MultipartFile 转成FileInputStream

要将MultipartFile转换为FileInputStream，您可以使用以下代码：

import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import org.springframework.web.multipart.MultipartFile;

public InputStream multipartToInputStream(MultipartFile multipartFile) throws IOException {
    InputStream inputStream = null;
    File file = null;
    try {
        file = File.createTempFile("temp", null);
        multipartFile.transferTo(file);
        inputStream = new FileInputStream(file);
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        file.deleteOnExit();
        inputStream.close();
    }
    return inputStream;
}

此方法将MultipartFile转换为临时文件，并使用FileInputStream从文件中创建InputStream。请注意，在转换过程中，需要确保使用`transferTo(file)`方法将MultipartFile写入临时文件。最后，记得在适当的地方关闭InputStream并删除临时文件以释放资源。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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