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Apache POI - Excel Import, insert data from a new sheet into a column

I'm here to ask for help in my java project in Netbeans.
I'm using Apache POI to import/export excel data. To make you understand what is the problem in my application, I'm showing you a print of the debug.
In the print, you can see 2 sheets. The first header "aiai" and the data from that sheet.
My problem is: How do i insert the data from "aiai2" which is the second sheet from my excel file, in its proper place, below the header "aiai2"
On other words, I want to separate the sheets vertically.
Below, I will show my code:
Workbook wb;
public String Importar(File archivo, JTable tablaD) {
String answer = "Unable to import";
DefaultTableModel modeloT = new DefaultTableModel();
tablaD.setModel(modeloT);
tablaD.getModel();
tablaD.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
try {
wb = WorkbookFactory.create(new FileInputStream(archivo));
int nsheets = wb.getNumberOfSheets();
for (int i = 0; i < nsheets; i++) {
Sheet sheet = wb.getSheetAt(i);
Iterator filaIterator = sheet.rowIterator();
int rownum = -1;
while (filaIterator.hasNext()) {
rownum++;
Row fila = (Row) filaIterator.next();
/*if (i > 0) {//se o nr da ficha atual for maior que 0, começa a escrever as linhas apartir da row 0 da tabela
modeloT.moveRow(modeloT.getRowCount() -1, modeloT.getRowCount() - 1, 0);
}*/
Iterator columnaIterator = fila.cellIterator();
Object[] listaColumna = new Object[1000];
int columnnum = -1;
while (columnaIterator.hasNext()) {
columnnum++;
Cell celda = (Cell) columnaIterator.next();
if (rownum == 0) {
modeloT.addColumn(celda.getStringCellValue());
} else {
if (celda != null) {
switch (celda.getCellType()) {
case Cell.CELL_TYPE_NUMERIC:
listaColumna[columnnum] = (int) Math.round(celda.getNumericCellValue());
break;
case Cell.CELL_TYPE_STRING:
listaColumna[columnnum] = celda.getStringCellValue();
break;
case Cell.CELL_TYPE_BOOLEAN:
listaColumna[columnnum] = celda.getBooleanCellValue();
break;
default:
listaColumna[columnnum] = celda.getDateCellValue();
break;
}//end switch case
System.out.println("Column:" + columnnum + " Row:" + rownum + " value:" + celda + ".");
}
}
}//end while column Iterator
if (rownum != 0) {
modeloT.addRow(listaColumna);
}
}//end while row iterator
}//end for
answer = "Imported with success";
} catch (IOException | InvalidFormatException | EncryptedDocumentException e) {
System.err.println(e.getMessage());
}
return answer;
}
public String Exportar(File archivo, JTable tablaD) {
String answer = "Unable to export";
int numFila = tablaD.getRowCount(), numColumna = tablaD.getColumnCount();
if (archivo.getName().endsWith("xls")) {
wb = new HSSFWorkbook();
} else {
wb = new XSSFWorkbook();
}
Sheet hoja = wb.createSheet("Default");
try {
for (int i = -1; i < numFila; i++) {
Row fila = hoja.createRow(i + 1);
for (int j = 0; j < numColumna; j++) {
Cell celda = fila.createCell(j);
if (i == -1) {
celda.setCellValue(String.valueOf(tablaD.getColumnName(j)));
} else {
celda.setCellValue(String.valueOf(tablaD.getValueAt(i, j)));
}
wb.write(new FileOutputStream(archivo));
}
}
answer = "Exported with success";
} catch (Exception e) {
System.err.println(e.getMessage());
}
return answer;
}

