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/* ==================================================================== |
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Licensed to the Apache Software Foundation (ASF) under one or more |
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contributor license agreements. See the NOTICE file distributed with |
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this work for additional information regarding copyright ownership. |
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The ASF licenses this file to You under the Apache License, Version 2.0 |
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(the "License"); you may not use this file except in compliance with |
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the License. You may obtain a copy of the License at |
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http://www.apache.org/licenses/LICENSE-2.0 |
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Unless required by applicable law or agreed to in writing, software |
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distributed under the License is distributed on an "AS IS" BASIS, |
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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See the License for the specific language governing permissions and |
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limitations under the License. |
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==================================================================== */ |
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package org.apache.poi.xssf.eventusermodel; |
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import java.io.File; |
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import java.io.IOException; |
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import java.io.InputStream; |
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import java.io.PrintStream; |
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import java.util.ArrayList; |
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import javax.xml.parsers.ParserConfigurationException; |
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import javax.xml.parsers.SAXParser; |
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import javax.xml.parsers.SAXParserFactory; |
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import org.apache.poi.openxml4j.exceptions.OpenXML4JException; |
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import org.apache.poi.openxml4j.opc.OPCPackage; |
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import org.apache.poi.openxml4j.opc.PackageAccess; |
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import org.apache.poi.openxml4j.opc.PackagePart; |
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import org.apache.poi.openxml4j.opc.PackageRelationship; |
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import org.apache.poi.ss.usermodel.BuiltinFormats; |
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import org.apache.poi.ss.usermodel.DataFormatter; |
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import org.apache.poi.xssf.model.StylesTable; |
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import org.apache.poi.xssf.usermodel.XSSFCellStyle; |
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import org.apache.poi.xssf.usermodel.XSSFRichTextString; |
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import org.apache.poi.xssf.usermodel.XSSFRelation; |
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import org.xml.sax.Attributes; |
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import org.xml.sax.ContentHandler; |
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import org.xml.sax.InputSource; |
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import org.xml.sax.SAXException; |
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import org.xml.sax.XMLReader; |
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import org.xml.sax.helpers.DefaultHandler; |
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/** |
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* A rudimentary XLSX -> CSV processor modeled on the |
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* POI sample program XLS2CSVmra by Nick Burch from the |
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* package org.apache.poi.hssf.eventusermodel.examples. |
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* Unlike the HSSF version, this one completely ignores |
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* missing rows. |
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* <p/> |
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* Data sheets are read using a SAX parser to keep the |
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* memory footprint relatively small, so this should be |
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* able to read enormous workbooks. The styles table and |
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* the shared-string table must be kept in memory. The |
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* standard POI styles table class is used, but a custom |
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* (read-only) class is used for the shared string table |
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* because the standard POI SharedStringsTable grows very |
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* quickly with the number of unique strings. |
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* |
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* @author Chris Lott |
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*/ |
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public class XLSX2CSV { |
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/** |
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* The type of the data value is indicated by an attribute on the cell. |
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* The value is usually in a "v" element within the cell. |
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*/ |
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enum xssfDataType { |
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BOOL, |
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ERROR, |
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FORMULA, |
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INLINESTR, |
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SSTINDEX, |
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NUMBER, |
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} |
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static class ReadonlySharedStringsTable extends DefaultHandler { |
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/** |
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* An integer representing the total count of strings in the workbook. This count does not |
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* include any numbers, it counts only the total of text strings in the workbook. |
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*/ |
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private int count; |
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/** |
