程式碼:

package com.weichai;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.util.Iterator;

import org.apache.poi.ss.usermodel.DateUtil;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFCellStyle;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class Test {

	public static void main(String[] args) throws Exception {
		// TODO Auto-generated method stub
		// 將所有型別的盡調excel檔案合併成一個excel檔案
		String Path = "D:\\ExcelTest";
		File file = new File(Path);
		File[] tempList = file.listFiles();
		String TmpList [] = new String [2];
		System.out.println("該目錄下物件個數：" + tempList.length);
		for (int i = 0; i < tempList.length; i++) {
			if (tempList[i].isFile()) {
				TmpList[i] = tempList[i].toString();
				System.out.println("檔案:"+TmpList[i]+" 待處理");
			}
		}
		XSSFWorkbook newExcelCreat = new XSSFWorkbook();
		for (String fromExcelName : TmpList) {    // 遍歷每個源excel檔案，TmpList為原始檔的名稱集合
			InputStream in = new FileInputStream(fromExcelName);
			XSSFWorkbook fromExcel = new XSSFWorkbook(in);
			int length = fromExcel.getNumberOfSheets();
			if(length<=1){       //長度為1時
				XSSFSheet oldSheet = fromExcel.getSheetAt(0);
				XSSFSheet newSheet = newExcelCreat.createSheet(oldSheet.getSheetName());
			    copySheet(newExcelCreat, oldSheet, newSheet);
			}else{
				for (int i = 0; i < length; i++) {// 遍歷每個sheet
					XSSFSheet oldSheet = fromExcel.getSheetAt(i);
					XSSFSheet newSheet = newExcelCreat.createSheet(oldSheet.getSheetName());
					copySheet(newExcelCreat, oldSheet, newSheet);
				}
			}
		}
		String allFileName = Path+ "\\New.xlsx";    //定義新生成的xlx表格檔案
		FileOutputStream fileOut = new FileOutputStream(allFileName);
		newExcelCreat.write(fileOut);
		fileOut.flush();
		fileOut.close();
//		// 刪除各個原始檔
//		for (String fromExcelName : TmpList) {// 遍歷每個源excel檔案
//			File Existfile = new File(fromExcelName);
//			if (Existfile.exists()) {
//				Existfile.delete();
//			}
//		}
		System.out.println("執行結束!");
	}

	public static void copyCellStyle(XSSFCellStyle fromStyle, XSSFCellStyle toStyle) {

		toStyle.cloneStyleFrom(fromStyle);// 此一行程式碼搞定
		// 下面統統不用
		/*
		 * //對齊方式 toStyle.setAlignment(fromStyle.getAlignment()); //邊框和邊框顏色
		 * toStyle.setBorderBottom(fromStyle.getBorderBottom());
		 * toStyle.setBorderLeft(fromStyle.getBorderLeft());
		 * toStyle.setBorderRight(fromStyle.getBorderRight());
		 * toStyle.setBorderTop(fromStyle.getBorderTop());
		 * toStyle.setTopBorderColor(fromStyle.getTopBorderColor());
		 * toStyle.setBottomBorderColor(fromStyle.getBottomBorderColor());
		 * toStyle.setRightBorderColor(fromStyle.getRightBorderColor());
		 * toStyle.setLeftBorderColor(fromStyle.getLeftBorderColor()); //背景和前景
		 * //toStyle.setFillPattern(fromStyle.getFillPattern());
		 * //填充圖案，不起作用，轉為黑色
		 * toStyle.setFillBackgroundColor(fromStyle.getFillBackgroundColor());
		 * //不起作用
		 * toStyle.setFillForegroundColor(fromStyle.getFillForegroundColor());
		 * toStyle.setDataFormat(fromStyle.getDataFormat()); //資料格式
		 * //toStyle.setFont(fromStyle.getFont()); //不起作用
		 * toStyle.setHidden(fromStyle.getHidden());
		 * toStyle.setIndention(fromStyle.getIndention());//首行縮排
		 * toStyle.setLocked(fromStyle.getLocked());
		 * toStyle.setRotation(fromStyle.getRotation());//旋轉
		 * toStyle.setVerticalAlignment(fromStyle.getVerticalAlignment());
		 * //垂直對齊 toStyle.setWrapText(fromStyle.getWrapText()); //文字換行
		 */
	}

