springboot、springmvc，excel上傳解析、下載excel工具類

工具類共7個方法：

    

     /**
     * 1）對外方法：解析上傳的excel,只含一個sheet kly
     * @example: List<String[]> strArrayList = ExcelUtil.getExcelData(MultipartFile);
     */
     /**
	 * 2）對外方法：獲取第幾個sheet頁的數據方便解析多sheet：kly 20191211
	 * 
	 * @example: List<String[]> strArrayList =
	 *           ExcelUtil.getExcelData(MultipartFile,（第二個sheet:2）);
	 */
    /**
	 * 3）對外方法：將數據存儲成excel2003文件到服務器的某個路徑下
	 * 
	 * @example:ExcelUtil.excelLocal("D://問價", "文件名", String[] headers（第一行標題）, List<Object[]>
	 *                               datas（第二行往下的數據）)
	 */
     /**
	 * 4）對外方法：導出單sheet excel2003無樣式（用於導出下載模板使用）
	 * @example : ExcelUtil.excelExport("文件名",String[] headers(標題), List<Object[]>
	 *          datas(數據),HttpServletResponse);
	 */
    /**
	 * 5）對外方法：導出excel2003，含多個sheet無樣式（用於導出下載模板使用）.
	 * @example : String fileName = "模板excel名字"; 
	 *          String sheet1Name = "sheet1Name";
	 *          String sheet2Name = "sheet2Name";
	 * 
	 *          String[] sheet1Head = { "sheet1Head1", "sheet1Head2" }; 
	 *          String[] sheet2Head = { "sheet2Head1", "sheet2Head2", "sheet2Head3"};
	 * 
	 *          LinkedHashMap<String, String[]> headersMap = new LinkedHashMap<String, String[]>(); 
	 *          headersMap.put(sheet1Name,sheet1Head); 
	 *          headersMap.put(sheet2Name, sheet2Head);
	 * 
	 *          List<Object[]> sheet1Content = service.getSheet1Content();
	 *          List<Object[]> sheet2Content = service.getSheet2Content();
	 * 
	 *          LinkedHashMap<String, List<Object[]>> datasMap = new LinkedHashMap<String, List<Object[]>>(); 
	 *          datasMap.put(sheet1Name,sheet1Content);
	 *          datasMap.put(sheet2Name, sheet2Content);
	 * 
	 *          ExcelUtil.excelExport(fileName, headersMap, datasMap,HttpServletResponse);
	 */
/**
	 * 6）對外方法：導出excel2003，單sheet帶樣式（用於用戶下載數據）kly
	 * String[] titles = { "title1", "title2"};
	 * List<LinkedHashMap<String, Object>> dataList = services.getDatalist();//從service中獲取數據
	 * //設置導出的列格式，NUMERIC爲數值，STRING：爲字符串和日期，BOOLEAN:Boolean，FORMULA:公式，BLANK:空值，ERROR:故障。（表示導出列的格式類型爲文本還是數值） 
	 * CellType[] styles = { CellType.STRING, CellType.NUMERIC};
	 * ExcelData.poiExportExcel(excelName, titles,dataList,styles,HttpServletResponse);
	 */
     /**
	 * 7）對外方法：導出excel2003，多 sheet帶樣式（用於用戶下載數據）kly
	 * @example : String fileName = "模板excel名字"; 
	 *          String sheet1Name = "sheet1Name";
	 *          String sheet2Name = "sheet2Name";
	 * 
	 *          String[] sheet1Head = { "sheet1Head1", "sheet1Head2" }; 
	 *          String[] sheet2Head = { "sheet2Head1", "sheet2Head2", "sheet2Head3"};
	 * 
	 *          LinkedHashMap<String, String[]> headersMap = new LinkedHashMap<String, String[]>(); 
	 *          headersMap.put(sheet1Name,sheet1Head); 
	 *          headersMap.put(sheet2Name, sheet2Head);
	 * 
	 *          List<LinkedHashMap<String, Object>> sheet1Content = service.getSheet1Content();
	 *          List<LinkedHashMap<String, Object>> sheet2Content = service.getSheet2Content();
	 * 
	 *          LinkedHashMap<String, List<LinkedHashMap<String, Object>>> datasMap = new LinkedHashMap<String, List<LinkedHashMap<String, Object>>>() 
	 *          datasMap.put(sheet1Name,sheet1Content);
	 *          datasMap.put(sheet2Name, sheet2Content);
	 *          
	 *          CellType[] styles1 = { CellType.STRING, CellType.NUMERIC }; 
	 *          CellType[] styles2 = { CellType.STRING, CellType.NUMERIC,CellType.STRING};
	 * 
	 *          LinkedHashMap<String, CellType[]> stylesMap = new LinkedHashMap<String, CellType[]>(); 
	 *          stylesMap.put(sheet1Name,styles1); 
	 *          stylesMap.put(sheet2Name, styles2);
	 * 
	 *          ExcelUtil.poiExportExcel(fileName, headersMap, datasMap,stylesMap,HttpServletResponse);
	 */