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* An integer representing the total count of unique strings in the Shared String Table. |
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* A string is unique even if it is a copy of another string, but has different formatting applied |
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* at the character level. |
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*/ |
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private int uniqueCount; |
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/** |
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* The shared strings table. |
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*/ |
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private String[] strings; |
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/** |
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* @param pkg |
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* @throws IOException |
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* @throws SAXException |
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* @throws ParserConfigurationException |
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*/ |
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public ReadonlySharedStringsTable(OPCPackage pkg) |
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throws IOException, SAXException, ParserConfigurationException { |
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ArrayList<PackagePart> parts = |
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pkg.getPartsByContentType(XSSFRelation.SHARED_STRINGS.getContentType()); |
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PackagePart sstPart = parts.get(0); |
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readFrom(sstPart.getInputStream()); |
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} |
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/** |
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* Like POIXMLDocumentPart constructor |
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* |
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* @param part |
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* @param rel_ignored |
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* @throws IOException |
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*/ |
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public ReadonlySharedStringsTable(PackagePart part, PackageRelationship rel_ignored) |
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throws IOException, SAXException, ParserConfigurationException { |
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readFrom(part.getInputStream()); |
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} |
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/** |
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* Read this shared strings table from an XML file. |
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* |
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* @param is The input stream containing the XML document. |
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* @throws IOException if an error occurs while reading. |
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* @throws SAXException |
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* @throws ParserConfigurationException |
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*/ |
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public void readFrom(InputStream is) throws IOException, SAXException, ParserConfigurationException { |
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InputSource sheetSource = new InputSource(is); |
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SAXParserFactory saxFactory = SAXParserFactory.newInstance(); |
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SAXParser saxParser = saxFactory.newSAXParser(); |
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XMLReader sheetParser = saxParser.getXMLReader(); |
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sheetParser.setContentHandler(this); |
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sheetParser.parse(sheetSource); |
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} |
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/** |
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* Return an integer representing the total count of strings in the workbook. This count does not |
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* include any numbers, it counts only the total of text strings in the workbook. |
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* |
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* @return the total count of strings in the workbook |
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*/ |
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public int getCount() { |
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return this.count; |
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} |
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/** |
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* Returns an integer representing the total count of unique strings in the Shared String Table. |
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* A string is unique even if it is a copy of another string, but has different formatting applied |
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* at the character level. |
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* |
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* @return the total count of unique strings in the workbook |
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*/ |
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public int getUniqueCount() { |
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return this.uniqueCount; |
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} |
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/** |
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* Return a string item by index |
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* |
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* @param idx index of item to return. |
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* @return the item at the specified position in this Shared String table. |
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*/ |
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public String getEntryAt(int idx) { |
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return strings[idx]; |
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} |
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//// ContentHandler methods //// |
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private StringBuffer characters; |
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private boolean tIsOpen; |
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private int index; |
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/* |
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* (non-Javadoc) |
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* @see org.xml.sax.helpers.DefaultHandler#startElement(java.lang.String, java.lang.String, java.lang.String, org.xml.sax.Attributes) |
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*/ |
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public void startElement(String uri, String localName, String name, |
