Convert BufferedImage to Byte Array in Java
In this example we demonstrate how to convert a BufferedImage to byte[] using standard Java. We use try-with-resources to manage the closing of OutputStream.
Convert BufferedImage to Byte Array
We create the BufferedImage by using ImageIO.read() and passing in the location of the image as an argument. Since ByteArrayOutputStream implements Closeable, we can create a ByteArrayOutputStream inside the try-catch block and the java runtime will automatically handle the closing of the stream. Next we write the BufferedImage to the ByteArrayOutputStream using ImageIO.write(). Finally, we return the byte[] using the ByteArrayOutputStream.toByteArray() method.
package com.memorynotfound.image;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.util.Arrays;
public class BufferedImageToByteArray {
public static void main(String... args){
try {
BufferedImage image = ImageIO.read(new File("/tmp/duke.png"));
byte[] byteArray = toByteArrayAutoClosable(image, "png");
System.out.println("Convert BufferedImage to byte[]: " + Arrays.toString(byteArray));
} catch (IOException e) {
e.printStackTrace();
}
}
private static byte[] toByteArrayAutoClosable(BufferedImage image, String type) throws IOException {
try (ByteArrayOutputStream out = new ByteArrayOutputStream()){
ImageIO.write(image, type, out);
return out.toByteArray();
}
}
}
