如何转置与POI SS / XSSF表？

我正在使用POI XSSF API，我想转置一个工作表。

我怎样才能做到这一点？

谢谢。

Answer 1

转置，如交换A2与B1和A3与C1（所以列成行）？

如果是这样，就没有内置任何东西，所以你需要自己做一些编码。 你可能想要抓住一对单元格，保存一个（值和样式）的内容，复制第一个，然后覆盖第二个。

如果您不确定所有阅读/书写部件，请参阅快速指南 。

Answer 2

我正在寻找相同的答案，不得不自己编码。 我附上了我的解决scheme，这很简单：

1. 确定行数
2. 确定使用的最大列数
3. 遍历每一行，每一列
4. 将Cell从该行/列保存为一个简单的列表，作为“CellModel”types
5. 完成后，遍历所有CellModel
6. 切换列和行索引并将CellModel保存到工作表中

我使用的代码是：

public static void transpose(Workbook wb, int sheetNum, boolean replaceOriginalSheet) { Sheet sheet = wb.getSheetAt(sheetNum); Pair<Integer, Integer> lastRowColumn = getLastRowAndLastColumn(sheet); int lastRow = lastRowColumn.getFirst(); int lastColumn = lastRowColumn.getSecond(); LOG.debug("Sheet {} has {} rows and {} columns, transposing ...", new Object[] {sheet.getSheetName(), 1+lastRow, lastColumn}); List<CellModel> allCells = new ArrayList<CellModel>(); for (int rowNum = 0; rowNum <= lastRow; rowNum++) { Row row = sheet.getRow(rowNum); if (row == null) { continue; } for (int columnNum = 0; columnNum < lastColumn; columnNum++) { Cell cell = row.getCell(columnNum); allCells.add(new CellModel(cell)); } } LOG.debug("Read {} cells ... transposing them", allCells.size()); Sheet tSheet = wb.createSheet(sheet.getSheetName() + "_transposed"); for (CellModel cm : allCells) { if (cm.isBlank()) { continue; } int tRow = cm.getColNum(); int tColumn = cm.getRowNum(); Row row = tSheet.getRow(tRow); if (row == null) { row = tSheet.createRow(tRow); } Cell cell = row.createCell(tColumn); cm.insertInto(cell); } lastRowColumn = getLastRowAndLastColumn(sheet); lastRow = lastRowColumn.getFirst(); lastColumn = lastRowColumn.getSecond(); LOG.debug("Transposing done. {} now has {} rows and {} columns.", new Object[] {tSheet.getSheetName(), 1+lastRow, lastColumn}); if (replaceOriginalSheet) { int pos = wb.getSheetIndex(sheet); wb.removeSheetAt(pos); wb.setSheetOrder(tSheet.getSheetName(), pos); } } private static Pair<Integer, Integer> getLastRowAndLastColumn(Sheet sheet) { int lastRow = sheet.getLastRowNum(); int lastColumn = 0; for (Row row : sheet) { if (lastColumn < row.getLastCellNum()) { lastColumn = row.getLastCellNum(); } } return new Pair<Integer, Integer>(lastRow, lastColumn); } 

因此，CellModel是一个包含Cell包含的数据的包装器（如果您喜欢，例如注释等，您可以添加更多的属性）：

 static class CellModel { private int rowNum = -1; private int colNum = -1; private CellStyle cellStyle; private int cellType = -1; private Object cellValue; public CellModel(Cell cell) { if (cell != null) { this.rowNum = cell.getRowIndex(); this.colNum = cell.getColumnIndex(); this.cellStyle = cell.getCellStyle(); this.cellType = cell.getCellType(); switch (this.cellType) { case Cell.CELL_TYPE_BLANK: break; case Cell.CELL_TYPE_BOOLEAN: cellValue = cell.getBooleanCellValue(); break; case Cell.CELL_TYPE_ERROR: cellValue = cell.getErrorCellValue(); break; case Cell.CELL_TYPE_FORMULA: cellValue = cell.getCellFormula(); break; case Cell.CELL_TYPE_NUMERIC: cellValue = cell.getNumericCellValue(); break; case Cell.CELL_TYPE_STRING: cellValue = cell.getRichStringCellValue(); break; } } } public boolean isBlank() { return this.cellType == -1 && this.rowNum == -1 && this.colNum == -1; } public void insertInto(Cell cell) { if (isBlank()) { return; } cell.setCellStyle(this.cellStyle); cell.setCellType(this.cellType); switch (this.cellType) { case Cell.CELL_TYPE_BLANK: break; case Cell.CELL_TYPE_BOOLEAN: cell.setCellValue((boolean) this.cellValue); break; case Cell.CELL_TYPE_ERROR: cell.setCellErrorValue((byte) this.cellValue); break; case Cell.CELL_TYPE_FORMULA: cell.setCellFormula((String) this.cellValue); break; case Cell.CELL_TYPE_NUMERIC: cell.setCellValue((double) this.cellValue); break; case Cell.CELL_TYPE_STRING: cell.setCellValue((RichTextString) this.cellValue); break; } } public CellStyle getCellStyle() { return cellStyle; } public int getCellType() { return cellType; } public Object getCellValue() { return cellValue; } public int getRowNum() { return rowNum; } public int getColNum() { return colNum; } }