	/**
	 * 合併單元格
	 * @param fromSheet
	 * @param toSheet
	 */
	public static void mergeSheetAllRegion(XSSFSheet fromSheet, XSSFSheet toSheet) {
		int num = fromSheet.getNumMergedRegions();
		CellRangeAddress cellR = null;
		for (int i = 0; i < num; i++) {
			cellR = fromSheet.getMergedRegion(i);
			toSheet.addMergedRegion(cellR);
		}
	}

	/**
	 * 複製單元格 
	 * @param wb
	 * @param fromCell
	 * @param toCell
	 */
	public static void copyCell(XSSFWorkbook wb, XSSFCell fromCell, XSSFCell toCell) {
		XSSFCellStyle newstyle = wb.createCellStyle();
		copyCellStyle(fromCell.getCellStyle(), newstyle);
	  //  toCell.setEncoding(fromCell.getStringCelllValue());
		// 樣式
		toCell.setCellStyle(newstyle);
		if (fromCell.getCellComment() != null) {
			toCell.setCellComment(fromCell.getCellComment());
		}
		// 不同資料型別處理
		int fromCellType = fromCell.getCellType();
		toCell.setCellType(fromCellType);
		if (fromCellType == XSSFCell.CELL_TYPE_NUMERIC) {
			if (XSSFDateUtil.isCellDateFormatted(fromCell)) {
				toCell.setCellValue(fromCell.getDateCellValue());
			} else {
				toCell.setCellValue(fromCell.getNumericCellValue());
			}
		} else if (fromCellType == XSSFCell.CELL_TYPE_STRING) {
			toCell.setCellValue(fromCell.getRichStringCellValue());
		} else if (fromCellType == XSSFCell.CELL_TYPE_BLANK) {
			// nothing21
		} else if (fromCellType == XSSFCell.CELL_TYPE_BOOLEAN) {
			toCell.setCellValue(fromCell.getBooleanCellValue());
		} else if (fromCellType == XSSFCell.CELL_TYPE_ERROR) {
			toCell.setCellErrorValue(fromCell.getErrorCellValue());
		} else if (fromCellType == XSSFCell.CELL_TYPE_FORMULA) {
			toCell.setCellFormula(fromCell.getCellFormula());
		} else { // nothing29
		}

	}

	/**
	 * 行復制功能
	 * @param wb
	 * @param oldRow
	 * @param toRow
	 */
	public static void copyRow(XSSFWorkbook wb, XSSFRow oldRow, XSSFRow toRow) {
		toRow.setHeight(oldRow.getHeight());
		for (Iterator cellIt = oldRow.cellIterator(); cellIt.hasNext();) {
			XSSFCell tmpCell = (XSSFCell) cellIt.next();
			XSSFCell newCell = toRow.createCell(tmpCell.getColumnIndex());
			copyCell(wb, tmpCell, newCell);
		}
	}

	/**
	 * Sheet複製 
	 * @param wb
	 * @param fromSheet
	 * @param toSheet
	 */
	public static void copySheet(XSSFWorkbook wb, XSSFSheet fromSheet, XSSFSheet toSheet) {
		mergeSheetAllRegion(fromSheet, toSheet);
		// 設定列寬
		int length = fromSheet.getRow(fromSheet.getFirstRowNum()).getLastCellNum();
		for (int i = 0; i <= length; i++) {
			toSheet.setColumnWidth(i, fromSheet.getColumnWidth(i));
		}
		for (Iterator rowIt = fromSheet.rowIterator(); rowIt.hasNext();) {
			XSSFRow oldRow = (XSSFRow) rowIt.next();
			XSSFRow newRow = toSheet.createRow(oldRow.getRowNum());
			copyRow(wb, oldRow, newRow);
		}
	}

	public class XSSFDateUtil extends DateUtil {

	}

}
 

執行截圖:

將Student1和Student2的資料整合到一個Excel表單中

生成的New.xlsx檔案如下圖所示: