图像处理 -Java- 指定大小压缩

package com.pap.base.util.image;
import javax.imageio.ImageIO;import javax.imageio.ImageWriteParam;import javax.imageio.ImageWriter;import javax.imageio.stream.FileImageOutputStream;import java.awt.image.BufferedImage;import java.io.File;import java.io.IOException;import java.util.Iterator;
public class JPGCompressTest {
    // 输入图像绝对路径、输出图像绝对路径、期望的图像大小    public static void convertJpg(String inputImagePath, String outputImagePath, double targetSizeBytes) throws IOException {        File inputFile = new File(inputImagePath);        File outputFile = new File(outputImagePath);
        long currentSize = inputFile.length();        float quality = 0.5f;
        while (currentSize > targetSizeBytes && quality > 0.1f) {            BufferedImage bufferedImage = ImageIO.read(inputFile);            writeJpgWithQuality(bufferedImage, outputFile, quality);
            currentSize = outputFile.length();            quality -= 0.005f;        }
        while (currentSize < targetSizeBytes) {            BufferedImage bufferedImage = ImageIO.read(inputFile);            writeJpgWithQuality(bufferedImage, outputFile, quality);
            currentSize = outputFile.length();            quality += 0.005f;        }
    }
    private static void writeJpgWithQuality(BufferedImage image, File outputFile, float quality) throws IOException {        Iterator<ImageWriter> writers = ImageIO.getImageWritersByFormatName("jpg");        if (writers.hasNext()) {            ImageWriter writer = writers.next();            ImageWriteParam param = writer.getDefaultWriteParam();
            param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);            param.setCompressionQuality(quality);
            try (FileImageOutputStream output = new FileImageOutputStream(outputFile)) {                writer.setOutput(output);                writer.write(null, new javax.imageio.IIOImage(image, null, null), param);            } finally {                writer.dispose();            }        }    }}