java中對於excel的操作

package com.huachan.common.utils;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.reflect.Method;
import java.net.URLEncoder;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.disk.DiskFileItem;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFPalette;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.CellValue;
import org.apache.poi.ss.usermodel.FormulaEvaluator;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.commons.CommonsMultipartFile;

/**
 * 對excel進行讀取輸出
 * 
 * @author 閔渭凱 2018年5月9日
 */
public class ExcelUtil {

	// --------------------start------------------------將excel文件轉爲List--------------------start-----------------
	private int totalRows = 0;

	private int totalCells = 0;

	private String errorMsg;

	/**
	 * 驗證EXCEL文件
	 * 
	 * @param filePath
	 * @return
	 */
	public boolean validateExcel(String filePath) {
		if (filePath == null || !(WDWUtil.isExcel2003(filePath) || WDWUtil.isExcel2007(filePath))) {
			errorMsg = "文件名不是excel格式";
			return false;
		}
		return true;
	}

	/**
	 * 讀EXCEL文件
	 * 
	 * @param fielName
	 * @return
	 */
	public List<Map<Object, Object>> getExcelInfo(String fileName, MultipartFile Mfile) {

		// 把spring文件上傳的MultipartFile轉換成File
		CommonsMultipartFile cf = (CommonsMultipartFile) Mfile;
		DiskFileItem fi = (DiskFileItem) cf.getFileItem();
		File file = fi.getStoreLocation();

		List<Map<Object, Object>> userList = new ArrayList<>();
		InputStream is = null;
		try {
			// 驗證文件名是否合格
			if (!validateExcel(fileName)) {
				return null;
			}
			// 判斷文件時2003版本還是2007版本
			boolean isExcel2003 = true;
			if (WDWUtil.isExcel2007(fileName)) {
				isExcel2003 = false;
			}
			is = new FileInputStream(file);
			userList = getExcelInfo(is, isExcel2003);
			is.close();
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if (is != null) {
				try {
					is.close();
				} catch (IOException e) {
					is = null;
					e.printStackTrace();
				}
			}
		}
		return userList;
	}

	/**
	 * 此方法兩個參數InputStream是字節流。isExcel2003是excel是2003還是2007版本
	 * 
	 * @param is
	 * @param isExcel2003
	 * @return
	 * @throws IOException
	 */
	public List<Map<Object, Object>> getExcelInfo(InputStream is, boolean isExcel2003) {

		List<Map<Object, Object>> userList = null;
		try {
			Workbook wb = null;
			// 當excel是2003時
			if (isExcel2003) {
				wb = new HSSFWorkbook(is);
			} else {
				wb = new XSSFWorkbook(is);
			}
			userList = readExcelValue(wb);
		} catch (IOException e) {
			e.printStackTrace();
		}
		return userList;
	}

	/**
	 * 讀取Excel裏面的信息
	 * 
	 * @param wb
	 * @return
	 */
	private List<Map<Object, Object>> readExcelValue(Workbook wb) {
		// 得到第一個shell
		Sheet sheet = wb.getSheetAt(0);

		// 得到Excel的行數
		this.totalRows = sheet.getPhysicalNumberOfRows();

		// 得到Excel的列數(前提是有行數)
		if (totalRows >= 1 && sheet.getRow(0) != null) {
			this.totalCells = sheet.getRow(0).getPhysicalNumberOfCells();
		}

		List<Map<Object, Object>> userList = new ArrayList<>();
		Map<Object, Object> list = null;
		for (int r = 1; r < totalRows; r++) {