引用的pom.xml包含slf4j未列出

        <dependency>
			<groupId>org.apache.poi</groupId>
			<artifactId>poi</artifactId>
			<version>3.17</version>
		</dependency>
		<dependency>
			<groupId>org.apache.poi</groupId>
			<artifactId>poi-ooxml</artifactId>
			<version>3.17</version>
		</dependency>
		<dependency>
			<groupId>org.apache.poi</groupId>
			<artifactId>poi-ooxml-schemas</artifactId>
			<version>3.17</version>
		</dependency>
		<dependency>
			<groupId>org.apache.commons</groupId>
			<artifactId>commons-lang3</artifactId>
		</dependency>
		<dependency>
			<groupId>commons-io</groupId>
			<artifactId>commons-io</artifactId>
			<version>2.6</version>
		</dependency>

工具類內容：

package util;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URLEncoder;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

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.HSSFDataFormat;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
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.HSSFColor;
import org.apache.poi.ss.usermodel.BorderStyle;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.CellType;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.HorizontalAlignment;
import org.apache.poi.ss.usermodel.IndexedColors;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.VerticalAlignment;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.MediaType;
import org.springframework.web.multipart.MultipartFile;

/**
 * excel工具類
 * 
 * @author 小威老師 [email protected] 和kly
 *
 */
public class ExcelUtil {

	private static final Logger log = LoggerFactory.getLogger(ExcelUtil.class);

	/**
	 * 1）對外方法：解析上傳的excel,只含一個sheet kly
	 * 
	 * @param file
	 * @return
	 * @throws IOException
	 * @example: List<String[]> strArrayList = ExcelUtil.getExcelData(MultipartFile);
	 */
	public static List<String[]> getExcelData(MultipartFile file) throws IOException {
		if (!checkFile(file)) {
			return null;
		}
		;
		// 獲得Workbook工作薄對象
		Workbook workbook = getWorkBook(file);
		// 創建返回對象，把每行中的值作爲一個數組，所有行作爲一個集合返回
		List<String[]> list = new ArrayList<String[]>();
		if (workbook != null) {
			for (int sheetNum = 0; sheetNum < workbook.getNumberOfSheets(); sheetNum++) {
				// 獲得當前sheet工作表
				Sheet sheet = workbook.getSheetAt(sheetNum);
				if (sheet == null) {
					continue;
				}
				// 獲得當前sheet的開始行
				int firstRowNum = sheet.getFirstRowNum();
				// 獲得當前sheet的結束行
				int lastRowNum = sheet.getLastRowNum();
				// 循環除了第一行的所有行
				for (int rowNum = firstRowNum + 1; rowNum <= lastRowNum; rowNum++) {
					// 獲得當前行
					Row row = sheet.getRow(rowNum);
					if (row == null) {
						continue;
					}
					// 獲得當前行的開始列
					int firstCellNum = row.getFirstCellNum();
					// 獲得當前行的列數
					int lastCellNum = row.getLastCellNum();
					String[] cells = new String[row.getLastCellNum()];
					// 循環當前行
					for (int cellNum = firstCellNum; cellNum < lastCellNum; cellNum++) {
						Cell cell = row.getCell(cellNum);
						cells[cellNum] = getCellValue(cell);
					}
					list.add(cells);
				}
			}
		}
		return list;
	}

	/**
	 * 2）對外方法：獲取第幾個sheet頁的數據方便解析多sheet：kly 20191211
	 * 
	 * @param file
	 * @param sheetNum
	 * @return
	 * @throws IOException
	 * @example: List<String[]> strArrayList =
	 *           ExcelUtil.getExcelData(MultipartFile,（第一個sheet:1）);
	 */
	public static List<String[]> getExcelData(MultipartFile file, Integer sheetNum) throws IOException {
		sheetNum--;
		if (!checkFile(file)) {
			return null;
		}
		;
		// 獲得Workbook工作薄對象
		Workbook workbook = getWorkBook(file);
		// 創建返回對象，把每行中的值作爲一個數組，所有行作爲一個集合返回
		List<String[]> list = new ArrayList<String[]>();
		if (workbook != null) {
			if (sheetNum >= workbook.getNumberOfSheets()) {
				return null;
			}

