testrewrite.java

java 读写word excel ppt

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   this work for additional information regarding copyright ownership.
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       http://www.apache.org/licenses/LICENSE-2.0

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   distributed under the License is distributed on an "AS IS" BASIS,
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   See the License for the specific language governing permissions and
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package org.apache.poi.hslf;


import junit.framework.TestCase;
import java.io.*;

import org.apache.poi.hslf.usermodel.SlideShow;
import org.apache.poi.poifs.filesystem.*;

/**
 * Tests that HSLFSlideShow writes the powerpoint bit of data back out
 *  correctly. Currently, that means being the same as what it read in
 *
 * @author Nick Burch (nick at torchbox dot com)
 */
public class TestReWrite extends TestCase {
	// HSLFSlideShow primed on the test data
	private HSLFSlideShow hssA;
	private HSLFSlideShow hssB;
	// POIFS primed on the test data
	private POIFSFileSystem pfsA;
	private POIFSFileSystem pfsB;

    public void setUp() throws Exception {
		String dirname = System.getProperty("HSLF.testdata.path");
		
		String filenameA = dirname + "/basic_test_ppt_file.ppt";
		FileInputStream fisA = new FileInputStream(filenameA);
		pfsA = new POIFSFileSystem(fisA);
		hssA = new HSLFSlideShow(pfsA);
		
		String filenameB = dirname + "/ParagraphStylesShorterThanCharStyles.ppt";
		FileInputStream fisB = new FileInputStream(filenameB);
		pfsB = new POIFSFileSystem(fisB);
		hssB = new HSLFSlideShow(pfsB);
    }

    public void testWritesOutTheSame() throws Exception {
    	assertWritesOutTheSame(hssA, pfsA);
    	assertWritesOutTheSame(hssB, pfsB);
    }
    public void assertWritesOutTheSame(HSLFSlideShow hss, POIFSFileSystem pfs) throws Exception {
		// Write out to a byte array
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		hss.write(baos);

		// Build an input stream of it
		ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());

		// Use POIFS to query that lot
		POIFSFileSystem npfs = new POIFSFileSystem(bais);

		// Check that the "PowerPoint Document" sections have the same size
		DocumentEntry oProps = (DocumentEntry)pfs.getRoot().getEntry("PowerPoint Document");
		DocumentEntry nProps = (DocumentEntry)npfs.getRoot().getEntry("PowerPoint Document");
		assertEquals(oProps.getSize(),nProps.getSize());

		// Check that they contain the same data
		byte[] _oData = new byte[oProps.getSize()];
		byte[] _nData = new byte[nProps.getSize()];
		pfs.createDocumentInputStream("PowerPoint Document").read(_oData);
		npfs.createDocumentInputStream("PowerPoint Document").read(_nData);
		for(int i=0; i<_oData.length; i++) {
			//System.out.println(i + "\t" + Integer.toHexString(i));
			assertEquals(_oData[i], _nData[i]);
		}
	}

    /**
     * Ensure that simply opening a slideshow (usermodel) view of it
     *  doesn't change things 
     */
    public void testSlideShowWritesOutTheSame() throws Exception {
    	assertSlideShowWritesOutTheSame(hssA, pfsA);
    	
    	// Some bug in StyleTextPropAtom rewriting means this will fail
    	// We need to identify and fix that first
    	//assertSlideShowWritesOutTheSame(hssB, pfsB);
    }
    public void assertSlideShowWritesOutTheSame(HSLFSlideShow hss, POIFSFileSystem pfs) throws Exception {
    	// Create a slideshow covering it
    	SlideShow ss = new SlideShow(hss);
    	ss.getSlides();
    	ss.getNotes();
    	
		// Now write out to a byte array
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		hss.write(baos);

		// Build an input stream of it
		ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());

		// Use POIFS to query that lot
		POIFSFileSystem npfs = new POIFSFileSystem(bais);

		// Check that the "PowerPoint Document" sections have the same size
		DocumentEntry oProps = (DocumentEntry)pfs.getRoot().getEntry("PowerPoint Document");
		DocumentEntry nProps = (DocumentEntry)npfs.getRoot().getEntry("PowerPoint Document");
		assertEquals(oProps.getSize(),nProps.getSize());

		// Check that they contain the same data
		byte[] _oData = new byte[oProps.getSize()];
		byte[] _nData = new byte[nProps.getSize()];
		pfs.createDocumentInputStream("PowerPoint Document").read(_oData);
		npfs.createDocumentInputStream("PowerPoint Document").read(_nData);
		for(int i=0; i<_oData.length; i++) {
			if(_oData[i] != _nData[i])
				System.out.println(i + "\t" + Integer.toHexString(i));
			assertEquals(_oData[i], _nData[i]);
		}
	}
}