难点在于Date日期类型的转化，需要采用
//.xls: numrec.getXFIndex() == 62//.xlsx:this.formatIndex == 31
判断日期类型，并结合DateUtil.getJavaDate进行时间解析：
//.xls: new SimpleDateFormat("yyyy年MM月dd日").format(DateUtil.getJavaDate(numrec.getValue()));//.xls: new SimpleDateFormat("yyyy年MM月dd日").format(DateUtil.getJavaDate(Double.parseDouble(n)));
.xls 转 csv
import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.IOException;import java.io.PrintStream;import java.text.SimpleDateFormat;import java.util.ArrayList;import org.apache.poi.hssf.eventusermodel.FormatTrackingHSSFListener;import org.apache.poi.hssf.eventusermodel.HSSFEventFactory;import org.apache.poi.hssf.eventusermodel.HSSFListener;import org.apache.poi.hssf.eventusermodel.HSSFRequest;import org.apache.poi.hssf.eventusermodel.MissingRecordAwareHSSFListener;import org.apache.poi.hssf.eventusermodel.EventWorkbookBuilder.SheetRecordCollectingListener;import org.apache.poi.hssf.eventusermodel.dummyrecord.LastCellOfRowDummyRecord;import org.apache.poi.hssf.eventusermodel.dummyrecord.MissingCellDummyRecord;import org.apache.poi.hssf.model.HSSFFormulaParser;import org.apache.poi.hssf.record.BOFRecord;import org.apache.poi.hssf.record.BlankRecord;import org.apache.poi.hssf.record.BoolErrRecord;import org.apache.poi.hssf.record.BoundSheetRecord;import org.apache.poi.hssf.record.FormulaRecord;import org.apache.poi.hssf.record.LabelRecord;import org.apache.poi.hssf.record.LabelSSTRecord;import org.apache.poi.hssf.record.NoteRecord;import org.apache.poi.hssf.record.NumberRecord;import org.apache.poi.hssf.record.RKRecord;import org.apache.poi.hssf.record.Record;import org.apache.poi.hssf.record.SSTRecord;import org.apache.poi.hssf.record.StringRecord;import org.apache.poi.hssf.usermodel.HSSFWorkbook;import org.apache.poi.poifs.filesystem.POIFSFileSystem;import org.apache.poi.ss.usermodel.DateUtil;public class XLS2CSV implements HSSFListener{private int minColumns;private POIFSFileSystem fs;private PrintStream output;private int lastRowNumber;private int lastColumnNumber;/** Should we output the formula, or the value it has? */private boolean outputFormulaValues = true;/** For parsing Formulas */private SheetRecordCollectingListener workbookBuildingListener;private HSSFWorkbook stubWorkbook;// Records we pick up as we processprivate SSTRecord sstRecord;private FormatTrackingHSSFListener formatListener;/** So we known which sheet we're on */private int sheetIndex = -1;private BoundSheetRecord[] orderedBSRs;private ArrayList boundSheetRecords = new ArrayList();// For handling formulas with string resultsprivate int nextRow;private int nextColumn;private boolean outputNextStringRecord;private final String OUTPUT_CHARSET = "GBK";private final SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy年MM月dd日");/*** Creates a new XLS -> CSV converter** @param fs* The POIFSFileSystem 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 XLS2CSV(POIFSFileSystem fs, PrintStream output, int minColumns) {this.fs = fs;this.output = output;this.minColumns = minColumns;}public XLS2CSV(String inputFilePath, String outputFilePath) throws Exception {fs = new POIFSFileSystem(new FileInputStream(inputFilePath));output = new PrintStream(outputFilePath, OUTPUT_CHARSET);minColumns = -1;}/*** Creates a new XLS -> CSV converter** @param filename* The file to process* @param minColumns* The minimum number of columns to output, or -1 for no minimum* @throws IOException* @throws FileNotFoundException*/public XLS2CSV(String filename, int minColumns) throws IOException,FileNotFoundException {this(new POIFSFileSystem(new FileInputStream(filename)), System.out,minColumns);}/*** Initiates the processing of the XLS file to CSV*/public void process() throws IOException {MissingRecordAwareHSSFListener listener = new MissingRecordAwareHSSFListener(this);formatListener = new FormatTrackingHSSFListener(listener);HSSFEventFactory factory = new HSSFEventFactory();HSSFRequest request = new HSSFRequest();if (outputFormulaValues) {request.addListenerForAllRecords(formatListener);} else {workbookBuildingListener = new SheetRecordCollectingListener(formatListener);request.addListenerForAllRecords(workbookBuildingListener);}factory.processWorkbookEvents(request, fs);}/*** Main HSSFListener method, processes events, and outputs the CSV as the* file is processed.