如何通过Apache poi复制excel中的列数据？

Question

有谁知道如何将现有的列数据复制到Excel文件中的新工作表或Apache poi的新工作簿中？数据类型是双精度和日期。

Answer 1

我附上下面的链接。他们还提供了多种不同的方式。

import java.util.Collection; 
    import java.util.HashMap; 
    import java.util.Map; 
    import java.util.Set; 
    import java.util.TreeSet; 
    import org.apache.poi.hssf.usermodel.HSSFCell; 
    import org.apache.poi.hssf.usermodel.HSSFCellStyle; 
    import org.apache.poi.hssf.usermodel.HSSFRow; 
    import org.apache.poi.hssf.usermodel.HSSFSheet; 
    import org.apache.poi.ss.util.CellRangeAddress; 

    /** 
    * 
    * @author jk 
    * getted from http://jxls.cvs.sourceforge.net/jxls/jxls/src/java/org/jxls/util/Util.java?revision=1.8&view=markup 
    * by Leonid Vysochyn 
    * and modified (adding styles copying) 
    * modified by Philipp Löpmeier (replacing deprecated classes and methods, using generic types) 
    */ 
    public class Util { 

     public static void copySheets(HSSFSheet newSheet, HSSFSheet sheet){ 
      copySheets(newSheet, sheet, true); 
     } 

     public static void copySheets(HSSFSheet newSheet, HSSFSheet sheet, boolean copyStyle){ 
      int maxColumnNum = 0; 
      Map<Integer, HSSFCellStyle> styleMap = (copyStyle) ? new HashMap<Integer, HSSFCellStyle>() : null; 
      for (int i = sheet.getFirstRowNum(); i <= sheet.getLastRowNum(); i++) { 
       HSSFRow srcRow = sheet.getRow(i); 
       HSSFRow destRow = newSheet.createRow(i); 
       if (srcRow != null) { 
        Util.copyRow(sheet, newSheet, srcRow, destRow, styleMap); 
        if (srcRow.getLastCellNum() > maxColumnNum) { 
         maxColumnNum = srcRow.getLastCellNum(); 
        } 
       } 
      } 
      for (int i = 0; i <= maxColumnNum; i++) { 
       newSheet.setColumnWidth(i, sheet.getColumnWidth(i)); 
      } 
     } 

     public static void copyRow(HSSFSheet srcSheet, HSSFSheet destSheet, HSSFRow srcRow, HSSFRow destRow, Map<Integer, HSSFCellStyle> styleMap) { 
      Set<CellRangeAddress> mergedRegions = new TreeSet<CellRangeAddress>(); 
      destRow.setHeight(srcRow.getHeight()); 
      for (int j = srcRow.getFirstCellNum(); j <= srcRow.getLastCellNum(); j++) { 
       HSSFCell oldCell = srcRow.getCell(j); 
       HSSFCell newCell = destRow.getCell(j); 
       if (oldCell != null) { 
        if (newCell == null) { 
         newCell = destRow.createCell(j); 
        } 
        copyCell(oldCell, newCell, styleMap); 
        CellRangeAddress mergedRegion = getMergedRegion(srcSheet, srcRow.getRowNum(), (short)oldCell.getColumnIndex()); 
        if (mergedRegion != null) { 
         CellRangeAddress newMergedRegion = new CellRangeAddress(mergedRegion.getFirstRow(), mergedRegion.getFirstColumn(), mergedRegion.getLastRow(), mergedRegion.getLastColumn()); 
         if (isNewMergedRegion(newMergedRegion, mergedRegions)) { 
          mergedRegions.add(newMergedRegion); 
          destSheet.addMergedRegion(newMergedRegion); 
         } 
        } 
       } 
      } 

     } 

     public static void copyCell(HSSFCell oldCell, HSSFCell newCell, Map<Integer, HSSFCellStyle> styleMap) { 
      if(styleMap != null) { 
       if(oldCell.getSheet().getWorkbook() == newCell.getSheet().getWorkbook()){ 
        newCell.setCellStyle(oldCell.getCellStyle()); 
       } else{ 
        int stHashCode = oldCell.getCellStyle().hashCode(); 
        HSSFCellStyle newCellStyle = styleMap.get(stHashCode); 
        if(newCellStyle == null){ 
         newCellStyle = newCell.getSheet().getWorkbook().createCellStyle(); 
         newCellStyle.cloneStyleFrom(oldCell.getCellStyle()); 
         styleMap.put(stHashCode, newCellStyle); 
        } 
        newCell.setCellStyle(newCellStyle); 
       } 
      } 
      switch(oldCell.getCellType()) { 
       case HSSFCell.CELL_TYPE_STRING: 
        newCell.setCellValue(oldCell.getStringCellValue()); 
        break; 
       case HSSFCell.CELL_TYPE_NUMERIC: 
        newCell.setCellValue(oldCell.getNumericCellValue()); 
        break; 
       case HSSFCell.CELL_TYPE_BLANK: 
        newCell.setCellType(HSSFCell.CELL_TYPE_BLANK); 
        break; 
       case HSSFCell.CELL_TYPE_BOOLEAN: 
        newCell.setCellValue(oldCell.getBooleanCellValue()); 
        break; 
       case HSSFCell.CELL_TYPE_ERROR: 
        newCell.setCellErrorValue(oldCell.getErrorCellValue()); 
        break; 
       case HSSFCell.CELL_TYPE_FORMULA: 
        newCell.setCellFormula(oldCell.getCellFormula()); 
        break; 
       default: 
        break; 
      } 

     } 

     public static CellRangeAddress getMergedRegion(HSSFSheet sheet, int rowNum, short cellNum) { 
      for (int i = 0; i < sheet.getNumMergedRegions(); i++) { 
       CellRangeAddress merged = sheet.getMergedRegion(i); 
       if (merged.isInRange(rowNum, cellNum)) { 
        return merged; 
       } 
      } 
      return null; 
     } 

     private static boolean isNewMergedRegion(CellRangeAddress newMergedRegion, Collection<CellRangeAddress> mergedRegions) { 
      return !mergedRegions.contains(newMergedRegion); 
     } 

    } 

http://www.coderanch.com/t/420958/open-source/Copying-sheet-excel-file-another