java图片放大或缩小

package org.jimmy.autotranslate20181022.utils;

import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.File;

import javax.imageio.ImageIO;

public class Utils {

    public static void zoomInImage(String srcPath, String newPath, int maxWidth, int maxHeight) throws Exception {
        BufferedImage bufferedImage = null;
        File file = new File(srcPath);
        bufferedImage = ImageIO.read(file);
        if(bufferedImage != null){
            bufferedImage = zoomInImage(bufferedImage, maxWidth, maxHeight);
            ImageIO.write(bufferedImage, "jpg", new File(newPath));
            System.out.println("生成图片完成!");
        }
    }
    
    private static BufferedImage zoomInImage(BufferedImage originalImage, int maxWidth, int maxHeight) {
        BufferedImage newImage = new BufferedImage(maxWidth, maxHeight, originalImage.getType());
        Graphics g = newImage.getGraphics();
        g.drawImage(originalImage, 0, 0, maxWidth, maxHeight, null);
        g.dispose();
        return newImage;
    }
    
}

不需要对宽和高进行判断,在传参时直接给定宽高就行了.如width * 2, height * 2,width * 0.6, height * 0.6,如果宽高比例不同,图片失真会比较大,太过放大图片也会明显失真.