我今天发现代码里面有个这样的问题，就是POI事件解析Excel的时候，空单元格会被忽略，请问下知道的筒子，这种情况怎么处理，注意是事件读取，附代码
- Java code
package com.its.fedex.msg.util;import java.io.IOException;import java.io.InputStream;import java.util.ArrayList;import java.util.Iterator;import java.util.List;import org.apache.poi.openxml4j.exceptions.OpenXML4JException;import org.apache.poi.openxml4j.opc.OPCPackage;import org.apache.poi.ss.usermodel.BuiltinFormats;import org.apache.poi.ss.usermodel.DataFormatter;import org.apache.poi.xssf.eventusermodel.XSSFReader;import org.apache.poi.xssf.model.SharedStringsTable;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.InputSource;import org.xml.sax.SAXException;import org.xml.sax.XMLReader;import org.xml.sax.helpers.DefaultHandler;import org.xml.sax.helpers.XMLReaderFactory;import com.its.fedex.msg.exception.ExcelParseException;import com.its.fedex.msg.service.IRowHandler;public class Excel2007Reader extends DefaultHandler{ /** * 共享字符串表 */ private SharedStringsTable sst; /** * 上一次的内容 */ private String lastContents; /** * 字符串标识 */ private boolean nextIsString; /** * 工作表索引 */ private int sheetIndex = -1; /** * 行集合 */ private List<String> rowlist = new ArrayList<String>(); /** * 当前行 */ private int curRow = 0; /** * 当前列 */ private int curCol = 0; /** * T元素标识 */ private boolean isTElement; /** * Excel数据逻辑处理 */ private IRowHandler rowHandler; /** * 异常信息，如果为空则表示没有异常 */ private String exceptionMessage; /** * 单元格数据类型，默认为字符串类型 */ private CellDataType nextDataType = CellDataType.SSTINDEX; private final DataFormatter formatter = new DataFormatter(); private short formatIndex; private String formatString; /** * 单元格 */ private StylesTable stylesTable; public void setRowReader(IRowHandler rowHandler) { this.rowHandler = rowHandler; } /** * 遍历工作簿中所有的电子表格 * * @param filename * @throws IOException * @throws OpenXML4JException * @throws SAXException * @throws Exception */ public void process(String filename) throws IOException, OpenXML4JException, SAXException { OPCPackage pkg = OPCPackage.open(filename); XSSFReader xssfReader = new XSSFReader(pkg); stylesTable = xssfReader.getStylesTable(); SharedStringsTable sst = xssfReader.getSharedStringsTable(); XMLReader parser = this.fetchSheetParser(sst); Iterator<InputStream> sheets = xssfReader.getSheetsData(); while (sheets.hasNext()) { curRow = 0; sheetIndex++; InputStream sheet = sheets.next(); InputSource sheetSource = new InputSource(sheet); parser.parse(sheetSource); sheet.close(); } } public XMLReader fetchSheetParser(SharedStringsTable sst) throws SAXException { XMLReader parser = XMLReaderFactory.createXMLReader("org.apache.xerces.parsers.SAXParser"); this.sst = sst; parser.setContentHandler(this); return parser; } @Override public void startElement(String uri, String localName, String name, Attributes attributes) throws SAXException { // c => 单元格 if ("c".equals(name)) { // 设定单元格类型 this.setNextDataType(attributes); } // 当元素为t时 if ("t".equals(name)) { isTElement = true; } else { isTElement = false; } // 置空 lastContents = ""; } /** * 单元格中的数据可能的数据类型 */ enum CellDataType { BOOL, ERROR, FORMULA, INLINESTR, SSTINDEX, NUMBER, DATE, NULL } /** * 处理数据类型 * * @param attributes */ public void setNextDataType(Attributes attributes) { nextDataType = CellDataType.NUMBER; formatIndex = -1; formatString = null; String cellType = attributes.getValue("t"); String cellStyleStr = attributes.getValue("s"); if ("b".equals(cellType)) { nextDataType = CellDataType.BOOL; } else if ("e".equals(cellType)) { nextDataType = CellDataType.ERROR; } else if ("inlineStr".equals(cellType)) { nextDataType = CellDataType.INLINESTR; } else if ("s".equals(cellType)) { nextDataType = CellDataType.SSTINDEX; } else if ("str".equals(cellType)) { nextDataType = CellDataType.FORMULA; } if (cellStyleStr != null) { int styleIndex = Integer.parseInt(cellStyleStr); XSSFCellStyle style = stylesTable.getStyleAt(styleIndex); formatIndex = style.getDataFormat(); formatString = style.getDataFormatString(); if ("m/d/yy" == formatString) { nextDataType = CellDataType.DATE; formatString = "yyyy-MM-dd hh:mm:ss.SSS"; } if (formatString == null) { nextDataType = CellDataType.NULL; formatString = BuiltinFormats.getBuiltinFormat(formatIndex); } } } /** * 对解析出来的数据进行类型处理 * * @param value * 单元格的值（这时候是一串数字） * @param thisStr * 一个空字符串 * @return */ @SuppressWarnings("deprecation") public String getDataValue(String value, String thisStr) { switch (nextDataType) { // 这几个的顺序不能随便交换，交换了很可能会导致数据错误 case BOOL: char first = value.charAt(0); thisStr = first == '0' ? "FALSE" : "TRUE"; break; case ERROR: thisStr = "\"ERROR:" + value.toString() + '"'; break; case FORMULA: thisStr = '"' + value.toString() + '"'; break; case INLINESTR: XSSFRichTextString rtsi = new XSSFRichTextString(value.toString()); thisStr = rtsi.toString(); rtsi = null; break; case SSTINDEX: String sstIndex = value.toString(); try { int idx = Integer.parseInt(sstIndex); XSSFRichTextString rtss = new XSSFRichTextString(sst.getEntryAt(idx)); thisStr = rtss.toString(); rtss = null; } catch (NumberFormatException ex) { thisStr = value.toString(); } break; case NUMBER: if (formatString != null) { thisStr = formatter.formatRawCellContents(Double.parseDouble(value), formatIndex, formatString) .trim(); } else { thisStr = value; } thisStr = thisStr.replace("_", "").trim(); break; case DATE: thisStr = formatter.formatRawCellContents(Double.parseDouble(value), formatIndex, formatString); // 对日期字符串作特殊处理 thisStr = thisStr.replace(" ", "T"); break; default: thisStr = " "; break; } return thisStr; } @Override public void endElement(String uri, String localName, String name) throws SAXException { // 根据SST的索引值的到单元格的真正要存储的字符串 // 这时characters()方法可能会被调用多次 if (nextIsString) { int idx = Integer.parseInt(lastContents); lastContents = new XSSFRichTextString(sst.getEntryAt(idx)).toString(); } // t元素也包含字符串 if (isTElement) { // 将单元格内容加入rowlist中，在这之前先去掉字符串前后的空白符 String value = lastContents.trim(); rowlist.add(curCol, value); curCol++; isTElement = false; } else if ("v".equals(name)) { // v => 单元格的值，如果单元格是字符串则v标签的值为该字符串在SST中的索引 String value = this.getDataValue(lastContents.trim(), ""); rowlist.add(curCol, value); curCol++; } else { // 如果标签名称为 row ，这说明已到行尾，调用 optRows() 方法 if (name.equals("row")) { try { rowHandler.getRows(curRow, rowlist); } catch (ExcelParseException e) { exceptionMessage = e.getMessage(); } rowlist.clear(); curRow++; curCol = 0; } } } @Override public void characters(char[] ch, int start, int length) throws SAXException { // 得到单元格内容的值 lastContents += new String(ch, start, length); } /** * @return the exceptionMessage */ public String getExceptionMessage() { return exceptionMessage; }}