Develop Reference

XSSFWorkbook cloneSheet corrupts workbook if sheet contains a table

I want to clone an Excel sheet and all of its contents. I tried the XSSFWorkbook cloneSheet method, but it seems the workbook is corrupted if my sheet contains an Excel table. See the examle workbook below with a simple table:
When I try to open the output workbook, I get a prompt telling me that the file is broken and needs to be repaired. If I recover the workbook, it is clear the table has not been copied correctly; the original totals row is now a data row.
try (InputStream is = Table.class.getResourceAsStream("table.xlsx")) {
XSSFWorkbook workbook = new XSSFWorkbook(is);
workbook.cloneSheet(0, "Test");
try (OutputStream fileOut = new FileOutputStream("table-2.xlsx")) {
workbook.write(fileOut);
}
} catch (IOException e) {
e.printStackTrace();
}
How I would go about copying this sheet? Any help is appreciated!

XSSFWorkbook.cloneSheet clones a sheet. But it does not considering the possible defined tables in it. It simply clones the table references. But two table-ranges in sheets cannot refer to the same table reference. The tables itself needs to be cloned. That's why the corrupted workbook as result.
I've tried to solve this by programming a method cloneTables(XSSFSheet sheet) which simply creates clones of each table in a sheet which then refer to their own table reference each. I consider table styles, auto-filter, a totals-row and calculated column formulas. I hope I have not overlooked something, but I doubt that.
The code its tested and works using current apache poi 5.2.2.
It contains fixes for following bugs too:
XSSFTable.updateHeaders fails in Excel workbooks created using current Excel versions. This is because of the test row.getCTRow().validate() which always will be false because of the usage of new name spaces. See Renaming headers of XSSFTable with Apache Poi leads to corrupt XLSX-file.
XSSFSheet.removeTable does not remove the links to the table part reference from the sheet.
Complete example to test:
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.*;
import org.apache.poi.ss.util.*;
import org.apache.poi.ss.SpreadsheetVersion;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTTableColumn;
class ExcelCloneSheetHavingTable {
static void updateHeaders(XSSFTable table) {
XSSFSheet sheet = (XSSFSheet)table.getParent();
CellReference ref = table.getStartCellReference();
if (ref == null) return;
int headerRow = ref.getRow();
int firstHeaderColumn = ref.getCol();
XSSFRow row = sheet.getRow(headerRow);
DataFormatter formatter = new DataFormatter();
if (row != null /*&& row.getCTRow().validate()*/) { // see bug: https://stackoverflow.com/questions/55532006/renaming-headers-of-xssftable-with-apache-poi-leads-to-corrupt-xlsx-file/55539181#55539181
int cellnum = firstHeaderColumn;
org.openxmlformats.schemas.spreadsheetml.x2006.main.CTTableColumns ctTableColumns = table.getCTTable().getTableColumns();
if(ctTableColumns != null) {
for (org.openxmlformats.schemas.spreadsheetml.x2006.main.CTTableColumn col : ctTableColumns.getTableColumnList()) {
XSSFCell cell = row.getCell(cellnum);
if (cell != null) {
String colName = formatter.formatCellValue(cell);
colName = colName.replace("\n", "_x000a_");
colName = colName.replace("\r", "_x000d_");
col.setName(colName);
}
cellnum++;
}
}
}
//tableColumns = null;
//columnMap = null;
//xmlColumnPrs = null;
//commonXPath = null;
try {
java.lang.reflect.Field tableColumns = XSSFTable.class.getDeclaredField("tableColumns");
tableColumns.setAccessible(true);
tableColumns.set(table, null);
java.lang.reflect.Field columnMap = XSSFTable.class.getDeclaredField("columnMap");
columnMap.setAccessible(true);
columnMap.set(table, null);
java.lang.reflect.Field xmlColumnPrs = XSSFTable.class.getDeclaredField("xmlColumnPrs");