			Row row = sheet.getRow(r);
			if (row == null)
				continue;

			list = new HashMap<>();
			for (int c = 0; c < this.totalCells; c++) {
				Cell cell = row.getCell(c);
				try {

					if (null != cell) {
						list.put(c, getCellValue(wb, cell));
					}
				} catch (Exception e) {
					continue;
				}
			}
			userList.add(list);
		}
		return userList;
	}

	private static Object getCellValue(Workbook wb, Cell cell) {
		Object columnValue = null;
		if (cell != null) {
			DecimalFormat df = new DecimalFormat("0");// 格式化 number
			// String
			// 字符
			SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");// 格式化日期字符串
			DecimalFormat nf = new DecimalFormat("#");// 格式化數字
			switch (cell.getCellType()) {
			case Cell.CELL_TYPE_STRING:
				columnValue = cell.getStringCellValue();
				break;
			case Cell.CELL_TYPE_NUMERIC:
				if ("@".equals(cell.getCellStyle().getDataFormatString())) {
					columnValue = df.format(cell.getNumericCellValue());
				} else if ("General".equals(cell.getCellStyle().getDataFormatString())) {
					columnValue = nf.format(cell.getNumericCellValue());
				} else {
					columnValue = sdf.format(HSSFDateUtil.getJavaDate(cell.getNumericCellValue()));
				}
				break;
			case Cell.CELL_TYPE_BOOLEAN:
				columnValue = cell.getBooleanCellValue();
				break;
			case Cell.CELL_TYPE_BLANK:
				columnValue = "";
				break;
			case Cell.CELL_TYPE_FORMULA:
				// 格式單元格
				FormulaEvaluator evaluator = wb.getCreationHelper().createFormulaEvaluator();
				evaluator.evaluateFormulaCell(cell);
				CellValue cellValue = evaluator.evaluate(cell);
				columnValue = cellValue.getNumberValue();
				break;
			default:
				columnValue = cell.toString();
			}
		}
		return columnValue;
	}

	public ExcelUtil() {
	}

	public int getTotalRows() {
		return totalRows;
	}

	public void setTotalRows(int totalRows) {
		this.totalRows = totalRows;
	}

	public int getTotalCells() {
		return totalCells;
	}

	public void setTotalCells(int totalCells) {
		this.totalCells = totalCells;
	}

	public String getErrorMsg() {
		return errorMsg;
	}

	public void setErrorMsg(String errorMsg) {
		this.errorMsg = errorMsg;
	}
	// --------------------end------------------------將excel文件轉爲List--------------------end-----------------

	// --------------------start------------------------將list轉爲excel文件--------------------start-----------------

	HttpServletResponse response;
	// 文件名
	private String fileName;
	// 文件保存路徑
	private String fileDir;
	// sheet名
	private String sheetName;
	// 表頭字體
	private String titleFontType = "Arial Unicode MS";
	// 表頭背景色
	private String titleBackColor = "C1FBEE";
	// 表頭字號
	private short titleFontSize = 12;
	// 添加自動篩選的列 如 A:M
	private String address = "";
	// 正文字體
	private String contentFontType = "Arial Unicode MS";
	// 正文字號
	private short contentFontSize = 12;
	// Float類型數據小數位
	private String floatDecimal = ".00";
	// Double類型數據小數位
	private String doubleDecimal = ".00";
	// 設置列的公式
	private String colFormula[] = null;

	DecimalFormat floatDecimalFormat = new DecimalFormat(floatDecimal);
	DecimalFormat doubleDecimalFormat = new DecimalFormat(doubleDecimal);

	private HSSFWorkbook workbook = null;

	public ExcelUtil(String fileDir, String sheetName) {
		this.fileDir = fileDir;
		this.sheetName = sheetName;
		workbook = new HSSFWorkbook();
	}

	public ExcelUtil(HttpServletResponse response, String fileName, String sheetName) {
		this.response = response;
		this.sheetName = sheetName;
		workbook = new HSSFWorkbook();
	}

	/**
	 * 設置表頭字體.
	 * 
	 * @param titleFontType
	 */
	public void setTitleFontType(String titleFontType) {
		this.titleFontType = titleFontType;
	}

	/**
	 * 設置表頭背景色.
	 * 
	 * @param titleBackColor
	 *            十六進制
	 */
	public void setTitleBackColor(String titleBackColor) {
		this.titleBackColor = titleBackColor;
	}

