一.js版:
示例：
var tb = document.getElementById("testtable");autoRowSpan(tb,0,0,tb.rows.length-1,true,3);//效果如下：
autoRowSpan(tb,0,0,tb.rows.length-1,false,null);autoRowSpan(tb,1,0,tb.rows.length-1,false,null);autoRowSpan(tb,2,0,tb.rows.length-1,false,null);//效果如下：
autoRowSpan(tb,2,0,tb.rows.length-1,true,0);//效果如下：
//付详细代码：/***tbDom table 元素，tbody也可以*colIndex 合并的列索引*startRow 起始行号*endRow 终止行号*isForward 是否递进合并其他列*forwardToIndex 递进至第几列*/function autoRowSpan(tbDom,colIndex,startRow,endRow,isForward,forwardToIndex){alert(colIndex+"|"+startRow+"|"+ endRow +"|"+ isForward +"|"+forwardToIndex );var rowspanIdx = startRow;//var pos = 1;var compareValue = null;for(var i=startRow; i<=endRow; ++i){if(i == startRow){//取得起始行数据compareValue = tbDom.rows[i].cells[colIndex].innerText;}else{//var tmpValue = tbDom.rows[i].cells[colIndex].innerText;if(compareValue == tmpValue){//与起始行单元格相同，则隐藏当前单元格pos++;tbDom.rows[i].cells[colIndex].style.display="none";}else{与起始行单元格不同，则设置起始行rowspan，并更新变量数据compareValue = tmpValue;if(pos>1){//存在相同单元格tbDom.rows[rowspanIdx].cells[colIndex].rowSpan = pos;//是否递进合并下一列if(isForward){var nextColIndex = colIndex;var tmpStartRow = rowspanIdx;var tmpEndRow = rowspanIdx + pos -1 ;if(colIndex < forwardToIndex)nextColIndex++;if(colIndex > forwardToIndex)nextColIndex--;if(colIndex == forwardToIndex)return;doRowspanTask(autoRowSpan,tbDom,nextColIndex,tmpStartRow,tmpEndRow,isForward,forwardToIndex);}}pos = 1;rowspanIdx = i;}}}if(pos>1){tbDom.rows[rowspanIdx].cells[colIndex].rowSpan = pos;//是否递进合并下一列if(isForward){var nextColIndex = colIndex;var tmpStartRow = rowspanIdx;var tmpEndRow = rowspanIdx + pos - 1 ;if(colIndex < forwardToIndex)nextColIndex++;if(colIndex > forwardToIndex)nextColIndex--;if(colIndex == forwardToIndex)return;doRowspanTask(autoRowSpan,tbDom,nextColIndex,tmpStartRow,tmpEndRow,isForward,forwardToIndex);}pos =1;rowspanIdx = rowspanIdx + pos -1;}}//防止递归过多导致内存溢出function doRowspanTask(func){if(typeof func =='function'){var args = Array.prototype.slice.call(arguments,1);var f = function(){func.apply(null,args);}return window.setTimeout(f,0);}}
java 版：
excel效果同js一样，这里就直接贴代码：
/*** * @param sheet * @param colIdx合并的列* @param startRow起始行* @param stopRow结束行* @param isForward是否递进合并其它列* @param forwardToColIdx 递进到的列*/public void mergeRowCell(HSSFSheet sheet,int colIdx,int startRow,int stopRow ,boolean isForward,int forwardToColIdx){String compareValue = null;int beginRow = startRow;int endRow = startRow;for(int i=startRow;i<=stopRow; ++i){String value = sheet.getRow(i).getCell(colIdx).getRichStringCellValue()==null ? "":sheet.getRow(i).getCell(colIdx).getRichStringCellValue().toString();if(i == startRow){compareValue = value;}else{if(compareValue.equals(value)){//相同，则设置重复的值为空sheet.getRow(i).getCell(colIdx).setCellValue("");endRow = i;}else {//不同，则合并之前相同的单元格if(beginRow < endRow){sheet.addMergedRegion(new CellRangeAddress(beginRow,endRow,colIdx,colIdx));if(isForward){//递进合并下一列int nextColIndex = colIdx;if(colIdx < forwardToColIdx){nextColIndex ++;}else if(colIdx > forwardToColIdx){nextColIndex --;}else{return;}mergeRowCell(sheet, nextColIndex, beginRow, endRow, isForward, forwardToColIdx);}}compareValue = value;beginRow = i;endRow = i;}}}if(beginRow < endRow){sheet.addMergedRegion(new CellRangeAddress(beginRow,endRow,colIdx,colIdx));if(isForward){//递进合并下一列int nextColIndex = colIdx;if(colIdx < forwardToColIdx){nextColIndex ++;}else if(colIdx > forwardToColIdx){nextColIndex --;}else{return;}mergeRowCell(sheet, nextColIndex, beginRow, endRow, isForward, forwardToColIdx);}}}