xmlColumnPrs.setAccessible(true);
xmlColumnPrs.set(table, null);
java.lang.reflect.Field commonXPath = XSSFTable.class.getDeclaredField("commonXPath");
commonXPath.setAccessible(true);
commonXPath.set(table, null);
} catch (Exception ex) {
ex.printStackTrace();
}
}
static String getSubtotalFormulaStartFromTotalsRowFunction(int intTotalsRowFunction) {
final int INT_NONE = 1;
final int INT_SUM = 2;
final int INT_MIN = 3;
final int INT_MAX = 4;
final int INT_AVERAGE = 5;
final int INT_COUNT = 6;
final int INT_COUNT_NUMS = 7;
final int INT_STD_DEV = 8;
final int INT_VAR = 9;
final int INT_CUSTOM = 10;
String subtotalFormulaStart = null;
switch (intTotalsRowFunction) {
case INT_NONE:
subtotalFormulaStart = null;
break;
case INT_SUM:
subtotalFormulaStart = "SUBTOTAL(109";
break;
case INT_MIN:
subtotalFormulaStart = "SUBTOTAL(105";
break;
case INT_MAX:
subtotalFormulaStart = "SUBTOTAL(104";
break;
case INT_AVERAGE:
subtotalFormulaStart = "SUBTOTAL(101";
break;
case INT_COUNT:
subtotalFormulaStart = "SUBTOTAL(103";
break;
case INT_COUNT_NUMS:
subtotalFormulaStart = "SUBTOTAL(102";
break;
case INT_STD_DEV:
subtotalFormulaStart = "SUBTOTAL(107";
break;
case INT_VAR:
subtotalFormulaStart = "SUBTOTAL(110";
break;
case INT_CUSTOM:
subtotalFormulaStart = null;
break;
default:
subtotalFormulaStart = null;
}
return subtotalFormulaStart;
}
static void cloneTables(XSSFSheet sheet) {
for (XSSFTable table : sheet.getTables()) {
// clone table; XSSFTable.setArea fails and throws exception for too small tables
XSSFTable clonedTable = null;
int rowCount = (table.getArea().getLastCell().getRow() - table.getArea().getFirstCell().getRow()) + 1;
int headerRowCount = table.getHeaderRowCount(); if (headerRowCount == 0) headerRowCount = 1;
int minimumRowCount = 1 + headerRowCount + table.getTotalsRowCount();
if (rowCount >= minimumRowCount) {
clonedTable = sheet.createTable(table.getArea());
}
if (clonedTable != null) {
//clonedTable.updateHeaders(); // don't work, see bug: https://stackoverflow.com/questions/55532006/renaming-headers-of-xssftable-with-apache-poi-leads-to-corrupt-xlsx-file/55539181#55539181
updateHeaders(clonedTable);
// clone style
clonedTable.setStyleName(table.getStyleName());
XSSFTableStyleInfo style = (XSSFTableStyleInfo)table.getStyle();
XSSFTableStyleInfo clonedStyle = (XSSFTableStyleInfo)clonedTable.getStyle();
if (style != null && clonedStyle != null) {
clonedStyle.setShowColumnStripes(style.isShowColumnStripes());
clonedStyle.setShowRowStripes(style.isShowRowStripes());
clonedStyle.setFirstColumn(style.isShowFirstColumn());
clonedStyle.setLastColumn(style.isShowLastColumn());
}
//clone autofilter
clonedTable.getCTTable().setAutoFilter(table.getCTTable().getAutoFilter());
//clone totalsrow
int totalsRowCount = table.getTotalsRowCount();
if (totalsRowCount == 1) { // never seen more than one totals row
XSSFRow totalsRow = sheet.getRow(clonedTable.getEndCellReference().getRow());
if (clonedTable.getCTTable().getTableColumns().getTableColumnList().size() > 0) {
clonedTable.getCTTable().setTotalsRowCount(totalsRowCount);
for (int i = 0; i < clonedTable.getCTTable().getTableColumns().getTableColumnList().size(); i++) {
org.openxmlformats.schemas.spreadsheetml.x2006.main.CTTableColumn tableCol = table.getCTTable().getTableColumns().getTableColumnList().get(i);
org.openxmlformats.schemas.spreadsheetml.x2006.main.CTTableColumn clonedTableCol = clonedTable.getCTTable().getTableColumns().getTableColumnList().get(i);
clonedTableCol.setTotalsRowFunction(tableCol.getTotalsRowFunction());
int intTotalsRowFunction = clonedTableCol.getTotalsRowFunction().intValue();
sheet.getWorkbook().setCellFormulaValidation(false);
if (intTotalsRowFunction == 10) { //custom
