大致代码在网上百度的，稍微有些改动。完善单元格文字居中，列的宽度随单元格内容改变，合并单元格边框显示不全的问题。

package com.wisdombud.szxtyms.business.util;import java.util.ArrayList;
import java.util.List;import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.math.NumberUtils;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFCellUtil;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.util.CellRangeAddress;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;import com.wisdombud.szxtyms.util.CrossRangeCellMeta;/***** html转excel* @author user**/
public class ConvertHtml2Excel {/*** html表格转excel* * @param tableHtml 如*            <table>*            ..*            </table>* @return*/public static HSSFWorkbook table2Excel(String tableHtml) {HSSFWorkbook wb = new HSSFWorkbook();HSSFSheet sheet = wb.createSheet();List<CrossRangeCellMeta> crossRowEleMetaLs = new ArrayList<CrossRangeCellMeta>();int rowIndex = 0;try {Document data = DocumentHelper.parseText(tableHtml);// 生成表头Element thead = data.getRootElement().element("thead");HSSFCellStyle titleStyle = getTitleStyle(wb);int ls=0;//列数if (thead != null) {List<Element> trLs = thead.elements("tr");for (Element trEle : trLs) {HSSFRow row = sheet.createRow(rowIndex);List<Element> thLs = trEle.elements("th");ls=thLs.size();makeRowCell(thLs, rowIndex, row, 0, titleStyle, crossRowEleMetaLs);rowIndex++;}}// 生成表体Element tbody = data.getRootElement().element("tbody");HSSFCellStyle contentStyle = getContentStyle(wb);if (tbody != null) {List<Element> trLs = tbody.elements("tr");for (Element trEle : trLs) {HSSFRow row = sheet.createRow(rowIndex);List<Element> thLs = trEle.elements("th");int cellIndex = makeRowCell(thLs, rowIndex, row, 0, titleStyle, crossRowEleMetaLs);List<Element> tdLs = trEle.elements("td");makeRowCell(tdLs, rowIndex, row, cellIndex, contentStyle, crossRowEleMetaLs);                    rowIndex++;}}// 合并表头for (CrossRangeCellMeta crcm : crossRowEleMetaLs) {sheet.addMergedRegion(new CellRangeAddress(crcm.getFirstRow(), crcm.getLastRow(), crcm.getFirstCol(), crcm.getLastCol()));setRegionStyle(sheet, new CellRangeAddress(crcm.getFirstRow(), crcm.getLastRow(), crcm.getFirstCol(), crcm.getLastCol()),contentStyle);}for(int i=0;i<ls;i++){sheet.autoSizeColumn(i, true);//设置列宽}} catch (DocumentException e) {e.printStackTrace();}return wb;}/*** 生产行内容* * @return 最后一列的cell index*//*** @param tdLs th或者td集合* @param rowIndex 行号* @param row POI行对象* @param startCellIndex* @param cellStyle 样式* @param crossRowEleMetaLs 跨行元数据集合* @return*/private static int makeRowCell(List<Element> tdLs, int rowIndex, HSSFRow row, int startCellIndex, HSSFCellStyle cellStyle,List<CrossRangeCellMeta> crossRowEleMetaLs) {int i = startCellIndex;for (int eleIndex = 0; eleIndex < tdLs.size(); i++, eleIndex++) {int captureCellSize = getCaptureCellSize(rowIndex, i, crossRowEleMetaLs);while (captureCellSize > 0) {for (int j = 0; j < captureCellSize; j++) {// 当前行跨列处理（补单元格）row.createCell(i);i++;}captureCellSize = getCaptureCellSize(rowIndex, i, crossRowEleMetaLs);}Element thEle = tdLs.get(eleIndex);String val = thEle.getTextTrim();if (StringUtils.isBlank(val)) {Element e = thEle.element("a");if (e != null) {val = e.getTextTrim();}}HSSFCell c = row.createCell(i);if (NumberUtils.isNumber(val)) {c.setCellValue(Double.parseDouble(val));c.setCellType(HSSFCell.CELL_TYPE_NUMERIC);} else {c.setCellValue(val);}int rowSpan = NumberUtils.toInt(thEle.attributeValue("rowspan"), 1);int colSpan = NumberUtils.toInt(thEle.attributeValue("colspan"), 