As I understand your question, I assume you want to create a separate table for each sheet, one below other. In that case you need to create a new table everytime you read a new sheet. If you use only one table, you will get only one header.
Try this :
Create a new method Importar that takes a new table and a Sheet parameter
public String Importar(JTable tablaD, Sheet sheet) {
String answer = "Unable to import";
DefaultTableModel modeloT = new DefaultTableModel();
tablaD.setModel(modeloT);
tablaD.getModel();
tablaD.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
try {
Iterator filaIterator = sheet.rowIterator();
int rownum = -1;
....
....
So the calling method would be :
try {
Workbook wb = WorkbookFactory.create(new FileInputStream(archivo));
int nsheets = wb.getNumberOfSheets();
for (int i = 0; i < nsheets; i++) {
//You have to make sure your JTable gets rendered.
JTable tablaD = new JTable();
Importar( tablaD, wb.getSheetAt(i) );
}
} catch ( Exception e ) {
e.printStackTrace();
}
Important point is that your new table needs to get rendered or added to frame each time before you call Importar

Excel rows with multiple lines in one

I've created a Workbook to show an excel with different contents. That excel has some rows that contain some lines each. The problem is the excel only has that format when I click in a specific row and I want the entire excel looks like that.
This is my code:
Workbook worbook = new HSSFWorkbook();
Sheet sheet = worbook.createSheet("Publication List");
DateFormat df = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss");
Locale locale = resourceResponse.getLocale();
Font headerFont = worbook.createFont();
headerFont.setFontHeightInPoints((short) 11);
headerFont.setBoldweight(Font.BOLDWEIGHT_BOLD);
headerFont.setColor(new HSSFColor.DARK_BLUE().getIndex());
CellStyle headerStyle = worbook.createCellStyle();
headerStyle.setFont(headerFont);
headerStyle.setWrapText(true);
headerStyle.setFillPattern(CellStyle.SOLID_FOREGROUND);
headerStyle.setFillForegroundColor(new HSSFColor.GREY_25_PERCENT().getIndex());
try {
List < Country > countries = CountryServiceUtil.getCountries();
if (allRequests != null) {
int columnHeader = 0;
Row rowHead = sheet.createRow(0);
for (String headerColumn: header) {
Cell cell = rowHead.createCell(columnHeader);
cell.setCellValue(LanguageUtil.get(locale, headerColumn));
cell.setCellStyle(headerStyle);
columnHeader++;
}
int requestRow = 1;
for (PublicationRequest publication: allRequests) {
Row rowsBody = sheet.createRow(requestRow);
Country country = CountryServiceUtil.fetchCountryByA2(publication.getCountry());
String fullAddress = publication.getAddress() + StringPool.RETURN_NEW_LINE + publication.getCp() + StringPool.SPACE + publication.getCity() + StringPool.RETURN_NEW_LINE + country.getName();
rowsBody.createCell(8).setCellValue(fullAddress);
//Publication items. Cell 8
long scopeGroupId = PortalUtil.getScopeGroupId(resourceRequest);
List < PublicationRequestItem > allRequestItems = PublicationRequestItemLocalServiceUtil.findBypublicationRequestId(publication.getPublicationRequestId());
String publicationsVocabulary = PrefsParamUtil.getString(resourceRequest.getPreferences(), resourceRequest, "publicationsVocabulary", "");
AssetVocabulary publicationsTypeVocabulary = null;
if (Validator.isNotNull(publicationsVocabulary)) {
try {
publicationsTypeVocabulary = AssetVocabularyLocalServiceUtil.getAssetVocabularyByUuidAndGroupId(publicationsVocabulary, scopeGroupId);
String category = StringPool.BLANK;
for (PublicationRequestItem item: allRequestItems) {
JournalArticle latestArticle;
latestArticle = JournalArticleLocalServiceUtil.getLatestArticle(scopeGroupId, item.getArticleId());
if (!category.equals(StringPool.BLANK)) {
category = category + StringPool.NEW_LINE;
}
category += RequestDisplayUtil.getPublicationTitle(locale, latestArticle, publicationsTypeVocabulary);
}
rowsBody.createCell(9).setCellValue(category);
} catch (PortalException e) {
e.printStackTrace();
}
}
requestRow++;
}
for (int column = 0; column < columnHeader + 1; column++) {
sheet.autoSizeColumn(column);
}
}
} catch (SystemException e) {
_log.error("Error while creating Excel file", e);
} catch (PortalException e1) {
e1.printStackTrace();
}
resourceResponse.setContentType("application/vnd.ms-excel");
resourceResponse.setProperty("expires", "-1d");
resourceResponse.setProperty("Pragma", "no-cache");
resourceResponse.setProperty(HttpHeaders.CACHE_CONTROL, "no-cache");
I've tried as well with char(10) but I get the same end
Thank you