			Sheet sheet = workbook.getSheetAt(sheetNum);
			if (sheet == null) {
				return null;
			}
			// 獲得當前sheet的開始行
			int firstRowNum = sheet.getFirstRowNum();
			// 獲得當前sheet的結束行
			int lastRowNum = sheet.getLastRowNum();
			// 循環除了第一行的所有行
			for (int rowNum = firstRowNum + 1; rowNum <= lastRowNum; rowNum++) {
				// 獲得當前行
				Row row = sheet.getRow(rowNum);
				if (row == null) {
					continue;
				}
				// 獲得當前行的開始列
				int firstCellNum = row.getFirstCellNum();
				// 獲得當前行的列數
				int lastCellNum = row.getLastCellNum();
				String[] cells = new String[row.getLastCellNum()];
				// 循環當前行
				for (int cellNum = firstCellNum; cellNum < lastCellNum; cellNum++) {
					Cell cell = row.getCell(cellNum);
					cells[cellNum] = getCellValue(cell);
				}
				list.add(cells);
			}

		}
		return list;
	}

	/**
	 * 解析Excel輔助類 ：獲取對應類型的Workbook（excel2003 和 excel2007有別）
	 * 
	 * @param file kly
	 * @return
	 */
	public static Workbook getWorkBook(MultipartFile file) {
		// 獲得文件名
		String fileName = file.getOriginalFilename();
		// 創建Workbook工作薄對象，表示整個excel
		Workbook workbook = null;
		try {
			// 獲取excel文件的io流
			InputStream is = file.getInputStream();
			// 根據文件後綴名不同(xls和xlsx)獲得不同的Workbook實現類對象
			if (fileName.endsWith("xls")) {
				// 2003
				workbook = new HSSFWorkbook(is);
			} else if (fileName.endsWith("xlsx")) {
				// 2007 及2007以上
				workbook = new XSSFWorkbook(is);
			}
		} catch (IOException e) {
			log.error(e.getMessage());
		}
		return workbook;
	}

	/**
	 * 解析Excel輔助類 ：解析單元格的值 -kly
	 * 
	 * @param cell
	 * @return
	 */
	public static String getCellValue(Cell cell) {
		String cellValue = "";
		if (cell == null) {
			return cellValue;
		}
		// 判斷數據的類型
		switch (cell.getCellTypeEnum()) {
		case NUMERIC: // 數字和日期
			cellValue = stringDateProcess(cell);
			break;
		case STRING: // 字符串
			cellValue = String.valueOf(cell.getStringCellValue());
			break;
		case BOOLEAN: // Boolean
			cellValue = String.valueOf(cell.getBooleanCellValue());
			break;
		case FORMULA: // 公式
			cellValue = String.valueOf(cell.getCellFormula());
			break;
		case BLANK: // 空值
			cellValue = "";
			break;
		case ERROR: // 故障
			cellValue = "非法字符";
			break;
		default:
			cellValue = "未知類型";
			break;
		}
		return cellValue;
	}

	/**
	 * 解析Excel輔助類 ：時間格式處理
	 * 
	 * @return
	 * @author Liu Xin Nan
	 * @data 2017年11月27日
	 */
	public static String stringDateProcess(Cell cell) {
		String result = new String();
		if (HSSFDateUtil.isCellDateFormatted(cell)) {// 處理日期格式、時間格式
			SimpleDateFormat sdf = null;
			if (cell.getCellStyle().getDataFormat() == HSSFDataFormat.getBuiltinFormat("h:mm")) {
				sdf = new SimpleDateFormat("HH:mm");
			} else {// 日期
				sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
			}
			Date date = cell.getDateCellValue();
			result = sdf.format(date);
		} else if (cell.getCellStyle().getDataFormat() == 58) {
			// 處理自定義日期格式：m月d日(通過判斷單元格的格式id解決，id的值是58)
			SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
			double value = cell.getNumericCellValue();
			Date date = org.apache.poi.ss.usermodel.DateUtil.getJavaDate(value);
			result = sdf.format(date);
		} else {
			double value = cell.getNumericCellValue();
			CellStyle style = cell.getCellStyle();
			DecimalFormat format = new DecimalFormat();
			String temp = style.getDataFormatString();
			// 單元格設置成常規
			if (temp.equals("General")) {
				format.applyPattern("#");
			}
			result = format.format(value);
		}

		return result;
	}

	/**
	 * 解析Excel輔助類 ：檢查文件是否存在 kly
	 * 
	 * @param file
	 * @throws IOException
	 */
	public static Boolean checkFile(MultipartFile file) throws IOException {