1);c.setCellStyle(cellStyle);if (rowSpan > 1 || colSpan > 1) { // 存在跨行或跨列crossRowEleMetaLs.add(new CrossRangeCellMeta(rowIndex, i, rowSpan, colSpan));}if (colSpan > 1) {// 当前行跨列处理（补单元格）for (int j = 1; j < colSpan; j++) {i++;row.createCell(i);}}}return i;}/*** 设置合并单元格的边框样式* * @param sheet* @param region* @param cs*/public static void setRegionStyle(HSSFSheet sheet, CellRangeAddress region, HSSFCellStyle cs) {for (int i = region.getFirstRow(); i <= region.getLastRow(); i++) {HSSFRow row = HSSFCellUtil.getRow(i, sheet);for (int j = region.getFirstColumn(); j <= region.getLastColumn(); j++) {HSSFCell cell = HSSFCellUtil.getCell(row, (short) j);cell.setCellStyle(cs);}}}/*** 获得因rowSpan占据的单元格* * @param rowIndex 行号* @param colIndex 列号* @param crossRowEleMetaLs 跨行列元数据* @return 当前行在某列需要占据单元格*/private static int getCaptureCellSize(int rowIndex, int colIndex, List<CrossRangeCellMeta> crossRowEleMetaLs) {int captureCellSize = 0;for (CrossRangeCellMeta crossRangeCellMeta : crossRowEleMetaLs) {if (crossRangeCellMeta.getFirstRow() < rowIndex && crossRangeCellMeta.getLastRow() >= rowIndex) {if (crossRangeCellMeta.getFirstCol() <= colIndex && crossRangeCellMeta.getLastCol() >= colIndex) {captureCellSize = crossRangeCellMeta.getLastCol() - colIndex + 1;}}}return captureCellSize;}/*** 获得标题样式* * @param workbook* @return*/private static HSSFCellStyle getTitleStyle(HSSFWorkbook workbook) {short titlebackgroundcolor = HSSFColor.GREY_25_PERCENT.index;short fontSize = 12;String fontName = "宋体";HSSFCellStyle style = workbook.createCellStyle();style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);style.setAlignment(HSSFCellStyle.ALIGN_CENTER);style.setBorderBottom(HSSFCellStyle.BORDER_THIN); //下边框style.setBorderLeft(HSSFCellStyle.BORDER_THIN);//左边框style.setBorderTop(HSSFCellStyle.BORDER_THIN);//上边框style.setBorderRight(HSSFCellStyle.BORDER_THIN);//右边框style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);style.setFillForegroundColor(titlebackgroundcolor);// 背景色HSSFFont font = workbook.createFont();font.setFontName(fontName);font.setFontHeightInPoints(fontSize);font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);style.setFont(font);return style;}/*** 获得内容样式* * @param wb* @return*/private static HSSFCellStyle getContentStyle(HSSFWorkbook wb) {short fontSize = 12;String fontName = "宋体";HSSFCellStyle style = wb.createCellStyle();style.setBorderBottom((short) 1);style.setBorderTop((short) 1);style.setBorderLeft((short) 1);style.setBorderRight((short) 1);HSSFFont font = wb.createFont();font.setFontName(fontName);font.setFontHeightInPoints(fontSize);style.setFont(font);style.setAlignment(HSSFCellStyle.ALIGN_CENTER);//水平居中 style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);//垂直居中return style;}
}

封装跨行元素的信息

package com.wisdombud.szxtyms.util;/*** table转excel* 跨行元素元数据* */
public class CrossRangeCellMeta {public CrossRangeCellMeta(int firstRowIndex, int firstColIndex, int rowSpan, int colSpan) {super();this.firstRowIndex = firstRowIndex;this.firstColIndex = firstColIndex;this.rowSpan = rowSpan;this.colSpan = colSpan;}private int firstRowIndex;private int firstColIndex;private int rowSpan;// 跨越行数private int colSpan;// 跨越列数public int getFirstRow() {return firstRowIndex;}public int getLastRow() {return firstRowIndex + rowSpan - 1;}public int getFirstCol() {return firstColIndex;}public int getLastCol() {return firstColIndex + colSpan - 1;}public int getColSpan(){return colSpan;}
}