比较好的实现方式是通过提前做好excel文件，然后使用这个做好的excel文件作为模板，使用poi读入这个文件，将需要的值填入；这样就不要编程来设置行宽的样式；
效果：
代码：
//时间
String checkTime = "yyyy/MM/dd";
//人员查询
Set preParticipantNames = new HashSet();
HSSFWorkbook wb = new HSSFWorkbook();
// 生成一个样式
HSSFCellStyle style = wb.createCellStyle();
this.setHSSFCellBorder(style);
style.setAlignment(HSSFCellStyle.ALIGN_CENTER);// 设置单元格为水平对齐的类型
style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
HSSFFont songFont = createSongFont(wb);
style.setFont(songFont);
HSSFCellStyle songPoint14FontStyle = wb.createCellStyle();
this.setHSSFCellBorder(songPoint14FontStyle);
songPoint14FontStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
songPoint14FontStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);// 设置单元格为水平对齐的类型
HSSFFont songPoint14Font = createSongFont(wb);
songPoint14Font.setFontHeightInPoints((short) 14); //设置字号
songPoint14FontStyle.setFont(songPoint14Font);
HSSFCellStyle arialFontStyle = wb.createCellStyle();
this.setHSSFCellBorder(arialFontStyle);
arialFontStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
arialFontStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);// 设置单元格为水平对齐的类型
HSSFFont arialFont = createSongFont(wb);
arialFont.setFontName("Arial");
arialFontStyle.setFont(arialFont);
HSSFCellStyle rightBoldStyle = wb.createCellStyle();
rightBoldStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
rightBoldStyle.setAlignment(HSSFCellStyle.ALIGN_RIGHT);// 设置单元格为水平对齐的类型
HSSFFont boldSongFont = createSongFont(wb);
boldSongFont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);//粗体显示
rightBoldStyle.setFont(boldSongFont);
HSSFCellStyle songPoint22RedFontStyle = wb.createCellStyle();
songPoint22RedFontStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
songPoint22RedFontStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);// 设置单元格为水平对齐的类型
HSSFFont songPoint22RedFont = createSongFont(wb);
songPoint22RedFont.setFontHeightInPoints((short) 22); //设置字号
songPoint22RedFont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);//粗体显示
songPoint22RedFont.setColor(HSSFColor.RED.index);
songPoint22RedFontStyle.setFont(songPoint22RedFont);
HSSFCellStyle contentDefaultStyle = wb.createCellStyle();
this.setHSSFCellBorder(contentDefaultStyle);
contentDefaultStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
contentDefaultStyle.setFont(songFont);
HSSFCellStyle verticalStyle = wb.createCellStyle();
this.setHSSFCellBorder(verticalStyle);
verticalStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);// 设置单元格为水平对齐的类型
verticalStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
verticalStyle.setFont(songFont);
// 建立新的sheet对象（excel的表单）
HSSFSheet sheet = wb.createSheet(excelFileName);
sheet.setColumnWidth(0,15* 256);
sheet.setColumnWidth(1,15* 256);
sheet.setColumnWidth(2,60* 256);
sheet.setColumnWidth(3,15* 256);
sheet.addMergedRegion(new CellRangeAddress(0,1,0,3));
sheet.addMergedRegion(new CellRangeAddress(2,3,0,3));
sheet.addMergedRegion(new CellRangeAddress(4,5,0,0));
sheet.addMergedRegion(new CellRangeAddress(4,5,1,1));
sheet.addMergedRegion(new CellRangeAddress(4,5,2,2));
sheet.addMergedRegion(new CellRangeAddress(4,5,3,3));
int beginRowIndex = 6;
int endRowIndex = 6;
//要获总记录，下一步来确定合并的单元格的数量
List<TbCheckSamplEventReportVo> detailList = this.checkCountDao.getCheckResultDaily(checkEventCountDto);
if (detailList != null && detailList.size() > 0) {
endRowIndex += detailList.size() -1;
log.info("detailList.size() " + detailList.size());
}
sheet.addMergedRegion(new CellRangeAddress(beginRowIndex,endRowIndex,0,0));
int sumScore = 0;
for (int i = beginRowIndex; i <= endRowIndex; i++) {
int j = i - beginRowIndex;
