java springboot 图片保质 指定精度压缩

一、ImgaeHelper类，对图片压缩，返回BufferedImage

package com.ruoyi.common.utils;

import org.junit.jupiter.api.Test;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.WritableRaster;
import java.io.*;
/**
 * 图片工具类，完成图片的截取
 * 所有方法返回值均未boolean型
 */
public class ImageHelper {

    /**
     * 实现图像的等比缩放
     * @param source
     * @param targetW
     * @param targetH
     * @return
     */
    private static BufferedImage resize(BufferedImage source, int targetW,
                                        int targetH) {
        // targetW，targetH分别表示目标长和宽
        int type = source.getType();
        BufferedImage target = null;
        double sx = (double) targetW / source.getWidth();
        double sy = (double) targetH / source.getHeight();
        // 这里想实现在targetW，targetH范围内实现等比缩放。如果不需要等比缩放
        // 则将下面的if else语句注释即可
        if (sx < sy) {
            sx = sy;
            targetW = (int) (sx * source.getWidth());
        } else {
            sy = sx;
            targetH = (int) (sy * source.getHeight());
        }
        if (type == BufferedImage.TYPE_CUSTOM) { // handmade
            ColorModel cm = source.getColorModel();
            WritableRaster raster = cm.createCompatibleWritableRaster(targetW,
                    targetH);
            boolean alphaPremultiplied = cm.isAlphaPremultiplied();
            target = new BufferedImage(cm, raster, alphaPremultiplied, null);
        } else
            target = new BufferedImage(targetW, targetH, type);
        Graphics2D g = target.createGraphics();
        // smoother than exlax:
        g.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
                RenderingHints.VALUE_INTERPOLATION_BICUBIC);
        g.drawRenderedImage(source, AffineTransform.getScaleInstance(sx, sy));
        g.dispose();
        return target;
    }

    /**
     * 实现图像的等比缩放和缩放后的截取, 处理成功返回true, 否则返回false
     * @param inFilePath 要截取文件的路径
     * @param outFilePath 截取后输出的路径
     * @param width 要截取宽度
     * @param hight 要截取的高度
     * @throws Exception
     */
    public static boolean compress(String inFilePath, String outFilePath,
                                   int width, int hight) {
        boolean ret = false;
        File file = new File(inFilePath);
        File saveFile = new File(outFilePath);
        InputStream in = null;
        try {
            in = new FileInputStream(file);
            ret = compress(in, saveFile, width, hight);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
            ret = false;
        } finally{
            if(null != in){
                try {
                    in.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

        return ret;
    }

    /**
     * 实现图像的等比缩放和缩放后的截取, 处理成功返回true, 否则返回false
     * @param in 要截取文件流
     * @param outFilePath 截取后输出的路径
     * @param width 要截取宽度
     * @param hight 要截取的高度
     * @throws Exception
     */
    public static boolean compress(InputStream in, File saveFile,
                                   int width, int hight) {
//     boolean ret = false;
        BufferedImage srcImage = null;
        try {
            srcImage = ImageIO.read(in);
        } catch (IOException e) {