get Image Bytes - Java 2D Graphics

Java examples for 2D Graphics:Image Load

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Description

get Image Bytes

Demo Code

/*//  w  w  w. j av  a 2 s.c  o m
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 * and Distribution License("CDDL") (collectively, the "License").  You
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 * obtain a copy of the License at
 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
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//package com.java2s;
import java.awt.*;
import java.util.*;
import java.io.*;
import java.awt.image.*;

import javax.imageio.ImageWriter;
import javax.imageio.ImageIO;
import javax.imageio.stream.ImageOutputStream;

public class Main {

    static public byte[] getImageBytes(String filePath, String type)
            throws IOException {
        return getImageBytes(readImage(filePath), type);
    }

    public static byte[] getImageBytes(Image image, String type)
            throws IOException {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();

        BufferedImage bufImage = convertToBufferedImage(image);
        ImageWriter writer = null;
        Iterator i = ImageIO.getImageWritersByMIMEType(type);
        if (i.hasNext()) {
            writer = (ImageWriter) i.next();
        }
        if (writer != null) {
            ImageOutputStream stream = null;
            stream = ImageIO.createImageOutputStream(baos);
            writer.setOutput(stream);
            writer.write(bufImage);
            stream.close();
            return baos.toByteArray();
        }
        return null;
    }

    static public Image readImage(String filePath) throws IOException {
        return javax.imageio.ImageIO.read(new File(filePath));
    }

    private static BufferedImage convertToBufferedImage(Image image)
            throws IOException {
        if (image instanceof BufferedImage) {
            return (BufferedImage) image;

        } else {
            MediaTracker tracker = new MediaTracker(null/*not sure how this is used*/);
            tracker.addImage(image, 0);
            try {
                tracker.waitForAll();
            } catch (InterruptedException e) {
                throw new IOException(e.getMessage());
            }
            BufferedImage bufImage = new BufferedImage(
                    image.getWidth(null), image.getHeight(null),
                    BufferedImage.TYPE_INT_RGB);

            Graphics g = bufImage.createGraphics();
            g.drawImage(image, 0, 0, null);
            return bufImage;
        }
    }
}

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