public static String bmp2Jpeg(String filePath, String outPath) {
?? ?try {
?? ??? ?long start = System.currentTimeMillis();
?? ??? ?// 加載bmp圖片
?? ??? ?File file = new File(filePath);
?? ??? ?Image img = ImageIO.read(file);
?? ??? ?BufferedImage tag = new BufferedImage(img.getWidth(null), img.getHeight(null), BufferedImage.TYPE_INT_RGB);
?? ??? ?tag.getGraphics().drawImage(img.getScaledInstance(img.getWidth(null), img.getHeight(null), Image.SCALE_SMOOTH), 0, 0, null);

?? ??? ?// 輸出為Jpeg
?? ??? ?FileOutputStream out = new FileOutputStream(outPath);
?? ??? ?// JPEGImageEncoder可適用于其他圖片類型的轉(zhuǎn)換
?? ??? ?JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
?? ??? ?encoder.encode(tag);
?? ??? ?out.close();
?? ??? ?
?? ??? ?log.info("bmp 轉(zhuǎn) JPEG，共耗時： ?" + (System.currentTimeMillis() - start) + " 毫秒");
?? ??? ?return outPath;
?? ?} catch (IOException e) {
?? ??? ?e.printStackTrace();
?? ?}
?? ??? ?return outPath;
?? ?}

public static void jpeg2Bmp(String inputPath, String outputPath) {
    try {
        long start = System.currentTimeMillis();
    
        // 加載Jpeg圖片資源
        FileImageInputStream fiis = new FileImageInputStream(new File(inputPath));
        FileImageOutputStream fios = new FileImageOutputStream(new File(outputPath));
        ImageReader jpegReader = null;
        Iterator<ImageReader> it1 = ImageIO.getImageReadersByFormatName("jpeg");
        if (it1.hasNext()) {
            jpegReader = it1.next();
        }
        jpegReader.setInput(fiis);
        
        ImageWriter bmpWriter = null;
        Iterator<ImageWriter> it2 = ImageIO.getImageWritersByFormatName("bmp");
        if (it2.hasNext()) {
            bmpWriter = it2.next();
        }
        bmpWriter.setOutput(fios);
        BufferedImage br = jpegReader.read(0);
        bmpWriter.write(br);
        fiis.close();
        fios.close();
        
        log.info("jpeg 轉(zhuǎn) bmp，共耗時：" + (System.currentTimeMillis() - start) + " 毫秒");
    } catch (IOException e) {
        e.printStackTrace();
    }
}