		// 判斷文件是否存在
		if (null == file) {
			log.error("文件不存在！");
			return false;
		}
		// 獲得文件名
		String fileName = file.getOriginalFilename();
		// 判斷文件是否是excel文件
		if (!fileName.endsWith("xls") && !fileName.endsWith("xlsx")) {
			log.error(fileName + "不是excel文件");
			return false;
		}
		return true;
	}

	/**
	 * 3）對外方法：將數據存儲成excel2003文件到服務器的某個路徑下
	 * 
	 * @param path
	 * @param fileName
	 * @param headers
	 * @param datas
	 * @example:ExcelUtil.excelLocal("D://問價", "文件名", String[] headers（第一行標題）, List<Object[]>
	 *                               datas（第二行往下的數據）)
	 */
	public static void excelLocal(String path, String fileName, String[] headers, List<Object[]> datas) {
		Workbook workbook = getWorkbook(headers, datas);
		if (workbook != null) {
			ByteArrayOutputStream byteArrayOutputStream = null;
			FileOutputStream fileOutputStream = null;
			try {
				byteArrayOutputStream = new ByteArrayOutputStream();
				workbook.write(byteArrayOutputStream);

				String suffix = ".xls";
				File file = new File(path + File.separator + fileName + suffix);
				if (!file.getParentFile().exists()) {
					file.getParentFile().mkdirs();
				}

				fileOutputStream = new FileOutputStream(file);
				fileOutputStream.write(byteArrayOutputStream.toByteArray());
			} catch (Exception e) {
				e.printStackTrace();
			} finally {
				try {
					if (fileOutputStream != null) {
						fileOutputStream.close();
					}
				} catch (IOException e) {
					e.printStackTrace();
				}
				try {
					if (byteArrayOutputStream != null) {
						byteArrayOutputStream.close();
					}
				} catch (IOException e) {
					e.printStackTrace();
				}

				try {
					workbook.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
	}

	/**
	 * 4）對外方法：導出單sheet excel2003無樣式（用於導出下載模板使用）
	 * 
	 * @param fileName
	 * @param headers
	 * @param datas
	 * @param response
	 * @example : ExcelUtil.excelExport("文件名",String[] headers(標題), List<Object[]>
	 *          datas(數據),HttpServletResponse);
	 */
	public static void excelExport(String fileName, String[] headers, List<Object[]> datas,
			HttpServletResponse response) {
		Workbook workbook = getWorkbook(headers, datas);
		if (workbook != null) {
			ByteArrayOutputStream byteArrayOutputStream = null;
			try {
				byteArrayOutputStream = new ByteArrayOutputStream();
				workbook.write(byteArrayOutputStream);

				String suffix = ".xls";
				response.setContentType("application/vnd.ms-excel;charset=utf-8");
				response.setHeader("Content-Disposition",
						"attachment;filename=" + new String((fileName + suffix).getBytes(), "iso-8859-1"));

				OutputStream outputStream = response.getOutputStream();
				outputStream.write(byteArrayOutputStream.toByteArray());
				outputStream.close();
			} catch (Exception e) {
				e.printStackTrace();
			} finally {
				try {
					if (byteArrayOutputStream != null) {
						byteArrayOutputStream.close();
					}
				} catch (IOException e) {
					e.printStackTrace();
				}

