效果图：
controller层方法：
/**
*
* 导出Excel报表
* @param request
* @return
*
*/
@RequestMapping("/export")
@ResponseBody
public void export(HttpServletRequest request,
HttpServletResponse response, String yearMonth) {
try {
SimpleDateFormat dateFmt = new SimpleDateFormat("yyyy-MM-dd");
Map<String, Object> params = new HashMap<String, Object>();
params.put("yearMonth", yearMonth + "%");
List<TemperHumidityModel> list = temperHumidityService
.getList(params);
for (int i = 0; i < list.size(); i++) {
Date date = list.get(i).getRecordDate();
String dateStr = dateFmt.format(date);
dateStr = dateStr.replace(yearMonth + "-", "");
list.get(i).setRecordDay(dateStr);
}
Map<Integer, String> map = new HashMap<Integer, String>();
map.put(1, "晴");
map.put(2, "多云");
map.put(3, "阴");
map.put(4, "小雨");
map.put(5, "中雨");
map.put(6, "大雨");
map.put(7, "大到暴雨");
map.put(8, "雾");
map.put(9, "霾");
// 构造导出数据
List<Map<String, Object>> dataList = new ArrayList<Map<String, Object>>();
for (int i = 0; i < list.size(); i++) {
TemperHumidityModel model = list.get(i);
Map<String, Object> tmpMap = new HashMap<String, Object>();
tmpMap.put("date", model.getRecordDay());
if(model.getWeather() == 1) {
tmpMap.put("weather", map.get(1));
}else if(model.getWeather() == 2) {
tmpMap.put("weather", map.get(2));
}else if(model.getWeather() == 3) {
tmpMap.put("weather", map.get(3));
}else if(model.getWeather() == 4) {
tmpMap.put("weather", map.get(4));
}else if(model.getWeather() == 5) {
tmpMap.put("weather", map.get(5));
}else if(model.getWeather() == 6) {
tmpMap.put("weather", map.get(6));
}else if(model.getWeather() == 7) {
tmpMap.put("weather", map.get(7));
}else if(model.getWeather() == 8) {
tmpMap.put("weather", map.get(8));
}else if(model.getWeather() == 9) {
tmpMap.put("weather", map.get(9));
}
tmpMap.put("natureTem", model.getNatureTem());
tmpMap.put("natureHum", model.getNatureHum());
tmpMap.put("adjustTem", model.getAdjustTem());
tmpMap.put("adjustHum", model.getAdjustHum());
tmpMap.put("remark", model.getRemark());
tmpMap.put("creator", model.getRealname());
dataList.add(tmpMap);
}
String sheetName = "温湿度日记录";
String date = yearMonth;
String[] head0 = new String[] { "日期", "天气", "自然", "自然", "调整", "调整",
"备注", "记录人" }; //在excel中的第3行每列的参数
String[] head1 = new String[] { "温度℃", "湿度%", "温度℃", "湿度%" }; //在excel中的第4行每列（合并列）的参数
String[] headnum0 = new String[] { "2,3,0,0", "2,3,1,1", "2,2,2,3",
"2,2,4,5", "2,3,6,6", "2,3,7,7" }; //对应excel中的行和列，下表从0开始{"开始行,结束行,开始列,结束列"}
String[] headnum1 = new String[] { "3,3,2,2", "3,3,3,3", "3,3,4,4",
"3,3,5,5" };
String[] colName = new String[] { "date", "weather", "natureTem",
"natureHum", "adjustTem", "adjustHum", "remark", "creator" }; //需要显示在excel中的参数对应的值，因为是用map存的，放的都是对应的key
reportMergeXls(request, response, dataList, sheetName, head0,
headnum0, head1, headnum1, colName, date); //utils类需要用到的参数
} catch (Exception e) {
e.printStackTrace();
}
}
utils类：
package org.base.controller;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.CellRangeAddress;
import org.base.util.CellUtil;
import org.core.controller.BaseController;
/**
* 多行表头
* dataList：导出的数据；sheetName：表头名称； head0：表头第一行列名；headnum0：第一行合并单元格的参数
* head1：表头第二行列名；headnum1：第二行合并单元格的参数；detail：导出的表体字段
*
*/
public void reportMergeXls(HttpServletRequest request,
HttpServletResponse response, List<Map<String, Object>> dataList,
String sheetName, String[] head0, String[] headnum0,
String[] head1, String[] headnum1, String[] detail , String date)
throws Exception {
HSSFWorkbook workbook = new HSSFWorkbook();
HSSFSheet sheet = workbook.createSheet(sheetName);// 创建一个表
// 表头标题样式
HSSFFont headfont = workbook.createFont();
headfont.setFontName("宋体");
headfont.setFontHeightInPoints((short) 22);// 字体大小
HSSFCellStyle headstyle = workbook.createCellStyle();
headstyle.setFont(headfont);
headstyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);// 左右居中
headstyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);// 上下居中
headstyle.setLocked(true);
// 表头时间样式
HSSFFont datefont = workbook.createFont();
datefont.setFontName("宋体");
datefont.setFontHeightInPoints((short) 12);// 字体大小
HSSFCellStyle datestyle = workbook.createCellStyle();
datestyle.setFont(datefont);
datestyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);// 左右居中
datestyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);// 上下居中
datestyle.setLocked(true);
// 列名样式
HSSFFont font = workbook.createFont();
font.setFontName("宋体");
font.setFontHeightInPoints((short) 12);// 字体大小
HSSFCellStyle style = workbook.createCellStyle();
style.setBorderBottom(HSSFCellStyle.BORDER_THIN); //下边框
style.setBorderLeft(HSSFCellStyle.BORDER_THIN);//左边框
style.setBorderTop(HSSFCellStyle.BORDER_THIN);//上边框
style.setBorderRight(HSSFCellStyle.BORDER_THIN);//右边框
style.setFont(font);
style.setAlignment(HSSFCellStyle.ALIGN_CENTER);// 左右居中
style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);// 上下居中
style.setLocked(true);
// 普通单元格样式（中文）
HSSFFont font2 = workbook.createFont();
font2.setFontName("宋体");
font2.setFontHeightInPoints((short) 12);
HSSFCellStyle style2 = workbook.createCellStyle();
style2.setBorderBottom(HSSFCellStyle.BORDER_THIN); //下边框
style2.setBorderLeft(HSSFCellStyle.BORDER_THIN);//左边框
style2.setBorderTop(HSSFCellStyle.BORDER_THIN);//上边框
style2.setBorderRight(HSSFCellStyle.BORDER_THIN);//右边框
style2.setFont(font2);
style2.setAlignment(HSSFCellStyle.ALIGN_CENTER);// 左右居中
style2.setWrapText(true); // 换行
style2.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);// 上下居中
// 设置列宽 （第几列，宽度）
sheet.setColumnWidth( 0, 1600);
sheet.setColumnWidth( 1, 3600);
sheet.setColumnWidth( 2, 2800);
sheet.setColumnWidth( 3, 2800);
sheet.setColumnWidth( 4, 2800);
sheet.setColumnWidth( 5, 2800);
sheet.setColumnWidth( 6, 4500);
sheet.setColumnWidth( 7, 3600);
sheet.setDefaultRowHeight((short)360);//设置行高
// 第一行表头标题
sheet.addMergedRegion(new CellRangeAddress(0, 0, 0, head0.length-1));
HSSFRow row = sheet.createRow(0);
row.setHeight((short) 0x349);
HSSFCell cell = row.createCell(0);
cell.setCellStyle(headstyle);
CellUtil.setCellValue(cell, sheetName);
// 第二行时间
sheet.addMergedRegion(new CellRangeAddress(1, 1, 0, head0.length-1));
HSSFRow row1 = sheet.createRow(1);
row.setHeight((short) 0x349);
HSSFCell cell1 = row1.createCell(0);
cell1.setCellStyle(datestyle);
CellUtil.setCellValue(cell1, date);
// 第三行表头列名
row = sheet.createRow(2);
for (int i = 0; i < 8; i++) {
cell = row.createCell(i);
cell.setCellValue(head0[i]);
cell.setCellStyle(style);
}
//动态合并单元格
for (int i = 0; i < headnum0.length; i++) {
String[] temp = headnum0[i].split(",");
Integer startrow = Integer.parseInt(temp[0]);
Integer overrow = Integer.parseInt(temp[1]);
Integer startcol = Integer.parseInt(temp[2]);
Integer overcol = Integer.parseInt(temp[3]);
sheet.addMergedRegion(new CellRangeAddress(startrow, overrow,
startcol, overcol));
}
//设置合并单元格的参数并初始化带边框的表头（这样做可以避免因为合并单元格后有的单元格的边框显示不出来）
row = sheet.createRow(3); //因为下标从0开始，所以这里表示的是excel中的第四行
for (int i = 0; i < head0.length; i++) {
cell = row.createCell(i);
cell.setCellStyle(style); //设置excel中第四行的1、2、7、8列的边框
if(i > 1 && i< 6) {
for (int j = 0; j < head1.length; j++) {
cell = row.createCell(j + 2);
cell.setCellValue(head1[j]); //给excel中第四行的3、4、5、6列赋值（"温度℃", "湿度%", "温度℃", "湿度%"）
cell.setCellStyle(style); //设置excel中第四行的3、4、5、6列的边框
}
}
}
//动态合并单元格
for (int i = 0; i < headnum1.length; i++) {
String[] temp = headnum1[i].split(",");
Integer startrow = Integer.parseInt(temp[0]);
Integer overrow = Integer.parseInt(temp[1]);
Integer startcol = Integer.parseInt(temp[2]);
Integer overcol = Integer.parseInt(temp[3]);
sheet.addMergedRegion(new CellRangeAddress(startrow, overrow,
startcol, overcol));
}
// 设置列值-内容
for (int i = 0; i < dataList.size(); i++) {
row = sheet.createRow(i + 2 + dataList.size());
for (int j = 0; j < detail.length; j++) {
Map tempmap = (HashMap) dataList.get(i);
Object data = tempmap.get(detail[j]);
cell = row.createCell(j);
cell.setCellStyle(style2);
cell.setCellType(HSSFCell.CELL_TYPE_STRING);
CellUtil.setCellValue(cell, data);
}
}
String fileName = new String(sheetName.getBytes("gb2312"), "ISO8859-1");
ByteArrayOutputStream baos = new ByteArrayOutputStream();
workbook.write(baos);
response.setContentType("application/x-download;charset=utf-8");
response.addHeader("Content-Disposition", "attachment;filename="
+ fileName + ".xls");
OutputStream os = response.getOutputStream();
ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
byte[] b = new byte[1024];
while ((bais.read(b)) > 0) {
os.write(b);
}
bais.close();
os.flush();
os.close();
}