Thumbnails本地文件压缩及MultipartFile类型文件压缩后转MultipartFile

本地文件压缩

1.添加pom依赖

      <dependency>
            <groupId>net.coobird</groupId>
            <artifactId>thumbnailator</artifactId>
            <version>0.4.9</version>
      </dependency>

2.代码
Thumbnails.of("压缩前路径").scale(0.25f).toFile("压缩后路径");

MultipartFile类型文件压缩后转MultipartFile

1.添加pom依赖

      <dependency>
            <groupId>net.coobird</groupId>
            <artifactId>thumbnailator</artifactId>
            <version>0.4.9</version>
      </dependency>

2.代码 MultipartFile file

ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
Thumbnails.of(file.getInputStream())
                            .scale(0.9f)
                            .toOutputStream(outputStream);
byte[] bytes = outputStream.toByteArray();
                InputStream inputStream = new ByteArrayInputStream(bytes);
                MultipartFile mfileInfos = new MockMultipartFile(file.getOriginalFilename(), file.getOriginalFilename(), file.getContentType(), inputStream);

原文：https://www.cnblogs.com/xingqiang/p/13955557.html