在jsp中:

<button onclick="download()" class="btn btn-warning " type="button">批量匯出Excel <i class="fa fa-download"></i></button>
<script type="text/javascript">
//匯出資訊函式
		function download(){
			if(confirm("是否要匯出資料?")){
				var url = "${path}/master/child/downloadChild";
				$.post(url,function(data){
					alert(data.message);
				});
			}
		}
</script>
MasterChildController.java:
@RequestMapping(value = "downloadChild", method = RequestMethod.POST)
	@ResponseBody
	public Map<String, Object> downloadChild() throws Exception {
		Date date = new Date();
		DateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmssSSS"); 
		String fileName = sdf.format(date);
		//得到桌面路徑
		File desktopDir = FileSystemView.getFileSystemView().getHomeDirectory();
		String desktopPath = desktopDir.getAbsolutePath();
		String desktopDirPath = desktopPath.replace("\\","\\\\");
		String filePath = desktopDirPath + "\\\\" +fileName + ".xls";
		//System.out.println(filePath);
		String[] titles = {"年級班級名稱","幼兒學號","姓名","性別","年齡","出生日期","新增幼兒時間","刪除標誌","父親姓名","父親電話","父親工作單位","母親姓名","母親電話","母親工作單位","家庭住址","備註"};
		Map<String, Object> params = new HashMap<String, Object>();
		List<Child> listsChild = childService.queryAll(params);
		Grades grades = new Grades();
		SimpleDateFormat dateFormater = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
 		List<Map<Integer, String>> lists = new ArrayList<Map<Integer,String>>();
		for (int i = 0; i < listsChild.size(); i++) {
			Child child =  listsChild.get(i);
			Map<Integer, String> paramsLists = new HashMap<Integer, String>();
			//通過child.getGradesId()來查詢班級名稱
			grades = gradesService.queryBean(child.getGradesId());
			paramsLists.put(0, grades.getGradesName());
			paramsLists.put(1, child.getChildNo());
			paramsLists.put(2, child.getChildName());
			paramsLists.put(3, child.getSex());
			paramsLists.put(4, child.getAge().toString());
			paramsLists.put(5, child.getBrithDay());
			//格式化新增幼兒時間
			paramsLists.put(6, dateFormater.format(child.getAddDate()));
			paramsLists.put(7, child.getDr());
			paramsLists.put(8, child.getFatherName());
			paramsLists.put(9, child.getFatherPhone());
			paramsLists.put(10, child.getFatherWork());
			paramsLists.put(11, child.getMotherName());
			paramsLists.put(12, child.getMotherPhone());
			paramsLists.put(13, child.getMotherWork());
			paramsLists.put(14, child.getAddress());
			paramsLists.put(15, child.getComments());
			lists.add(paramsLists);
		}
		ExcelUtil.writeExcel(filePath, titles, lists);
		Map<String,Object> json = new HashMap<String, Object>();
		json.put("message", "匯出Excel檔案到桌面,檔名為:" + fileName + ".xls");
		return json;
	}
ExcelUtil.java  對Excel操作的工具類。
public class ExcelUtil {
	/**
	 * @info 寫出Excel標題
	 * @param fos
	 * @return
	 */
	public static void writeExcelTitle(String filePath, String[] ss)
			throws IOException {
		OutputStream fos = new FileOutputStream(filePath);
		HSSFWorkbook xls = new HSSFWorkbook();
		HSSFSheet sheet = xls.createSheet();
		HSSFRow row = sheet.createRow(0);// 第一行
		for (int i = 0; i < ss.length; i++) {
			row.createCell(i).setCellValue(ss[i]);
		}
		xls.write(fos);
		fos.close();
	}

