用POI实现双层标题excel打印

/** 带分类标题导出Excel的方法
	  * 
	  * @param title
	  *            excel中的sheet名称
	  * @param header_2
	  *            两列的头的标题
	  * @param header_cate
	  *            分类列
	  * @param cate_num
	  *            分类列行数
	  * @param header_1
	  *            分类列行数
	  * @param columns
	  * 			   列名
	  * @param result
	  *            结果集
	  * @param out
	  *            输出流
	  * @param pattern
	  *            时间格式
	  */ 
	@SuppressWarnings("deprecation") 
	public void exportoExcel1(String title, String[] header_2, String[] header_cate, int[] cate_num, String[] header_1, String[] columns, Collection<T> result, OutputStream out,
			String pattern) throws Exception {

		// 声明一个工作薄
		HSSFWorkbook workbook = new HSSFWorkbook();
		// 生成一个表格
		HSSFSheet sheet = workbook.createSheet(title);
		// 设置表格默认列宽度为20个字节
		sheet.setDefaultColumnWidth((short) 20);

		// 生成一个样式
		HSSFCellStyle style = workbook.createCellStyle();
		// 设置单元格背景色，设置单元格背景色以下两句必须同时设置
		style.setFillForegroundColor(HSSFColor.GREY_25_PERCENT.index); // 设置填充色
		style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);// 设置填充样式   

		 // 设置单元格上、下、左、右的边框线
		style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
		style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
		style.setBorderRight(HSSFCellStyle.BORDER_THIN);
		style.setBorderTop(HSSFCellStyle.BORDER_THIN);
		// 设置居中
		style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
		// 生成一个字体
		HSSFFont font = workbook.createFont();
		font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
		// 把字体应用到当前的样式
		style.setFont(font);

		// 指定当单元格内容显示不下时自动换行
		style.setWrapText(true);

		// 声明一个画图的顶级管理器
		HSSFPatriarch patriarch = sheet.createDrawingPatriarch();

		// 以下可以用于设置导出的数据的样式
		// 产生表格标题行
		// 表头的样式
		HSSFCellStyle titleStyle = workbook.createCellStyle();// 创建样式对象
		titleStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER_SELECTION);// 水平居中
		titleStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);// 垂直居中
		// 设置字体
		HSSFFont titleFont = workbook.createFont(); // 创建字体对象
		titleFont.setFontHeightInPoints((short) 15); // 设置字体大小
		titleFont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);// 设置粗体
		// titleFont.setFontName("黑体"); // 设置为黑体字
		titleStyle.setFont(titleFont);
		//第一行
		CellRangeAddress cra=new CellRangeAddress(0, (short) 0, 0, (short) (columns.length - 1));//参数:起始行号，终止行号， 起始列号，终止列号
		sheet.addMergedRegion(cra);
		
		Row row = sheet.createRow(0);
		Cell row0=row.createCell(0);
		row0.setCellValue(title);
		row0.setCellStyle(titleStyle);
		
		for(int i=0; i<header_2.length; i++){
			cra=new CellRangeAddress(1, 2, i, i);
			sheet.addMergedRegion(cra);
		}
		int sum1 = 0;
		int sum2 = 0;
		for(int i=0; i<header_cate.length; i++){
			sum1 += cate_num[i];
			cra=new CellRangeAddress(1, 1, 1+sum2, sum1);	//
			sheet.addMergedRegion(cra);
			sum2 += cate_num[i];
		}
		
		row = sheet.createRow(1);
		
		for(int i=0; i<header_2.length; i++){
			final Cell cell = row.createCell(i);
			cell.setCellStyle(style);	
			cell.setCellValue(header_2[i]);
		}
		
		int sum = 0;
		for(int i=0; i<header_cate.length; i++){
			final Cell cell = row.createCell(1+sum);	//
			cell.setCellStyle(style);
			cell.setCellValue(header_cate[i]);
			sum += cate_num[i];
		}
		row = sheet.createRow(2);
		for(int i=0; i<header_1.length; i++){
			final Cell cell = row.createCell(i+1);	//
			cell.setCellStyle(style);
			cell.setCellValue(header_1[i]);
		}
		