org.openxmlformats.schemas.spreadsheetml.x2006.main.CTTableFormula totalsRowFormula = tableCol.getTotalsRowFormula();
clonedTableCol.setTotalsRowFormula(totalsRowFormula);
totalsRow.getCell(clonedTable.getStartCellReference().getCol()+i).setCellFormula(totalsRowFormula.getStringValue());
} else if (intTotalsRowFunction == 1) { //none
//totalsRow.getCell(clonedTable.getStartCellReference().getCol()+i).setBlank();
} else {
String subtotalFormulaStart = getSubtotalFormulaStartFromTotalsRowFunction(intTotalsRowFunction);
if (subtotalFormulaStart != null)
totalsRow.getCell(clonedTable.getStartCellReference().getCol()+i).setCellFormula(subtotalFormulaStart + "," + clonedTable.getName() +"[" + clonedTableCol.getName()+ "])");
}
}
}
}
// clone calculated column formulas
if (clonedTable.getCTTable().getTableColumns().getTableColumnList().size() > 0) {
clonedTable.getCTTable().setTotalsRowCount(totalsRowCount);
for (int i = 0; i < clonedTable.getCTTable().getTableColumns().getTableColumnList().size(); i++) {
org.openxmlformats.schemas.spreadsheetml.x2006.main.CTTableColumn tableCol = table.getCTTable().getTableColumns().getTableColumnList().get(i);
org.openxmlformats.schemas.spreadsheetml.x2006.main.CTTableColumn clonedTableCol = clonedTable.getCTTable().getTableColumns().getTableColumnList().get(i);
if (tableCol.getCalculatedColumnFormula() != null) {
clonedTableCol.setCalculatedColumnFormula(tableCol.getCalculatedColumnFormula());
org.openxmlformats.schemas.spreadsheetml.x2006.main.CTTableFormula calculatedColumnFormula = clonedTableCol.getCalculatedColumnFormula();
String formula = tableCol.getCalculatedColumnFormula().getStringValue();
String clonedFormula = formula.replace(table.getName(), clonedTable.getName());
calculatedColumnFormula.setStringValue(clonedFormula);
int rFirst = clonedTable.getStartCellReference().getRow() + clonedTable.getHeaderRowCount();
int rLast = clonedTable.getEndCellReference().getRow() - clonedTable.getTotalsRowCount();
int c = clonedTable.getStartCellReference().getCol() + i;
sheet.getWorkbook().setCellFormulaValidation(false);
for (int r = rFirst; r <= rLast; r++) {
XSSFRow row = sheet.getRow(r); if (row == null) row = sheet.createRow(r);
XSSFCell cell = row.getCell(c); if (cell == null) cell = row.createCell(c);
cell.setCellFormula(clonedFormula);
}
}
}
}
}
// remove old table; do that even if XSSFsheet.createTable failed, because a one-cell-table doesn't make any sense
String rId = sheet.getRelationId(table);
sheet.removeTable(table);
// remove links to the table part reference
org.openxmlformats.schemas.spreadsheetml.x2006.main.CTTableParts tblParts = sheet.getCTWorksheet().getTableParts();
if (tblParts != null && tblParts.getTablePartList().size() > 0) {
for (int i = 0; i < tblParts.getTablePartList().size(); i++) {
org.openxmlformats.schemas.spreadsheetml.x2006.main.CTTablePart tblPart = tblParts.getTablePartArray​(i);
if(tblPart.getId().equals(rId)) {
tblParts.removeTablePart​(i);
}
}
}
}
}
public static void main(String[] args) throws Exception {
try (Workbook workbook = WorkbookFactory.create(new FileInputStream("SAMPLE.xlsx"));
FileOutputStream out = new FileOutputStream("SAMPLE_NEW.xlsx")) {
XSSFSheet sheet = ((XSSFWorkbook)workbook).cloneSheet(0, "Test");
cloneTables(sheet);
workbook.write(out);
}
}
}
This code needs the full jar of all of the schemas, which is poi-ooxml-full-5.2.2.jar for apache poi 5.2.2, as mentioned in FAQ. Note, since apache poi 5.* the formerly used ooxml-schemas-*.jar cannot be used anymore. There must not be any ooxml-schemas-*.jar in class path when using apache poi 5.*.
Note, you need this additional. The file names poi-ooxml-5.2.2.jar and poi-ooxml-lite-5.2.2.jar respective poi-ooxml-full-5.2.2.jar are misleading. The *-lite*.jar respective *-full*.jar do not replace, but complement the poi-ooxml-5.2.2.jar.

