FileOutputStream("a.jpg");
out.write(byteArray);
out.flush();
out.close();
But when I open the image by double-clicking it, it doesn't show any image.
但是当我通过双击打开图像时，它不显示任何图像。
采纳答案by Jon Skeet
Other than failing to use a try/finally block (at least in the code you've shown) that should be fine. (You don't need to flush an output stream if you're closing it, by the way.)
除了未能使用 try/finally 块（至少在您显示的代码中）之外，应该没问题。（顺便说一下，如果您要关闭输出流，则不需要刷新它。）
As it's not working, that suggests byteArraydoesn't actuallycontain a JPEG-encoded image. How have you created byteArrayto start with? If it's a "raw" representation, you'll probably want to encode it, e.g. using the javax.imageiopackage.
由于它不工作，这表明byteArray不实际包含JPEG编码的图像。你是byteArray如何开始创作的？如果它是“原始”表示，您可能需要对其进行编码，例如使用javax.imageio包。
回答by Darin Dimitrov
You could use the FileOutputStreamclass:
您可以使用FileOutputStream类：
FileOutputStream fos = new FileOutputStream("image.jpg");
try {
fos.write(someByteArray);
}
finally {
fos.close();
}
回答by Joonas Pulakka
You can use ImageIO API.
您可以使用ImageIO API。
The details can be a bit hairy, but first you'll probably want to create a BufferedImage using TYPE_BYTE_INDEXED type and some suitable IndexColorModel instance. Then put your byte array there. Hint: you can get the internal representation of BufferedImage with:
细节可能有点麻烦，但首先您可能想要使用 TYPE_BYTE_INDEXED 类型和一些合适的 IndexColorModel 实例创建一个 BufferedImage。然后把你的字节数组放在那里。提示：您可以通过以下方式获得 BufferedImage 的内部表示：
myDataBuffer = myBufferedImage.getRaster().getDataBuffer();
Which will likely return a data buffer of type DataBufferByte (check!), from which you get a byte array with
这可能会返回一个 DataBufferByte 类型的数据缓冲区（检查！），从中你可以得到一个字节数组
myByteArray = ((DataBufferByte) myDataBuffer).getData();
Then you can use System.arraycopy to copy your byte array onto that.
然后你可以使用 System.arraycopy 将你的字节数组复制到它上面。
