我找不到如何使用Apache POI API删除列。
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邮件列表中的Alan Williamson写了一个小帮手来删除列
package org.alanwilliamson.openbd.plugin.spreadsheet; import org.apache.poi.ss.usermodel.Cell; import org.apache.poi.ss.usermodel.Row; import org.apache.poi.ss.usermodel.Sheet; /* * Helper functions to aid in the management of sheets */ public class SheetUtility extends Object { /** * Given a sheet,this method deletes a column from a sheet and moves * all the columns to the right of it to the left one cell. * * Note,this method will not update any formula references. * * @param sheet * @param column */ public static void deleteColumn( Sheet sheet,int columnToDelete ){ int maxColumn = 0; for ( int r=0; r < sheet.getLastRowNum()+1; r++ ){ Row row = sheet.getRow( r ); // if no row exists here; then nothing to do; next! if ( row == null ) continue; // if the row doesn't have this many columns then we are good; next! int lastColumn = row.getLastCellNum(); if ( lastColumn > maxColumn ) maxColumn = lastColumn; if ( lastColumn < columnToDelete ) continue; for ( int x=columnToDelete+1; x < lastColumn + 1; x++ ){ Cell oldCell = row.getCell(x-1); if ( oldCell != null ) row.removeCell( oldCell ); Cell nextCell = row.getCell( x ); if ( nextCell != null ){ Cell newCell = row.createCell( x-1,nextCell.getCellType() ); cloneCell(newCell,nextCell); } } } // Adjust the column widths for ( int c=0; c < maxColumn; c++ ){ sheet.setColumnWidth( c,sheet.getColumnWidth(c+1) ); } } /* * Takes an existing Cell and merges all the styles and forumla * into the new one */ private static void cloneCell( Cell cNew,Cell cOld ){ cNew.setCellComment( cOld.getCellComment() ); cNew.setCellStyle( cOld.getCellStyle() ); switch ( cNew.getCellType() ){ case Cell.CELL_TYPE_BOOLEAN:{ cNew.setCellValue( cOld.getBooleanCellValue() ); break; } case Cell.CELL_TYPE_NUMERIC:{ cNew.setCellValue( cOld.getNumericCellValue() ); break; } case Cell.CELL_TYPE_STRING:{ cNew.setCellValue( cOld.getStringCellValue() ); break; } case Cell.CELL_TYPE_ERROR:{ cNew.setCellValue( cOld.getErrorCellValue() ); break; } case Cell.CELL_TYPE_FORMULA:{ cNew.setCellFormula( cOld.getCellFormula() ); break; } } } }
cporte的答案非常好，但是imho有点难以阅读。
理念：
对于每一行，删除代表将被删除的列的单元格，并将该列右侧的所有单元格向左移一位。
简化的实施：
//Variables for completeness Sheet sheet; int columnToDelete; for (int rId = 0; rId < sheet.getLastRowNum(); rId++) { Row row = sheet.getRow(rId); for (int cID = columnToDelete; cID < row.getLastCellNum(); cID++) { Cell cOld = row.getCell(cID); if (cOld != null) { row.removeCell(cOld); } Cell cNext = row.getCell(cID + 1); if (cNext != null) { Cell cNew = row.createCell(cID,cNext.getCellType()); cloneCell(cNext,cNew); sheet.setColumnWidth(cID,sheet.getColumnWidth(cID + 1)); } } }
private static void cloneCell( Cell cNew,Cell cOld ){ cNew.setCellComment( cOld.getCellComment() ); cNew.setCellStyle( cOld.getCellStyle() ); switch ( cNew.getCellType() ){ case Cell.CELL_TYPE_BOOLEAN:{ cNew.setCellValue( cOld.getBooleanCellValue() ); break; } case Cell.CELL_TYPE_NUMERIC:{ cNew.setCellValue( cOld.getNumericCellValue() ); break; } case Cell.CELL_TYPE_STRING:{ cNew.setCellValue( cOld.getStringCellValue() ); break; } case Cell.CELL_TYPE_ERROR:{ cNew.setCellValue( cOld.getErrorCellValue() ); break; } case Cell.CELL_TYPE_FORMULA:{ cNew.setCellFormula( cOld.getCellFormula() ); break; } } }
我认为你必须去每个hssfRow，并调用hssfRow.getCell，然后hssfRow.removeCell。 这个API面向行而不是列，只有很少的操作在整个列级别上工作。
示例代码（未经测试）：
hssfSheet sheet = ... int colToRemove = 5; Iterator rowIter = sheet.iterator(); while (rowIter.hasNext()) { hssfRow row = (hssfRow)rowIter.next(); hssfCell cell = row.getCell(colToRemove); row.removeCell(cell); }
codewing的解决方案为我工作像一个魅力与以下小的变化：
当我们克隆单元格时，调用应该是cloneCell（cNew，cNext）
我们应该只为第一行设置列宽。
我使用的版本3.17的api，所以有一些改变（像CellType从int更改为一个枚举）。
完整的代码在下面（为了清楚）：
private void deleteColumn(Sheet sheet,int columnToDelete) { for (int rId = 0; rId < sheet.getLastRowNum(); rId++) { Row row = sheet.getRow(rId); for (int cID = columnToDelete; cID < row.getLastCellNum(); cID++) { Cell cOld = row.getCell(cID); if (cOld != null) { row.removeCell(cOld); } Cell cNext = row.getCell(cID + 1); if (cNext != null) { Cell cNew = row.createCell(cID,cNext.getCellTypeEnum()); cloneCell(cNew,cNext); //Set the column width only on the first row. //Other wise the second row will overwrite the original column width set prevIoUsly. if(rId == 0) { sheet.setColumnWidth(cID,sheet.getColumnWidth(cID + 1)); } } } } } private void cloneCell(Cell cNew,Cell cOld) { cNew.setCellComment(cOld.getCellComment()); cNew.setCellStyle(cOld.getCellStyle()); if (CellType.BOOLEAN == cNew.getCellTypeEnum()) { cNew.setCellValue(cOld.getBooleanCellValue()); } else if (CellType.NUMERIC == cNew.getCellTypeEnum()) { cNew.setCellValue(cOld.getNumericCellValue()); } else if (CellType.STRING == cNew.getCellTypeEnum()) { cNew.setCellValue(cOld.getStringCellValue()); } else if (CellType.ERROR == cNew.getCellTypeEnum()) { cNew.setCellValue(cOld.getErrorCellValue()); } else if (CellType.FORMULA == cNew.getCellTypeEnum()) { cNew.setCellValue(cOld.getCellFormula()); } }
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