Java POI edit excel file - cell.setCellValue not working

I'm trying to modify an excel file but for some reason which I do not understand the method Cell.setCellValue does not work in my code.
What I'm actually doing is:
-I'm opening an excel file and saving the content that interests me in a HashMap. This works i can print the content of the hashmap.
-Then I'm trying to modify another excel file with the data saved in the HashMap but this does not happen for some reason.
Here is my code:
public File manipulateDocumentITM(File xlFile) {
// ADDING DATA FROM AN EXCEL FILE TO A HASHMAP
HashMap<Integer, ArrayList<Date>> hashMap = new HashMap<>();
try {
FileInputStream inFile = new FileInputStream(xlFile);
Workbook workbookInFile = new XSSFWorkbook(inFile);
Sheet sheetInFile = workbookInFile.getSheetAt(0);
Iterator<Row> rowIteratorInFile = sheetInFile.iterator();
int rowCountInFile = 5, key = 0, countEmpty = 0, rowCountModelFile = 10;
while (rowIteratorInFile.hasNext()) {
ArrayList<Date> arrayList = new ArrayList<>();
Row rowInFile = rowIteratorInFile.next();
if (rowInFile.getRowNum() == rowCountInFile) {
key++;
Iterator<Cell> cellIteratorInFile = rowInFile.cellIterator();
arrayList = new ArrayList<>();
while (cellIteratorInFile.hasNext()) {
Cell cell = cellIteratorInFile.next();
if ((cell.getCellType() == CellType.NUMERIC) && (cell.getColumnIndex() != 0)) {
Date data = cell.getDateCellValue();
arrayList.add(data);
}
}
hashMap.put(key, arrayList);
rowCountInFile = rowCountInFile + 4;
}
}
inFile.close();
// DATA SAVED IN HASHMAP ABOVE NEXT IM JUST PRINTING THE VALUES IN THE HASHMAP
for (Integer I : hashMap.keySet()) {
ArrayList<Date> replaceArray = hashMap.get(I);
System.out.println("***");
for (int i = 0; i < replaceArray.size(); i++) {
System.out.println(replaceArray.get(i).getHours());
}
}
// CODE THAT SUPPOSE TO MODIFY EXCEL FILE WITH THE DATA FROM THE HASHMAP
String modelPath = "/home/h1dr0/Documents/unimineral/Model foaie de prezenta (another copy).xlsx";
FileInputStream modelFile = new FileInputStream(modelPath);
Workbook workbookModel = new XSSFWorkbook(modelFile);
Sheet sheetModelFile = workbookModel.getSheetAt(0);
Iterator<Row> rowIteratorModelFile = sheetModelFile.iterator();
ArrayList<Date> replaceArray2 = new ArrayList<>();
Iterator it = hashMap.entrySet().iterator();
while (rowIteratorModelFile.hasNext()) {
Row rowModelFile = rowIteratorModelFile.next();
if (rowModelFile.getRowNum() == rowCountModelFile) {
Iterator<Cell> cellIteratorModelFile = rowModelFile.cellIterator();
Map.Entry pair = (Map.Entry)it.next();
replaceArray2 = (ArrayList<Date>) pair.getValue();
while (cellIteratorModelFile.hasNext()) {
Cell cell = cellIteratorModelFile.next();
if (replaceArray2.size() != 0) {
for (int i = 0; i < replaceArray2.size(); i++) {
if ((replaceArray2.get(i).getHours() != 0) && replaceArray2.get(i).toString() != "" && (cell.getColumnIndex() != 18)) {
// THIS DOES NOT WORK
cell.setCellValue(replaceArray2.get(i).getHours());
}
else {
cell.setCellValue(" ");
}
}
} else {
cell.setCellValue(" ");
}
}
rowCountModelFile = rowCountModelFile + 3;
}
}
modelFile.close();
//}
FileOutputStream outputStream = new FileOutputStream("/home/h1dr0/Documents/unimineral/generate.xlsx",false);
workbookModel.write(outputStream);
outputStream.close();
}
catch (Exception e)
{
e.printStackTrace();
}
return xlFile;
}
I also checked with debugger and the cell values are modified to what it suppose to...
cell.setCellValue(8);
if(cell.getCellType() == CellType.NUMERIC) {
System.out.println("cell: " + cell.getNumericCellValue());
}
prints 8
What i get is the same file .. no modification.
Please help , thank you !

