http://poi.apache.org/: Apache POI - Java API To Access Microsoft Format Files (Apache Software Foundation) 
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   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
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   distributed under the License is distributed on an "AS IS" BASIS,
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package org.apache.poi.xssf.extractor;

import javax.xml.parsers.ParserConfigurationException;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;

import org.apache.poi.ooxml.POIXMLProperties;
import org.apache.poi.ooxml.POIXMLProperties.CoreProperties;
import org.apache.poi.ooxml.POIXMLProperties.CustomProperties;
import org.apache.poi.ooxml.POIXMLProperties.ExtendedProperties;
import org.apache.poi.ooxml.extractor.POIXMLTextExtractor;
import org.apache.poi.openxml4j.exceptions.OpenXML4JException;
import org.apache.poi.openxml4j.opc.OPCPackage;
import org.apache.poi.ss.usermodel.DataFormatter;
import org.apache.poi.util.POILogFactory;
import org.apache.poi.util.POILogger;
import org.apache.poi.ooxml.util.SAXHelper;
import org.apache.poi.xssf.eventusermodel.ReadOnlySharedStringsTable;
import org.apache.poi.xssf.eventusermodel.XSSFReader;
import org.apache.poi.xssf.eventusermodel.XSSFSheetXMLHandler;
import org.apache.poi.xssf.eventusermodel.XSSFSheetXMLHandler.SheetContentsHandler;
import org.apache.poi.xssf.model.*;
import org.apache.poi.xssf.usermodel.XSSFComment;
import org.apache.poi.xssf.usermodel.XSSFShape;
import org.apache.poi.xssf.usermodel.XSSFSimpleShape;
import org.apache.xmlbeans.XmlException;
import org.xml.sax.ContentHandler;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;


Implementation of a text extractor from OOXML Excel
files that uses SAX event based parsing.

/**
 * Implementation of a text extractor from OOXML Excel
 * files that uses SAX event based parsing.
 */
public class XSSFEventBasedExcelExtractor extends POIXMLTextExtractor
        implements org.apache.poi.ss.extractor.ExcelExtractor {

    private static final POILogger LOGGER = POILogFactory.getLogger(XSSFEventBasedExcelExtractor.class);

    protected OPCPackage container;
    protected POIXMLProperties properties;

    protected Locale locale;
    protected boolean includeTextBoxes = true;
    protected boolean includeSheetNames = true;
    protected boolean includeCellComments;
    protected boolean includeHeadersFooters = true;
    protected boolean formulasNotResults;
    protected boolean concatenatePhoneticRuns = true;

    public XSSFEventBasedExcelExtractor(String path) throws XmlException, OpenXML4JException, IOException {
        this(OPCPackage.open(path));
    }

    public XSSFEventBasedExcelExtractor(OPCPackage container) throws XmlException, OpenXML4JException, IOException {
        super(null);
        this.container = container;

        properties = new POIXMLProperties(container);
    }

    public static void main(String[] args) throws Exception {
        if (args.length < 1) {
            System.err.println("Use:");
            System.err.println("  XSSFEventBasedExcelExtractor <filename.xlsx>");
            System.exit(1);
        }
        POIXMLTextExtractor extractor =
                new XSSFEventBasedExcelExtractor(args[0]);
        System.out.println(extractor.getText());
        extractor.close();
    }

    
Should sheet names be included? Default is true

/**
     * Should sheet names be included? Default is true
     */
    public void setIncludeSheetNames(boolean includeSheetNames) {
        this.includeSheetNames = includeSheetNames;
    }


    
Returns:whether to include sheet names
Since:3.16-beta3
/**
     * @return whether to include sheet names
     * @since 3.16-beta3
     */
    public boolean getIncludeSheetNames() {
        return includeSheetNames;
    }

    
Should we return the formula itself, and not
the result it produces? Default is false

/**
     * Should we return the formula itself, and not
     * the result it produces? Default is false
     */
    public void setFormulasNotResults(boolean formulasNotResults) {
        this.formulasNotResults = formulasNotResults;
    }

    
Returns:whether to include formulas but not results
Since:3.16-beta3
/**
     * @return whether to include formulas but not results
     * @since 3.16-beta3
     */
    public boolean getFormulasNotResults() {
        return formulasNotResults;
    }

    
Should headers and footers be included? Default is true

/**
     * Should headers and footers be included? Default is true
     */
    public void setIncludeHeadersFooters(boolean includeHeadersFooters) {
        this.includeHeadersFooters = includeHeadersFooters;
    }

    
Returns:whether or not to include headers and footers
Since:3.16-beta3
/**
     * @return whether or not to include headers and footers
     * @since 3.16-beta3
     */
    public boolean getIncludeHeadersFooters() {
        return includeHeadersFooters;
    }

    
Should text from textboxes be included? Default is true

/**
     * Should text from textboxes be included? Default is true
     */
    public void setIncludeTextBoxes(boolean includeTextBoxes) {
        this.includeTextBoxes = includeTextBoxes;
    }

