Update the XSSF EventModel example, to show how to do it better using the SheetContentsHandler helper that does most of the work for you
git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1707326 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Nick Burch
parent
75467f7cdb
commit
4ae623c699
@ -23,32 +23,28 @@ import java.io.InputStream;
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import java.io.PrintStream;
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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.ss.usermodel.BuiltinFormats;
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import org.apache.poi.ss.usermodel.DataFormatter;
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import org.apache.poi.ss.util.CellReference;
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import org.apache.poi.util.SAXHelper;
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import org.apache.poi.xssf.eventusermodel.XSSFSheetXMLHandler.SheetContentsHandler;
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import org.apache.poi.xssf.extractor.XSSFEventBasedExcelExtractor;
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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.xml.sax.Attributes;
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import org.apache.poi.xssf.usermodel.XSSFComment;
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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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* POI sample program XLS2CSVmra from the package
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* org.apache.poi.hssf.eventusermodel.examples.
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* As with the HSSF version, this tries to spot missing
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* rows and cells, and output empty entries for them.
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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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@ -61,263 +57,81 @@ import org.xml.sax.helpers.DefaultHandler;
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* <p/>
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* For a more advanced implementation of SAX event parsing
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* of XLSX files, see {@link XSSFEventBasedExcelExtractor}
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* and {@link XSSFSheetXMLHandler}. Note that some use cases,
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* and {@link XSSFSheetXMLHandler}. Note that for many cases,
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* it may be possible to simply use those with a custom
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* {@link SheetContentsHandler} and no SAX code needed of
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* your own!
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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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* Uses the XSSF Event SAX helpers to do most of the work
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* of parsing the Sheet XML, and outputs the contents
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* as a (basic) CSV.
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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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private class SheetToCSV implements SheetContentsHandler {
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private boolean firstCellOfRow = false;
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private int currentRow = -1;
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private int currentCol = -1;
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private void outputMissingRows(int number) {
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for (int i=0; i<number; i++) {
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for (int j=0; j<minColumns; j++) {
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output.append(',');
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}
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output.append('\n');
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}
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}
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public void startRow(int rowNum) {
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// If there were gaps, output the missing rows
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outputMissingRows(rowNum-currentRow-1);
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// Prepare for this row
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firstCellOfRow = true;
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currentRow = rowNum;
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currentCol = -1;
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}
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public void endRow(int rowNum) {
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// Ensure the minimum number of columns
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for (int i=currentCol; i<minColumns; i++) {
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output.append(',');
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}
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output.append('\n');
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}
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public void cell(String cellReference, String formattedValue,
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XSSFComment comment) {
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if (firstCellOfRow) {
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firstCellOfRow = false;
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} else {
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output.append(',');
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}
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// Did we miss any cells?
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int thisCol = (new CellReference(cellReference)).getCol();
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int missedCols = thisCol - currentCol - 1;
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for (int i=0; i<missedCols; i++) {
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output.append(',');
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}
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currentCol = thisCol;
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// Number or string?
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try {
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Double.parseDouble(formattedValue);
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output.append(formattedValue);
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} catch (NumberFormatException e) {
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output.append('"');
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output.append(formattedValue);
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output.append('"');
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}
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}
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public void headerFooter(String text, boolean isHeader, String tagName) {
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// Skip, no headers or footers in CSV
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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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// 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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this.stylesTable = styles;
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this.sharedStringsTable = strings;
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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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// It's a number, but almost certainly one
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// with a special style or format
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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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* (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 && n.length() > 0)
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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
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if (lastColumnNumber == -1) {
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lastColumnNumber = 0;
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}
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for (int i = lastColumnNumber; i < thisColumn; ++i)
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output.print(',');
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// Might be the empty string.
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output.print(thisStr);
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// Update column
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if (thisColumn > -1)
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lastColumnNumber = thisColumn;
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} else if ("row".equals(name)) {
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// Print out any missing commas if needed
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if (minColumns > 0) {
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// Columns are 0 based
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if (lastColumnNumber == -1) {
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lastColumnNumber = 0;
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}
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for (int i = lastColumnNumber; i < minColumns; i++) {
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output.print(',');
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}
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}
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// We're onto a new row
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output.println();
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lastColumnNumber = -1;
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}
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}
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/**
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* Captures characters only if a suitable element is open.
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* Originally was just "v"; extended for inlineStr also.