Finally I got a solution.
I only was giving styles to the header cells:
for (String headerColumn: header) {
Cell cell = rowHead.createCell(columnHeader);
cell.setCellValue(LanguageUtil.get(locale, headerColumn));
cell.setCellStyle(headerStyle);
columnHeader++;
I had to create the body cells previously and give it some style:
rowsBody.createCell(8).getCellStyle().setWrapText(true);
rowsBody.getCell(8).setCellValue(fullAddress);

Why can't set a value for a row and column with the Apache POI?

I need to set a value for a specific row and column of the spreadsheet, but I get a null pointer before even i = 1. I've tried changing the code but this error keeps happening and I have no more idea why.Does anyone have any idea why this happens?
My code
public Workbook build(Planilha planilha) {
File file = new File(TEMPLATE_PATH);
if (!file.exists()) {
Log.error(this, String.format("File %s not exists.", file.getAbsolutePath()));
throw new NotFoundException("File not exists.");
}
Workbook wb = null;
try (FileInputStream fs = new FileInputStream(file)) {
wb = new XSSFWorkbook(fs);
wb = writeMetadatas(planilha, wb);
Map<String, Integer> header = getHeader(wb);
Sheet sheet = wb.getSheetAt(0);
Row row;
Cell cell;
for (int i = 0; i <= 10; i++) {
row = sheet.getRow(i);
for (int j = 0; j <= 10; j++) {
cell = row.getCell(j, Row.CREATE_NULL_AS_BLANK);
if (cell.getColumnIndex() == 0 && row.getRowNum() == 7) {
cell.setCellValue("teste");
}
}
}
} catch (Exception e) {
Log.error(this, "Erro: Planilha não existe", e);
System.err.print("Erro");
}
String tmpDir = System.getProperty("java.io.tmpdir");
File f = FileUtil.file(PATH, System.currentTimeMillis() + ".xlsx");
try {
FileOutputStream fout = new FileOutputStream(f);
wb.write(fout);
fout.flush();
fout.close();
} catch (Exception e) {
Log.error(this, "Erro ao abrir arquivo p escrever.");
}
return wb;
}
**NullPointer happens in cell.setCellValue("teste");
I'm trying to set that cell

First, you can test if the row number is a certain number outside of your for loop that loops over the cells in a row. Pull that if outside your j for loop.
It looks like the Cell doesn't exist. row.getCell(j) is returning null.
You can use a MissingCellPolicy to determine whether you want to return a new Cell if the Cell doesn't already exist. The CREATE_NULL_AS_BLANK value will create a blank Cell for you if it doesn't already exist.