Excel is designed to work on huge tables. Only the used ones are stored in memory or the document. That means before you can populate a cell, it first has to be created.
In your code I only see that you iterate over the existing cells but you do not try to create them. Maybe that is the issue?

I decided to try another approach in modifying excel files. I'm using UIPath for automation. It works good I managed to do this by using their excel activity dependencies in Studio ( their IDE let's say ).

Apache POI - Reading excel file in 2D array - returning null values

I am trying to read Excel -2*2 matrix through Apache POI. But the first value returned by 2D array is [null,null]. Please check my code and advise for suitable corrections.
public String[][] getDataArray(String sheetName)
{
String value ="";
String[][] data = null;
int rowCount = wb.getSheet(sheetName).getLastRowNum();
int colCount = wb.getSheet(sheetName).getRow(1).getLastCellNum()-1;
data = new String[rowCount][colCount];
for(int i=1; i<=rowCount;i++)
{
Row row = wb.getSheet(sheetName).getRow(i);
for(int j=0;j<colCount;j++)
{
Cell cell = row.getCell(j);
if(cell.getCellType()==Cell.CELL_TYPE_NUMERIC)
{
value = ""+cell.getStringCellValue();
}
else
{
value = cell.getStringCellValue();
}
data[i][j] = value;
}
}
return data;
}
The debug view where we can see that the first value stored in the variable data is null, null
The excel which i am trying to read. I need only the userName and password data(2*2) alone. Not the header and Run mode datas.

Of course the value in the index 0 will be null because the i starts from 1 and not 0
for (int i = 1; i <= rowCount; i++) //i starts from one
...
data[i][j] = value;
either initialize the i from 0 or do like this
data[i-1][j] = value;

public static String[][] getSheetData(final String fileName, final String workSheetName)
throws Exception {
Integer lastRow = null;
short lastCol = 0;
String[][] sheetData = null;
FileInputStream file=new FileInputStream(MettlTest.class.getClass().getResource("/" + fileName).getPath());
workbook = new XSSFWorkbook(file);
sheet = workbook.getSheet(workSheetName);
try {
XSSFRow row;
XSSFCell cell;
lastRow = sheet.getPhysicalNumberOfRows();
lastCol = sheet.getRow(1).getLastCellNum();
sheetData = new String[lastRow - 1][lastCol];
for (int r = 1; r < lastRow; r++) {
row = sheet.getRow(r);
if (row != null) {
for (int c = 0; c < lastCol; c++) {
cell = row.getCell(c);
if (cell == null) {
sheetData[r][c] = null;
} else {
sheetData[r-1][c] = new DataFormatter().formatCellValue(cell);
}
}
}
}
return sheetData;
}
catch (final Exception e) {
throw e;
}
finally {
try {
file.close();
} catch (IOException io) {
Reporter.log("Unable to close File : " + fileName);
throw io;
}
}

