How to copy column data in excel by Apache poi? - apache-poi

Question

Does anybody know how to copy a existing column data into a new sheet in a excel file or a new workbook by Apache poi? The data type is double and date.

Answer 1

I attached the link below. They also provide mutiple different ways of doing it.
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