*/public void processRecord(Record record) {int thisRow = -1;int thisColumn = -1;String thisStr = null;//System.out.println(record.getSid());switch (record.getSid()) {case BoundSheetRecord.sid://boundSheetRecords.add(record);break;case BOFRecord.sid:BOFRecord br = (BOFRecord) record;if (br.getType() == BOFRecord.TYPE_WORKSHEET) {// Create sub workbook if requiredif (workbookBuildingListener != null && stubWorkbook == null) {stubWorkbook = workbookBuildingListener.getStubHSSFWorkbook();}// Output the worksheet name// Works by ordering the BSRs by the location of// their BOFRecords, and then knowing that we// process BOFRecords in byte offset ordersheetIndex++;if (orderedBSRs == null) {orderedBSRs = BoundSheetRecord.orderByBofPosition(boundSheetRecords);}//output.println();//不需要分页//output.println(orderedBSRs[sheetIndex].getSheetname() + " ["//+ (sheetIndex + 1) + "]:");}break;case SSTRecord.sid:sstRecord = (SSTRecord) record;break;case BlankRecord.sid:BlankRecord brec = (BlankRecord) record;thisRow = brec.getRow();thisColumn = brec.getColumn();thisStr = "";break;case BoolErrRecord.sid:BoolErrRecord berec = (BoolErrRecord) record;thisRow = berec.getRow();thisColumn = berec.getColumn();thisStr = "";break;case FormulaRecord.sid:FormulaRecord frec = (FormulaRecord) record;thisRow = frec.getRow();thisColumn = frec.getColumn();if (outputFormulaValues) {if (Double.isNaN(frec.getValue())) {// Formula result is a string// This is stored in the next recordoutputNextStringRecord = true;nextRow = frec.getRow();nextColumn = frec.getColumn();} else {thisStr = formatListener.formatNumberDateCell(frec);}} else {thisStr = '"' + HSSFFormulaParser.toFormulaString(stubWorkbook,frec.getParsedExpression()) + '"';}break;case StringRecord.sid:if (outputNextStringRecord) {// String for formulaStringRecord srec = (StringRecord) record;thisStr = srec.getString();thisRow = nextRow;thisColumn = nextColumn;outputNextStringRecord = false;}break;case LabelRecord.sid:LabelRecord lrec = (LabelRecord) record;thisRow = lrec.getRow();thisColumn = lrec.getColumn();thisStr = '"' + lrec.getValue() + '"';break;case LabelSSTRecord.sid:LabelSSTRecord lsrec = (LabelSSTRecord) record;thisRow = lsrec.getRow();thisColumn = lsrec.getColumn();if (sstRecord == null) {thisStr = '"' + "(No SST Record, can't identify string)" + '"';} else {thisStr = '"' + sstRecord.getString(lsrec.getSSTIndex()).toString() + '"';}break;case NoteRecord.sid:NoteRecord nrec = (NoteRecord) record;thisRow = nrec.getRow();thisColumn = nrec.getColumn();// TODO: Find object to match nrec.getShapeId()thisStr = '"' + "(TODO)" + '"';break;case NumberRecord.sid:NumberRecord numrec = (NumberRecord) record;thisRow = numrec.getRow();thisColumn = numrec.getColumn();//if (DateUtil.isInternalDateFormat(numrec.getXFIndex())) {if (numrec.getXFIndex() == 62) {thisStr = dateFormat.format(DateUtil.getJavaDate(numrec.getValue()));}else{thisStr = formatListener.formatNumberDateCell(numrec);}//System.out.println("thisStr: "+thisStr);break;case RKRecord.sid:RKRecord rkrec = (RKRecord) record;thisRow = rkrec.getRow();thisColumn = rkrec.getColumn();thisStr = '"' + "(TODO)" + '"';break;default:break;}// Handle new rowif (thisRow != -1 && thisRow != lastRowNumber) {lastColumnNumber = -1;}// Handle missing columnif (record instanceof MissingCellDummyRecord) {MissingCellDummyRecord mc = (MissingCellDummyRecord) record;thisRow = mc.getRow();thisColumn = mc.getColumn();thisStr = "";}// If we got something to print out, do soif (thisStr != null) {if (thisColumn > 0) {output.print(',');}output.print(thisStr);}// Update column and row countif (thisRow > -1)lastRowNumber = thisRow;if (thisColumn > -1)lastColumnNumber = thisColumn;// Handle end of rowif (record instanceof LastCellOfRowDummyRecord) {// Print out any missing commas if neededif (minColumns > 0) {// Columns are 0 basedif (lastColumnNumber == -1) {lastColumnNumber = 0;}for (int i = lastColumnNumber; i < (minColumns); i++) {output.print(',');}}// We're onto a new rowlastColumnNumber = -1;// End the rowoutput.println();}}public static void main(String[] args) throws Exception {XLS2CSV xls2csv = new XLS2CSV("D:\\a.xls","D:\\a.csv");xls2csv.process();}}
.xlsx 转 csv
import java.io.IOException;import java.io.InputStream;import java.io.PrintStream;import java.text.SimpleDateFormat;import javax.xml.parsers.ParserConfigurationException;import javax.xml.parsers.SAXParser;import javax.xml.parsers.SAXParserFactory;import org.apache.poi.openxml4j.exceptions.OpenXML4JException;import org.apache.poi.openxml4j.opc.OPCPackage;import org.apache.poi.openxml4j.opc.PackageAccess;import org.apache.poi.ss.usermodel.BuiltinFormats;import org.apache.poi.ss.usermodel.DataFormatter;import org.apache.poi.ss.usermodel.DateUtil;import org.apache.poi.xssf.eventusermodel.ReadOnlySharedStringsTable;import org.apache.poi.xssf.eventusermodel.XSSFReader;import org.apache.poi.xssf.model.StylesTable;import org.apache.poi.xssf.usermodel.XSSFCellStyle;import org.apache.poi.xssf.usermodel.XSSFRichTextString;import org.xml.sax.Attributes;import org.xml.sax.ContentHandler;import org.xml.sax.InputSource;import org.xml.sax.SAXException;import org.xml.sax.XMLReader;import org.xml.sax.helpers.DefaultHandler;public class XLSX2CSV {/*** The type of the data value is indicated by an attribute on the cell. The* value is usually in a "v" element within the cell.*/enum xssfDataType {BOOL, ERROR, FORMULA, INLINESTR, SSTINDEX, NUMBER,}/*** Derived from /spreadsheet/how-to.html#xssf_sax_api* <p/>* Also see Standard ECMA-376, 1st edition, part 4, pages 1928ff, at* http://www.ecma-/publications/standards/Ecma-376.htm* <p/>* A web-friendly version is /Ecma/376/Part4*/class MyXSSFSheetHandler extends DefaultHandler {private final SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy年MM月dd日");/*** Table with styles*/private StylesTable stylesTable;/*** Table with unique strings*/private ReadOnlySharedStringsTable sharedStringsTable;/*** Destination for data*/private final PrintStream output;/*** Number of columns to read starting with leftmost*/private final int minColumnCount;// Set when V start element is seenprivate boolean vIsOpen;// Set when cell start element is seen;// used when cell close element is seen.private xssfDataType nextDataType;// Used to format numeric cell values.private short formatIndex;private String formatString;private final DataFormatter formatter;private int thisColumn = -1;// The last column printed to the output streamprivate int lastColumnNumber = -1;// Gathers characters as they are seen.private StringBuffer value;/*** Accepts objects needed while parsing.