	/**
	 * @info 寫出Excel標題內容
	 * @param fos
	 * @return
	 */
	public static byte[] writeExcel(String[] titles,
			List<Map<Integer, String>> lists) throws IOException {
		HSSFWorkbook xls = new HSSFWorkbook();
		HSSFSheet sheet = xls.createSheet();
		HSSFRow row = sheet.createRow(0);// 第一行

		for (int i = 0; i < titles.length; i++) {
			row.createCell(i).setCellValue(titles[i]);
		}
		// 內容
		int rowNum = 1;
		for (Map<Integer, String> map : lists) {
			HSSFRow rowTmp = sheet.createRow(rowNum);
			int cols = map.size();
			for (int i = 0; i < cols; i++) {
				rowTmp.createCell(i).setCellValue(map.get(i));
			}
			rowNum++;
		}
		ByteArrayOutputStream fos = new ByteArrayOutputStream();
		xls.write(fos);
		byte[] buf = fos.toByteArray();// 獲取記憶體緩衝區中的資料
		fos.close();
		return buf;
	}

	/**
	 * @info 寫出Excel標題內容
	 * @param fos
	 * @return
	 */
	public static void writeExcel(String filePath, String[] titles,
			List<Map<Integer, String>> lists) throws IOException {
		OutputStream fos = new FileOutputStream(filePath);
		HSSFWorkbook xls = new HSSFWorkbook();
		HSSFSheet sheet = xls.createSheet();
		HSSFRow row = sheet.createRow(0);// 第一行

		for (int i = 0; i < titles.length; i++) {
			row.createCell(i).setCellValue(titles[i]);
		}
		// 內容
		int rowNum = 1;
		for (Map<Integer, String> map : lists) {
			HSSFRow rowTmp = sheet.createRow(rowNum);
			int cols = map.size();
			for (int i = 0; i < cols; i++) {
				rowTmp.createCell(i).setCellValue(map.get(i));
			}
			rowNum++;
		}
		xls.write(fos);
		fos.close();
	}
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	/**
	 * @info 讀取Excel內容,List行,MAP行資料
	 * @param filePath
	 * @return
	 */
	public static List<Map<String, String>> readExcelKeyMap(String filePath)
			throws IOException {
		List<Map<String, String>> contents = new LinkedList<Map<String, String>>();
		InputStream is = new FileInputStream(filePath);
		POIFSFileSystem fs = new POIFSFileSystem(is);
		HSSFWorkbook wb = new HSSFWorkbook(fs);
		HSSFSheet sheet = wb.getSheetAt(0);
		// 得到總行數
		int rowNum = sheet.getLastRowNum();

		HSSFRow row = sheet.getRow(0);// 第一行
		// 總列數
		int colNum = row.getPhysicalNumberOfCells();

		// 正文內容應該從第二行開始,第一行為表頭的標題
		String[] keys = readExcelTitle(filePath);
		for (int i = 1; i <= rowNum; i++) {
			row = sheet.getRow(i);
			int j = 0;
			Map<String, String> content = new HashMap<String, String>();
			while (j < colNum) {
				String cellValue = getCellFormatValue(row.getCell(j)).trim();

				content.put(keys[j], cellValue);
				j++;
			}
			contents.add(content);
		}
		is.close();
		return contents;
	}
	
	public static List<Map<String, String>> readExcelKeyMap(InputStream is)
			throws IOException {
		List<Map<String, String>> contents = new LinkedList<Map<String, String>>();
		POIFSFileSystem fs = new POIFSFileSystem(is);
		HSSFWorkbook wb = new HSSFWorkbook(fs);
		HSSFSheet sheet = wb.getSheetAt(0);
		// 得到總行數
		int rowNum = sheet.getLastRowNum();

		HSSFRow row = sheet.getRow(0);// 第一行
		// 總列數
		int colNum = row.getPhysicalNumberOfCells();

		// 正文內容應該從第二行開始,第一行為表頭的標題
		// 標題總列數
		String[] keys = new String[colNum];
		for (int i = 0; i < colNum; i++) {
			keys[i] = getCellFormatValue(row.getCell(i));
		}
		for (int i = 1; i <= rowNum; i++) {
			row = sheet.getRow(i);
			int j = 0;
			Map<String, String> content = new HashMap<String, String>();
			while (j < colNum) {
				String cellValue = getCellFormatValue(row.getCell(j)).trim();

				content.put(keys[j], cellValue);
				j++;
			}
			contents.add(content);
		}
		is.close();
		return contents;
	}

