之前在做移动端页面的时候，发现iphone不支持预览excel文档，于是将excel转化为html元素然后查看其中的具体信息，在这里整理下文档，以便于记忆避免踩坑。
1. 引入相关的jar包文件
dom4j-1.6.1.jar
poi-3.9.jar
poi-ooxml-3.9.jar
poi-ooxml-schemas-3.9.jar
xmlbeans-2.6.0.jar
proxool-0.9.0RC3.jar
2. 编写工具类
package com.sd.sdcj.util.excel; import java.io.File; import java.io.FileInputStream; import java.io.FileWriter; import java.io.IOException; import java.io.InputStream; import java.io.Writer; import java.text.DecimalFormat; import java.text.SimpleDateFormat; import java.util.Date; import java.util.HashMap; import java.util.Map; import org.apache.poi.hssf.usermodel.HSSFCellStyle; import org.apache.poi.hssf.usermodel.HSSFDataFormat; import org.apache.poi.hssf.usermodel.HSSFDateUtil; import org.apache.poi.hssf.usermodel.HSSFFont; import org.apache.poi.hssf.usermodel.HSSFPalette; import org.apache.poi.hssf.usermodel.HSSFWorkbook; import org.apache.poi.hssf.util.HSSFColor; import org.apache.poi.ss.usermodel.Cell; import org.apache.poi.ss.usermodel.CellStyle; import org.apache.poi.ss.usermodel.Row; import org.apache.poi.ss.usermodel.Sheet; import org.apache.poi.ss.usermodel.Workbook; import org.apache.poi.ss.usermodel.WorkbookFactory; import org.apache.poi.ss.util.CellRangeAddress; import org.apache.poi.xssf.usermodel.XSSFCellStyle; import org.apache.poi.xssf.usermodel.XSSFColor; import org.apache.poi.xssf.usermodel.XSSFFont; import org.apache.poi.xssf.usermodel.XSSFWorkbook; /** * @功能描述 POI 读取 Excel 转 HTML 支持 03xls 和 07xlsx 版本 包含样式 */ public class POIReadExcelToHtml { /** * 测试 * @param args */ public static void pdf2html(String path) { //String path = "C:\Users\yugb\Desktop\tohtml.xlsx"; InputStream is = null; String htmlExcel = null; Writer wr=null; try { File sourcefile = new File(path); is = new FileInputStream(sourcefile); Workbook wb = WorkbookFactory.create(is);//此WorkbookFactory在POI-3.10版本中使用需要添加dom4j if (wb instanceof XSSFWorkbook) { XSSFWorkbook xWb = (XSSFWorkbook) wb; htmlExcel = POIReadExcelToHtml.getExcelInfo(xWb,true); }else if(wb instanceof HSSFWorkbook){ HSSFWorkbook hWb = (HSSFWorkbook) wb; htmlExcel = POIReadExcelToHtml.getExcelInfo(hWb,true); } System.out.println(htmlExcel); File file=new File(path.substring(0,path.lastIndexOf("."))+".html"); if(!file.exists()){ file.createNewFile(); } wr=new FileWriter(file); wr.write(htmlExcel); } catch (Exception e) { e.printStackTrace(); }finally{ try { if(is!=null){ is.close(); } if(wr!=null){ wr.close(); } } catch (IOException e) { e.printStackTrace(); } } } /** * 程序入口方法 * @param filePath 文件的路径 * @param isWithStyle 是否需要表格样式 包含 字体 颜色 边框 对齐方式 * @return <table>...</table> 字符串 */ public String readExcelToHtml(String filePath , boolean isWithStyle){ InputStream is = null; String htmlExcel = null; try { File sourcefile = new File(filePath); is = new FileInputStream(sourcefile); Workbook wb = WorkbookFactory.create(is); if (wb instanceof XSSFWorkbook) { XSSFWorkbook xWb = (XSSFWorkbook) wb; htmlExcel = POIReadExcelToHtml.getExcelInfo(xWb,isWithStyle); }else if(wb instanceof HSSFWorkbook){ HSSFWorkbook hWb = (HSSFWorkbook) wb; htmlExcel = POIReadExcelToHtml.getExcelInfo(hWb,isWithStyle); } } catch (Exception e) { e.printStackTrace(); }finally{ try { is.close(); } catch (IOException e) { e.printStackTrace(); } } return htmlExcel; } public static String getExcelInfo(Workbook wb,boolean isWithStyle){ StringBuffer sb = new StringBuffer(); Sheet sheet = wb.getSheetAt(0);//获取第一个Sheet的内容 int lastRowNum = sheet.getLastRowNum(); Map<String, String> map[] = getRowSpanColSpanMap(sheet); sb.append("<table style='border-collapse:collapse;' width='100%'>"); Row row = null; //兼容 Cell cell = null; //兼容 for (int rowNum = sheet.getFirstRowNum(); rowNum <= lastRowNum; rowNum++) { row = sheet.getRow(rowNum); if (row == null) { sb.append("<tr><td > </td></tr>"); continue; } sb.append("<tr>"); int lastColNum = row.getLastCellNum(); for (int colNum = 0; colNum < lastColNum; colNum++) { cell = row.getCell(colNum); if (cell == null) { //特殊情况 空白的单元格会返回null sb.append("<td> </td>"); continue; } String stringValue = getCellValue(cell); if (map[0].containsKey(rowNum + "," + colNum)) { String pointString = map[0].get(rowNum + "," + colNum); map[0].remove(rowNum + "," + colNum); int bottomeRow = Integer.valueOf(pointString.split(",")[0]); int bottomeCol = Integer.valueOf(pointString.split(",")[1]); int rowSpan = bottomeRow - rowNum + 1; int colSpan = bottomeCol - colNum + 1; sb.append("<td rowspan= '" + rowSpan + "' colspan= '"+ colSpan + "' "); } else if (map[1].containsKey(rowNum + "," + colNum)) { map[1].remove(rowNum + "," + colNum); continue; } else { sb.append("<td "); } //判断是否需要样式 if(isWithStyle){ dealExcelStyle(wb, sheet, cell, sb);//处理单元格样式 } sb.append(">"); if (stringValue == null || "".equals(stringValue.trim())) { sb.append(" "); } else { // 将ascii码为160的空格转换为html下的空格（ ） sb.append(stringValue.replace(String.valueOf((char) 160)," ")); } sb.append("</td>"); } sb.append("</tr>"); } sb.append("</table>"); return sb.toString(); } private static Map<String, String>[] getRowSpanColSpanMap(Sheet sheet) { Map<String, String> map0 = new HashMap<String, String>(); Map<String, String> map1 = new HashMap<String, String>(); int mergedNum = sheet.getNumMergedRegions(); CellRangeAddress range = null; for (int i = 0; i < mergedNum; i++) { range = sheet.getMergedRegion(i); int topRow = range.getFirstRow(); int topCol = range.getFirstColumn(); int bottomRow = range.getLastRow(); int bottomCol = range.getLastColumn(); map0.put(topRow + "," + topCol, bottomRow + "," + bottomCol); // System.out.println(topRow + "," + topCol + "," + bottomRow + "," + bottomCol); int tempRow = topRow; while (tempRow <= bottomRow) { int tempCol = topCol; while (tempCol <= bottomCol) { map1.put(tempRow + "," + tempCol, ""); tempCol++; } tempRow++; } map1.remove(topRow + "," + topCol); } Map[] map = { map0, map1 }; return map; } /** * 获取表格单元格Cell内容 * @param cell * @return */ private static String getCellValue(Cell cell) { String result = new String(); switch (cell.getCellType()) { case Cell.CELL_TYPE_NUMERIC:// 数字类型 if (HSSFDateUtil.isCellDateFormatted(cell)) {// 处理日期格式、时间格式 SimpleDateFormat sdf = null; if (cell.getCellStyle().getDataFormat() == HSSFDataFormat.getBuiltinFormat("h:mm")) { sdf = new SimpleDateFormat("HH:mm"); } else {// 日期 sdf = new SimpleDateFormat("yyyy-MM-dd"); } Date date = cell.getDateCellValue(); result = sdf.format(date); } else if (cell.getCellStyle().getDataFormat() == 58) { // 处理自定义日期格式：m月d日(通过判断单元格的格式id解决，id的值是58) SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); double value = cell.getNumericCellValue(); Date date = org.apache.poi.ss.usermodel.DateUtil .getJavaDate(value); result = sdf.format(date); } else { double value = cell.getNumericCellValue(); CellStyle style = cell.getCellStyle(); DecimalFormat format = new DecimalFormat(); String temp = style.getDataFormatString(); // 单元格设置成常规 if (temp.equals("General")) { format.applyPattern("#"); } result = format.format(value); } break; case Cell.CELL_TYPE_STRING:// String类型 result = cell.getRichStringCellValue().toString(); break; case Cell.CELL_TYPE_BLANK: result = ""; break; default: result = ""; break; } return result; } /** * 处理表格样式 * @param wb * @param sheet * @param cell * @param sb */ private static void dealExcelStyle(Workbook wb,Sheet sheet,Cell cell,StringBuffer