压缩图片（java）

一，简单压缩（速度快）

public static void main(String[] args) {
        TimeInterval timer = DateUtil.timer();
        try {
            String basePath = Thread.currentThread().getContextClassLoader().getResource("").getPath();
            System.out.println(basePath);
            File input = new File(basePath+"static/9.jpg");
            BufferedImage image = ImageIO.read(input);

            Iterator<ImageWriter> writers = ImageIO.getImageWritersByFormatName("jpg");
            ImageWriter writer = (ImageWriter) writers.next();

            File compressedImageFile = new File("yasuo9.jpg");
            OutputStream os = new FileOutputStream(compressedImageFile);
            ImageOutputStream ios = ImageIO.createImageOutputStream(os);
            writer.setOutput(ios);

            ImageWriteParam param = writer.getDefaultWriteParam();

            param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
            param.setCompressionQuality(0.1f);

            writer.write(null, new IIOImage(image, null, null), param);

            os.close();
            ios.close();
            writer.dispose();

        } catch (IOException e) {
            e.printStackTrace();
        }
        System.err.println( timer.intervalMs());
    }

二、可添水印、设置长宽，等比缩小，添加缩略图等（速度稍微慢点）

<dependency>
    <groupId>net.coobird</groupId>
    <artifactId>thumbnailator</artifactId>
    <version>0.4.18</version>
</dependency>
    
<!-- hutool工具包 -->
<dependency>
    <groupId>cn.hutool</groupId>
    <artifactId>hutool-all</artifactId>
    <version>5.7.6</version>
</dependency>

    public static void main(String[] args) throws IOException {

        TimeInterval timer = DateUtil.timer();
        try {
            String basePath = Thread.currentThread().getContextClassLoader().getResource("").getPath();
            System.out.println(basePath);
    //        Thumbnails.of(new File(basePath+"static/5.jpg"))
    //                .size(300, 400).watermark(Positions.BOTTOM_RIGHT, ImageIO.read(new File(
    //                "F:/intellij idea3/target/classes/timg.jpg")),0.1f)
    //                .outputQuality(0.8f).toFile("6.jpg");
            Thumbnails.of(new File(basePath+"static/9.jpg")).scale(1f).outputQuality(0.1f).toFile("7.jpg");
        } catch (IOException e) {
            e.printStackTrace();
        }
        System.err.println( timer.intervalMs());

    }