最近碰到一个导出，比较繁琐，也查询了许多博客，在其中一篇博客的基础上修改，实现了最终想要的效果。话不多说，直接上效果图
上代码：
1.主代码：
List<Map<String, Object>> convertListMap = toListConvertListMap(tableTitleList, list);
// 第一步，创建一个Workbook，对应一个Excel文件
XSSFWorkbook wb = new XSSFWorkbook();
// 第二步，在Workbook中添加一个sheet,对应Excel文件中的sheet
XSSFSheet sheet = wb.createSheet("sheet");
// 第三步，设置样式以及字体样式
XSSFCellStyle titleStyle = createTitleCellStyle(wb);
XSSFCellStyle headerStyle = createHeadCellStyle(wb);
XSSFCellStyle contentStyle = createContentCellStyle(wb);
// 行号
int rowNum = 0;
// 创建第一页的第一行，索引从0开始
XSSFRow row0 = sheet.createRow(rowNum++);
row0.setHeight((short) 600);// 设置行高
sheet.setColumnWidth(2, 8000);
sheet.setColumnWidth(3, 8000);
//第二行
XSSFRow row2 = sheet.createRow(rowNum++);
row2.setHeight((short) 700);
// todo: 第三行
XSSFRow row3 = sheet.createRow(rowNum++);
row3.setHeight((short) 700);
String[] row_one = null;
String[] row_two = null;
String[] row_three = null;
int cellSize = 0;
if (tableTitleList.size() == 2) { // 全部
row_one = new String[]{"序号", "所属模块", "单位名称", "情况统计", "合计", "", "",
"测试类型A", "", "", "", "", "", "", "", "", "", "", "",
"测试类型B", "", "", "", "", "", "", "", "", "", "", "",};
row_two = new String[]{"", "", "", "", "合计A", "合计B", "合计C",
"测试类型A1", "", "", "",
"测试类型A2", "", "", "",
"测试类型A3", "", "", "",
"测试类型B1", "", "", "",
"测试类型B2", "", "", "",
"测试类型B3", "", "", ""};
row_three = new String[]{"", "", "", "", "", "", "",
"起床", "洗漱", "吃饭", "上班",
"起床", "洗漱", "吃饭", "上班",
"起床", "洗漱", "吃饭", "上班",
"起床", "洗漱", "吃饭", "上班",
"起床", "洗漱", "吃饭", "上班",
"起床", "洗漱", "吃饭", "上班",};
// 合并单元格
extracted(sheet);
}
// 创建第一行单元格
for (int i = 0; i < row_one.length; i++) {
XSSFCell c00 = row0.createCell(i);
c00.setCellValue(row_one[i]);
c00.setCellStyle(headerStyle);
}
// 创建第二行单元格
for (int i = 0; i < row_two.length; i++) {
XSSFCell tempCell = row2.createCell(i);
tempCell.setCellValue(row_two[i]);
tempCell.setCellStyle(headerStyle);
}
// 创建第三行单元格
for (int i = 0; i < row_three.length; i++) {
XSSFCell tempCell = row3.createCell(i);
tempCell.setCellValue(row_three[i]);
tempCell.setCellStyle(headerStyle);
}
// 设置表头单元格的宽度
tableTitleStyleColumnwidth(sheet);
// todo： 填充数据
approvalMethodfillInData(convertListMap, sheet, contentStyle, rowNum, row_three, tableTitleList);
// approvalMethodfillInData(convertListMap, sheet, contentStyle, rowNum, cellSize, tableTitleList);
//导出到浏览器下载
buildExcelDocument("监测数据.xlsx", wb, response);2.合并单元格
private static void extracted(XSSFSheet sheet) {
// todo: 合并参数分别为： 起始行，结束行，起始列，结束列
// 将第一列 的 第一行到第三行合并
sheet.addMergedRegion(new CellRangeAddress(0, 2, 0, 0));
// 将第二列的 第一行到第三行合并
sheet.addMergedRegion(new CellRangeAddress(0, 2, 1, 1));
// 将第三列的 第一行到第三行合并
sheet.addMergedRegion(new CellRangeAddress(0, 2, 2, 2));
sheet.addMergedRegion(new CellRangeAddress(0, 2, 3, 3));
// 合计
sheet.addMergedRegion(new CellRangeAddress(0, 0, 4, 6));
// 合计下的单元格
sheet.addMergedRegion(new CellRangeAddress(1, 2, 4, 4));
sheet.addMergedRegion(new CellRangeAddress(1, 2, 5, 5));
sheet.addMergedRegion(new CellRangeAddress(1, 2, 6, 6));
sheet.addMergedRegion(new CellRangeAddress(0, 0, 7, 18));
sheet.addMergedRegion(new CellRangeAddress(0, 0, 19, 30));
sheet.addMergedRegion(new CellRangeAddress(1, 1, 7, 10));
sheet.addMergedRegion(new CellRangeAddress(1, 1, 11, 14));
sheet.addMergedRegion(new CellRangeAddress(1, 1, 15, 18));
sheet.addMergedRegion(new CellRangeAddress(1, 1, 19, 22));
sheet.addMergedRegion(new CellRangeAddress(1, 1, 23, 26));
sheet.addMergedRegion(new CellRangeAddress(1, 1, 27, 30));