copy excel sheet(With charts) to another excel sheet

I am using APACHE POI 3.0 to add sheets to existing excel sheet. It works fine.
But as APACHE POI has limitations about making charts, I used a template excel file to create charts, which also worked fine, but this always result in new excel file.
If I have an existing excel sheet and I want to add a sheet, having charts, I am not able to do it. As, when I create charts, I use template file and it always makes a new excel file.
so I was wondering if there is any solution of it of adding sheets to excel, where the sheets have charts
public class TagBrowserSelection
{
private static String[] excelBarPlot_Template = { "","barPlot_1Panel_template.xlsx"};
private static String[] excelPieChart_Template = { "","pieChart_1Panel_template.xlsx"};
private static String[] excelPieAndBarPlot_Template = { "","pieAndBarChart_1Panel_template.xlsx"};
private static String REGEX = "";
static public boolean makeTagBrowserSelection(String strOutputFileName, ArrayList<TagBrowserChildPanel> childList, String sheetName, boolean addSheet, ArrayList<Boolean> chartAttributes)
{
// chart attributes
boolean addBarChart = chartAttributes.get(0);
boolean addPieChart = chartAttributes.get(1);
boolean addNoTag = chartAttributes.get(2);
boolean addZeros = chartAttributes.get(3);
REGEX = "^" + sheetName;
Pattern p = Pattern.compile(REGEX);
String[] templateArray = null;
if (addBarChart && addPieChart)
templateArray = excelPieAndBarPlot_Template;
else if (addBarChart)
templateArray = excelBarPlot_Template;
else if (addPieChart)
templateArray = excelPieChart_Template;
try
{
int number = childList.size();
XSSFWorkbook workbook = null;
XSSFWorkbook wb = null;
XSSFSheet sheet = null;
int col_num = 0;
int row_num = 0;
XSSFRow row = null;
XSSFCell cell = null;
// if adding sheet to existing excel file
if (addSheet)
{
FileInputStream fis = new FileInputStream(new File(strOutputFileName));
workbook = new XSSFWorkbook(fis);
fis.close();
// number of existing sheets in excel file
int numberOfSheets = workbook.getNumberOfSheets();
// check is sheetName exists already
if (isSheetExist(sheetName, workbook))
{
int counter = 1;
for (int ii = 0; ii < numberOfSheets; ii++)
{
Matcher m = p.matcher(workbook.getSheetName(ii));
if (m.find())
counter++;
}
sheetName = sheetName + " (" + counter + ")";
}
}
else
{
workbook = new XSSFWorkbook();
}
======================================================================
// if template file needs to be used(if bar chart/pie chart option is selected)
if (templateArray != null)
{
InputStream is = TagBrowserSelection.class.getClassLoader().getResourceAsStream(templateArray[number]);
wb = new XSSFWorkbook(OPCPackage.open(is));
sheet = wb.getSheetAt(0);
// wb.close();
}
else
{
sheet = workbook.createSheet(sheetName);
}
// Freeze top two row
// sheet.createFreezePane(0, 1, 0, 1);
// Filling up the workbook and performing the row/column formatting
for (TagBrowserChildPanel child : childList)
{
// Check if row is already created before(previous tag category)
row = sheet.getRow(0);
if (row == null)
row = sheet.createRow(0);
// Adding tag category name as header
String tagCategory = child.getSelectedCategory().getName();
cell = row.createCell(col_num);
cell.setCellValue(tagCategory);
row = sheet.getRow(1);
if (row == null)
row = sheet.createRow(1);
// Adding column headers
cell = row.createCell(col_num);
cell.setCellValue("tag");
cell = row.createCell(col_num + 1);
cell.setCellValue("counts");
row_num = 2;
// Adding tag category document summary(name and counts)
ArrayList<TagSummaryItem> tagSummary = child.getTagChartCounts();
for (int i = 0; i < tagSummary.size(); i++)
{
// Check if row is already created before(previous tag category)
row = sheet.getRow(row_num);
if (row == null)
row = sheet.createRow(row_num);
cell = row.createCell(col_num);
if (!addNoTag)
{
if (tagSummary.get(i).m_strTag == "[No Tag]")
continue;
}
if (!addZeros)
{
if (tagSummary.get(i).m_nCount == 0)
continue;
}
cell.setCellValue(tagSummary.get(i).m_strTag);
cell = row.createCell(col_num + 1);
cell.setCellValue(tagSummary.get(i).m_nCount);
row_num++;
}
// auto-size of tag column
sheet.autoSizeColumn(col_num);
col_num = col_num + 3;
}
FileOutputStream out = new FileOutputStream(strOutputFileName);
if (templateArray != null)
{
wb.setSheetName(0, sheetName);
wb.write(out);
wb.close();
}
else
{
workbook.write(out);
workbook.close();
}
out.close();
}
catch (Exception e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
return true;
}
Above is my code, its one code. I split into two sections. Section is the one which uses template to make chart excel sheet.

there's the method cloneSheet() in the HSSFWorkbook class. Try it.