	/**
	 * 設置表頭字體大小.
	 * 
	 * @param titleFontSize
	 */
	public void setTitleFontSize(short titleFontSize) {
		this.titleFontSize = titleFontSize;
	}

	/**
	 * 設置表頭自動篩選欄位,如A:AC.
	 * 
	 * @param address
	 */
	public void setAddress(String address) {
		this.address = address;
	}

	/**
	 * 設置正文字體.
	 * 
	 * @param contentFontType
	 */
	public void setContentFontType(String contentFontType) {
		this.contentFontType = contentFontType;
	}

	/**
	 * 設置正文字號.
	 * 
	 * @param contentFontSize
	 */
	public void setContentFontSize(short contentFontSize) {
		this.contentFontSize = contentFontSize;
	}

	/**
	 * 設置float類型數據小數位 默認.00
	 * 
	 * @param doubleDecimal
	 *            如 ".00"
	 */
	public void setDoubleDecimal(String doubleDecimal) {
		this.doubleDecimal = doubleDecimal;
	}

	/**
	 * 設置doubel類型數據小數位 默認.00
	 * 
	 * @param floatDecimalFormat
	 *            如 ".00
	 */
	public void setFloatDecimalFormat(DecimalFormat floatDecimalFormat) {
		this.floatDecimalFormat = floatDecimalFormat;
	}

	/**
	 * 設置列的公式
	 * 
	 * @param colFormula
	 *            存儲i-1列的公式 涉及到的行號使用@替換 如A@+B@
	 */
	public void setColFormula(String[] colFormula) {
		this.colFormula = colFormula;
	}

	/**
	 * 寫excel.
	 * 
	 * @param titleColumn
	 *            對應bean的屬性名
	 * @param titleName
	 *            excel要導出的表名
	 * @param titleSize
	 *            列寬
	 * @param dataList
	 *            數據
	 */
	public void wirteExcel(String titleColumn[], String titleName[], int titleSize[], List<?> dataList) {
		// 添加Worksheet（不添加sheet時生成的xls文件打開時會報錯)
		Sheet sheet = workbook.createSheet(this.sheetName);
		// 新建文件
		OutputStream out = null;
		try {
			if (fileDir != null) {
				// 有文件路徑
				out = new FileOutputStream(fileDir);
			} else {
				// 否則，直接寫到輸出流中
				out = response.getOutputStream();
				fileName = fileName + ".xls";
				response.setContentType("application/x-msdownload");
				response.setHeader("Content-Disposition",
						"attachment; filename=" + URLEncoder.encode(fileName, "UTF-8"));
			}

			// 寫入excel的表頭
			Row titleNameRow = workbook.getSheet(sheetName).createRow(0);
			// 設置樣式
			HSSFCellStyle titleStyle = workbook.createCellStyle();
			titleStyle = (HSSFCellStyle) setFontAndBorder(titleStyle, titleFontType, (short) titleFontSize);
			titleStyle = (HSSFCellStyle) setColor(titleStyle, titleBackColor, (short) 10);

			for (int i = 0; i < titleName.length; i++) {
				sheet.setColumnWidth(i, titleSize[i] * 256); // 設置寬度
				Cell cell = titleNameRow.createCell(i);
				cell.setCellStyle(titleStyle);
				cell.setCellValue(titleName[i].toString());
			}

			// 爲表頭添加自動篩選
			if (!"".equals(address)) {
				CellRangeAddress c = (CellRangeAddress) CellRangeAddress.valueOf(address);
				sheet.setAutoFilter(c);
			}

