MultipartFile 如何转换成File

MultipartFile可以通过以下三种方式转换成File：

1.使用transferTo()方法将MultipartFile转换成File：

public File transferToFile(MultipartFile multipartFile) {
    File file = null;
    try {
        String originalFilename = multipartFile.getOriginalFilename();
        String[] filename = originalFilename.split("\\.");
        file=File.createTempFile(filename[0], filename[1]);
        multipartFile.transferTo(file);
        file.deleteOnExit();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return file;
}

2.使用FileUtils.copyInputStreamToFile()方法将MultipartFile转换成File：

File file = new File(path);
FileUtils.copyInputStreamToFile(multipartFile.getInputStream(), file);

3.使用NIO将MultipartFile转换成File：

public File transferToFile(MultipartFile multipartFile) {
    File file = null;
    try {
        String originalFilename = multipartFile.getOriginalFilename();
        String[] filename = originalFilename.split("\\.");
        file=File.createTempFile(filename[0], filename[1]);
        FileOutputStream fos = new FileOutputStream(file);        FileChannel channel = fos.getChannel();
        channel.write(ByteBuffer.wrap(multipartFile.getBytes()));
        channel.close();
        fos.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return file;
}