Create Multiple Sheet in jExcel API

I need to create multiple excel sheet in Java using jExcel API if one sheet is full (65536 rows). Suppose if one sheet got full then in the next sheet it should start writing automatically from where it left off in the first sheet. I am just stuck on putting the logic to create it dynamically whenever one sheet is full. Below is the code that I have done so far.
public void write() throws IOException, WriteException {
File file = new File(inputFile);
WorkbookSettings wbSettings = new WorkbookSettings();
wbSettings.setLocale(new Locale("en", "EN"));
WritableWorkbook workbook = Workbook.createWorkbook(file, wbSettings);
writingToExcel(workbook);
}
//Logic to create sheet dyanmically if one is full should be done here I guess?
private void writingToExcel(WritableWorkbook workbook) {
workbook.createSheet("Report", 0);
WritableSheet excelSheet = workbook.getSheet(0);
try {
createLabel(excelSheet);
createContent(excelSheet);
} catch (WriteException e) {
e.printStackTrace();
} finally {
try {
workbook.write();
workbook.close();
} catch (IOException e) {
e.printStackTrace();
} catch (WriteException e) {
e.printStackTrace();
}
}
}
private void createLabel(WritableSheet sheet) throws WriteException {
WritableFont times10pt = new WritableFont(WritableFont.TIMES, 10);
times = new WritableCellFormat(times10pt);
times.setWrap(true);
WritableFont times10ptBoldUnderline = new WritableFont(WritableFont.TIMES, 10, WritableFont.BOLD, false,UnderlineStyle.SINGLE);
timesBoldUnderline = new WritableCellFormat(times10ptBoldUnderline);
timesBoldUnderline.setWrap(true);
CellView cv = new CellView();
cv.setFormat(times);
cv.setFormat(timesBoldUnderline);
cv.setAutosize(true);
// Write a few headers
addCaption(sheet, 0, 0, "Header 1");
addCaption(sheet, 1, 0, "This is another header");
}
private void createContent(WritableSheet sheet) throws WriteException,
RowsExceededException {
for (int i = 1; i < 70000; i++) {
addNumber(sheet, 0, i, i + 10);
addNumber(sheet, 1, i, i * i);
}
}
private void addCaption(WritableSheet sheet, int column, int row, String s)
throws RowsExceededException, WriteException {
Label label;
label = new Label(column, row, s, timesBoldUnderline);
sheet.addCell(label);
}
private void addNumber(WritableSheet sheet, int column, int row,
Integer integer) throws WriteException, RowsExceededException {
Number number;
number = new Number(column, row, integer, times);
sheet.addCell(number);
}
I am not sure how to add that logic here in my code.
Any suggestions will be of great help?
Or in any case, can anyone provide me a simple example in which if one sheet is full, it should start writing automatically into different sheet (Second sheet)?

I made changes to the following 2 methods:-
private void writingToExcel(WritableWorkbook workbook) {
try {
// don't create a sheet now, instead, pass it in the workbook
createContent(workbook);
}
catch (WriteException e) {
e.printStackTrace();
}
finally {
try {
workbook.write();
workbook.close();
}
catch (IOException e) {
e.printStackTrace();
}
catch (WriteException e) {
e.printStackTrace();
}
}
}
// instead of taking a sheet, take a workbook because we cannot ensure if the sheet can fit all the content at this point
private void createContent(WritableWorkbook workbook) throws WriteException {
int excelSheetIndex = 0;
int rowIndex = 0;
WritableSheet excelSheet = null;
for (int i = 1; i < 70000; i++) {
// if the sheet has hit the cap, then create a new sheet, new label row and reset the row count
if (excelSheet == null || excelSheet.getRows() == 65536) {
excelSheet = workbook.createSheet("Report " + excelSheetIndex, excelSheetIndex++);
createLabel(excelSheet);
rowIndex = 0;
}
// instead of using i for row, use rowIndex
addNumber(excelSheet, 0, rowIndex, i + 10);
addNumber(excelSheet, 1, rowIndex, i * i);
// increment the sheet row
rowIndex++;
}
}

