前面部分是当时查询的记录：
实现Excel文件单元格合并、冻结和文件导出
Workbook wb = new HSSFWorkbook();Sheet sheet = wb.createSheet("sheet1");Row row = null;Cell cell = null;//创建表头单元格样式CellStyle cs_header = wb.createCellStyle();Font boldFont = wb.createFont();boldFont.setFontName("Consolas");boldFont.setFontHeightInPoints((short)14);cs_header.setFont(boldFont);cs_header.setBorderBottom((short)1);cs_header.setBorderLeft((short)1);cs_header.setBorderRight((short)1);cs_header.setBorderTop((short)1);//第一行，时间row = sheet.createRow((short)0);row.setHeightInPoints((short)24);createMultiCell(row,cell,cs_header,0,31,"访问日期："+time1+" to "+time2);//第二行，大标题row = sheet.createRow((short)1);row.setHeightInPoints((short)24);createMultiCell(row,cell,cs_header,0,6," ");createMultiCell(row,cell,cs_header,6,25,"访问路径");//第三行，列标题row = sheet.createRow((short)2);row.setHeightInPoints((short)24);String[] headers = new String[]{"访问时间","地域","来源","关键字","进入页","停留时间","访问页数","1时间","1停留","1页面","2时间","2停留","2页面","3时间","3停留","3页面","4时间","4停留","4页面","5时间","5停留","5页面","6时间","6停留","6页面","7时间","7停留","7页面","8时间","8停留","8页面"};for(int i=0; i<headers.length; i++){cell = row.createCell((short)i);cell.setCellValue(headers[i]);cell.setCellStyle(cs_header);}//创建文本单元格样式CellStyle cs_text = wb.createCellStyle();Font textFont = wb.createFont();textFont.setFontName("Consolas");textFont.setFontHeightInPoints((short)10);cs_text.setFont(textFont);cs_text.setBorderBottom((short)1);cs_text.setBorderLeft((short)1);cs_text.setBorderRight((short)1);cs_text.setBorderTop((short)1);//将数据写入表格for(int i=0; i<list.size(); i++){row = sheet.createRow((short)(i+3));Object[] rw = list.get(i);for(int j=0; j<rw.length; j++){cell = row.createCell((short)j);cell.setCellValue(rw[j].toString());cell.setCellStyle(cs_text);}}//合并第1行1-32列sheet.addMergedRegion(new CellRangeAddress((short)0, (short)0, (short)0, (short)31));//合并第2行1-6列sheet.addMergedRegion(new CellRangeAddress((short)1, (short)1, (short)0, (short)6));//合并第2行7-32行sheet.addMergedRegion(new CellRangeAddress((short)1, (short)1, (short)7, (short)31));//冻结7X3(宽,高)区域中的单元格sheet.createFreezePane(7, 3);try {//将workbook写到输入流(下载时候，这个输出流可能是ServletOutStream，写入文件是FileOutputStream，等等)wb.write(os);} catch (IOException e) {e.printStackTrace();}
上文原文链接：原文地址
导出Excel每列求和,POI导出excel执行自动求和
for(int i = 0; i < arrSize; i++) {JSONObject item = dataListArr.getJSONObject(i);HSSFRow row = sheet.createRow(i + 1);HSSFCell cell0 = row.createCell(0);cell0.setCellValue(i + 1);HSSFCell cell1 = row.createCell(1);cell1.setCellValue(item.get("farmerName") != null ? item.get("farmerName").toString() : "");HSSFCell cell2 = row.createCell(2);//0对应的是double型数值 新版本此方法过期可以用新方法cell2.setCellType(0);cell2.setCellValue(item.get("crabCultivationSpecification") != null ? Double.valueOf(item.get("crabCultivationSpecification").toString()) : 0.0);...HSSFCell cell8 = row.createCell(8);cell8.setCellValue(item.get("cultivationTime") != null && !"".equals(item.get("cultivationTime").toString())? BusinessService.formatTime(item.get("cultivationTime").toString().substring(0, 8)) : "");}//合计功能 sum也可以替换成其他的函数HSSFRow row = sheet.createRow(arrSize+1);HSSFCell cell = row.createCell(0);cell.setCellValue("合计"); for (int i = 2; i < 8; i++) {//i代表是第几列cell = row.createCell(i);//设置公式前，一定要先建立表格String colString = CellReference.convertNumToColString(i); //长度转成ABC列String sumstring = "SUM(" + colString + "2:" + colString + (arrSize+1) + ")";//求和公式sheet.getRow(arrSize+1).getCell(i).setCellFormula(sumstring);}
需要注意的是:
arrSize代表是行数,在求和公式中arrSize需要+1,不然统计的行数不正确,因为合计是占一行的(想不明白就自己新建个excel),同理求和函数也可以换成excel中其他的函数.