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Attributes attributes) throws SAXException { |
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if ("sst".equals(name)) { |
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String count = attributes.getValue("count"); |
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String uniqueCount = attributes.getValue("uniqueCount"); |
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this.count = Integer.parseInt(count); |
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this.uniqueCount = Integer.parseInt(uniqueCount); |
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this.strings = new String[this.uniqueCount]; |
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index = 0; |
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characters = new StringBuffer(); |
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} else if ("t".equals(name)) { |
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characters.setLength(0); |
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tIsOpen = true; |
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} |
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} |
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/* |
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* (non-Javadoc) |
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* @see org.xml.sax.helpers.DefaultHandler#endElement(java.lang.String, java.lang.String, java.lang.String) |
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*/ |
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public void endElement(String uri, String localName, String name) |
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throws SAXException { |
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if ("t".equals(name)) { |
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strings[index] = characters.toString(); |
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++index; |
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} |
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} |
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/** |
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* Captures characters only if a t(ext?) element is open. |
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*/ |
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public void characters(char[] ch, int start, int length) |
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throws SAXException { |
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if (tIsOpen) |
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characters.append(ch, start, length); |
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} |
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} |
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/** |
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* Derived from http://poi.apache.org/spreadsheet/how-to.html#xssf_sax_api |
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* <p/> |
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* Also see Standard ECMA-376, 1st edition, part 4, pages 1928ff, at |
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* http://www.ecma-international.org/publications/standards/Ecma-376.htm |
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* <p/> |
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* A web-friendly version is http://openiso.org/Ecma/376/Part4 |
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*/ |
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class MyXSSFSheetHandler extends DefaultHandler { |
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/** |
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* Table with styles |
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*/ |
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private StylesTable stylesTable; |
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/** |
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* Table with unique strings |
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*/ |
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private ReadonlySharedStringsTable sharedStringsTable; |
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/** |
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* Destination for data |
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*/ |
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private final PrintStream output; |
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/** |
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* Number of columns to read starting with leftmost |
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*/ |
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private final int minColumnCount; |
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// Set when V start element is seen |
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private boolean vIsOpen; |
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// Set when cell start element is seen; |
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// used when cell close element is seen. |
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private xssfDataType nextDataType; |
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// Used to format numeric cell values. |
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private short formatIndex; |
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private String formatString; |
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private final DataFormatter formatter; |
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private int thisColumn = -1; |
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// The last column printed to the output stream |
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private int lastColumnNumber = -1; |
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// Gathers characters as they are seen. |
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private StringBuffer value; |
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/** |
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* Accepts objects needed while parsing. |
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* |
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* @param styles Table of styles |
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* @param strings Table of shared strings |
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* @param cols Minimum number of columns to show |
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* @param target Sink for output |
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*/ |
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public MyXSSFSheetHandler( |
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StylesTable styles, |
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ReadonlySharedStringsTable strings, |
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int cols, |
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PrintStream target) { |
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this.stylesTable = styles; |
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this.sharedStringsTable = strings; |
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this.minColumnCount = cols; |
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this.output = target; |
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this.value = new StringBuffer(); |
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this.nextDataType = xssfDataType.NUMBER; |
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this.formatter = new DataFormatter(); |
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} |
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/* |
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* (non-Javadoc) |
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* @see org.xml.sax.helpers.DefaultHandler#startElement(java.lang.String, java.lang.String, java.lang.String, org.xml.sax.Attributes) |
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*/ |
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public void startElement(String uri, String localName, String name, |
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Attributes attributes) throws SAXException { |
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if ("inlineStr".equals(name) || "v".equals(name)) { |
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vIsOpen = true; |
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// Clear contents cache |
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value.setLength(0); |
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} |
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// c => cell |
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else if ("c".equals(name)) { |
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// Get the cell reference |
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String r = attributes.getValue("r"); |
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int firstDigit = -1; |
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for (int c = 0; c < r.length(); ++c) { |
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if (Character.isDigit(r.charAt(c))) { |
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firstDigit = c; |
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break; |
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} |
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} |
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thisColumn = nameToColumn(r.substring(0, firstDigit)); |
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// Set up defaults. |
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this.nextDataType = xssfDataType.NUMBER; |
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this.formatIndex = -1; |
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this.formatString = null; |
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String cellType = attributes.getValue("t"); |
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String cellStyleStr = attributes.getValue("s"); |
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if ("b".equals(cellType)) |
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nextDataType = xssfDataType.BOOL; |
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else if ("e".equals(cellType)) |
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nextDataType = xssfDataType.ERROR; |
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else if ("inlineStr".equals(cellType)) |
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nextDataType = xssfDataType.INLINESTR; |
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else if ("s".equals(cellType)) |
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nextDataType = xssfDataType.SSTINDEX; |
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else if ("str".equals(cellType)) |
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nextDataType = xssfDataType.FORMULA; |
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else if (cellStyleStr != null) { |
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/* |
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* It's a number, but possibly has a style and/or special format. |
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* Nick Burch said to use org.apache.poi.ss.usermodel.BuiltinFormats, |
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* and I see javadoc for that at apache.org, but it's not in the |
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* POI 3.5 Beta 5 jars. Scheduled to appear in 3.5 beta 6. |
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*/ |
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int styleIndex = Integer.parseInt(cellStyleStr); |
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XSSFCellStyle style = stylesTable.getStyleAt(styleIndex); |
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this.formatIndex = style.getDataFormat(); |
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this.formatString = style.getDataFormatString(); |
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if (this.formatString == null) |
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this.formatString = BuiltinFormats.getBuiltinFormat(this.formatIndex); |
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} |
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} |
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} |
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/* |
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* (non-Javadoc) |
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* @see org.xml.sax.helpers.DefaultHandler#endElement(java.lang.String, java.lang.String, java.lang.String) |
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*/ |
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public void endElement(String uri, String localName, String name) |
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throws SAXException { |
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String thisStr = null; |
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// v => contents of a cell |
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if ("v".equals(name)) { |
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// Process the value contents as required. |
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// Do now, as characters() may be called more than once |
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switch (nextDataType) { |
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case BOOL: |
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char first = value.charAt(0); |
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thisStr = first == '0' ? "FALSE" : "TRUE"; |
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break; |
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case ERROR: |
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thisStr = "\"ERROR:" + value.toString() + '"'; |
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break; |
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case FORMULA: |
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// A formula could result in a string value, |
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// so always add double-quote characters. |
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thisStr = '"' + value.toString() + '"'; |
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break; |
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case INLINESTR: |
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// TODO: have seen an example of this, so it's untested. |