public class DscMigration {
private WritableCellFormat timesBoldUnderline;
private WritableCellFormat times;
private String inputFile;
public void setOutputFile(String inputFile) {
this.inputFile = inputFile;
}
public void write() throws IOException, WriteException {
File file = new File(inputFile);
WorkbookSettings wbSettings = new WorkbookSettings();
wbSettings.setLocale(new Locale("en", "EN"));
WritableWorkbook workbook = Workbook.createWorkbook(file, wbSettings);
workbook.createSheet("Report", 0);
WritableSheet excelSheet = workbook.getSheet(0);
createLabel(excelSheet);
createContent(excelSheet);
workbook.write();
workbook.close();
}
private void createLabel(WritableSheet sheet) throws WriteException {
// Lets create a times font
WritableFont times10pt = new WritableFont(WritableFont.TIMES, 10);
// Define the cell format
times = new WritableCellFormat(times10pt);
// Lets automatically wrap the cells
times.setWrap(true);
// Create create a bold font with unterlines
WritableFont times10ptBoldUnderline = new WritableFont(
WritableFont.TIMES, 10, WritableFont.BOLD, false,
UnderlineStyle.SINGLE);
timesBoldUnderline = new WritableCellFormat(times10ptBoldUnderline);
// Lets automatically wrap the cells
timesBoldUnderline.setWrap(true);
CellView cv = new CellView();
cv.setFormat(times);
// cv.setFormat(timesBoldUnderline);
// cv.setFormat(cf)
cv.setAutosize(true);
// Write a few headers
addCaption(sheet, 0, 0, "COM_ID");
addCaption(sheet, 1, 0, "OBJECTID");
addCaption(sheet, 2, 0, "GNOSISID");
}
private void createContent(WritableSheet sheet) throws WriteException,
RowsExceededException {
/**
* Create a new instance for cellDataList
*/
List<DataObj> cellDataListA = new ArrayList<DataObj>();
List<DataObj> nonDuplicateA = new ArrayList<DataObj>();
List<DataObj2> cellDataListB = new ArrayList<DataObj2>();
List<DataObj2> nonDuplicateB = new ArrayList<DataObj2>();
List<DataObj> nonDuplicateAB = new ArrayList<DataObj>();
List<DataObj> misMatchAB = new ArrayList<DataObj>();
List<DataObj> copyA = new ArrayList<DataObj>();
List<DataObj2> comID = new ArrayList<DataObj2>();
try {
/**
* Create a new instance for FileInputStream class
*/
// input1--> col1 -livelink id ; col2->livlink filename; col3-> gnosis id; col4-> filename
FileInputStream fileInputStream = new FileInputStream(
"C:/Documents and Settings/nithya/Desktop/DSC/Report/input1.xls");
//input2 --> col1 comid all, col2 -> object id for common
FileInputStream fileInputStream2 = new FileInputStream(
"C:/Documents and Settings/nithya/Desktop/DSC/Report/input2.xls");
/**
* Create a new instance for POIFSFileSystem class
*/
POIFSFileSystem fsFileSystem = new POIFSFileSystem(fileInputStream);
POIFSFileSystem fsFileSystem2 = new POIFSFileSystem(fileInputStream2);
/*
* Create a new instance for HSSFWorkBook Class
*/
HSSFWorkbook workBook = new HSSFWorkbook(fsFileSystem);
HSSFSheet hssfSheet = workBook.getSheetAt(0);
HSSFWorkbook workBook2 = new HSSFWorkbook(fsFileSystem2);
HSSFSheet hssfSheet2 = workBook2.getSheetAt(0);
/**
* Iterate the rows and cells of the spreadsheet to get all the
* datas.
*/
Iterator rowIterator = hssfSheet.rowIterator();
Iterator rowIterator2 = hssfSheet2.rowIterator();
while (rowIterator.hasNext()) {
HSSFRow hssfRow = (HSSFRow) rowIterator.next();
if ((hssfRow.getCell((short) 0) != null)
&& (hssfRow.getCell((short) 1) != null)) {
cellDataListA.add(new DataObj(hssfRow.getCell((short) 0)
.toString().trim(), hssfRow.getCell((short) 1)
.toString().trim()));
}
if ((hssfRow.getCell((short) 2) != null)
&& (hssfRow.getCell((short) 3) != null)) {
cellDataListB.add(new DataObj2(hssfRow.getCell((short) 2)
.toString().trim(), hssfRow.getCell((short) 3)
.toString().trim()));
}
}
// Replace Duplicate in Livelink Startd
Set set = new HashSet();
List newList = new ArrayList();
nonDuplicateA.addAll(cellDataListA);
for (int i = 0; i < nonDuplicateA.size(); i++) {
DataObj b = nonDuplicateA.get(i);