    
Returns:whether or not to extract textboxes
Since:3.16-beta3
/**
     * @return whether or not to extract textboxes
     * @since 3.16-beta3
     */
    public boolean getIncludeTextBoxes() {
        return includeTextBoxes;
    }

    
Should cell comments be included? Default is false

/**
     * Should cell comments be included? Default is false
     */
    public void setIncludeCellComments(boolean includeCellComments) {
        this.includeCellComments = includeCellComments;
    }

    
Returns:whether cell comments should be included
Since:3.16-beta3
/**
     * @return whether cell comments should be included
     * @since 3.16-beta3
     */
    public boolean getIncludeCellComments() {
        return includeCellComments;
    }

    
Concatenate text from <rPh> text elements in SharedStringsTable
Default is true;

Params:
  • concatenatePhoneticRuns – true if runs should be concatenated, false otherwise
/**
     * Concatenate text from &lt;rPh&gt; text elements in SharedStringsTable
     * Default is true;
     *
     * @param concatenatePhoneticRuns true if runs should be concatenated, false otherwise
     */
    public void setConcatenatePhoneticRuns(boolean concatenatePhoneticRuns) {
        this.concatenatePhoneticRuns = concatenatePhoneticRuns;
    }

    public void setLocale(Locale locale) {
        this.locale = locale;
    }

    
Returns:locale
Since:3.16-beta3
/**
     * @return locale
     * @since 3.16-beta3
     */
    public Locale getLocale() {
        return locale;
    }

    
Returns the opened OPCPackage container.

/**
     * Returns the opened OPCPackage container.
     */
    @Override
    public OPCPackage getPackage() {
        return container;
    }

    
Returns the core document properties

/**
     * Returns the core document properties
     */
    @Override
    public CoreProperties getCoreProperties() {
        return properties.getCoreProperties();
    }

    
Returns the extended document properties

/**
     * Returns the extended document properties
     */
    @Override
    public ExtendedProperties getExtendedProperties() {
        return properties.getExtendedProperties();
    }

    
Returns the custom document properties

/**
     * Returns the custom document properties
     */
    @Override
    public CustomProperties getCustomProperties() {
        return properties.getCustomProperties();
    }


    
Processes the given sheet

/**
     * Processes the given sheet
     */
    public void processSheet(
            SheetContentsHandler sheetContentsExtractor,
            Styles styles,
            Comments comments,
            SharedStrings strings,
            InputStream sheetInputStream)
            throws IOException, SAXException {

        DataFormatter formatter;
        if (locale == null) {
            formatter = new DataFormatter();
        } else {
            formatter = new DataFormatter(locale);
        }

        InputSource sheetSource = new InputSource(sheetInputStream);
        try {
            XMLReader sheetParser = SAXHelper.newXMLReader();
            ContentHandler handler = new XSSFSheetXMLHandler(
                    styles, comments, strings, sheetContentsExtractor, formatter, formulasNotResults);
            sheetParser.setContentHandler(handler);
            sheetParser.parse(sheetSource);
        } catch (ParserConfigurationException e) {
            throw new RuntimeException("SAX parser appears to be broken - " + e.getMessage());
        }
    }

    protected SharedStrings createSharedStringsTable(XSSFReader xssfReader, OPCPackage container)
            throws IOException, SAXException {
        return new ReadOnlySharedStringsTable(container, concatenatePhoneticRuns);
    }

    
Processes the file and returns the text

/**
     * Processes the file and returns the text
     */
    public String getText() {
        try {
            XSSFReader xssfReader = new XSSFReader(container);
            SharedStrings strings = createSharedStringsTable(xssfReader, container);
            StylesTable styles = xssfReader.getStylesTable();
            XSSFReader.SheetIterator iter = (XSSFReader.SheetIterator) xssfReader.getSheetsData();
            StringBuilder text = new StringBuilder(64);
            SheetTextExtractor sheetExtractor = new SheetTextExtractor();

            while (iter.hasNext()) {
                InputStream stream = iter.next();
                if (includeSheetNames) {
                    text.append(iter.getSheetName());
                    text.append('\n');
                }
                Comments comments = includeCellComments ? iter.getSheetComments() : null;
                processSheet(sheetExtractor, styles, comments, strings, stream);
                if (includeHeadersFooters) {
                    sheetExtractor.appendHeaderText(text);
                }
                sheetExtractor.appendCellText(text);
                if (includeTextBoxes) {
                    processShapes(iter.getShapes(), text);
                }
                if (includeHeadersFooters) {
                    sheetExtractor.appendFooterText(text);
                }
                sheetExtractor.reset();
                stream.close();
            }

            return text.toString();
        } catch (IOException | OpenXML4JException | SAXException e) {
            LOGGER.log(POILogger.WARN, e);
            return null;
        }
    }

    void processShapes(List<XSSFShape> shapes, StringBuilder text) {
        if (shapes == null) {
            return;
        }
        for (XSSFShape shape : shapes) {
            if (shape instanceof XSSFSimpleShape) {
                String sText = ((XSSFSimpleShape) shape).getText();
                if (sText != null && sText.length() > 0) {
                    text.append(sText).append('\n');
                }
            }
        }
    }