String colString = CellReference.convertNumToColString(i);
//长度转成ABC列这句话就是把行列转成ABCD那种格式,想想求和公式=SUM(A1:A4)就是转成里面的A这种,实在想不明白就别想了,记住要加就行.
期间遇到一个问题就是,数据库导出的数据写到excel中是String格式,后来百度了一下才知道,源数据是什么类型写到excel中就是什么类型,用cell2.setCellType(0);就行.
原文：原文
本人在实际运用时：
ExcelWriter writer = ExcelUtil.getBigWriter();//为大标题小标题先添加行if(StrUtil.isNotBlank(titleName)) {rows.add(0, Collections.emptyList());y++;}else {if (StrUtil.isNotBlank(description)) {for (int i = 0; i < y; i++) {rows.add(i, Collections.emptyList());}}}if(StrUtil.isNotBlank(minTitle)){rows.add(0, Collections.emptyList());y++;}//添加字段-标题到首行titleList.addAll(multiDataTitle.values());rows.add(y, titleList);//添加需要合计的列int rowNum = rows.size() + 1;if(!CollectionUtils.isEmpty(sumCellList)){rowNum = this.handelSumColum(writer, rows, sumCellList, columnList, y);}//合并计算出来的合并对象writer.write(rows,true);if(StrUtil.isNotBlank(minTitle)){//设置查询时间writer.merge(1, 1, 0, Math.max(titleList.size()-1,x), new HSSFRichTextString(minTitle), false);}if(StrUtil.isNotBlank(titleName)){writeTitle(titleName, writer, Math.max(titleList.size()-1,x), rowNum, minTitle, y);}else {if (StrUtil.isNotBlank(description)) {writeDescription(excelFile.description(), writer, Math.max(titleList.size()-1,x), y);}}
private int handelSumColum(ExcelWriter writer, List<List<Object>> rows, List<Integer> sumCellList, List<Object> columnList, int y){Row row = writer.getSheet().createRow(rows.size());for (Integer i : sumCellList) {Cell cell = row.createCell(i-1);String colString = CellReference.convertNumToColString(i-1);//长度转成ABC列//y为标题行，y+1为 数据开始行String sumString = "SUM(" + colString + (y+1) +":" + colString + rows.size() + ")";cell.setCellFormula(sumString);// 把公式塞入合计列CellStyle cellStyle = cell.getCellStyle();cellStyle.setBorderRight(BorderStyle.THIN);cellStyle.setBorderLeft(BorderStyle.THIN);cellStyle.setAlignment(HorizontalAlignment.CENTER);}//获取合计list中第一个值为columnList的下标，即为第一个要合计的值在excel中的实际列int index = columnList.indexOf(sumCellList.stream().findFirst().get()) - 1;//设置合计列if(index > 0){writer.merge(row.getRowNum(), row.getRowNum(), 0, index, new HSSFRichTextString("合计"), false);}else{writer.writeCellValue(index, row.getRowNum(), "合计");}return row.getRowNum();}
private void writeTitle(String title, ExcelWriter writer, int x, int rowNum, String minTitle, int y){//设置标题头writer.merge(0, 0, 0, x, new HSSFRichTextString(title), true);StyleSet style = writer.getStyleSet();CellStyle cellStyle = style.getHeadCellStyle();cellStyle.setAlignment(HorizontalAlignment.CENTER);Font font = writer.createFont();font.setFontName("MS Sans Serif");font.setBold(true);font.setFontHeightInPoints((short) 24); //字体大小cellStyle.setFont(font);cellStyle.setFillForegroundColor(IndexedColors.WHITE.getIndex());writer.setStyle(cellStyle, 