sheet.addMergedRegion(new CellRangeAddress(i,i,1,3));
HSSFRow row = sheet.createRow(i);
if (i == beginRowIndex) {
HSSFCell problemTextCell = row.createCell(0);
problemTextCell.setCellValue("问题");
problemTextCell.setCellStyle(verticalStyle);
}
StringBuilder contentDetail = new StringBuilder();
if (detailList != null && detailList.size() > 0) {
BigDecimal checkScore = detailList.get(j).getCheckScore() == null ? null : detailList.get(j).getCheckScore();
if (checkScore != null) {
sumScore += checkScore.intValue();
}
if (detailList.get(j).getPreParticipantName() != null) {
preParticipantNames.add(detailList.get(j).getPreParticipantName());
}
contentDetail.append(j+1).append(".").append(detailList.get(j).getDesc()).append(" ").append("xxx").append(checkScore == null ? "" : checkScore.intValue())
.append("xxx(").append(detailList.get(j).getCheckTypeName()).append(")");
}
HSSFCell cell = row.createCell(1);
cell.setCellValue(contentDetail.toString());
cell.setCellStyle(contentDefaultStyle);
HSSFCell cell2 = row.createCell(2);
cell2.setCellStyle(contentDefaultStyle);
HSSFCell cell3 = row.createCell(3);
cell3.setCellStyle(contentDefaultStyle);
}
//合计
sheet.addMergedRegion(new CellRangeAddress(endRowIndex+1,endRowIndex+1,1,3));
//人员
sheet.addMergedRegion(new CellRangeAddress(endRowIndex+2,endRowIndex+2,1,3));
HSSFRow row0 = sheet.createRow(0);
HSSFCell row0Cell0 = row0.createCell(0);
row0Cell0.setCellValue("xxxxxx");
row0Cell0.setCellStyle(songPoint22RedFontStyle);
HSSFRow row1 = sheet.createRow(2);
HSSFCell row1Cell0 = row1.createCell(0);
row1Cell0.setCellValue(checkEventCountDto.getCompanyName());
row1Cell0.setCellStyle(rightBoldStyle);
//5行
HSSFRow row2 = sheet.createRow(4);
HSSFCell row2Cell0 = row2.createCell(0);
row2Cell0.setCellStyle(style);
HSSFCell row2Cell1 = row2.createCell(1);
row2Cell1.setCellStyle(style);
HSSFCell row2Cell2 = row2.createCell(2);
row2Cell2.setCellStyle(style);
row2Cell2.setCellValue("时间");
HSSFCell row2Cell3 = row2.createCell(3);
row2Cell3.setCellValue(checkTime);
row2Cell3.setCellStyle(arialFontStyle);
//6行
HSSFRow row3 = sheet.createRow(5);
HSSFCell row3Cell0 = row3.createCell(0);
row3Cell0.setCellStyle(style);
HSSFCell row3Cell1 = row3.createCell(1);
row3Cell1.setCellStyle(style);
HSSFCell row3Cell2 = row3.createCell(2);
row3Cell2.setCellStyle(style);
HSSFCell row3Cell3 = row3.createCell(3);
row3Cell3.setCellStyle(style);
//xxxxx
HSSFRow row5 = sheet.createRow(endRowIndex+1);
HSSFCell row5Cell0 = row5.createCell(0);
row5Cell0.setCellValue("合计");
row5Cell0.setCellStyle(style);
HSSFCell row5Cell1 = row5.createCell(1);
row5Cell1.setCellValue(new StringBuilder("xx").append(sumScore).append("xxx").toString());
row5Cell1.setCellStyle(songPoint14FontStyle);
HSSFCell row5Cell2 = row5.createCell(2);
row5Cell2.setCellStyle(songPoint14FontStyle);
HSSFCell row5Cell3 = row5.createCell(3);
row5Cell3.setCellStyle(songPoint14FontStyle);
//人员
HSSFRow row6 = sheet.createRow(endRowIndex+2);
HSSFCell row6Cell0 = row6.createCell(0);
row6Cell0.setCellValue("人员");
row6Cell0.setCellStyle(style);
StringBuilder tmpNames = new StringBuilder();
if (preParticipantNames.size() > 0){
preParticipantNames.forEach(item -> tmpNames.append(item).append(","));
}
HSSFCell row6Cell1 = row6.createCell(1);
row6Cell1.setCellValue(tmpNames.toString().length() > 0 ? (tmpNames.toString().substring(0,tmpNames.toString().length() -1)) : "");
row6Cell1.setCellStyle(style);
HSSFCell row6Cell2 = row6.createCell(2);
row6Cell2.setCellStyle(style);
HSSFCell row6Cell3 = row6.createCell(3);
row6Cell3.setCellStyle(style);
return wb;
代码里面的问题：
1、关于cell的style可以使用for循环来做，代码更加简洁；
2、每列的宽度没有做子适应展开，现在四列是用了固定值来设置列宽的。
3、...