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Streaming Excel reader

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package com.github.pjfanning.xlsx.impl;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;

public class TempFileUtil {
 public static File writeInputStreamToFile(InputStream is, int bufferSize) throws IOException {
   File f = Files.createTempFile("tmp-", ".xlsx").toFile();
   try(FileOutputStream fos = new FileOutputStream(f)) {
     int read;
     byte[] bytes = new byte[bufferSize];
     while((read = is.read(bytes)) != -1) {
       fos.write(bytes, 0, read);
     }
     return f;
   } finally {
     is.close();
   }
 }
}