图片缩放

package utils;

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

public class ImageUtils {
/**
* 通过BufferedImage图片流调整图片大小
*/
public static BufferedImage resizeImage(BufferedImage originalImage, int targetWidth, int targetHeight) throws IOException {
Image resultingImage = originalImage.getScaledInstance(targetWidth, targetHeight, Image.SCALE_AREA_AVERAGING);
BufferedImage outputImage = new BufferedImage(targetWidth, targetHeight, BufferedImage.TYPE_INT_RGB);
outputImage.getGraphics().drawImage(resultingImage, 0, 0, null);
return outputImage;
}


/**
* BufferedImage图片流转byte[]数组
*/
public static byte[] imageToBytes(BufferedImage bImage) {
ByteArrayOutputStream out = new ByteArrayOutputStream();
try {
ImageIO.write(bImage, "jpg", out);
} catch (IOException e) {
e.printStackTrace();
}
return out.toByteArray();
}


/**
* byte[]数组转BufferedImage图片流
*/
private static BufferedImage bytesToBufferedImage(byte[] ImageByte) {
ByteArrayInputStream in = new ByteArrayInputStream(ImageByte);
BufferedImage image = null;
try {
image = ImageIO.read(in);
} catch (IOException e) {
e.printStackTrace();
}
return image;
}
}