Excel工具类

import java.io.IOException;
import java.io.InputStream;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.DateUtil;
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.junit.Test;
import org.springframework.web.multipart.MultipartFile;

public class ExcelUtils {
	/**
	 * 从输入流中获取Workbook对象
	 * 
	 * @param inputStream
	 * @param fileName
	 * @return
	 */
	public static Workbook getWorkbook(InputStream inputStream, String fileName) {
		Workbook wb = null;
		boolean isE2007 = false; // 判断是否是excel2007格式
		if (fileName.endsWith("xlsx")) {
			isE2007 = true;
		}
		try {
			if (isE2007) {
				wb = new XSSFWorkbook(inputStream);
			} else {
				wb = new HSSFWorkbook(inputStream);
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
		return wb;
	}

	/**
	 * 从文件中获取Workbook对象
	 * 
	 * @param file
	 * @return
	 */
	public static Workbook getWorkbook(MultipartFile file) {
		Workbook wb = null;
		try {
			wb = getWorkbook(file.getInputStream(),file.getOriginalFilename());
		} catch (IOException e) {
			e.printStackTrace();
		}
		return wb;
	}

	/**
	 * 获取单元格的值
	 * 
	 * @param cell
	 * 
	 * @return
	 */
	public static String getCellValue(Cell cell) {
		if (cell == null)
			return "";
		if (cell.getCellType() == Cell.CELL_TYPE_STRING) {
			return cell.getStringCellValue();
		} else if (cell.getCellType() == Cell.CELL_TYPE_BOOLEAN) {
			return String.valueOf(cell.getBooleanCellValue());
		} else if (cell.getCellType() == Cell.CELL_TYPE_FORMULA) {
			return cell.getCellFormula();
		} else if (cell.getCellType() == Cell.CELL_TYPE_NUMERIC) {
			if (HSSFDateUtil.isCellDateFormatted(cell)) {
				short format = cell.getCellStyle().getDataFormat();
				SimpleDateFormat sdf = null;
				if (format == 14 || format == 31 || format == 57 || format == 58) {
					//日期
					sdf = new SimpleDateFormat("yyyy-MM-dd");
				} else if (format == 20 || format == 32) {
					//时间
					sdf = new SimpleDateFormat("HH:mm");
				}
				double value = cell.getNumericCellValue();
				Date date = DateUtil.getJavaDate(value);
				return sdf.format(date);
			}else {
				return String.valueOf(cell.getNumericCellValue());
			}
		}
		return "";
	}
	
	/**
	 * 获取单元格的值,根据行列号获取,支持合并单元格获取值
	 * 
	 * @param sheet
	 * @param row
	 * @param column
	 *
	 * @return
	 */
	public static String getCellValueEx(Sheet sheet,int row,int column) {
		if(isMergedRegion(sheet,row,column)) {
			return getMergedRegionValue(sheet, row, column);
		}else {
			Cell cell = sheet.getRow(row).getCell(column);
			return getCellValue(cell);
		}
	}

	/**
	 * 合并单元格处理,获取合并行
	 * 
	 * @param sheet
	 * 
	 * @return List<CellRangeAddress>
	 */
	public static List<CellRangeAddress> getCombineCell(Sheet sheet) {
		List<CellRangeAddress> list = new ArrayList<CellRangeAddress>();
		// 获得一个 sheet 中合并单元格的数量
		int sheetmergerCount = sheet.getNumMergedRegions();
		// 遍历所有的合并单元格
		for (int i = 0; i < sheetmergerCount; i++) {
			// 获得合并单元格保存进list中
			CellRangeAddress ca = sheet.getMergedRegion(i);
			list.add(ca);
		}
		return list;
	}

	public static int getRowNum(List<CellRangeAddress> listCombineCell, Cell cell, Sheet sheet) {
		int xr = 0;
		int firstC = 0;
		int lastC = 0;
		int firstR = 0;
		int lastR = 0;
		for (CellRangeAddress ca : listCombineCell) {
			// 获得合并单元格的起始行, 结束行, 起始列, 结束列
			firstC = ca.getFirstColumn();
			lastC = ca.getLastColumn();
			firstR = ca.getFirstRow();
			lastR = ca.getLastRow();
			if (cell.getRowIndex() >= firstR && cell.getRowIndex() <= lastR) {
				if (cell.getColumnIndex() >= firstC && cell.getColumnIndex() <= lastC) {
					xr = lastR;
				}
			}

		}
		return xr;
	}

	/**
	 * 判断单元格是否为合并单元格，是的话则将单元格的值返回
	 * 
	 * @param listCombineCell  存放合并单元格的list
	 * @param cell             需要判断的单元格
	 * @param sheet            sheet
	 * 
	 * @return
	 */
	public static String isCombineCell(List<CellRangeAddress> listCombineCell, Cell cell, Sheet sheet) throws Exception {
		int firstC = 0;
		int lastC = 0;
		int firstR = 0;
		int lastR = 0;
		String cellValue = null;
		for (CellRangeAddress ca : listCombineCell) {
			// 获得合并单元格的起始行, 结束行, 起始列, 结束列
			firstC = ca.getFirstColumn();
			lastC = ca.getLastColumn();
			firstR = ca.getFirstRow();
			lastR = ca.getLastRow();
			if (cell.getRowIndex() >= firstR && cell.getRowIndex() <= lastR) {
				if (cell.getColumnIndex() >= firstC && cell.getColumnIndex() <= lastC) {
					Row fRow = sheet.getRow(firstR);
					Cell fCell = fRow.getCell(firstC);
					cellValue = getCellValue(fCell);
					break;
				}
			} else {
				cellValue = "";
			}
		}
		return cellValue;
	}

	/**
	 * 获取合并单元格的值
	 * 
	 * @param sheet
	 * @param row
	 * @param column
	 * 
	 * @return
	 */
	public static String getMergedRegionValue(Sheet sheet, int row, int column) {
		int sheetMergeCount = sheet.getNumMergedRegions();

		for (int i = 0; i < sheetMergeCount; i++) {
			CellRangeAddress ca = sheet.getMergedRegion(i);
			int firstColumn = ca.getFirstColumn();
			int lastColumn = ca.getLastColumn();
			int firstRow = ca.getFirstRow();
			int lastRow = ca.getLastRow();

			if (row >= firstRow && row <= lastRow) {
				if (column >= firstColumn && column <= lastColumn) {
					Row fRow = sheet.getRow(firstRow);
					Cell fCell = fRow.getCell(firstColumn);
					return getCellValue(fCell);
				}
			}
		}

		return null;
	}

	/**
	 * 判断指定的单元格是否是合并单元格
	 * 
	 * @param sheet
	 * @param row    行下标
	 * @param column 列下标
	 * 
	 * @return
	 */
	public static boolean isMergedRegion(Sheet sheet, int row, int column) {
		int sheetMergeCount = sheet.getNumMergedRegions();
		for (int i = 0; i < sheetMergeCount; i++) {
			CellRangeAddress range = sheet.getMergedRegion(i);
			int firstColumn = range.getFirstColumn();
			int lastColumn = range.getLastColumn();
			int firstRow = range.getFirstRow();
			int lastRow = range.getLastRow();
			if (row >= firstRow && row <= lastRow) {
				if (column >= firstColumn && column <= lastColumn) {
					return true;
				}
			}
		}
		return false;
	}
}

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