			// 通過反射獲取數據並寫入到excel中
			if (dataList != null && dataList.size() > 0) {
				// 設置樣式
				HSSFCellStyle dataStyle = workbook.createCellStyle();
				titleStyle = (HSSFCellStyle) setFontAndBorder(titleStyle, contentFontType, (short) contentFontSize);

				if (titleColumn.length > 0) {
					for (int rowIndex = 1; rowIndex <= dataList.size(); rowIndex++) {
						Object obj = dataList.get(rowIndex - 1); // 獲得該對象
						Class clsss = obj.getClass(); // 獲得該對對象的class實例
						Row dataRow = workbook.getSheet(sheetName).createRow(rowIndex);
						for (int columnIndex = 0; columnIndex < titleColumn.length; columnIndex++) {
							String title = titleColumn[columnIndex].toString().trim();
							if (!"".equals(title)) { // 字段不爲空
								// 使首字母大寫
								String UTitle = Character.toUpperCase(title.charAt(0))
										+ title.substring(1, title.length()); // 使其首字母大寫;
								String methodName = "get" + UTitle;

								// 設置要執行的方法
								Method method = clsss.getDeclaredMethod(methodName);

								// 獲取返回類型
								String returnType = method.getReturnType().getName();

								String data = method.invoke(obj) == null ? "" : method.invoke(obj).toString();
								Cell cell = dataRow.createCell(columnIndex);
								if (data != null && !"".equals(data)) {
									if ("int".equals(returnType)) {
										cell.setCellValue(Integer.parseInt(data));
									} else if ("long".equals(returnType)) {
										cell.setCellValue(Long.parseLong(data));
									} else if ("float".equals(returnType)) {
										cell.setCellValue(floatDecimalFormat.format(Float.parseFloat(data)));
									} else if ("double".equals(returnType)) {
										cell.setCellValue(doubleDecimalFormat.format(Double.parseDouble(data)));
									} else {
										cell.setCellValue(data);
									}
								}
							} else { // 字段爲空 檢查該列是否是公式
								if (colFormula != null) {
									String sixBuf = colFormula[columnIndex].replace("@", (rowIndex + 1) + "");
									Cell cell = dataRow.createCell(columnIndex);
									cell.setCellFormula(sixBuf.toString());
								}
							}
						}
					}

				}
			}

			workbook.write(out);
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				out.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}

	/**
	 * 將16進制的顏色代碼寫入樣式中來設置顏色
	 * 
	 * @param style
	 *            保證style統一
	 * @param color
	 *            顏色：66FFDD
	 * @param index
	 *            索引 8-64 使用時不可重複
	 * @return
	 */
	public CellStyle setColor(CellStyle style, String color, short index) {
		if (color != "" && color != null) {
			// 轉爲RGB碼
			int r = Integer.parseInt((color.substring(0, 2)), 16); // 轉爲16進制
			int g = Integer.parseInt((color.substring(2, 4)), 16);
			int b = Integer.parseInt((color.substring(4, 6)), 16);
			// 自定義cell顏色
			HSSFPalette palette = workbook.getCustomPalette();
			palette.setColorAtIndex((short) index, (byte) r, (byte) g, (byte) b);

			style.setFillPattern(CellStyle.SOLID_FOREGROUND);
			style.setFillForegroundColor(index);
		}
		return style;
	}

	/**
	 * 設置字體並加外邊框
	 * 
	 * @param style
	 *            樣式
	 * @param style
	 *            字體名
	 * @param style
	 *            大小
	 * @return
	 */
	public CellStyle setFontAndBorder(CellStyle style, String fontName, short size) {
		HSSFFont font = workbook.createFont();
		font.setFontHeightInPoints(size);
		font.setFontName(fontName);
		// font.setBoldweight(true);
		style.setFont(font);
		style.setBorderBottom(CellStyle.BORDER_THIN); // 下邊框
		style.setBorderLeft(CellStyle.BORDER_THIN);// 左邊框
		style.setBorderTop(CellStyle.BORDER_THIN);// 上邊框
		style.setBorderRight(CellStyle.BORDER_THIN);// 右邊框
		return style;
	}