    @Override
    public void close() throws IOException {
        if (container != null) {
            container.close();
            container = null;
        }
        super.close();
    }

    protected class SheetTextExtractor implements SheetContentsHandler {
        private final StringBuilder output = new StringBuilder(64);
        private boolean firstCellOfRow;
        private final Map<String, String> headerFooterMap;

        protected SheetTextExtractor() {
            this.firstCellOfRow = true;
            this.headerFooterMap = includeHeadersFooters ? new HashMap<>() : null;
        }

        @Override
        public void startRow(int rowNum) {
            firstCellOfRow = true;
        }

        @Override
        public void endRow(int rowNum) {
            output.append('\n');
        }

        @Override
        public void cell(String cellRef, String formattedValue, XSSFComment comment) {
            if (firstCellOfRow) {
                firstCellOfRow = false;
            } else {
                output.append('\t');
            }
            if (formattedValue != null) {
                checkMaxTextSize(output, formattedValue);
                output.append(formattedValue);
            }
            if (includeCellComments && comment != null) {
                String commentText = comment.getString().getString().replace('\n', ' ');
                output.append(formattedValue != null ? " Comment by " : "Comment by ");
                checkMaxTextSize(output, commentText);
                if (commentText.startsWith(comment.getAuthor() + ": ")) {
                    output.append(commentText);
                } else {
                    output.append(comment.getAuthor()).append(": ").append(commentText);
                }
            }
        }

        @Override
        public void headerFooter(String text, boolean isHeader, String tagName) {
            if (headerFooterMap != null) {
                headerFooterMap.put(tagName, text);
            }
        }

        
Append the text for the named header or footer if found.

/**
         * Append the text for the named header or footer if found.
         */
        private void appendHeaderFooterText(StringBuilder buffer, String name) {
            String text = headerFooterMap.get(name);
            if (text != null && text.length() > 0) {
                // this is a naive way of handling the left, center, and right
                // header and footer delimiters, but it seems to be as good as
                // the method used by XSSFExcelExtractor
                text = handleHeaderFooterDelimiter(text, "&L");
                text = handleHeaderFooterDelimiter(text, "&C");
                text = handleHeaderFooterDelimiter(text, "&R");
                buffer.append(text).append('\n');
            }
        }

        
Remove the delimiter if its found at the beginning of the text,
or replace it with a tab if its in the middle.

/**
         * Remove the delimiter if its found at the beginning of the text,
         * or replace it with a tab if its in the middle.
         */
        private String handleHeaderFooterDelimiter(String text, String delimiter) {
            int index = text.indexOf(delimiter);
            if (index == 0) {
                text = text.substring(2);
            } else if (index > 0) {
                text = text.substring(0, index) + "\t" + text.substring(index + 2);
            }
            return text;
        }


        
Append the text for each header type in the same order
they are appended in XSSFExcelExtractor.

See Also:
/**
         * Append the text for each header type in the same order
         * they are appended in XSSFExcelExtractor.
         *
         * @see XSSFExcelExtractor#getText()
         * @see org.apache.poi.hssf.extractor.ExcelExtractor#_extractHeaderFooter(org.apache.poi.ss.usermodel.HeaderFooter)
         */
        void appendHeaderText(StringBuilder buffer) {
            appendHeaderFooterText(buffer, "firstHeader");
            appendHeaderFooterText(buffer, "oddHeader");
            appendHeaderFooterText(buffer, "evenHeader");
        }

        
Append the text for each footer type in the same order
they are appended in XSSFExcelExtractor.

See Also:
/**
         * Append the text for each footer type in the same order
         * they are appended in XSSFExcelExtractor.
         *
         * @see XSSFExcelExtractor#getText()
         * @see org.apache.poi.hssf.extractor.ExcelExtractor#_extractHeaderFooter(org.apache.poi.ss.usermodel.HeaderFooter)
         */
        void appendFooterText(StringBuilder buffer) {
            // append the text for each footer type in the same order
            // they are appended in XSSFExcelExtractor
            appendHeaderFooterText(buffer, "firstFooter");
            appendHeaderFooterText(buffer, "oddFooter");
            appendHeaderFooterText(buffer, "evenFooter");
        }

        
Append the cell contents we have collected.

/**
         * Append the cell contents we have collected.
         */
        void appendCellText(StringBuilder buffer) {
            checkMaxTextSize(buffer, output.toString());
            buffer.append(output);
        }

        
Reset this SheetTextExtractor for the next sheet.

/**
         * Reset this <code>SheetTextExtractor</code> for the next sheet.
         */
        void reset() {
            output.setLength(0);
            firstCellOfRow = true;
            if (headerFooterMap != null) {
                headerFooterMap.clear();
            }
        }
    }
}