将两个Excel表单合并到一个Excel工作簿中，而不将它们加载到内存中
伙计们，
我们有一个要求，我们要将两个Excel表单合并到一个使用JAVA的工作簿中。
我们知道这可以用Apache POI来完成。
但我们不想做下面的事情。 我们只是想将这两个excel文件合并到单个工作簿中。
Donot do：将Excel文件加载到内存中。 他们的内容超过了10万行。
谢谢。
您不能将工作表复制到另一个工作簿。 您需要为您创build一个新的工作簿，然后创build工作表并逐个添加工作表的内容。
我可以用2种方法来帮你复制行，并复制单元格和方法：
/** * Copy row with style and merged region. This manage a shift in copy. You can copy row 1 to 10 and paste it between. this method can be use for copying in same sheet * 21 and 30 * @param pSrcSheet source sheet * @param pDestSheet dest sheet * @param pSrcLine line to copy * @param pDestLine line to paste * @param pStyleMap just get a new HashMap<Integer, CellStyle> pStyleMap * @param pLineShift the shift set 0 if you don't need to shift your row. Example copy row 1 to 10 and paste it between 21 and 30 you * need set thhe shift value 20. The value could be negative to pick up the data */ public static void copyRow(Sheet pSrcSheet, Sheet pDestSheet, Row pSrcLine, Row pDestLine, Map<Integer, CellStyle> pStyleMap, int pLineShift) { ArrayList<CellRangeAddress> mergedRegions = getMergedRegions(pDestSheet); pDestLine.setHeight(pSrcLine.getHeight()); for (int j = pSrcLine.getFirstCellNum(); j < pSrcLine.getLastCellNum(); j++) { Cell oldCell = null; Cell newCell = null; // if no cell in row skip the iteration if (j >= 0) { oldCell = pSrcLine.getCell(j); newCell = pDestLine.getCell(j, Row.CREATE_NULL_AS_BLANK); } if (oldCell != null) { if (newCell == null) { newCell = pDestLine.createCell(j); } copyCell(oldCell, newCell, pStyleMap); CellRangeAddress mergedRegion = getCurrentMergedRegion(pSrcSheet, pSrcLine.getRowNum(), (short) oldCell.getColumnIndex()); if (mergedRegion != null) { CellRangeAddress newMergedRegion = new CellRangeAddress(mergedRegion.getFirstRow() + pLineShift, mergedRegion.getLastRow() + pLineShift, mergedRegion.getFirstColumn(), mergedRegion.getLastColumn()); if (isNewMergedRegion(newMergedRegion, mergedRegions)) { mergedRegions.add(newMergedRegion); pDestSheet.addMergedRegion(newMergedRegion); } } } } } /** * Copy cell with style from same workbook or not * @param pOldCell * @param pNewCell * @param pStyleMap */ public static void copyCell(Cell pOldCell, Cell pNewCell, Map<Integer, CellStyle> pStyleMap) { if (pStyleMap != null) { if (pOldCell.getSheet().getWorkbook() == pNewCell.getSheet().getWorkbook()) { pNewCell.setCellStyle(pOldCell.getCellStyle()); } else { int stHashCode = pOldCell.getCellStyle().hashCode(); CellStyle newCellStyle = pStyleMap.get(stHashCode); if (newCellStyle == null) { newCellStyle = pNewCell.getSheet().getWorkbook().createCellStyle(); newCellStyle.cloneStyleFrom(pOldCell.getCellStyle()); pStyleMap.put(stHashCode, newCellStyle); } pNewCell.setCellStyle(newCellStyle); } } switch (pOldCell.getCellType()) { case Cell.CELL_TYPE_STRING: pNewCell.setCellValue(pOldCell.getStringCellValue()); break; case Cell.CELL_TYPE_NUMERIC: pNewCell.setCellValue(pOldCell.getNumericCellValue()); break; case Cell.CELL_TYPE_BLANK: pNewCell.setCellType(Cell.CELL_TYPE_BLANK); break; case Cell.CELL_TYPE_BOOLEAN: pNewCell.setCellValue(pOldCell.getBooleanCellValue()); break; case Cell.CELL_TYPE_ERROR: pNewCell.setCellErrorValue(pOldCell.getErrorCellValue()); break; case Cell.CELL_TYPE_FORMULA: pNewCell.setCellFormula(pOldCell.getCellFormula()); break; default: break; } } /** * return the cellRangeAdress of the merge region where the cell is. Null if the cell is not in merged region * @param pSheet * @param pRowNum * @param pCellNum * @return return the cellRangeAdress of the merge region where the cell is. Null if the cell is not in merged * region */ public static CellRangeAddress getCurrentMergedRegion(Sheet pSheet, int pRowNum, int pCellNum) { for (int i = 0; i < pSheet.getNumMergedRegions(); i++) { CellRangeAddress merged = pSheet.getMergedRegion(i); if (merged.isInRange(pRowNum, pCellNum)) { return merged; } } return null; } /** * return the index of the merge region where the cell is. -1 if the cell is not in merged region * @param pSheet * @param pRowNum * @param pCellNum * @return return the index of the merge region where the cell is. -1 if the cell is not in merged region */ public static int getCurrentMergedRegionIndex(Sheet pSheet, int pRowNum, int pCellNum) { for (int i = 0; i < pSheet.getNumMergedRegions(); i++) { CellRangeAddress merged = pSheet.getMergedRegion(i); if (merged.isInRange(pRowNum, pCellNum)) { return i; } } return -1; } /** * return the cellRangeAdress of the merge region where the cell is. Null if the cell is not in merged region * @param pSheet * @param pRowNum * @param pCellNum * @return return the cellRangeAdress of the merge region where the cell is. Null if the cell is not in merged * region */ public static ArrayList<CellRangeAddress> getMergedRegions(Sheet pSheet) { ArrayList<CellRangeAddress> mergedRegions = new ArrayList<CellRangeAddress>(); for (int i = 0; i < pSheet.getNumMergedRegions(); i++) { mergedRegions.add(pSheet.getMergedRegion(i)); } return mergedRegions; } /** * verify all boolean are true * @param pValues * @return */ public static boolean areAllTrue(boolean... pValues) { for (int i = 0; i < pValues.length; ++i) { if (pValues[i] != true) { return false; } } return true; } /** * Compare 2 region if they are the same return true * @param pRegion region compare to pRegion2 * @param pRegion2 region compare to pRegion * @return true if the region are the same, false if region are different */ public static boolean cellRangeAdressEquals(CellRangeAddress pRegion, CellRangeAddress pRegion2) { boolean r1 = (pRegion.getFirstRow() == pRegion2.getFirstRow()); boolean r2 = (pRegion.getLastRow() == pRegion2.getLastRow()); boolean c1 = (pRegion.getFirstColumn() == pRegion2.getFirstColumn()); boolean c2 = (pRegion.getLastColumn() == pRegion2.getLastColumn()); return areAllTrue(r1, r2, c1, c2); } /** * Verify the it's a new region or existing * @param pNewMergedRegion * @param pMergedRegions * @return */ public static boolean isNewMergedRegion(CellRangeAddress pNewMergedRegion, ArrayList<CellRangeAddress> pMergedRegions) { boolean isNew = true; int i = 0; // we want to check if newMergedRegion is contained inside our collection while (pMergedRegions != null && i < pMergedRegions.size() && isNew) { if (cellRangeAdressEquals(pMergedRegions.get(i), pNewMergedRegion)) { isNew = false; } i++; } return isNew; } 你可以在这个线程上find一些帮助： http : //www.coderanch.com/t/420958/open-source/Copying-sheet-excel-file-excel
如果您有更多关于您的问题的信息，我会尽我所能帮助您;）