				try {
					workbook.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
	}

	/**
	 * 5）對外方法：導出excel2003，含多個sheet無樣式（用於導出下載模板使用）.
	 * 
	 * @param request
	 * @param response
	 * @example : String fileName = "模板excel名字"; 
	 *          String sheet1Name = "sheet1Name";
	 *          String sheet2Name = "sheet2Name";
	 * 
	 *          String[] sheet1Head = { "sheet1Head1", "sheet1Head2" }; 
	 *          String[] sheet2Head = { "sheet2Head1", "sheet2Head2", "sheet2Head3"};
	 * 
	 *          LinkedHashMap<String, String[]> headersMap = new LinkedHashMap<String, String[]>(); 
	 *          headersMap.put(sheet1Name,sheet1Head); 
	 *          headersMap.put(sheet2Name, sheet2Head);
	 * 
	 *          List<Object[]> sheet1Content = service.getSheet1Content();
	 *          List<Object[]> sheet2Content = service.getSheet2Content();
	 * 
	 *          LinkedHashMap<String, List<Object[]>> datasMap = new LinkedHashMap<String, List<Object[]>>(); 
	 *          datasMap.put(sheet1Name,sheet1Content);
	 *          datasMap.put(sheet2Name, sheet2Content);
	 * 
	 *          ExcelUtil.excelExport(fileName, headersMap, datasMap,HttpServletResponse);
	 */
	public static void excelExport(String fileName, LinkedHashMap<String, String[]> headersMap,
			LinkedHashMap<String, List<Object[]>> datasMap, HttpServletResponse response) {
		try {

			response.setContentType("application/msexcel");
			response.setHeader("Content-disposition",
					"attachment; filename=" + new String(fileName.getBytes("UTF-8"), "8859_1") + ".xls");

			HSSFWorkbook workbook = new HSSFWorkbook();
			OutputStream os = response.getOutputStream();

			if (null == datasMap) {
				workbook.write(os);
				os.close();
				workbook.close();
				return;
			}

			Set<Entry<String, String[]>> set = headersMap.entrySet();
			Iterator<Entry<String, String[]>> iterator = set.iterator();
			while (iterator.hasNext()) {
				Entry<String, String[]> entry = iterator.next();
				createExcelSheet(workbook, entry.getKey(), headersMap, datasMap);
			}

			os = response.getOutputStream();
			workbook.write(os);
			os.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * 
	 * 輔助工具類：用戶導出單sheet EXCEL生成數據
	 * 
	 * @param headers 列頭
	 * @param datas   數據
	 * @return
	 */
	public static Workbook getWorkbook(String[] headers, List<Object[]> datas) {
		Workbook workbook = new HSSFWorkbook();

		Sheet sheet = workbook.createSheet();
		Row row = null;
		Cell cell = null;
		CellStyle style = workbook.createCellStyle();
		style.setAlignment(HorizontalAlignment.CENTER_SELECTION);

		Font font = workbook.createFont();

		int line = 0, maxColumn = 0;
		if (headers != null && headers.length > 0) {// 設置列頭
			row = sheet.createRow(line++);
			row.setHeightInPoints(23);
			font.setBold(true);
			font.setFontHeightInPoints((short) 13);
			style.setFont(font);

			maxColumn = headers.length;
			for (int i = 0; i < maxColumn; i++) {
				cell = row.createCell(i);
				cell.setCellValue(headers[i]);
				cell.setCellStyle(style);
			}
		}

		if (datas != null && datas.size() > 0) {// 渲染數據
			for (int index = 0, size = datas.size(); index < size; index++) {
				Object[] data = datas.get(index);
				if (data != null && data.length > 0) {
					row = sheet.createRow(line++);
					row.setHeightInPoints(20);

					int length = data.length;
					if (length > maxColumn) {
						maxColumn = length;
					}

					for (int i = 0; i < length; i++) {
						cell = row.createCell(i);
						cell.setCellValue(data[i] == null ? null : data[i].toString());
					}
				}
			}
		}

		for (int i = 0; i < maxColumn; i++) {
			sheet.autoSizeColumn(i);
		}

		return workbook;
	}

	/**
	 * 輔助工具類：用戶導出多sheet EXCEL生成數據
	 * 
	 * @param workbook
	 * @param sheetName
	 * @param dataMap
	 */
	public static void createExcelSheet(HSSFWorkbook workbook, String sheetName, Map<String, String[]> headersMap,
			Map<String, List<Object[]>> datasMap) {
		String[] headers = headersMap.get(sheetName);
		List<Object[]> datas = datasMap.get(sheetName);
		try {
			Sheet sheet = workbook.createSheet(sheetName);

			Row row = null;
			Cell cell = null;
			CellStyle style = workbook.createCellStyle();
			style.setAlignment(HorizontalAlignment.CENTER_SELECTION);

