java编程图片(java画图图片大全)

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;

public static BufferedImage scale(BufferedImage imageToScale, int dWidth, int dHeight) {
	
    BufferedImage scaledImage = null;
    if (imageToScale != null) {
        scaledImage = new BufferedImage(dWidth, dHeight, imageToScale.getType());
        Graphics2D graphics2D = scaledImage.createGraphics();
        graphics2D.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
        graphics2D.drawImage(imageToScale, 0, 0, dWidth, dHeight, null);
        graphics2D.dispose();
    }
    return scaledImage;
}

public static BufferedImage byteToBufferedImage(byte[] b) {
    
    try {
        ByteArrayInputStream in = new ByteArrayInputStream(b);
        return ImageIO.read(in);
    } catch (IOException e) {
        e.printStackTrace();
    }
    return null;
}

public static byte[] bufferedImageToByte(BufferedImage image) {
    
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    try {
        ImageIO.write(image, "jpg", out);
    } catch (IOException e) {
        e.printStackTrace();
    }
    return out.toByteArray();
}

public static void saveByteToImage(byte[] b, String filepath) {
    
    try {
        FileOutputStream fileOutputStream = new FileOutputStream(filepath);
        fileOutputStream.write(b);
        fileOutputStream.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

public static InputStream bufferedImageToInputStream(BufferedImage image) {
    
    try {
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        ImageIO.write(image, "jpg", os);
        return new ByteArrayInputStream(os.toByteArray());
    } catch (IOException e) {
        e.printStackTrace();
    }
    return null;
}

public static void saveBufferedImage(BufferedImage image, String filepath) {
    
    try {
        File file = new File(filepath);
        ImageIO.write(image, "jpg", file);
    } catch (IOException e) {
        e.printStackTrace();
    }
}

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