if (set.add(b.getCol1()))
newList.add(nonDuplicateA.get(i));
}
nonDuplicateA.clear();
nonDuplicateA.addAll(newList);
for (int i = 0; i < nonDuplicateA.size(); i++) {
DataObj a = nonDuplicateA.get(i);
}
System.out.println("nonDuplicateA=="+nonDuplicateA.size());
// Replace Duplicate in Livelink End
// Replace Duplicate in Gnosis Startd
Set set2 = new HashSet();
List newList2 = new ArrayList();
System.out.println("cellDataListB=="+cellDataListB.size());
nonDuplicateB.addAll(cellDataListB);
for (int i = 0; i < nonDuplicateB.size(); i++) {
DataObj2 b = nonDuplicateB.get(i);
if (set2.add(b.getCol1()))
newList2.add(nonDuplicateB.get(i));
}
nonDuplicateB.clear();
nonDuplicateB.addAll(newList2);
System.out.println("nonDuplicateB=="+nonDuplicateB.size());
// Replace Duplicate in Gnosis End
// Common record
//System.out.println("------Common----");
for (int i = 0; i < nonDuplicateA.size(); i++) {
DataObj a = nonDuplicateA.get(i);
for (int j = 0; j < nonDuplicateB.size(); j++) {
DataObj2 b = nonDuplicateB.get(j);
if((a.getCol2()!=null && b.getCol2()!=null )){
//System.out.println("---------");
if (a.getCol2().equalsIgnoreCase(b.getCol2())) {
// System.out.println(a.getCol2() +"--"+i+"--"+b.getCol2());
nonDuplicateAB.add(new DataObj(a.getCol1().toString()
.trim(), b.getCol1().toString().trim()));
//addLabel(sheet, 0, i, a.getCol1().toString().trim());
// addLabel(sheet, 1, i, b.getCol1().toString().trim());
break;
}
}
}
}
System.out.println("nonDuplicateAB=="+nonDuplicateAB.size());
TreeMap misA = new TreeMap();
//System.out.println("------Missing----");
for (int i = 0; i < nonDuplicateA.size(); i++) {
DataObj a = nonDuplicateA.get(i);
for (int j = 0; j < nonDuplicateB.size(); j++) {
DataObj2 b = nonDuplicateB.get(j);
if((a.getCol2()!=null && b.getCol2()!=null )){
if (!(a.getCol2().equals(b.getCol2()))) {
//System.out.println(a.getCol1() +"="+b.getCol1());
//break;
if(misA.containsValue(a.getCol2())){
misA.remove(a.getCol1());
}
else
{
misA.put(a.getCol1(), a.getCol2());
}
}
}
}
}
//System.out.println("SIze mis="+misA);
TreeMap misB = new TreeMap();
for (int i = 0; i < nonDuplicateB.size(); i++) {
DataObj2 a = nonDuplicateB.get(i);
for (int j = 0; j < nonDuplicateA.size(); j++) {
DataObj b = nonDuplicateA.get(j);
if((a.getCol2()!=null && b.getCol2()!=null )){
if (!(a.getCol2().equals(b.getCol2()))) {
//System.out.println(a.getCol1() +"="+b.getCol1());
if(misB.containsValue(a.getCol2())){
misB.remove(a.getCol1());
}
else
{
misB.put(a.getCol1(), a.getCol2());
}
}
}
}
}
// System.out.println("SIze misB="+misB);
//Getting ComID and Object Id from excel start
while (rowIterator2.hasNext()) {
HSSFRow hssfRow2 = (HSSFRow) rowIterator2.next();
if ((hssfRow2.getCell((short) 0) != null)
&& (hssfRow2.getCell((short) 1) != null)) {
comID.add(new DataObj2(hssfRow2.getCell((short) 0)
.toString().trim(), hssfRow2.getCell((short) 1)
.toString().trim()));
}
}
System.out.println("Size ComID="+comID.size());
TreeMap hm = new TreeMap();
System.out.println("Please wait...Data comparison.. ");
for (int i = 0; i < nonDuplicateAB.size(); i++) {
DataObj a = nonDuplicateAB.get(i);
for(int j=0;j<comID.size();j++ ){
DataObj2 b = comID.get(j);
//System.out.println((b.getCol2()+"---"+a.getCol1()));
if(b.getCol2().equalsIgnoreCase(a.getCol1())){
hm.put(b.getCol1(), b.getCol2());
break;
}
}
}
System.out.println("Size HM="+hm.size());
//Getting ComID and Object Id from excel End
//Data Base Updation
Connection conn = null;
try {
DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
conn = DriverManager.getConnection(
"jdbc:oracle:thin:#cxxxxx:5487:dev", "",
"");
System.out.println("after calling conn");
Set set6 = hm.entrySet();
Iterator i = set6.iterator();
String gnosisNodeId="";
int update=1;
while(i.hasNext()) {
Map.Entry me = (Map.Entry)i.next();
//System.out.print(me.getKey() + ": ");
//System.out.println(me.getValue());
// System.out.println("nonDuplicateAB="+nonDuplicateAB.size());