sb){ CellStyle cellStyle = cell.getCellStyle(); if (cellStyle != null) { short alignment = cellStyle.getAlignment(); sb.append("align='" + convertAlignToHtml(alignment) + "' ");//单元格内容的水平对齐方式 short verticalAlignment = cellStyle.getVerticalAlignment(); sb.append("valign='"+ convertVerticalAlignToHtml(verticalAlignment)+ "' ");//单元格中内容的垂直排列方式 if (wb instanceof XSSFWorkbook) { XSSFFont xf = ((XSSFCellStyle) cellStyle).getFont(); short boldWeight = xf.getBoldweight(); sb.append("style='"); sb.append("font-weight:" + boldWeight + ";"); // 字体加粗 sb.append("font-size: " + xf.getFontHeight() / 2 + "%;"); // 字体大小 int columnWidth = sheet.getColumnWidth(cell.getColumnIndex()) ; sb.append("" + columnWidth + "px;"); XSSFColor xc = xf.getXSSFColor(); if (xc != null && !"".equals(xc)) { sb.append("color:#" + xc.getARGBHex().substring(2) + ";"); // 字体颜色 } XSSFColor bgColor = (XSSFColor) cellStyle.getFillForegroundColorColor(); //System.out.println("************************************"); //System.out.println("BackgroundColorColor: "+cellStyle.getFillBackgroundColorColor()); //System.out.println("ForegroundColor: "+cellStyle.getFillForegroundColor());//0 //System.out.println("BackgroundColorColor: "+cellStyle.getFillBackgroundColorColor()); //System.out.println("ForegroundColorColor: "+cellStyle.getFillForegroundColorColor()); //String bgColorStr = bgColor.getARGBHex(); //System.out.println("bgColorStr: "+bgColorStr); if (bgColor != null && !"".equals(bgColor)) { sb.append("background-color:#" + bgColor.getARGBHex().substring(2) + ";"); // 鑳屾櫙棰滆壊 } sb.append(getBorderStyle(0,cellStyle.getBorderTop(), ((XSSFCellStyle) cellStyle).getTopBorderXSSFColor())); sb.append(getBorderStyle(1,cellStyle.getBorderRight(), ((XSSFCellStyle) cellStyle).getRightBorderXSSFColor())); sb.append(getBorderStyle(2,cellStyle.getBorderBottom(), ((XSSFCellStyle) cellStyle).getBottomBorderXSSFColor())); sb.append(getBorderStyle(3,cellStyle.getBorderLeft(), ((XSSFCellStyle) cellStyle).getLeftBorderXSSFColor())); }else if(wb instanceof HSSFWorkbook){ HSSFFont hf = ((HSSFCellStyle) cellStyle).getFont(wb); short boldWeight = hf.getBoldweight(); short fontColor = hf.getColor(); sb.append("style='"); HSSFPalette palette = ((HSSFWorkbook) wb).getCustomPalette(); // 绫籋SSFPalette鐢ㄤ簬姹傜殑棰滆壊鐨勫浗闄呮爣鍑嗗舰寮� HSSFColor hc = palette.getColor(fontColor); sb.append("font-weight:" + boldWeight + ";"); // 瀛椾綋鍔犵矖 sb.append("font-size: " + hf.getFontHeight() / 2 + "%;"); // 瀛椾綋澶у皬 String fontColorStr = convertToStardColor(hc); if (fontColorStr != null && !"".equals(fontColorStr.trim())) { sb.append("color:" + fontColorStr + ";"); // 瀛椾綋棰滆壊 } int columnWidth = sheet.getColumnWidth(cell.getColumnIndex()) ; sb.append("" + columnWidth + "px;"); short bgColor = cellStyle.getFillForegroundColor(); hc = palette.getColor(bgColor); String bgColorStr = convertToStardColor(hc); if (bgColorStr != null && !"".equals(bgColorStr.trim())) { sb.append("background-color:" + bgColorStr + ";"); // 鑳屾櫙棰滆壊 } sb.append( getBorderStyle(palette,0,cellStyle.getBorderTop(),cellStyle.getTopBorderColor())); sb.append( getBorderStyle(palette,1,cellStyle.getBorderRight(),cellStyle.getRightBorderColor())); sb.append( getBorderStyle(palette,3,cellStyle.getBorderLeft(),cellStyle.getLeftBorderColor())); sb.append( getBorderStyle(palette,2,cellStyle.getBorderBottom(),cellStyle.getBottomBorderColor())); } sb.append("' "); } } /** * 单元格内容的水平对齐方式 * @param alignment * @return */ private static String convertAlignToHtml(short alignment) { String align = "left"; switch (alignment) { case CellStyle.ALIGN_LEFT: align = "left"; break; case CellStyle.ALIGN_CENTER: align = "center"; break; case