		// 遍历集合数据，产生数据行
		if (result != null) {
			int index = 3;
			for (T t : result) {
				row = sheet.createRow(index);
				index++;
				for (short i = 0; i < columns.length; i++) {
					Cell cell = row.createCell(i);
					String fieldName = columns[i];
					String getMethodName = "get" + fieldName.substring(0, 1).toUpperCase() + fieldName.substring(1);
					Class tCls = t.getClass();
					Method getMethod = tCls.getMethod(getMethodName, new Class[] {});
					Object value = getMethod.invoke(t, new Class[] {});
					String textValue = null;
					if (value == null) {
						textValue = "";
					} else if (value instanceof Date) {
						Date date = (Date) value;
						SimpleDateFormat sdf = new SimpleDateFormat(pattern);
						textValue = sdf.format(date);
					} else if (value instanceof byte[]) {
						// 有图片时，设置行高为60px;
						row.setHeightInPoints(60);
						// 设置图片所在列宽度为80px,注意这里单位的一个换算
						sheet.setColumnWidth(i, (short) (35.7 * 80));
						// sheet.autoSizeColumn(i);
						byte[] bsValue = (byte[]) value;
						HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0, 1023, 255, (short) 6, index, (short) 6,
								index);
						anchor.setAnchorType(2);
						patriarch.createPicture(anchor, workbook.addPicture(bsValue, HSSFWorkbook.PICTURE_TYPE_JPEG));
					} else {
						// 其它数据类型都当作字符串简单处理
						textValue = value.toString();
					}
					if (textValue != null) {
						Pattern p = Pattern.compile("^//d+(//.//d+)?$");
						Matcher matcher = p.matcher(textValue);
						if (matcher.matches()) {
							// 是数字当作double处理
							cell.setCellValue(Double.parseDouble(textValue));
						} else {
							HSSFRichTextString richString = new HSSFRichTextString(textValue);
							cell.setCellValue(richString);
						}
					}
				}
			}
		}
		workbook.write(out);
		out.flush();
		out.close();
	}

@RequestMapping(InterfaceConsts.EXPORT_MONTHTESTRSTLIST)
	@ResponseBody
	public void export_MonthTestrstList(HttpServletRequest request, WqTestrstDForm form,
			String jsonpCallback, HttpServletResponse response) throws Exception{
		Map<String, Object> params = new HashMap<String, Object>();
		params = MapUtil.toMap(form);
		
		response.setContentType("application/vnd.ms-excel;charset=utf-8");
		OutputStream out = response.getOutputStream();
		SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM");
		String title = sdf.format(new Date(form.getTimeStart().replaceAll("-", "/")))+wqPrjBService.getWqPrjBBySmid(Integer.valueOf(form.getSmid())).getPrjnm()+"水质监测月报表";
		
		String[] header_2={"检测项目"};
		int[] cate_num={5,5,4};
		String[] header_cate={"源水","出厂水","末梢水"};
		String[] headers = { "原水检验次数", "原水最大值", "原水最小值", "原水平均值", "出厂水检验次数", "出厂水最大值", "出厂水最小值", "出厂水平均值", "出厂水标准值", "出厂水检验次数", "管网末梢水最大值", "管网末梢水最小值", "管网末梢水平均值", "管网末梢水标准值"};
		String[] columns = { "itmnm", "count01", "tstv01Max", "tstv01Min", "tstv01Avg", "count02", "tstv02Max", "tstv02Min", "tstv02Avg", "ostnv", "count03", "tstv03Max", "tstv03Min", "tstv03Avg", "estnv"};
		List<WqTestrstDMonth> houseList = wqTestrstDService.getAllMonthTestrstList(params);//我的数据源
		ExcelUitl<WqTestrstDMonth> excelUtil = new ExcelUitl<WqTestrstDMonth>();
		String pattern = "yyyy-MM-dd HH:mm:dd";
		response.setHeader("Content-Disposition", "attachment;filename=" + new String((title + ".xls").getBytes(), "iso-8859-1"));
		excelUtil.exportoExcel1(title, header_2, header_cate, cate_num, headers, columns, houseList, out, pattern);
	}