}3.设置表头单元格的宽度
private static void tableTitleStyleColumnwidth(XSSFSheet sheet) {
sheet.setColumnWidth(2, 8000);
sheet.setColumnWidth(3, 8000);
sheet.setColumnWidth(7, 3000);
sheet.setColumnWidth(8, 3000);
sheet.setColumnWidth(9, 3000);
sheet.setColumnWidth(10, 3000);
sheet.setColumnWidth(11, 3000);
sheet.setColumnWidth(12, 3000);
sheet.setColumnWidth(13, 3000);
sheet.setColumnWidth(14, 3000);
sheet.setColumnWidth(15, 3000);
sheet.setColumnWidth(16, 3000);
sheet.setColumnWidth(17, 3000);
sheet.setColumnWidth(18, 3000);
sheet.setColumnWidth(19, 3000);
sheet.setColumnWidth(20, 3000);
sheet.setColumnWidth(21, 3000);
sheet.setColumnWidth(22, 3000);
sheet.setColumnWidth(23, 3000);
sheet.setColumnWidth(24, 3000);
sheet.setColumnWidth(25, 3000);
sheet.setColumnWidth(26, 3000);
sheet.setColumnWidth(27, 3000);
sheet.setColumnWidth(28, 3000);
sheet.setColumnWidth(29, 3000);
sheet.setColumnWidth(30, 3000);
}4.填充数据（注：我这里的数据格式是List<Map<String, Object>>类型，可以根据自己的实际情况来封装数据）
private static void approvalMethodfillInData(List<Map<String, Object>> convertListMap, XSSFSheet sheet, XSSFCellStyle contentStyle, int rowNum, String[] cellSize, List<Object> tableTitleList) {
for (Map<String, Object> map : convertListMap) {
XSSFRow tempRow = sheet.createRow(rowNum++);
tempRow.setHeight((short) 500);
// 判断选择类型
if (tableTitleList.size() == 2 || "enterprise".equals(tableTitleList.get(0).toString())) {
// 循环单元格填入数据
for (int i = 0; i < cellSize.length; i++) {
//列宽自适应，j为自适应的列，true就是自适应，false就是不自适应，默认不自适应
sheet.autoSizeColumn(i, true);
XSSFCell tempCell = tempRow.createCell(i);
tempCell.setCellStyle(contentStyle);
String tempValue = "";
switch (i) {
case 0:
tempValue = map.get("indexNum").toString();
break;
case 1:
tempValue = map.get("platName").toString();
break;
case 2:
tempValue = map.get("deptName").toString();
break;
case 3:
tempValue = map.get("type").toString();
break;
case 4:
tempValue = map.get("totalProNum").toString();
break;
case 5:
tempValue = map.get("totalBidNum").toString();
break;
case 6:
tempValue = map.get("totalAmount").toString();
break;
case 7:
tempValue = map.get("enterpriseEngineeringProNum").toString();
break;
case 8:
tempValue = map.get("enterpriseEngineeringBidNum").toString();
break;
case 9:
tempValue = map.get("enterprisePurchaseAmount").toString();
break;
case 10:
tempValue = map.get("planEnterprisePurchaseAmount").toString();
break;
case 11:
tempValue = map.get("enterprisePurchaseProNum").toString();
break;
case 12:
tempValue = map.get("enterprisePurchaseBidNum").toString();
break;
case 13:
tempValue = map.get("enterprisePurchaseAmount").toString();
break;
case 14:
tempValue = map.get("planEnterprisePurchaseAmount").toString();
break;
case 15:
tempValue = map.get("enterpriseServiceProNum").toString();
break;
case 16:
tempValue = map.get("enterpriseServiceBidNum").toString();
break;
case 17:
tempValue = map.get("enterpriseServiceAmount").toString();
break;
case 18:
tempValue = map.get("planEnterpriseServiceAmount").toString();
break;
case 19:
tempValue = map.get("groupEngineeringProNum").toString();
break;
case 20:
tempValue = map.get("grouppurchaseBidNum").toString();
break;
case 21:
tempValue = map.get("groupPurchaseAmount").toString();
break;
case 22:
tempValue = map.get("palnGroupPurchaseAmount").toString();
break;
case 23:
tempValue = map.get("groupPurchaseProNum").toString();
break;
case 24:
tempValue = map.get("groupEngineeringBidNum").toString();
break;
case 25:
tempValue = map.get("groupEngineeringAmount").toString();
break;
case 26:
tempValue = map.get("planGroupEngineeringAmount").toString();
break;
case 27:
tempValue = map.get("groupServiceProNum").toString();
break;
case 28:
tempValue = map.get("groupServiceBidNum").toString();
break;
case 29:
tempValue = map.get("groupServiceAmount").toString();
break;
case 30:
tempValue = map.get("planGroupServiceAmount").toString();
break;
}
tempCell.setCellValue(tempValue);
}
}
}5.web下载，导出到浏览器
private static void buildExcelDocument(String fileName, Workbook wb, HttpServletResponse response) {
try {
response.setContentType("application/octet-stream");
// 可自行定义编码格式
response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "utf-8"));
//清除jsp编译html文件的空白,防止excel出现空行
response.flushBuffer();
//写出
wb.write(response.getOutputStream());
} catch (IOException e) {
e.printStackTrace();
} finally {
IOUtils.closeQuietly(wb);
}
}6.提供表头样式，内容样式以及标题样式
/**
* 创建标题样式
*
* @param wb
* @return
*/
private static XSSFCellStyle createTitleCellStyle(XSSFWorkbook wb) {
XSSFCellStyle cellStyle = wb.createCellStyle();
cellStyle.setAlignment(HorizontalAlignment.CENTER);//水平居中
cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);//垂直对齐
cellStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);
// cellStyle.setFillForegroundColor(IndexedColors.GREY_40_PERCENT.getIndex());//背景颜色
XSSFFont headerFont1 = (XSSFFont) wb.createFont(); // 创建字体样式
headerFont1.setBold(true); //字体加粗
headerFont1.setFontName("黑体"); // 设置字体类型
headerFont1.setFontHeightInPoints((short) 15); // 设置字体大小
cellStyle.setFont(headerFont1); // 为标题样式设置字体样式
return cellStyle;
}
/**
* 创建表头样式
*
* @param wb
* @return
*/
private static XSSFCellStyle createHeadCellStyle(XSSFWorkbook wb) {
XSSFCellStyle cellStyle = wb.createCellStyle();
cellStyle.setWrapText(true);// 设置自动换行
cellStyle.setFillForegroundColor(IndexedColors.GREY_25_PERCENT.getIndex());//背景颜色
cellStyle.setAlignment(HorizontalAlignment.CENTER); //水平居中
cellStyle.setVerticalAlignment(VerticalAlignment.CENTER); //垂直对齐
cellStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);
// cellStyle.setBottomBorderColor(IndexedColors.BLACK.index);
cellStyle.setBorderBottom(BorderStyle.THIN); //下边框
cellStyle.setBorderLeft(BorderStyle.THIN); //左边框
cellStyle.setBorderRight(BorderStyle.THIN); //右边框
cellStyle.setBorderTop(BorderStyle.THIN); //上边框
XSSFFont headerFont = (XSSFFont) wb.createFont(); // 创建字体样式
headerFont.setBold(true); //字体加粗
headerFont.setFontName("黑体"); // 设置字体类型
headerFont.setFontHeightInPoints((short) 12); // 设置字体大小
cellStyle.setFont(headerFont); // 为标题样式设置字体样式
return cellStyle;
}
/**
* 创建内容样式
*
* @param wb
* @return
*/
private static XSSFCellStyle createContentCellStyle(XSSFWorkbook wb) {
XSSFCellStyle cellStyle = wb.createCellStyle();
cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);// 垂直居中
cellStyle.setAlignment(HorizontalAlignment.CENTER);// 水平居中
cellStyle.setWrapText(true);// 设置自动换行
cellStyle.setBorderBottom(BorderStyle.THIN); //下边框
cellStyle.setBorderLeft(BorderStyle.THIN); //左边框
cellStyle.setBorderRight(BorderStyle.THIN); //右边框
cellStyle.setBorderTop(BorderStyle.THIN); //上边框
// 生成12号字体
XSSFFont font = wb.createFont();
font.setColor((short) 8);
font.setFontHeightInPoints((short) 12);
cellStyle.setFont(font);
return cellStyle;
}到此，大功告成！如果有好的实现方法，欢迎交流！！！
参考博客：java导出功能（多级表头，复杂表头）_java导出excel复杂表头_IT行业小趴菜的博客-CSDN博客
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原文链接：https://blog.csdn.net/weixin_45620445/article/details/132251538
