java 解压MultipartFile 文件

可以使用Java的ZipInputStream类来解压MultipartFile文件。具体步骤如下：

1. 获取MultipartFile文件的输入流
2. 创建ZipInputStream对象，将MultipartFile文件的输入流传入
3. 循环读取ZipInputStream中的ZipEntry对象，将每个ZipEntry对象的内容写入到输出流中
4. 关闭输入流和输出流

以下是示例代码：

public void unzip(MultipartFile file) throws IOException {
    ZipInputStream zipInputStream = new ZipInputStream(file.getInputStream());
    ZipEntry zipEntry = zipInputStream.getNextEntry();
    while (zipEntry != null) {
        String fileName = zipEntry.getName();
        File newFile = new File(fileName);
        FileOutputStream fos = new FileOutputStream(newFile);
        byte[] buffer = new byte[1024];
        int len;
        while ((len = zipInputStream.read(buffer)) > 0) {
            fos.write(buffer, 0, len);
        }
        fos.close();
        zipEntry = zipInputStream.getNextEntry();
    }
    zipInputStream.closeEntry();
    zipInputStream.close();
}