poi/src/integrationtest/org/apache/poi/stress/XSSFFileHandler.java

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   this work for additional information regarding copyright ownership.
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package org.apache.poi.stress;

import org.apache.poi.POIXMLException;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.openxml4j.exceptions.OLE2NotOfficeXmlFileException;
import org.apache.poi.openxml4j.exceptions.OpenXML4JException;
import org.apache.poi.openxml4j.opc.OPCPackage;
import org.apache.poi.util.IOUtils;
import org.apache.poi.xssf.eventusermodel.XLSX2CSV;
import org.apache.poi.xssf.eventusermodel.XSSFReader;
import org.apache.poi.xssf.eventusermodel.examples.FromHowTo;
import org.apache.poi.xssf.extractor.XSSFExportToXml;
import org.apache.poi.xssf.usermodel.XSSFMap;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.junit.Test;
import org.xml.sax.SAXException;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.TransformerException;
import java.io.*;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Locale;
import java.util.Set;

import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotNull;

public class XSSFFileHandler extends SpreadsheetHandler {
    @Override
    public void handleFile(InputStream stream) throws Exception {
        // ignore password protected files
        if (POIXMLDocumentHandler.isEncrypted(stream)) return;

        final XSSFWorkbook wb;

        // make sure the potentially large byte-array is freed up quickly again
        {
	        ByteArrayOutputStream out = new ByteArrayOutputStream();
	        IOUtils.copy(stream, out);
	        final byte[] bytes = out.toByteArray();

	        checkXSSFReader(OPCPackage.open(new ByteArrayInputStream(bytes)));

	        wb = new XSSFWorkbook(new ByteArrayInputStream(bytes));
        }

        // use the combined handler for HSSF/XSSF
        handleWorkbook(wb);
        
        // TODO: some documents fail currently...
        //XSSFFormulaEvaluator evaluator = new XSSFFormulaEvaluator(wb);
        //evaluator.evaluateAll();

        // also verify general POIFS-stuff
        new POIXMLDocumentHandler().handlePOIXMLDocument(wb);
        
        // and finally ensure that exporting to XML works
        exportToXML(wb);

        // this allows to trigger a heap-dump at this point to see which memory is still allocated
        //HeapDump.dumpHeap("/tmp/poi.hprof", false);
    }


    private void checkXSSFReader(OPCPackage p) throws IOException, OpenXML4JException {
        XSSFReader reader = new XSSFReader(p);
        
        // these can be null...
        InputStream sharedStringsData = reader.getSharedStringsData();
        if(sharedStringsData != null) {
            sharedStringsData.close();
        }
        reader.getSharedStringsTable();

        InputStream stylesData = reader.getStylesData();
        if(stylesData != null) {
            stylesData.close();
        }
        reader.getStylesTable();
        
        InputStream themesData = reader.getThemesData();
        if(themesData != null) {
            themesData.close();
        }

        assertNotNull(reader.getWorkbookData());
        
        Iterator<InputStream> sheetsData = reader.getSheetsData();
        while(sheetsData.hasNext()) {
            InputStream str = sheetsData.next();
            str.close();
        }
    }
    
    private void exportToXML(XSSFWorkbook wb) throws SAXException,
            ParserConfigurationException, TransformerException {
        for (XSSFMap map : wb.getCustomXMLMappings()) {
            XSSFExportToXml exporter = new XSSFExportToXml(map);

            ByteArrayOutputStream os = new ByteArrayOutputStream();
            exporter.exportToXML(os, true);
        }
    }

    private static final Set<String> EXPECTED_ADDITIONAL_FAILURES = new HashSet<String>();
    static {
        // expected sheet-id not found
        // EXPECTED_ADDITIONAL_FAILURES.add("spreadsheet/52348.xlsx");
        // EXPECTED_ADDITIONAL_FAILURES.add("spreadsheet/59021.xlsx");
        // zip-bomb
        EXPECTED_ADDITIONAL_FAILURES.add("spreadsheet/54764.xlsx");
        EXPECTED_ADDITIONAL_FAILURES.add("spreadsheet/54764-2.xlsx");
        EXPECTED_ADDITIONAL_FAILURES.add("spreadsheet/54764.xlsx");
        EXPECTED_ADDITIONAL_FAILURES.add("spreadsheet/poc-xmlbomb.xlsx");
        EXPECTED_ADDITIONAL_FAILURES.add("spreadsheet/poc-xmlbomb-empty.xlsx");
        // strict OOXML
        EXPECTED_ADDITIONAL_FAILURES.add("spreadsheet/57914.xlsx");
        EXPECTED_ADDITIONAL_FAILURES.add("spreadsheet/SampleSS.strict.xlsx");
        EXPECTED_ADDITIONAL_FAILURES.add("spreadsheet/SimpleStrict.xlsx");
        EXPECTED_ADDITIONAL_FAILURES.add("spreadsheet/sample.strict.xlsx");
        // TODO: good to ignore?
        EXPECTED_ADDITIONAL_FAILURES.add("spreadsheet/sample-beta.xlsx");