for(int m=0;m<nonDuplicateAB.size();m++){
DataObj a = nonDuplicateAB.get(m);
if(me.getValue().toString().equalsIgnoreCase(a.getCol1())){
gnosisNodeId=a.getCol2().toString();
nonDuplicateAB.remove(m);
break;
}
}
//System.out.println("nonDuplicateAB="+nonDuplicateAB.size());
if(gnosisNodeId!=null){
//System.out.println("LOOP");
String s1="UPDATE component SET com_xml = UPDATEXML(com_xml, '*/url/value/text()', '";
String s2="http://dmfwebtop65.pfizer.com/webtop/drl/objectId/"+gnosisNodeId;
String s3="') where com_id="+me.getKey().toString().substring(1)+"";
Statement stmt1=null;
//http://dmfwebtop65.pfizer.com/webtop/drl/objectId/0901201b8239cefb
try {
String updateString1 = s1+s2+s3;
stmt1 = conn.createStatement();
int rows =stmt1.executeUpdate(updateString1);
if (rows>0) {
addLabel(sheet, 0, update, me.getKey().toString().substring(1));
addLabel(sheet, 1, update, me.getValue().toString().substring(1));
addLabel(sheet, 2, update,gnosisNodeId );
update++;
System.out.println("Update Success="+me.getKey().toString().substring(1)+ "-->" +me.getValue().toString().substring(1));
}
else
{
System.out.println("Not Updated="+me.getKey().toString().substring(1)+ "-->" +me.getValue().toString().substring(1));
}
} catch (SQLException e) {
System.out.println("No Connect" + e);
} catch (Exception e) {
System.out.println("Error "+e.getMessage());
}
}
else{System.out.println("No gnosis id found for ObjectID="+me.getKey().toString().substring(1)); }
}//While
} //try
catch (Exception e) {
e.printStackTrace();
}
}//Main try
catch (Exception e) {
e.printStackTrace();
}
} //method
private void addCaption(WritableSheet sheet, int column, int row, String s)
throws RowsExceededException, WriteException {
Label label;
label = new Label(column, row, s, timesBoldUnderline);
sheet.addCell(label);
}
private void addNumber(WritableSheet sheet, int column, int row,
Integer integer) throws WriteException, RowsExceededException {
Number number;
number = new Number(column, row, integer, times);
sheet.addCell(number);
}
private void addLabel(WritableSheet sheet, int column, int row, String s)
throws WriteException, RowsExceededException {
Label label;
label = new Label(column, row, s, times);
sheet.addCell(label);
}
public static void main(String[] args) throws WriteException, IOException {
DscMigration test = new DscMigration();
test.setOutputFile("C:/Documents and Settings/nithya/Desktop/DSC/Report/Mapping.xls");
test.write();
System.out
.println("Please check the result file under C:/Documents and Settings/nithya/Desktop/DSC/Report/Report.xls ");
}
}
XXXXInternal Use
Based on WTTE-0043 ELC Maintenance Release and Bug Fix Plan Template
Version 4.0 Effective Date: 01-Jul-2010
//Bug Fix Plan
Author:
1 Approval Signatures
Table of Contents
I have authored this deliverable to document the plan for executing a maintenance release or bug fix to project.
NAME DATE
I have authored this deliverable to document the plan for executing a maintenance release or bug fix to XXX Plus v4.5.
NAME DATE
I approve this change and agree that this record represents the accurate and complete plan for executing the maintenance release or bug fix, and fully supports the implementation, testing and release activities for this project.
NAME DATE
I have reviewed the content of this record and found that it meets the applicable BT compliance requirements.
NAME DATE
Signatures
2 Introduction
This project deliverable documents the requested change, planned approach, development solution, test plan, test results and release approval for a maintenance release or and bug fix to project.
3 Change Request
Requestor Name:
XX
Object/
System Name:
project
Priority (High/Medium/Low):
High
Change Request No.:
NA
Change Request Date:
22-NOV-2011
Description of Problem or Requested Change:
Estimated Development Time Needed:
1 day (approx.)
4)4 Maintenance Release and Bug Fix Approach
5 Development Solution
8 Supporting References
9 Revision History

how to create appendable excelsheet using java

I want to create an append-able excel sheet.
Like i have four columns stream1 stream2 stream3 stream4
first time i am inserting data only first column(stream1)
after that i want to full fill other columns one by one.
this is the code which i am using:
public void createFile(Jqueue stream1, Jqueue stream2, Jqueue stream3, Jqueue stream4) {
try {
String filename = "path";
boolean alreadyExists = (new File(filename)).exists();
HSSFRow rowhead = sheet1.createRow((short) 0);
rowhead.createCell((short) 0).setCellValue("Stream 1");
rowhead.createCell((short) 1).setCellValue("Stream 2");
rowhead.createCell((short) 2).setCellValue("Stream 3");
rowhead.createCell((short) 3).setCellValue("Stream 4");
int i = 1;
while (!stream1.isEmpty()) {
String urlstream1 = "";
String urlstream2 = "";
String urlstream3 = "";
String urlstream4 = "";
HSSFRow row = sheet1.createRow((short) i);
try {
if (stream1.size() > 0) {
urlstream1 = stream1.dequeue().toString();
}
} catch (Exception ex) {
}
try {
if (stream2.size() > 0) {
urlstream2 = stream2.dequeue().toString();
}
} catch (Exception ex) {
}
try {
if (stream3.size() > 0) {
urlstream3 = stream3.dequeue().toString();
}
} catch (Exception ex) {
}
try {
if (stream4.size() > 0) {
urlstream4 = stream4.dequeue().toString();
}
} catch (Exception ex) {
}
row.createCell((short) 0).setCellValue(urlstream1);
row.createCell((short) 1).setCellValue(urlstream2);
row.createCell((short) 2).setCellValue(urlstream3);
row.createCell((short) 3).setCellValue(urlstream4);
i++;
}
FileOutputStream fileOut = new FileOutputStream(filename);
hwb.write(fileOut);
fileOut.close();
But this is not append-able code. its inserting data row by row.
thx in advanced.

I suppose a slight change in your code should do it.
Try replacing
int i = 1;
with the following:
int i = sheet1.getLastRowNum() + 1;
You would also need to change your implementation for reading and writing files a bit.