why doc.getDataStream().length return 0

[jia <ji...@hotmail.com>]

Hi every one,

I'm new to Java and POI. Forgive me if the question is stupid. 

I wrote the program to test POI, but dataStream is "empty". Any help is
appreciated.


import java.io.FileInputStream;
import java.io.IOException;

import org.apache.poi.hwpf.HWPFDocument;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;

public class PoiTest {
	public static void main( String[] args ) throws IOException {
	String fileName = "C:/hello.doc";
	POIFSFileSystem fs = new POIFSFileSystem( new FileInputStream( fileName )
);
        HWPFDocument document = new HWPFDocument(fs);
        byte[] stream = document.getDataStream();
        System.out.println( stream.length );
	}
}


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