CellStyle.ALIGN_RIGHT: align = "right"; break; default: break; } return align; } /** * 单元格中内容的垂直排列方式 * @param verticalAlignment * @return */ private static String convertVerticalAlignToHtml(short verticalAlignment) { String valign = "middle"; switch (verticalAlignment) { case CellStyle.VERTICAL_BOTTOM: valign = "bottom"; break; case CellStyle.VERTICAL_CENTER: valign = "center"; break; case CellStyle.VERTICAL_TOP: valign = "top"; break; default: break; } return valign; } private static String convertToStardColor(HSSFColor hc) { StringBuffer sb = new StringBuffer(""); if (hc != null) { if (HSSFColor.AUTOMATIC.index == hc.getIndex()) { return null; } sb.append("#"); for (int i = 0; i < hc.getTriplet().length; i++) { sb.append(fillWithZero(Integer.toHexString(hc.getTriplet()[i]))); } } return sb.toString(); } private static String fillWithZero(String str) { if (str != null && str.length() < 2) { return "0" + str; } return str; } static String[] bordesr={"border-top:","border-right:","border-bottom:","border-left:"}; static String[] borderStyles={"solid ","solid ","solid ","solid ","solid ","solid ","solid ","solid ","solid ","solid","solid","solid","solid","solid"}; private static String getBorderStyle( HSSFPalette palette ,int b,short s, short t){ if(s==0)return bordesr[b]+borderStyles[s]+"#d0d7e5 1px;";; String borderColorStr = convertToStardColor( palette.getColor(t)); borderColorStr=borderColorStr==null|| borderColorStr.length()<1?"#000000":borderColorStr; return bordesr[b]+borderStyles[s]+borderColorStr+" 1px;"; } private static String getBorderStyle(int b,short s, XSSFColor xc){ if(s==0)return bordesr[b]+borderStyles[s]+"#d0d7e5 1px;";; if (xc != null && !"".equals(xc)) { String borderColorStr = xc.getARGBHex();//t.getARGBHex(); borderColorStr=borderColorStr==null|| borderColorStr.length()<1?"#000000":borderColorStr.substring(2); return bordesr[b]+borderStyles[s]+borderColorStr+" 1px;"; } return ""; } }
3. 编写Controller类
package com.sd.sdcj.controller.excel_html; import java.io.BufferedReader; import java.io.File; import java.io.FileReader; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; import com.sd.cloud.constant.SDConstants; import com.sd.sdcj.util.excel.POIReadExcelToHtml; @Controller @RequestMapping(value="/excel_html") public class Excel_Html { @RequestMapping(value="/look") public void look(HttpServletRequest request,HttpServletResponse response, @RequestParam(value="fileName") String fileName ){ System.out.println(fileName); if(fileName!=null){ fileName=SDConstants.fileDir+fileName.substring(fileName.indexOf("fileName=")+9,fileName.indexOf("?oldFileName=")); //excel名字 String excle=fileName; //转换 String fileType = excle.substring(excle.lastIndexOf(".")+1); System.out.println(fileType); if("xls".equalsIgnoreCase(fileType)||"xlsx".equalsIgnoreCase(fileType)||"xlsm".equalsIgnoreCase(fileType)){ //读取显示 //以下是读取excel fileName=fileName.substring(0,fileName.lastIndexOf("."))+".html"; System.out.println(""); //判断是否已经转换过 if(!new File(fileName).exists()){ POIReadExcelToHtml.pdf2html(excle); } System.out.println(fileName); PrintWriter writer=null; BufferedReader br=null; try { request.setCharacterEncoding("utf-8"); response.setHeader("Content-type", "text/html;charset=UTF-8"); response.setCharacterEncoding("utf-8"); writer = response.getWriter(); br=new BufferedReader(new FileReader(new File(fileName))); String html=null; while((html = br.readLine()) != null){ writer.write(html); } } catch (IOException e) { e.printStackTrace(); }finally{ if(writer!=null){ writer.close(); } if(br!=null){ try { br.close(); } catch (IOException e) { e.printStackTrace(); } } } } } } }