			Font font = workbook.createFont();

			int line = 0, maxColumn = 0;
			if (headers != null && headers.length > 0) {// 設置列頭
				row = sheet.createRow(line++);
				row.setHeightInPoints(23);
				font.setBold(true);
				font.setFontHeightInPoints((short) 13);
				style.setFont(font);

				maxColumn = headers.length;
				for (int i = 0; i < maxColumn; i++) {
					cell = row.createCell(i);
					cell.setCellValue(headers[i]);
					cell.setCellStyle(style);
				}
			}

			if (datas != null && datas.size() > 0) {// 渲染數據
				for (int index = 0, size = datas.size(); index < size; index++) {
					Object[] data = datas.get(index);
					if (data != null && data.length > 0) {
						row = sheet.createRow(line++);
						row.setHeightInPoints(20);

						int length = data.length;
						if (length > maxColumn) {
							maxColumn = length;
						}

						for (int i = 0; i < length; i++) {
							cell = row.createCell(i);
							cell.setCellValue(data[i] == null ? null : data[i].toString());
						}
					}
				}
			}

			for (int i = 0; i < maxColumn; i++) {
				sheet.autoSizeColumn(i);
			}

		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * 6）對外方法：導出excel2003，單sheet帶樣式（用於用戶下載數據）kly
	 * 
	 * @param filename
	 * @param titles
	 * @param data
	 * @param styles
	 * @param response
	 * @return
	 * @throws IOException 
	 * @example：
	 * String[] titles = { "title1", "title2"};
	 * List<LinkedHashMap<String, Object>> dataList = services.getDatalist();//從service中獲取數據
	 * //設置導出的列格式，NUMERIC爲數值，STRING：爲字符串和日期，BOOLEAN:Boolean，FORMULA:公式，BLANK:空值，ERROR:故障。（表示導出列的格式類型爲文本還是數值） 
	 * CellType[] styles = { CellType.STRING, CellType.NUMERIC};
	 * ExcelData.poiExportExcel(excelName, titles,dataList,styles,HttpServletResponse);
	 */
	public static void poiExportExcel(String filename, String[] titles, List<LinkedHashMap<String, Object>> data,
			CellType[] styles, HttpServletResponse response) throws IOException {

		response.reset();// 清空輸出流
		// 設置下載的文件名
		response.setCharacterEncoding("utf-8");
		response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
		response.setHeader("Content-Disposition",
				"attachment;filename=" + URLEncoder.encode(filename + ".xls", "utf-8"));
		response.flushBuffer();

		OutputStream os = response.getOutputStream();// 取得輸出流

		// --之後把excel寫到流文件裏
		HSSFWorkbook workbook = new HSSFWorkbook();
		HSSFSheet sheet = workbook.createSheet("sheet1"); // 建立新的sheet對象

		HSSFCellStyle titleStyle = workbook.createCellStyle();// 表頭樣式
		HSSFFont titlefont = workbook.createFont();// 表頭字體
		setTitleCellStyle(titleStyle, titlefont);

		HSSFCellStyle contentStyle = workbook.createCellStyle();// 內容樣式
		HSSFFont contentfont = workbook.createFont();// 表頭字體
		setContentCellStyle(contentStyle, contentfont);

		// 創建第一行：爲titles行
		HSSFRow row1 = sheet.createRow((short) 0);
		for (int i = 0; i < titles.length; i++) {
			HSSFCell cell = row1.createCell((short) i);
			cell.setCellValue(titles[i]);
			cell.setCellStyle(titleStyle);
		}

		// 生成第二行，數據來源於data
		List<LinkedHashMap<String, Object>> datas = data;
		for (int i = 0; i < datas.size(); i++) {
			// 從第二行開始創建
			HSSFRow row = sheet.createRow((i + 1));
			Map<String, Object> map = datas.get(i);
			Iterator<Entry<String, Object>> iter = map.entrySet().iterator();
			int j = 0;
			while (iter.hasNext()) {
				Map.Entry<String, Object> entry = (Map.Entry<String, Object>) iter.next();
				Object val = entry.getValue();

				HSSFCell cell = row.createCell((short) j);
				setCellType(cell, styles[j], val);
				cell.setCellStyle(contentStyle);
				j++;