Excel creation with POI

I was using Apache POI 3.7 to create Excel with HSSF. It was working fine. But during load test, I realized that it is very slow. So I Googled and found I can use SXSSF. I changed my existing code to XSSF. The result was awesome.
But I stuck with a situation, autorezisecolum() is not functioning as expected. It displays large contents as #####, because the column width shrinks. I found it is a kind of a bug already raised.
Now my point is, is there any solution so that i can use SXSSF(very important for performance) with a nice output.
Note: I am using Windows 7, JDK 1.7.09 , POI-3.10.beta-2
Please help me.
Here is my code :
Main Function :
sxssfWorkbook = new SXSSFWorkbook(5);
sxssfSheet = (SXSSFSheet) sxssfWorkbook.createSheet(sheetName);
try {
// TO Write Header
//ew.writeHeaderRow(sheet, headerNames);
ew.writeHeaderRow(sxssfSheet, headerNames);
int rowNum = headerRow + 1;
for(Map.Entry<String, List<Object>> columnData : columnDataMap.entrySet()){
ew.writeNonHeaderRow(sxssfSheet, columnData.getValue(), rowNum);
rowNum++;
}
resizeXLSXColumns(sxssfSheet,rowNum-1);
sxssfWorkbook.write(outputStream);
outputStream.close();
public void writeHeaderRow(Sheet sheet, List<String> headerNames ) {
//public void writeHeaderRow(SXSSFSheet sxssfSheet, List<String> headerNames ) {
// LinkedHashMap<String,Object> mp = getFieldNames(obj);
// ArrayList<String> colNames = (ArrayList<String>) getColumnNames();
try {
XSSFCellStyle hCellStyle = getHeaderStyle();
SXSSFRow row = (SXSSFRow) sheet.createRow(headerRow);
for (int hCellInd = 0; hCellInd < headerNames.size(); hCellInd++) {
SXSSFCell cell = (SXSSFCell) row.createCell(hCellInd);
cell.setCellStyle(hCellStyle);
cell.setCellValue(headerNames.get(hCellInd));
//sheet.autoSizeColumn(hCellInd);
}
} catch (Exception e) {
e.printStackTrace();
}
}
public void writeNonHeaderRow(SXSSFSheet sxssfSheet, List<Object> rowObj, int rowIndex)
{
CreationHelper createHelper = sxssfWorkbook.getCreationHelper();
try {
SXSSFRow row = (SXSSFRow)sheet.createRow(rowIndex);
XSSFCellStyle normalStyle = getNormalStyle();
int count = 0;
for (int rCellInd = 0; rCellInd < rowObj.size(); rCellInd++) {
//Cell cell = row.createCell(rCellInd);
SXSSFCell cell = (SXSSFCell)row.createCell(rCellInd);
cell.setCellStyle(normalStyle);
Object cellData = rowObj.get(rCellInd);
if (cellData != null) {
if (cellData instanceof Double) {
cell.setCellValue((Double) cellData);
if((Double)cellData < 0){
cell.setCellStyle(getNegativeValueStyle());
}else if((Double)cellData == 0){
normalStyle.setDataFormat((short) SXSSFCell.CELL_TYPE_BLANK) ;
cell.setCellStyle(normalStyle);
}else
cell.setCellStyle(normalStyle);
} else {
//normalStyle.setDataFormat((short) HSSFCell.CELL_TYPE_BLANK);
cell.setCellType(SXSSFCell.CELL_TYPE_BLANK);
}
//sxssfSheet.autoSizeColumn();
//sxssfSheet.setColumnWidth(rCellInd, sxssfSheet.getColumnWidth(rCellInd));
//resizeXLSXColumns(sheet);
}
//autoResizeColumns(sxssfSheet);
} catch (Exception e) {
e.printStackTrace();
}
}
public static void resizeXLSXColumns(Sheet sheet ,int rowNum){
SXSSFRow row = (SXSSFRow)sheet.getRow(rowNum);
Iterator<Cell> itr = row.cellIterator();
int max = 0;
while(itr.hasNext()){
Cell cell = itr.next();
int width = sheet.getColumnWidth(cell.getColumnIndex());
if(width > max){
max = width;
}
//sheet.setColumnWidth(cell.getColumnIndex(),max);
}
while(itr.hasNext()){
Cell cell = itr.next();
sheet.setColumnWidth(cell.getColumnIndex(),max);
}
}