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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 (vIsOpen)
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value.append(ch, start, length);
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}
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/**
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* Converts an Excel column name like "C" to a zero-based index.
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*
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* @param name
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* @return Index corresponding to the specified name
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*/
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private int nameToColumn(String name) {
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int column = -1;
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for (int i = 0; i < name.length(); ++i) {
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int c = name.charAt(i);
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column = (column + 1) * 26 + c - 'A';
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}
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return column;
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}
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}
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///////////////////////////////////////
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private final OPCPackage xlsxPackage;
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@ -356,16 +170,20 @@ public class XLSX2CSV {
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public void processSheet(
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StylesTable styles,
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ReadOnlySharedStringsTable strings,
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SheetContentsHandler sheetHandler,
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InputStream sheetInputStream)
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throws IOException, ParserConfigurationException, SAXException {
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DataFormatter formatter = new DataFormatter();
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InputSource sheetSource = new InputSource(sheetInputStream);
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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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ContentHandler handler = new MyXSSFSheetHandler(styles, strings);
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sheetParser.setContentHandler(handler);
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sheetParser.parse(sheetSource);
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try {
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XMLReader sheetParser = SAXHelper.newXMLReader();
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ContentHandler handler = new XSSFSheetXMLHandler(
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styles, null, strings, sheetHandler, formatter, false);
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sheetParser.setContentHandler(handler);
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sheetParser.parse(sheetSource);
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} catch(ParserConfigurationException e) {
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throw new RuntimeException("SAX parser appears to be broken - " + e.getMessage());
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}
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}
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/**
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@ -378,7 +196,6 @@ public class XLSX2CSV {
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*/
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public void process()
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throws IOException, OpenXML4JException, ParserConfigurationException, SAXException {
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ReadOnlySharedStringsTable strings = new ReadOnlySharedStringsTable(this.xlsxPackage);
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XSSFReader xssfReader = new XSSFReader(this.xlsxPackage);
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StylesTable styles = xssfReader.getStylesTable();
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@ -389,7 +206,7 @@ public class XLSX2CSV {
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String sheetName = iter.getSheetName();
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this.output.println();
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this.output.println(sheetName + " [index=" + index + "]:");
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processSheet(styles, strings, stream);
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processSheet(styles, strings, new SheetToCSV(), stream);
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stream.close();
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++index;
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}
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@ -418,5 +235,4 @@ public class XLSX2CSV {
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xlsx2csv.process();
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p.close();
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}
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}
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@ -19,6 +19,7 @@ package org.apache.poi.xssf.eventusermodel.examples;
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import java.io.InputStream;
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import java.util.Iterator;
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import org.apache.poi.xssf.eventusermodel.XLSX2CSV;
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import org.apache.poi.xssf.eventusermodel.XSSFReader;
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import org.apache.poi.xssf.model.SharedStringsTable;
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import org.apache.poi.xssf.usermodel.XSSFRichTextString;
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@ -32,18 +33,21 @@ import org.xml.sax.helpers.DefaultHandler;
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import org.xml.sax.helpers.XMLReaderFactory;
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/**
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* XSSF and SAX (Event API)
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* XSSF and SAX (Event API) basic example.
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* See {@link XLSX2CSV} for a fuller example of doing
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* XSLX processing with the XSSF Event code.
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*/
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public class FromHowTo {
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public void processOneSheet(String filename) throws Exception {
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public void processFirstSheet(String filename) throws Exception {
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OPCPackage pkg = OPCPackage.open(filename);
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XSSFReader r = new XSSFReader( pkg );
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SharedStringsTable sst = r.getSharedStringsTable();
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XMLReader parser = fetchSheetParser(sst);
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// rId2 found by processing the Workbook
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// Seems to either be rId# or rSheet#
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// To look up the Sheet Name / Sheet Order / rID,
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// you need to process the core Workbook stream.
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// Normally it's of the form rId# or rSheet#
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InputStream sheet2 = r.getSheet("rId2");
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InputSource sheetSource = new InputSource(sheet2);
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parser.parse(sheetSource);
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@ -133,7 +137,7 @@ public class FromHowTo {
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public static void main(String[] args) throws Exception {
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FromHowTo howto = new FromHowTo();
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howto.processOneSheet(args[0]);
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howto.processFirstSheet(args[0]);
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howto.processAllSheets(args[0]);
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}
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}
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Reference in New Issue
Block a user