			}
		}

		workbook.write(os);
		workbook.close();
	}

	/**
	 * 7）對外方法：導出excel2003，多 sheet帶樣式（用於用戶下載數據）kly
	 * 
	 * @param workbook
	 * @param sheetName
	 * @param headers
	 * @param datasMap
	 * @param stylesMap
	 * @param titleStyle
	 * @param contentStyle
	 * @example : String fileName = "模板excel名字"; 
	 *          String sheet1Name = "sheet1Name";
	 *          String sheet2Name = "sheet2Name";
	 * 
	 *          String[] sheet1Head = { "sheet1Head1", "sheet1Head2" }; 
	 *          String[] sheet2Head = { "sheet2Head1", "sheet2Head2", "sheet2Head3"};
	 * 
	 *          LinkedHashMap<String, String[]> headersMap = new LinkedHashMap<String, String[]>(); 
	 *          headersMap.put(sheet1Name,sheet1Head); 
	 *          headersMap.put(sheet2Name, sheet2Head);
	 * 
	 *          List<LinkedHashMap<String, Object>> sheet1Content = service.getSheet1Content();
	 *          List<LinkedHashMap<String, Object>> sheet2Content = service.getSheet2Content();
	 * 
	 *          LinkedHashMap<String, List<LinkedHashMap<String, Object>>> datasMap = new LinkedHashMap<String, List<LinkedHashMap<String, Object>>>() 
	 *          datasMap.put(sheet1Name,sheet1Content);
	 *          datasMap.put(sheet2Name, sheet2Content);
	 *          
	 *          CellType[] styles1 = { CellType.STRING, CellType.NUMERIC }; 
	 *          CellType[] styles2 = { CellType.STRING, CellType.NUMERIC,CellType.STRING};
	 * 
	 *          LinkedHashMap<String, CellType[]> stylesMap = new LinkedHashMap<String, CellType[]>(); 
	 *          stylesMap.put(sheet1Name,styles1); 
	 *          stylesMap.put(sheet2Name, styles2);
	 * 
	 *          ExcelUtil.poiExportExcel(fileName, headersMap, datasMap,stylesMap,HttpServletResponse);
	 */
	public static void poiExportExcel(String filename, LinkedHashMap<String, String[]> titlesMap,
			LinkedHashMap<String, List<LinkedHashMap<String, Object>>> datasMap,
			LinkedHashMap<String, CellType[]> stylesMap, HttpServletResponse response) throws IOException {

		response.reset();// 清空輸出流
		// 設置下載的文件名
		response.setCharacterEncoding("utf-8");
		response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
		response.setHeader("Content-Disposition",
				"attachment;filename=" + URLEncoder.encode(filename + ".xls", "utf-8"));
		response.flushBuffer();

		HSSFWorkbook workbook = new HSSFWorkbook();
		OutputStream os = response.getOutputStream();

		if (null == datasMap) {
			workbook.write(os);
			os.close();
			workbook.close();
			return;
		}

		HSSFCellStyle titleStyle = workbook.createCellStyle();// 表頭樣式
		HSSFFont titlefont = workbook.createFont();// 表頭字體
		setTitleCellStyle(titleStyle, titlefont);

		HSSFCellStyle contentStyle = workbook.createCellStyle();// 內容樣式
		HSSFFont contentfont = workbook.createFont();// 表頭字體
		setContentCellStyle(contentStyle, contentfont);

		Set<Entry<String, String[]>> set = titlesMap.entrySet();
		Iterator<Entry<String, String[]>> iterator = set.iterator();
		while (iterator.hasNext()) {
			Entry<String, String[]> entry = iterator.next();
			createExcelSheet(workbook, entry.getKey(), titlesMap, datasMap, stylesMap, titleStyle, contentStyle);
		}

		os = response.getOutputStream();
		workbook.write(os);
		os.close();
		workbook.close();
	}

	/**
	 * 輔助工具類：用戶輔助導出多sheet，workbook 創建sheet
	 * 
	 * @param workbook
	 * @param sheetName
	 * @param headers
	 * @param datasMap
	 * @param stylesMap
	 * @param titleStyle
	 * @param contentStyle
	 */
	private static void createExcelSheet(HSSFWorkbook workbook, String sheetName,
			LinkedHashMap<String, String[]> headers,
			LinkedHashMap<String, List<LinkedHashMap<String, Object>>> datasMap,
			LinkedHashMap<String, CellType[]> stylesMap, HSSFCellStyle titleStyle, HSSFCellStyle contentStyle) {

		String[] titles = headers.get(sheetName);
		List<LinkedHashMap<String, Object>> datas = datasMap.get(sheetName);
		CellType[] styles = stylesMap.get(sheetName);
		HSSFSheet sheet = workbook.createSheet(sheetName);

