After a researching and trying, here my solution. I was tested with java 1.6 and apache-poi 3.8
here i wan't to provide the solution worked for me, special in this case, i pas a worksheet and a List of input streams (different workbooks i want to merge).
My solution is a merged one, i've got merged the whole sourcecode from here i want to share this code with everyone, stuck on the same problem.
/**
* Original version available from:
* http://www.coderanch.com/t/420958/open-source/Copying-sheet-excel-file-another
**/
import java.io.FileInputStream;
import java.io.IOException;
import java.util.List;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.WorkbookFactory;
import org.apache.poi.ss.util.CellRangeAddress;
public class CopySheets {
public Workbook mergeExcelFiles(Workbook book, List<InputStream> inList) throws IOException {
for (InputStream fin : inList) {
Workbook b = WorkbookFactory.create(fin);
for (int i = 0; i < b.getNumberOfSheets(); i++) {
// not entering sheet name, because of duplicated names
copySheets(book.createSheet(),b.getSheetAt(i));
}
}
return book;
}
/**
* @param newSheet the sheet to create from the copy.
* @param sheet the sheet to copy.
*/
public static void copySheets(Sheet newSheet, Sheet sheet){
copySheets(newSheet, sheet, true);
}
/**
* @param newSheet the sheet to create from the copy.
* @param sheet the sheet to copy.
* @param copyStyle true copy the style.
*/
public static void copySheets(Sheet newSheet, Sheet sheet, boolean copyStyle){
int maxColumnNum = 0;
Map<Integer, CellStyle> styleMap = (copyStyle) ? new HashMap<Integer, CellStyle>() : null;
for (int i = sheet.getFirstRowNum(); i <= sheet.getLastRowNum(); i++) {
Row srcRow = sheet.getRow(i);
Row destRow = newSheet.createRow(i);
if (srcRow != null) {
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));
}
}
/**
* @param srcSheet the sheet to copy.
* @param destSheet the sheet to create.
* @param srcRow the row to copy.
* @param destRow the row to create.
* @param styleMap -
*/
public static void copyRow(Sheet srcSheet, Sheet destSheet, Row srcRow, Row destRow, Map<Integer, CellStyle> styleMap) {
// manage a list of merged zone in order to not insert two times a merged zone
Set<CellRangeAddressWrapper> mergedRegions = new TreeSet<CellRangeAddressWrapper>();
destRow.setHeight(srcRow.getHeight());
// reckoning delta rows
int deltaRows = destRow.getRowNum()-srcRow.getRowNum();
// pour chaque row
for (int j = srcRow.getFirstCellNum(); j <= srcRow.getLastCellNum(); j++) {
Cell oldCell = srcRow.getCell(j); // ancienne cell
Cell newCell = destRow.getCell(j); // new cell
if (oldCell != null) {
if (newCell == null) {
newCell = destRow.createCell(j);
}
// copy chaque cell
copyCell(oldCell, newCell, styleMap);
// copy les informations de fusion entre les cellules
//System.out.println("row num: " + srcRow.getRowNum() + " , col: " + (short)oldCell.getColumnIndex());
CellRangeAddress mergedRegion = getMergedRegion(srcSheet, srcRow.getRowNum(), (short)oldCell.getColumnIndex());
if (mergedRegion != null) {
//System.out.println("Selected merged region: " + mergedRegion.toString());
CellRangeAddress newMergedRegion = new CellRangeAddress(mergedRegion.getFirstRow()+deltaRows, mergedRegion.getLastRow()+deltaRows, mergedRegion.getFirstColumn(), mergedRegion.getLastColumn());
//System.out.println("New merged region: " + newMergedRegion.toString());
CellRangeAddressWrapper wrapper = new CellRangeAddressWrapper(newMergedRegion);
if (isNewMergedRegion(wrapper, mergedRegions)) {
mergedRegions.add(wrapper);
destSheet.addMergedRegion(wrapper.range);
}
}
}
}
}
/**
* @param oldCell
* @param newCell
* @param styleMap
*/
public static void copyCell(Cell oldCell, Cell newCell, Map<Integer, CellStyle> styleMap) {
if(styleMap != null) {
if(oldCell.getSheet().getWorkbook() == newCell.getSheet().getWorkbook()){
newCell.setCellStyle(oldCell.getCellStyle());
} else{
int stHashCode = oldCell.getCellStyle().hashCode();
CellStyle 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 Cell.CELL_TYPE_STRING:
newCell.setCellValue(oldCell.getStringCellValue());
break;
case Cell.CELL_TYPE_NUMERIC:
newCell.setCellValue(oldCell.getNumericCellValue());
break;
case Cell.CELL_TYPE_BLANK:
newCell.setCellType(HSSFCell.CELL_TYPE_BLANK);
break;
case Cell.CELL_TYPE_BOOLEAN:
newCell.setCellValue(oldCell.getBooleanCellValue());
break;
case Cell.CELL_TYPE_ERROR:
newCell.setCellErrorValue(oldCell.getErrorCellValue());
break;
case Cell.CELL_TYPE_FORMULA:
newCell.setCellFormula(oldCell.getCellFormula());
break;
default:
break;
}
}
/**
* Récupère les informations de fusion des cellules dans la sheet source pour les appliquer
* à la sheet destination...
* Récupère toutes les zones merged dans la sheet source et regarde pour chacune d'elle si
* elle se trouve dans la current row que nous traitons.
* Si oui, retourne l'objet CellRangeAddress.
*
* @param sheet the sheet containing the data.
* @param rowNum the num of the row to copy.
* @param cellNum the num of the cell to copy.
* @return the CellRangeAddress created.
*/
public static CellRangeAddress getMergedRegion(Sheet 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;
}
/**
* Check that the merged region has been created in the destination sheet.
* @param newMergedRegion the merged region to copy or not in the destination sheet.
* @param mergedRegions the list containing all the merged region.
* @return true if the merged region is already in the list or not.
*/
private static boolean isNewMergedRegion(CellRangeAddressWrapper newMergedRegion, Set<CellRangeAddressWrapper> mergedRegions) {
return !mergedRegions.contains(newMergedRegion);
}
}
class CellRangeAddressWrapper implements Comparable<CellRangeAddressWrapper> {
public CellRangeAddress range;
/**
* @param theRange the CellRangeAddress object to wrap.
*/
public CellRangeAddressWrapper(CellRangeAddress theRange) {
this.range = theRange;
}
/**
* @param o the object to compare.
* @return -1 the current instance is prior to the object in parameter, 0: equal, 1: after...
*/
public int compareTo(CellRangeAddressWrapper o) {
if (range.getFirstColumn() < o.range.getFirstColumn()
&& range.getFirstRow() < o.range.getFirstRow()) {
return -1;
} else if (range.getFirstColumn() == o.range.getFirstColumn()
&& range.getFirstRow() == o.range.getFirstRow()) {
return 0;
} else {
return 1;
}
}
}
