Added an example demonstrating how to convert an XLSX workbook to CSV, see Bugzilla 47757
git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@811816 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Yegor Kozlov
parent
4841ed0d47
commit
c3b96767de
@ -33,6 +33,7 @@
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<changes>
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<changes>
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<release version="3.5-beta7" date="2009-??-??">
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<release version="3.5-beta7" date="2009-??-??">
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<action dev="POI-DEVELOPERS" type="add">47757 - Added an example demonstrating how to convert an XLSX workbook to CSV</action>
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<action dev="POI-DEVELOPERS" type="fix">44770 - Fixed PPT parser to tolerate Comment2000 containers with missing comment text</action>
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<action dev="POI-DEVELOPERS" type="fix">44770 - Fixed PPT parser to tolerate Comment2000 containers with missing comment text</action>
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<action dev="POI-DEVELOPERS" type="fix">47773 - Fix for extraction paragraphs and sections from headers/footers with XWPFWordExtractor</action>
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<action dev="POI-DEVELOPERS" type="fix">47773 - Fix for extraction paragraphs and sections from headers/footers with XWPFWordExtractor</action>
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<action dev="POI-DEVELOPERS" type="fix">47727 - Support for extraction of header / footer images in HWPF</action>
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<action dev="POI-DEVELOPERS" type="fix">47727 - Support for extraction of header / footer images in HWPF</action>
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569
src/examples/src/org/apache/poi/xssf/eventusermodel/XLSX2CSV.java
Executable file
569
src/examples/src/org/apache/poi/xssf/eventusermodel/XLSX2CSV.java
Executable file
@ -0,0 +1,569 @@
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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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||||||
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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;
|
||||||
|
|
||||||
|
// v => contents of a cell
|
||||||
|
if ("v".equals(name)) {
|
||||||
|
// Process the value contents as required.
|
||||||
|
// Do now, as characters() may be called more than once
|
||||||
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switch (nextDataType) {
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||||||
|
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||||||
|
case BOOL:
|
||||||
|
char first = value.charAt(0);
|
||||||
|
thisStr = first == '0' ? "FALSE" : "TRUE";
|
||||||
|
break;
|
||||||
|
|
||||||
|
case ERROR:
|
||||||
|
thisStr = "\"ERROR:" + value.toString() + '"';
|
||||||
|
break;
|
||||||
|
|
||||||
|
case FORMULA:
|
||||||
|
// A formula could result in a string value,
|
||||||
|
// so always add double-quote characters.
|
||||||
|
thisStr = '"' + value.toString() + '"';
|
||||||
|
break;
|
||||||
|
|
||||||
|
case INLINESTR:
|
||||||
|
// TODO: have seen an example of this, so it's untested.
|
||||||
|
XSSFRichTextString rtsi = new XSSFRichTextString(value.toString());
|
||||||
|
thisStr = '"' + rtsi.toString() + '"';
|
||||||
|
break;
|
||||||
|
|
||||||
|
case SSTINDEX:
|
||||||
|
String sstIndex = value.toString();
|
||||||
|
try {
|
||||||
|
int idx = Integer.parseInt(sstIndex);
|
||||||
|
XSSFRichTextString rtss = new XSSFRichTextString(sharedStringsTable.getEntryAt(idx));
|
||||||
|
thisStr = '"' + rtss.toString() + '"';
|
||||||
|
}
|
||||||
|
catch (NumberFormatException ex) {
|
||||||
|
output.println("Failed to parse SST index '" + sstIndex + "': " + ex.toString());
|
||||||
|
}
|
||||||
|
break;
|
||||||
|
|
||||||
|
case NUMBER:
|
||||||
|
String n = value.toString();
|
||||||
|
if (this.formatString != null)
|
||||||
|
thisStr = formatter.formatRawCellContents(Double.parseDouble(n), this.formatIndex, this.formatString);
|
||||||
|
else
|
||||||
|
thisStr = n;
|
||||||
|
break;
|
||||||
|
|
||||||
|
default:
|
||||||
|
thisStr = "(TODO: Unexpected type: " + nextDataType + ")";
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
|
||||||
|
// Output after we've seen the string contents
|
||||||
|
// 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();
|
||||||
|
}
|
||||||
|
|
||||||
|
}
|
||||||
Loading…
Reference in New Issue
Block a user