视频

以下是测试了三种图片压缩方式，通过测试发现使用jdk的ImageIO压缩时间更短，使用Google的thumbnailator更简单，但是thumbnailator在GitHub上的源码已经停止维护了。

1、Google的thumbnailator

pom.xml中引入依赖

<dependency>
    <groupId>net.coobird</groupId>
    <artifactId>thumbnailator</artifactId>
    <version>0.4.8</version>
</dependency>

测试源码：

/**
 * @Title: ThumbnailatorUtil
 * @Package: com.test.image
 * @Description: google Thumbnailator 测试
 * @Author: monkjavaer
 * @Data: 2019/2/22 14:07
 * @Version: V1.0
 */
public class ThumbnailatorUtil {
 
    public static void main(String[] args) {
        try {
            long start = System.nanoTime();
            compressPic();
            long end = System.nanoTime();
            System.out.println("压缩时间："+(end-start)*0.000000001+"s");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
 
    /**
     * scale: 按比例
     * outputQuality：输出的图片质量，范围：0.0~1.0，1为最高质量。注意使用该方法时输出的图片格式必须为jpg
     * @throws IOException
     */
    public static void compressPic() throws IOException {
//        Thumbnails.of("E:\\3.png")
        Thumbnails.of("E:\\154.jpg")
                .scale(1f)
                .outputQuality(0.25f)
                .toFile("E:\\1.jpg");
    }
}

输出：压缩时间：0.5615769580000001s

2、Java原生ImageIO实现：

/**
 * @Title: ImageIOUtil
 * @Package: com.test.image
 * @Description: ImageIO test
 * @Author: monkjavaer
 * @Data: 2019/2/22 16:37
 * @Version: V1.0
 */
public class ImageIOUtil {
 
    public static void main(String[] args) throws IOException {
        long start = System.nanoTime();
        compressPic("E:\\154.jpg", "E:\\1.jpg", 0.25f);
        long end = System.nanoTime();
        System.out.println("压缩时间：" + (end - start) * 0.000000001 + "s");
    }
 
    public static void  compressPic(String srcFilePath, String descFilePath, Float quality) throws IOException {
        File input = new File(srcFilePath);
        BufferedImage image = ImageIO.read(input);
 
        // 指定写图片的方式为 jpg
        ImageWriter writer =  ImageIO.getImageWritersByFormatName("jpg").next();
 
        // 先指定Output，才能调用writer.write方法
        File output = new File(descFilePath);
        OutputStream out = new FileOutputStream(output);
        ImageOutputStream ios = ImageIO.createImageOutputStream(out);
        writer.setOutput(ios);
 
        ImageWriteParam param = writer.getDefaultWriteParam();
        if (param.canWriteCompressed()){
            // 指定压缩方式为MODE_EXPLICIT
            param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
            // 压缩程度，参数qality是取值0~1范围内
            param.setCompressionQuality(quality);
        }
        // 调用write方法，向输入流写图片
        writer.write(null, new IIOImage(image, null, null), param);
 
        out.close();
        ios.close();
        writer.dispose();
    }
}

输出：压缩时间：0.44548557000000005s

3、com.sun.image.codec.jpeg.JPEGCodec实现

测试代码：

public class JPEGCodecUtil {
    public static void main(String[] args) throws IOException {
        long start = System.nanoTime();
        compressPic(new File("E:\\154.jpg"), new File("E:\\1.jpg"), 1920, 0.25f);
        long end = System.nanoTime();
        System.out.println("压缩时间：" + (end - start) * 0.000000001 + "s");
    }
 
    /**
     * 缩放图片(压缩图片质量，改变图片尺寸)
     * 若原图宽度小于新宽度，则宽度不变！
     * @param newWidth 新的宽度
     * @param quality 图片质量参数 0.7f 相当于70%质量
     * 2015年12月11日
     */
    public static void compressPic(File originalFile, File resizedFile,
                              int newWidth, float quality) throws IOException {
 
        if (quality > 1) {
            throw new IllegalArgumentException(
                    "Quality has to be between 0 and 1");
        }
 
        ImageIcon ii = new ImageIcon(originalFile.getCanonicalPath());
        Image i = ii.getImage();
        Image resizedImage = null;
 
        int iWidth = i.getWidth(null);
        int iHeight = i.getHeight(null);
 
        if(iWidth < newWidth){
            newWidth = iWidth;
        }
        if (iWidth > iHeight) {
            resizedImage = i.getScaledInstance(newWidth, (newWidth * iHeight)
                    / iWidth, Image.SCALE_SMOOTH);
        } else {
            resizedImage = i.getScaledInstance((newWidth * iWidth) / iHeight,
                    newWidth, Image.SCALE_SMOOTH);
        }
 
        // This code ensures that all the pixels in the image are loaded.
        Image temp = new ImageIcon(resizedImage).getImage();
 
        // Create the buffered image.
        BufferedImage bufferedImage = new BufferedImage(temp.getWidth(null),
                temp.getHeight(null), BufferedImage.TYPE_INT_RGB);
 
        // Copy image to buffered image.
        Graphics g = bufferedImage.createGraphics();
 
        // Clear background and paint the image.
        g.setColor(Color.white);
        g.fillRect(0, 0, temp.getWidth(null), temp.getHeight(null));
        g.drawImage(temp, 0, 0, null);
        g.dispose();
 
        // Soften.
        float softenFactor = 0.05f;
        float[] softenArray = { 0, softenFactor, 0, softenFactor,
                1 - (softenFactor * 4), softenFactor, 0, softenFactor, 0 };
        Kernel kernel = new Kernel(3, 3, softenArray);
        ConvolveOp cOp = new ConvolveOp(kernel, ConvolveOp.EDGE_NO_OP, null);
        bufferedImage = cOp.filter(bufferedImage, null);
 
        // Write the jpeg to a file.
        FileOutputStream out = new FileOutputStream(resizedFile);
 
        // Encodes image as a JPEG data stream
        JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
 
        JPEGEncodeParam param = encoder
                .getDefaultJPEGEncodeParam(bufferedImage);
 
        param.setQuality(quality, true);
 
        encoder.setJPEGEncodeParam(param);
        encoder.encode(bufferedImage);
    } // Example usage
}

输出：压缩时间：0.52596054s

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