JAVA POI导出EXCEL设置自定义样式（线框加粗，合并指定行，合计求和，冻结行）

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; 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; isize(); i++){
			row = sheet.createRow((short)(i+3));
			Object[] rw = list.get(i);
			for(int j=0; j; 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> rows, List sumCellList, List