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XSSFRichTextString rtsi = new XSSFRichTextString(value.toString()); |
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thisStr = '"' + rtsi.toString() + '"'; |
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break; |
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case SSTINDEX: |
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String sstIndex = value.toString(); |
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try { |
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int idx = Integer.parseInt(sstIndex); |
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XSSFRichTextString rtss = new XSSFRichTextString(sharedStringsTable.getEntryAt(idx)); |
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thisStr = '"' + rtss.toString() + '"'; |
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} |
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catch (NumberFormatException ex) { |
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output.println("Failed to parse SST index '" + sstIndex + "': " + ex.toString()); |
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} |
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break; |
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case NUMBER: |
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String n = value.toString(); |
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if (this.formatString != null) |
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thisStr = formatter.formatRawCellContents(Double.parseDouble(n), this.formatIndex, this.formatString); |
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else |
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thisStr = n; |
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break; |
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default: |
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thisStr = "(TODO: Unexpected type: " + nextDataType + ")"; |
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break; |
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} |
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// Output after we've seen the string contents |
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|
// Emit commas for any fields that were missing on this row |
|
|
|
if (lastColumnNumber == -1) { |
|
|
|
lastColumnNumber = 0; |
|
|
|
} |
|
|
|
for (int i = lastColumnNumber; i < thisColumn; ++i) |
|
|
|
output.print(','); |
|
|
|
|
|
|
|
// Might be the empty string. |
|
|
|
output.print(thisStr); |
|
|
|
|
|
|
|
// Update column |
|
|
|
if (thisColumn > -1) |
|
|
|
lastColumnNumber = thisColumn; |
|
|
|
|
|
|
|
} else if ("row".equals(name)) { |
|
|
|
|
|
|
|
// Print out any missing commas if needed |
|
|
|
if (minColumns > 0) { |
|
|
|
// Columns are 0 based |
|
|
|
if (lastColumnNumber == -1) { |
|
|
|
lastColumnNumber = 0; |
|
|
|
} |
|
|
|
for (int i = lastColumnNumber; i < (this.minColumnCount); i++) { |
|
|
|
output.print(','); |
|
|
|
} |
|
|
|
} |
|
|
|
|
|
|
|
// We're onto a new row |
|
|
|
output.println(); |
|
|
|
lastColumnNumber = -1; |
|
|
|
} |
|
|
|
|
|
|
|
} |
|
|
|
|
|
|
|
/** |
|
|
|
* Captures characters only if a suitable element is open. |
|
|
|
* Originally was just "v"; extended for inlineStr also. |
|
|
|
*/ |
|
|
|
public void characters(char[] ch, int start, int length) |
|
|
|
throws SAXException { |
|
|
|
if (vIsOpen) |
|
|
|
value.append(ch, start, length); |
|
|
|
} |
|
|
|
|
|
|
|
/** |
|
|
|
* Converts an Excel column name like "C" to a zero-based index. |
|
|
|
* |
|
|
|
* @param name |
|
|
|
* @return Index corresponding to the specified name |
|
|
|
*/ |
|
|
|
private int nameToColumn(String name) { |
|
|
|
int column = -1; |
|
|
|
for (int i = 0; i < name.length(); ++i) { |
|
|
|
int c = name.charAt(i); |
|
|
|
column = (column + 1) * 26 + c - 'A'; |
|
|
|
} |
|
|
|
return column; |
|
|
|
} |
|
|
|
|
|
|
|
} |
|
|
|
|
|
|
|
/////////////////////////////////////// |
|
|
|
|
|
|
|
private OPCPackage xlsxPackage; |
|
|
|
private int minColumns; |
|
|
|
private PrintStream output; |
|
|
|
|
|
|
|
/** |
|
|
|
* Creates a new XLSX -> CSV converter |
|
|
|
* |
|
|
|
* @param pkg The XLSX package to process |
|
|
|
* @param output The PrintStream to output the CSV to |
|
|
|
* @param minColumns The minimum number of columns to output, or -1 for no minimum |
|
|
|
*/ |
|
|
|
public XLSX2CSV(OPCPackage pkg, PrintStream output, int minColumns) { |
|
|
|
this.xlsxPackage = pkg; |
|
|
|
this.output = output; |
|
|
|
this.minColumns = minColumns; |
|
|
|
} |
|
|
|
|
|
|
|
/** |
|
|
|
* Parses and shows the content of one sheet |
|
|
|
* using the specified styles and shared-strings tables. |
|
|
|
* |
|
|
|
* @param styles |
|
|
|
* @param strings |
|
|
|
* @param sheetInputStream |
|
|
|
*/ |
|
|
|
public void processSheet( |
|
|
|
StylesTable styles, |
|
|
|
ReadonlySharedStringsTable strings, |
|
|
|
InputStream sheetInputStream) |
|
|
|
throws IOException, ParserConfigurationException, SAXException { |
|
|
|
|
|
|
|
InputSource sheetSource = new InputSource(sheetInputStream); |
|
|
|
SAXParserFactory saxFactory = SAXParserFactory.newInstance(); |
|
|
|
SAXParser saxParser = saxFactory.newSAXParser(); |
|
|
|
XMLReader sheetParser = saxParser.getXMLReader(); |
|
|
|
ContentHandler handler = new MyXSSFSheetHandler(styles, strings, this.minColumns, this.output); |
|
|
|
sheetParser.setContentHandler(handler); |
|
|
|
sheetParser.parse(sheetSource); |
|
|
|
} |
|
|
|
|
|
|
|
/** |
|
|
|
* Initiates the processing of the XLS workbook file to CSV. |
|
|
|
* |
|
|
|
* @throws IOException |
|
|
|
* @throws OpenXML4JException |
|
|
|
* @throws ParserConfigurationException |
|
|
|
* @throws SAXException |
|
|
|
*/ |
|
|
|
public void process() |
|
|
|
throws IOException, OpenXML4JException, ParserConfigurationException, SAXException { |
|
|
|
|
|
|
|
ReadonlySharedStringsTable strings = new ReadonlySharedStringsTable(this.xlsxPackage); |
|
|
|
XSSFReader xssfReader = new XSSFReader(this.xlsxPackage); |
|
|
|
StylesTable styles = xssfReader.getStylesTable(); |
|
|
|
XSSFReader.SheetIterator iter = (XSSFReader.SheetIterator) xssfReader.getSheetsData(); |
|
|
|
int index = 0; |
|
|
|
while (iter.hasNext()) { |
|
|
|
InputStream stream = iter.next(); |
|
|
|
String sheetName = iter.getSheetName(); |
|
|
|
this.output.println(); |
|
|
|
this.output.println(sheetName + " [index=" + index + "]:"); |
|
|
|
processSheet(styles, strings, stream); |
|
|
|
stream.close(); |
|
|
|
++index; |
|
|
|
} |
|
|
|
} |
|
|
|
|
|
|
|
public static void main(String[] args) throws Exception { |
|
|
|
if (args.length < 1) { |
|
|
|
System.err.println("Use:"); |
|
|
|
System.err.println(" XLSX2CSV <xlsx file> [min columns]"); |
|
|
|
return; |
|
|
|
} |
|
|
|
|
|
|
|
File xlsxFile = new File(args[0]); |
|
|
|
if (!xlsxFile.exists()) { |
|
|
|
System.err.println("Not found or not a file: " + xlsxFile.getPath()); |
|
|
|
return; |
|
|
|
} |
|
|
|
|
|
|
|
int minColumns = -1; |
|
|
|
if (args.length >= 2) |
|
|
|
minColumns = Integer.parseInt(args[1]); |
|
|
|
|
|
|
|
// The package open is instantaneous, as it should be. |
|
|
|
OPCPackage p = OPCPackage.open(xlsxFile.getPath(), PackageAccess.READ); |
|
|
|
XLSX2CSV xlsx2csv = new XLSX2CSV(p, System.out, minColumns); |
|
|
|
xlsx2csv.process(); |
|
|
|
} |
|
|
|
|
|
|
|
} |