0, 0);//设置表头样式CellStyle headStyle = style.getHeadCellStyle();Font headFont = writer.createFont();headFont.setBold(true);headFont.setFontName("微软雅黑");headFont.setFontHeightInPoints((short) 10);headStyle.setFont(headFont);headStyle.setAlignment(HorizontalAlignment.CENTER);for (int i = 0; i <= x ; i++) {headStyle.setBorderRight(BorderStyle.THIN);writer.setStyle(headStyle, i, y);}//设置表格外框线加粗Sheet sheet = writer.getSheet();CellRangeAddress cra =new CellRangeAddress(0, 0, 0, x);CellRangeAddress lastCra =new CellRangeAddress(0, rowNum, 0, x);CellRangeAddress rightCra =new CellRangeAddress(1, rowNum, 0, x);CellRangeAddress leftCra =new CellRangeAddress(1, rowNum, 0, x);RegionUtil.setBorderBottom(BorderStyle.THICK, cra, sheet);RegionUtil.setBorderBottom(BorderStyle.THICK, lastCra, sheet);RegionUtil.setBorderRight(BorderStyle.THICK, rightCra, sheet);RegionUtil.setBorderLeft(BorderStyle.THICK, leftCra, sheet);//冻结x*y(宽,高)区域中的单元格//y+1，y表示添加的标题行，+1表示数据抬头行sheet.createFreezePane(0, y+1);}
最终样式：
这里前三行是冻结了的，
x为列，y为行，+1 or -1 是因为有下标的原因，为达到指定的列or行。
主要用hutool集成下的方法，所以上边部分方法是来自hutool，方法都差不多。
后期需要设置指定列的样式，如对齐等
先在自定义注解中引用且默认设置为居中
HorizontalAlignment alignmentStyle() default HorizontalAlignment.CENTER;
在模板中使用时，设置该列对齐方式。alignmentStyle = HorizontalAlignment.RIGHT
/*** name*/@ExcelRow(hand = "name", column = 1,alignmentStyle = HorizontalAlignment.RIGHT)private String name;/*** num*/@ExcelRow(hand = "num", column = 2, isSum = true, alignmentStyle = HorizontalAlignment.LEFT)private Integer num;
再获取要自定义设置的列和样式，用MAP记录。
Map<Integer, HorizontalAlignment> columStyle = new HashMap<>();if(null != excelRow && null != excelRow.alignmentStyle()){columStyle.put(excelRow.column(),excelRow.alignmentStyle());}
再将指定的单元格进行设置样式。
Sheet sheet1 = writer.getSheet();Workbook workbook = sheet1.getWorkbook();if(!columStyle.isEmpty()){for (int i = y+1; i < rows.size(); i++) {for (int j = 0; j <= Math.max(titleList.size(),x); j++) {if(columStyle.containsKey(j)){HorizontalAlignment horizontalAlignment = columStyle.get(j);generateRowAndCell(sheet1,workbook,i,j-1,horizontalAlignment, VerticalAlignment.BOTTOM);}}}}
private void generateRowAndCell(Sheet sheet, Workbook workbook, int rowIndex, int cellIndex,HorizontalAlignment horizontalAlignment, VerticalAlignment verticalAlignment) {// 创建row，获取行Row row = sheet.getRow(rowIndex);// 创建cell, 设置样式，获取列Cell cell = row.getCell(cellIndex);CellStyle cellStyle = workbook.createCellStyle();// 水平对齐cellStyle.setAlignment(horizontalAlignment);// 垂直对齐cellStyle.setVerticalAlignment(verticalAlignment);cellStyle.setBorderLeft(BorderStyle.THIN);cellStyle.setBorderBottom(BorderStyle.THIN);cell.setCellStyle(cellStyle);}
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