		// 創建第一行：爲titles行titles
		HSSFRow row1 = sheet.createRow((short) 0);
		for (int i = 0; i < titles.length; i++) {
			HSSFCell cell = row1.createCell((short) i);
			cell.setCellValue(titles[i]);
			cell.setCellStyle(titleStyle);
		}

		// 生成第二行，數據來源於datas
		for (int i = 0; i < datas.size(); i++) {
			// 從第二行開始創建
			HSSFRow row = sheet.createRow((i + 1));
			Map<String, Object> map = datas.get(i);
			Iterator<Entry<String, Object>> iter = map.entrySet().iterator();
			int j = 0;
			while (iter.hasNext()) {
				Map.Entry<String, Object> entry = (Map.Entry<String, Object>) iter.next();
				Object val = entry.getValue();

				HSSFCell cell = row.createCell((short) j);
				setCellType(cell, styles[j], val);
				cell.setCellStyle(contentStyle);
				j++;

			}
		}
	}

	/**
	 * 輔助工具類：帶出帶樣式：設置單元格格式類型
	 * 
	 * @param cell
	 * @param i
	 * @param val
	 */
	public static void setCellType(HSSFCell cell, CellType i, Object val) {
		if (i == CellType.NUMERIC) {
			cell.setCellType(CellType.NUMERIC);
			cell.setCellValue(Double.parseDouble(val.toString()));
		} else if (i == CellType.STRING) {
			cell.setCellType(CellType.STRING);
			cell.setCellValue(val.toString());
		} else if (i == CellType.BLANK) {
			cell.setCellType(CellType.STRING);
			cell.setCellValue("");
		}

	}

	/**
	 * 輔助工具類：導出帶樣式的：設置title樣式
	 * 
	 * @param style
	 * @param font
	 */
	public static void setTitleCellStyle(HSSFCellStyle style, HSSFFont font) {
		// 設置這些樣式
		style.setAlignment(HorizontalAlignment.CENTER);// 水平居中
		style.setVerticalAlignment(VerticalAlignment.CENTER);// 垂直居中

		// 背景色
		// style.setFillForegroundColor(IndexedColors.ORANGE.getIndex());前景色
		// style.setFillPattern(FillPatternType.BIG_SPOTS);
		style.setFillBackgroundColor(IndexedColors.AQUA.getIndex());

		// 設置邊框
		style.setBorderBottom(BorderStyle.MEDIUM);
		style.setBottomBorderColor(IndexedColors.BLACK.getIndex());
		style.setBorderLeft(BorderStyle.MEDIUM);
		style.setLeftBorderColor(IndexedColors.BLACK.getIndex());
		style.setBorderRight(BorderStyle.MEDIUM);
		style.setRightBorderColor(IndexedColors.BLACK.getIndex());
		style.setBorderTop(BorderStyle.MEDIUM);
		style.setTopBorderColor(IndexedColors.BLACK.getIndex());
		style.setWrapText(true);// 自動換行

		font.setFontHeightInPoints((short) 10);
		font.setColor(HSSFColor.HSSFColorPredefined.BLACK.getIndex());
		font.setBold(true);
		font.setFontName("宋體");
		// 把字體 應用到當前樣式
		style.setFont(font);
	}

	/**
	 * 輔助工具類：導出帶樣式的：設置內容樣式
	 * 
	 * @param cell
	 * @param i
	 * @param val
	 */
	public static void setContentCellStyle(HSSFCellStyle contentstyle, HSSFFont font) {

		// 設置邊框
		contentstyle.setBorderBottom(BorderStyle.THIN);
		contentstyle.setBottomBorderColor(IndexedColors.BLACK.getIndex());
		contentstyle.setBorderLeft(BorderStyle.THIN);
		contentstyle.setLeftBorderColor(IndexedColors.BLACK.getIndex());
		contentstyle.setBorderRight(BorderStyle.THIN);
		contentstyle.setRightBorderColor(IndexedColors.BLACK.getIndex());
		contentstyle.setBorderTop(BorderStyle.THIN);
		contentstyle.setTopBorderColor(IndexedColors.BLACK.getIndex());

		font.setFontHeightInPoints((short) 10);
		font.setColor(HSSFColor.HSSFColorPredefined.BLACK.getIndex());
		font.setBold(false);
		font.setFontName("宋體");
		// 把字體 應用到當前樣式
		contentstyle.setFont(font);
	}
}