** @param styles* Table of styles* @param strings* Table of shared strings* @param cols* Minimum number of columns to show* @param target* Sink for output*/public MyXSSFSheetHandler(StylesTable styles,ReadOnlySharedStringsTable strings, int cols, PrintStream target) {this.stylesTable = styles;this.sharedStringsTable = strings;this.minColumnCount = cols;this.output = target;this.value = new StringBuffer();this.nextDataType = xssfDataType.NUMBER;this.formatter = new DataFormatter();}/** (non-Javadoc)** @see* org.xml.sax.helpers.DefaultHandler#startElement(java.lang.String,* java.lang.String, java.lang.String, org.xml.sax.Attributes)*/public void startElement(String uri, String localName, String name,Attributes attributes) throws SAXException {if ("inlineStr".equals(name) || "v".equals(name)) {vIsOpen = true;// Clear contents cachevalue.setLength(0);}// c => cellelse if ("c".equals(name)) {// Get the cell referenceString r = attributes.getValue("r");int firstDigit = -1;for (int c = 0; c < r.length(); ++c) {if (Character.isDigit(r.charAt(c))) {firstDigit = c;break;}}thisColumn = nameToColumn(r.substring(0, firstDigit));// Set up defaults.this.nextDataType = xssfDataType.NUMBER;this.formatIndex = -1;this.formatString = null;String cellType = attributes.getValue("t");String cellStyleStr = attributes.getValue("s");if ("b".equals(cellType))nextDataType = xssfDataType.BOOL;else if ("e".equals(cellType))nextDataType = xssfDataType.ERROR;else if ("inlineStr".equals(cellType))nextDataType = xssfDataType.INLINESTR;else if ("s".equals(cellType))nextDataType = xssfDataType.SSTINDEX;else if ("str".equals(cellType))nextDataType = xssfDataType.FORMULA;else if (cellStyleStr != null) {// It's a number, but almost certainly one// with a special style or formatint styleIndex = Integer.parseInt(cellStyleStr);XSSFCellStyle style = stylesTable.getStyleAt(styleIndex);this.formatIndex = style.getDataFormat();this.formatString = style.getDataFormatString();if (this.formatString == null)this.formatString = BuiltinFormats.getBuiltinFormat(this.formatIndex);}}}/** (non-Javadoc)** @see org.xml.sax.helpers.DefaultHandler#endElement(java.lang.String,* java.lang.String, java.lang.String)*/public void endElement(String uri, String localName, String name)throws SAXException {String thisStr = null;// v => contents of a cellif ("v".equals(name)) {// Process the value contents as required.// Do now, as characters() may be called more than onceswitch (nextDataType) {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)if(this.formatIndex == 31){thisStr = dateFormat.format(DateUtil.getJavaDate(Double.parseDouble(n)));}else{thisStr = formatter.formatRawCellContents(Double.parseDouble(n), this.formatIndex,this.formatString);}elsethisStr = n;//System.out.println("thisStr: "+thisStr);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 rowif (lastColumnNumber == -1) {lastColumnNumber = 0;}for (int i = lastColumnNumber; i < thisColumn; ++i)output.print(',');// Might be the empty string.output.print(thisStr);// Update columnif (thisColumn > -1)lastColumnNumber = thisColumn;} else if ("row".equals(name)) {// Print out any missing commas if neededif (minColumns > 0) {// Columns are 0 basedif (lastColumnNumber == -1) {lastColumnNumber = 0;}for (int i = lastColumnNumber; i < (this.minColumnCount); i++) {output.print(',');}}// We're onto a new rowoutput.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;private final String OUTPUT_CHARSET = "GBK";/*** 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;}//TODO catch exceptionspublic XLSX2CSV(String inputFilePath, String outputFilePath) throws Exception {xlsxPackage = OPCPackage.open(inputFilePath, PackageAccess.READ);output = new PrintStream(outputFilePath, OUTPUT_CHARSET);minColumns = -1;}/*** 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();//不要分页//this.output.println();//this.output.println(sheetName + " [index=" + index + "]:");processSheet(styles, strings, stream);stream.close();++index;}close();}public void close(){this.output.close();}public static void main(String[] args) throws Exception {XLSX2CSV xlsx2csv = new XLSX2CSV("D:\\b.xlsx", "D:\\b.csv");xlsx2csv.process();}}