	/**
	 * @info 讀取Excel標題
	 * @param is
	 * @return
	 */
	public static String[] readExcelTitle(String filePath) throws IOException {
		InputStream is = new FileInputStream(filePath);
		POIFSFileSystem fs = new POIFSFileSystem(is);
		HSSFWorkbook wb = new HSSFWorkbook(fs);
		HSSFSheet sheet = wb.getSheetAt(0);
		HSSFRow row = sheet.getRow(0);// 第一行
		// 標題總列數
		int colNum = row.getPhysicalNumberOfCells();
		String[] title = new String[colNum];
		for (int i = 0; i < colNum; i++) {
			title[i] = getCellFormatValue(row.getCell(i));
		}
		is.close();
		return title;
	}

	/**
	 * @info 讀取Excel內容,List行,MAP行資料
	 * @param filePath
	 * @return
	 */
	public static List<Map<Integer, String>> readExcelContent(String filePath)
			throws IOException {
		List<Map<Integer, String>> contents = new LinkedList<Map<Integer, String>>();
		InputStream is = new FileInputStream(filePath);
		POIFSFileSystem fs = new POIFSFileSystem(is);
		HSSFWorkbook wb = new HSSFWorkbook(fs);
		HSSFSheet sheet = wb.getSheetAt(0);
		// 得到總行數
		int rowNum = sheet.getLastRowNum();

		HSSFRow row = sheet.getRow(0);// 第一行
		// 總列數
		int colNum = row.getPhysicalNumberOfCells();

		// 正文內容應該從第二行開始,第一行為表頭的標題

		for (int i = 1; i <= rowNum; i++) {
			row = sheet.getRow(i);
			int j = 0;
			Map<Integer, String> content = new HashMap<Integer, String>();
			while (j < colNum) {
				String cellValue = getCellFormatValue(row.getCell(j)).trim();
				content.put(j, cellValue);
				j++;
			}
			contents.add(content);
		}
		is.close();
		return contents;
	}

	/**
	 * @info 讀取Excel值
	 * @param cell
	 * @return
	 */
	static String getCellFormatValue(HSSFCell cell) {
		String cellvalue = "";
		
		if (cell != null) {
			switch (cell.getCellType()) {
			case HSSFCell.CELL_TYPE_NUMERIC: {
				BigDecimal b = new BigDecimal(cell.getNumericCellValue());
				cellvalue = b.toPlainString();
				break;
			}
			case HSSFCell.CELL_TYPE_FORMULA: {
				cell.setCellType(Cell.CELL_TYPE_STRING);
				cellvalue = cell.getStringCellValue();
				//System.out.println(cellvalue);
				break;
			}
			case HSSFCell.CELL_TYPE_STRING:
				cellvalue = cell.getRichStringCellValue().getString();
				//System.out.println(cellvalue);
				break;
			default:
				cellvalue = "";
			}
		} else {
			cellvalue = "";
		}
		return cellvalue;

	}

	/**
	 * @info 讀取Excel值
	 * @param cell
	 * @return
	 */
	static String getStringCellValue(HSSFCell cell) {
		String strCell = "";
		switch (cell.getCellType()) {
		case HSSFCell.CELL_TYPE_STRING:
			strCell = cell.getStringCellValue();
			break;
		case HSSFCell.CELL_TYPE_NUMERIC:
			strCell = String.valueOf(cell.getNumericCellValue());
			break;
		case HSSFCell.CELL_TYPE_BOOLEAN:
			strCell = String.valueOf(cell.getBooleanCellValue());
			break;
		case HSSFCell.CELL_TYPE_BLANK:
			strCell = "";
			break;
		default:
			strCell = "";
			break;
		}
		if (strCell.equals("") || strCell == null) {
			return "";
		}
		return strCell;
	}
}