poi 3 층 표두

		// TODO Auto-generated method stub
		FileOutputStream fileOut = null;
		File file = new File("c:/1.xls");
		String[] header = { "    ", "IP  ", " cache   _   ", " cache   _   ",
				"   _   ", "   _   ", "   _   ", "   _   ", "session _   ",
				"session _   ", "   _   ", "   _   ", "     _   ", "     _   ",
				"      _   ", "      _   ", "   _   _   ", "   _   _   ",
				"   _    _   ", "   _    _   ", "   _   _   ", "   _   _   ",
				"   _    _   ", "   _    _   ", "   _   _   ", "   _   _   ",
				"    " };
		try {
			HSSFWorkbook wb = new HSSFWorkbook();
			HSSFSheet sheet = wb.createSheet("new sheet");
			HSSFFont fontinfo = wb.createFont();
			fontinfo.setFontHeightInPoints((short) 8); //     
			HSSFFont fonthead = wb.createFont();
			fonthead.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);//   
			HSSFCellStyle cellStylename = wb.createCellStyle();//     
			cellStylename.setFont(fonthead);
			HSSFCellStyle cellStyleinfo = wb.createCellStyle();//      
			cellStyleinfo.setAlignment(HSSFCellStyle.ALIGN_RIGHT);//   
			cellStyleinfo.setFont(fontinfo);
			HSSFCellStyle cellStylehead = wb.createCellStyle();//     
			cellStylehead.setFont(fonthead);
			cellStylehead.setAlignment(HSSFCellStyle.ALIGN_CENTER);
			cellStylehead.setBorderBottom(HSSFCellStyle.BORDER_THIN);//   
			cellStylehead.setBottomBorderColor(HSSFColor.BLACK.index);
			cellStylehead.setBorderLeft(HSSFCellStyle.BORDER_THIN);
			cellStylehead.setLeftBorderColor(HSSFColor.BLACK.index);
			cellStylehead.setBorderRight(HSSFCellStyle.BORDER_THIN);
			cellStylehead.setRightBorderColor(HSSFColor.BLACK.index);
			cellStylehead.setBorderTop(HSSFCellStyle.BORDER_THIN);
			cellStylehead.setTopBorderColor(HSSFColor.BLACK.index);
			cellStylehead.setFillForegroundColor(HSSFColor.ORANGE.index);
			cellStylehead.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
			HSSFCellStyle cellStyle = wb.createCellStyle();//       
			cellStyle.setWrapText(true);//     
			cellStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);
			cellStyle.setBottomBorderColor(HSSFColor.BLACK.index);
			cellStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);
			cellStyle.setLeftBorderColor(HSSFColor.BLACK.index);
			cellStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);
			cellStyle.setRightBorderColor(HSSFColor.BLACK.index);
			cellStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);
			cellStyle.setTopBorderColor(HSSFColor.BLACK.index);
			
			int col = header.length;
			HSSFRow row = sheet.createRow((short) 0);
			HSSFCell cell = row.createCell((short) 0);
			cell.setEncoding(HSSFCell.ENCODING_UTF_16);
			cell.setCellStyle(cellStylename);
			cell.setCellValue("oracle");//   
			sheet.addMergedRegion(new Region(0, (short) 0, 0, (short) 1));

			cell = row.createCell((short) 2);
			cell.setEncoding(HSSFCell.ENCODING_UTF_16);
			cell.setCellStyle(cellStyleinfo);
			cell.setCellValue("oracle"); //   
			sheet.addMergedRegion(new Region(0, (short) 2, 0, (short) col));

			int rows_max = 0;
			for (int i = 0; i < header.length; i++) {
				String h = header[i];
				if (h.split("_").length > rows_max) {
					rows_max = h.split("_").length;
				}
			}
			Map map = new HashMap();
			for (int k = 0; k < rows_max; k++) {
				row = sheet.createRow((short) k + 1);
				if (k == 0) {
					cell = row.createCell((short) (0));
					cell.setEncoding(HSSFCell.ENCODING_UTF_16);
					cell.setCellStyle(cellStylehead);
					cell.setCellValue("  ");
					sheet.addMergedRegion(new Region(k + 1, (short) 0, k
							+ rows_max, (short) 0));
				}
				for (int i = 0; i < header.length; i++) {
					String headerTemp = header[i];
					String[] s = headerTemp.split("_");
					String sk = "";
					int num = i + 1;
					if (s.length == 1) {
						cell = row.createCell((short) (num));
						cell.setEncoding(HSSFCell.ENCODING_UTF_16);
						cell.setCellStyle(cellStylehead);
						sheet.addMergedRegion(new Region(1, (short) (num),
								rows_max, (short) (num)));
						sk = headerTemp;
						cell.setCellValue(sk);
					} else {
						System.out.println(sk);
						
						cell = row.createCell((short) (num));
						cell.setEncoding(HSSFCell.ENCODING_UTF_16);
						cell.setCellStyle(cellStylehead);
						int cols = 0;
						if (map.containsKey(headerTemp)) {
							continue;
						}
						for (int d = 0; d <= k; d++) {
							if (d != k) {
								sk += s[d] + "_";
							} else{
								sk += s[d];
							}
						}
						if(map.containsKey(sk)){
							continue;
						}
						for (int j = 0; j < header.length; j++) {
							if (header[j].indexOf(sk) != -1) {
								cols++;
							}
						}
						cell.setCellValue(s[k]);
						sheet
								.addMergedRegion(new Region(k + 1,
										(short) num, k + 1,
										(short) (num + cols-1)));
						if (sk.equals(headerTemp)) {
							sheet.addMergedRegion(new Region(k + 1,
									(short) num, k + 1 + rows_max
											- s.length, (short) num));
						}
					}
					if (s.length > k) {
						if (!map.containsKey(sk)) {
							String key = "";
							if (k > 0) {
								key = sk;
							} else {
								key = s[k];
							}
							map.put(key, null);
						}
					}
				}
			}
			fileOut = new FileOutputStream(file);
			// modify by xywang(2007-11-19) end
			wb.write(fileOut);
		} catch (Exception e) {
			e.printStackTrace();
		}