	/**
	 * 刪除文件
	 * 
	 * @param fileDir
	 * @return
	 */
	public boolean deleteExcel() {
		boolean flag = false;
		File file = new File(this.fileDir);
		// 判斷目錄或文件是否存在
		if (!file.exists()) { // 不存在返回 false
			return flag;
		} else {
			// 判斷是否爲文件
			if (file.isFile()) { // 爲文件時調用刪除文件方法
				file.delete();
				flag = true;
			}
		}
		return flag;
	}

	/**
	 * 刪除文件
	 * 
	 * @param fileDir
	 * @return
	 */
	public boolean deleteExcel(String path) {
		boolean flag = false;
		File file = new File(path);
		// 判斷目錄或文件是否存在
		if (!file.exists()) { // 不存在返回 false
			return flag;
		} else {
			// 判斷是否爲文件
			if (file.isFile()) { // 爲文件時調用刪除文件方法
				file.delete();
				flag = true;
			}
		}
		return flag;
	}

	/**
	 * 從服務器上下載PDF
	 * 
	 * @param fileName
	 *            文件名
	 * @param response
	 */
	public static void downLoad(String newPath, String fileName, HttpServletResponse response) {
		try {

			FileInputStream fileInputStream = new FileInputStream(newPath + fileName);
			ServletOutputStream outputStream = response.getOutputStream();
			response.setHeader("content-disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
			response.setHeader("content-type", "application/msexcel");
			// 輸出
			int len = 1;
			byte[] bs = new byte[1024];
			while ((len = fileInputStream.read(bs)) != -1) {
				outputStream.write(bs, 0, len);
			}
			fileInputStream.close();
		} catch (Exception e) {
		}
	}

	// --------------------end------------------------將list轉爲excel文件--------------------end-----------------

}

/**
 * 
 * 檢驗EXCEL文件版本
 */
class WDWUtil {
	// excel 2003
	public static boolean isExcel2003(String filePath) {
		return filePath.matches("^.+\\.(?i)(xls)$");
	}

	// excel 2007
	public static boolean isExcel2007(String filePath) {
		return filePath.matches("^.+\\.(?i)(xlsx)$");
	}

}

解析方法

// 解析excel
        ExcelUtil reu = new ExcelUtil();
List<Map<Object, Object>> companyList = reu.getExcelInfo(name, file);
List<String> exist = new ArrayList<>();

導出excel

public Map<String, Object> downloadExcel(String positionId, HttpServletResponse response) {
		Map<String, Object> map = new HashMap<>();
		try {
			// 判斷參數是否爲空
			if (StringUtils.isBlank(positionId)) {
				map.put("status", 202);
				map.put("message", "參數錯誤");
				return map;
			}
			List<JobseekerExcel> jbList = joberService.findUserById(positionId);

			List<JobseekerExcel> newJbList = FormatDataUtil.getFarmatMap(jbList);

			if (jbList.size() > 0) {
				// 文件名
				String filename = "Jobseeker.xls";
				ExcelUtil pee = new ExcelUtil(newExcelPath + filename, "sheet1");
				// 調用
				String titleColumn[] = { "company_name", "jobtitle", "createtime3", "createtime4", "name", "phone",
						"email", "gender1", "age", "location", "education1", "jobyear" };
				String titleName[] = { "企業", "職位", "職位添加時間", "候選人添加時間", "姓名", "手機號碼", "電子郵箱", "性別", "年齡", "所在地", "學歷",
						"工作年限" };
				int titleSize[] = { 25, 13, 18, 18, 13, 18, 18, 13, 13, 13, 13, 13 };
				pee.wirteExcel(titleColumn, titleName, titleSize, newJbList);
				// 響應給瀏覽器提供下載
				ExcelUtil.downLoad(newExcelPath, filename, response);
				map.put("status", 200);
				map.put("message", "候選人導出成功");
			} else {
				map.put("status", 204);
				map.put("message", "該職位暫無候選人");
			}
		} catch (Exception e) {
			map.put("status", 500);
			map.put("message", "導出異常");
		}