        // corrupt/invalid
        EXPECTED_ADDITIONAL_FAILURES.add("openxml4j/invalid.xlsx");
    }

    @SuppressWarnings("resource")
    @Override
    public void handleAdditional(File file) throws Exception {
        // redirect stdout as the examples often write lots of text
        PrintStream oldOut = System.out;
        try {
            System.setOut(new NullPrintStream());
            FromHowTo.main(new String[]{file.getAbsolutePath()});
            XLSX2CSV.main(new String[]{file.getAbsolutePath()});

            assertFalse("Expected Extraction to fail for file " + file + " and handler " + this + ", but did not fail!",
                    EXPECTED_ADDITIONAL_FAILURES.contains(file.getParentFile().getName() + "/" + file.getName()));

        } catch (OLE2NotOfficeXmlFileException e) {
            // we have some files that are not actually OOXML and thus cannot be tested here
        } catch (IllegalArgumentException e) {
            if(!EXPECTED_ADDITIONAL_FAILURES.contains(file.getParentFile().getName() + "/" + file.getName())) {
                throw e;
            }
        } catch (InvalidFormatException e) {
            if(!EXPECTED_ADDITIONAL_FAILURES.contains(file.getParentFile().getName() + "/" + file.getName())) {
                throw e;
            }
        } catch (IOException e) {
            if(!EXPECTED_ADDITIONAL_FAILURES.contains(file.getParentFile().getName() + "/" + file.getName())) {
                throw e;
            }
        } catch (POIXMLException e) {
            if(!EXPECTED_ADDITIONAL_FAILURES.contains(file.getParentFile().getName() + "/" + file.getName())) {
                throw e;
            }
        } finally {
            System.setOut(oldOut);
        }
    }

    // a test-case to test this locally without executing the full TestAllFiles
    @Test
    public void test() throws Exception {
        File file = new File("test-data/spreadsheet/ref-56737.xlsx");

        InputStream stream = new BufferedInputStream(new FileInputStream(file));
        try {
            handleFile(stream);
        } finally {
            stream.close();
        }

        handleExtracting(file);
    }

    @Test
    public void testAdditional() throws Exception {
        handleAdditional(new File("test-data/spreadsheet/poc-xmlbomb.xlsx"));
    }
    
    // need to override all methods to omit calls to UTF-handling methods 
    static class NullPrintStream extends PrintStream {
        @SuppressWarnings("resource")
        NullPrintStream() {
            super(new OutputStream() {
                @Override
                public void write(int b) {}
                @Override
                public void write(byte[] b) {}
                @Override
                public void write(byte[] b, int off, int len) {}
            });
        }
        @Override
        public void write(int b) {}
        @Override
        public void write(byte[] buf, int off, int len) {}
        @Override
        public void print(boolean b) {}
        @Override
        public void print(char c) {}
        @Override
        public void print(int i) {}
        @Override
        public void print(long l) {}
        @Override
        public void print(float f) {}
        @Override
        public void print(double d) {}
        @Override
        public void print(char[] s) {}
        @Override
        public void print(String s) {}
        @Override
        public void print(Object obj) {}
        @Override
        public void println() {}
        @Override
        public void println(boolean x) {}
        @Override
        public void println(char x) {}
        @Override
        public void println(int x) {}
        @Override
        public void println(long x) {}
        @Override
        public void println(float x) {}
        @Override
        public void println(double x) {}
        @Override
        public void println(char[] x) {}
        @Override
        public void println(String x) {}
        @Override
        public void println(Object x) {}
        @Override
        public PrintStream printf(String format, Object... args) { return this; }
        @Override
        public PrintStream printf(Locale l, String format, Object... args) { return this; }
        @Override
        public PrintStream format(String format, Object... args) { return this; }
        @Override
        public PrintStream format(Locale l, String format, Object... args) { return this; }
        @Override
        public PrintStream append(CharSequence csq) { return this; }
        @Override
        public PrintStream append(CharSequence csq, int start, int end) { return this; }
        @Override
        public PrintStream append(char c) { return this; }
        @Override
        public void write(byte[] b) {}
    }
}