Java – convert bufferedimage to byte without I / o []

Hi, I have a buffered image instance in memory and want to convert it to byte [] to encode it into Base64 string without I / O operation for performance consideration I am using the following APIs:

ByteArrayOutputStream baos = new ByteArrayOutputStream ();
ImageIO.write(image,"png",baos);
return baos.toByteArray();

However, the API still implicitly writes the image to the OS temporary directory, which will cause a failure when the underlying OS temporary directory is full and the temporary file cannot be created Stack trace:

Caused by: java.io.IOException: No space left on device
    at java.io.RandomAccessFile.write(RandomAccessFile.java:493)
    at javax.imageio.stream.FileCacheImageOutputStream.write(FileCacheImageOutputStream.java:134)
    at javax.imageio.stream.ImageOutputStreamImpl.write(ImageOutputStreamImpl.java:66)
    at com.sun.imageio.plugins.png.PNGImageWriter.write_magic(PNGImageWriter.java:376)
    at com.sun.imageio.plugins.png.PNGImageWriter.write(PNGImageWriter.java:1115)
    at javax.imageio.ImageWriter.write(ImageWriter.java:628)
    at javax.imageio.ImageIO.write(ImageIO.java:1480)
    at javax.imageio.ImageIO.write(ImageIO.java:1554)

Is there an efficient (such as in memory conversion or efficient I / O) way to convert without I / O? Please give me some advice

Solution

Via imageio The setusecache() method disables the imageio cache:

ImageIO.setUseCache(false);

By default, it is based on Javadoc: