使用thumbnailator实现图片压缩

发布时间:2024年01月11日

前言

最近在做图片上传的功能,图片大小需满足小于100K。

环境准备

需要引入依赖

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

代码

public class LssTest {

    public static void main(String[] args) throws Exception {
        //加载本地测试图片
        byte[] bytes = FileUtils.readFileToByteArray(new File("C:\\Users\\Administrator\\Desktop\\111.jpeg"));
        byte[] compImg = compress(bytes, 100);
        //byte[] compImg = commpressCycle(bytes, 100);
        //输出压缩后的图片
        try (OutputStream out = new FileOutputStream("C:\\Users\\Administrator\\Desktop\\222.jpeg")) {
            out.write(compImg);
            out.flush();
        }
    }

    //方式一
    public static byte[] compress(byte[] imgBytes, long fixedSize) throws Exception {
        //大小判断
        if (imgBytes == null || imgBytes.length <= 0 || imgBytes.length < fixedSize * 1024) {
            return imgBytes;
        }
        long imgSize = imgBytes.length;
        //获取压缩程度,取值0~1范围内
        double quality = getQuality(imgSize / 1024);
        try {
            //循环压缩直到满足要求
            while (imgBytes.length > fixedSize * 1024) {
                try (ByteArrayInputStream inputStream = new ByteArrayInputStream(imgBytes);
                     ByteArrayOutputStream outputStream = new ByteArrayOutputStream(imgBytes.length)) {
                    Thumbnails.of(inputStream)
                            .scale(quality)
                            .outputQuality(quality)
                            .toOutputStream(outputStream);
                    imgBytes = outputStream.toByteArray();
                }
            }
            System.out.println("图片压缩,原大小:" + imgSize / 1024 + "kb,压缩后大小:" +imgBytes.length / 1024 + "kb");
        } catch (Exception e) {
            System.out.println("图片压缩失败:" + e);
        }
        //返回结果
        return imgBytes;
    }

    //方式二
    public static byte[] commpressCycle(byte[] imgBytes, long fixedSize) throws IOException {
        System.out.println("图片压缩,压缩前大小=" + imgBytes.length / 1024 + "kb");
        if (imgBytes == null || imgBytes.length <= 0 || imgBytes.length < fixedSize * 1024) {
            return imgBytes;
        }
        double quality = getQuality(imgBytes.length / 1024);
        try (ByteArrayInputStream inputStream = new ByteArrayInputStream(imgBytes);
             ByteArrayOutputStream outputStream = new ByteArrayOutputStream(imgBytes.length)) {
            Thumbnails.of(inputStream)
                    .scale(quality)
                    .outputQuality(quality)
                    .toOutputStream(outputStream);
            imgBytes = outputStream.toByteArray();
        }
        System.out.println("图片压缩,压缩后大小=" +imgBytes.length / 1024 + "kb");
        return commpressCycle(imgBytes, fixedSize);
    }

    private static double getQuality(long size) {
        if (size < 900) {
            return 0.85;
        } else if (size < 2047) {
            return 0.6;
        } else if (size < 3275) {
            return 0.44;
        }
        return 0.4;
    }

}

结果

文章来源:https://blog.csdn.net/Cnc2014/article/details/135509569
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