Problem in reading no. of files and writing into a single file

Question

Hi,
Iam with Problem in reading no. of files and writing into a single file....
Iam reading no. of files stored in local directory.......
Iam able to read and print the data in files successfully....but while writing..only first file is being written...and the next files are not written in my output file...
plz tell me my mistake....I hope Iam doing some mistake while writing into file...PLz help.....
Basically my code structure is like this....
import java.io.*;
import java.util.regex.*;
import java.util.*;
import java.text.*;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFCell;
class Writing {
public static void main(String args[]) throws Exception {
          FileOutputStream fileOut = new FileOutputStream("ServerResult.xls"); //my output file
          int counter = 1;
          File dir = new File("C:/Perform/ServerLogs");
          String[] children = dir.list();
          if( children == null)
               System.out.println("The Directory mentioned does not exist");
          else {
               for (int fileNo = 0; fileNo < children.length; fileNo++ ) {        //Files iteration starts
                    String filename = children[fileNo];
          File logFile = new File(filename);
FileReader logFileReader = new FileReader(logFile);
BufferedReader logReader = new BufferedReader(logFileReader);
StringBuffer sBuf = new StringBuffer(5000);
          HSSFWorkbook wb = new HSSFWorkbook();          
          HSSFSheet sheet = wb.createSheet();
          HSSFRow rowTitle;
          HSSFRow rowReq;
          HSSFRow rowRes;
String aLine = null;
boolean skip = false;
boolean readed = false;
boolean initReq = false;
          boolean flag = false;
long requestTime = 0;
long responseTime = 0;
long recdTime = 0;
long sentTime = 0;
          long hasTime = 0;
          long presentTime = 0;
          int hasCalls = 0;
Pattern startMessage = Pattern.compile("^<MESSAGE.*ID=\".*_"+args[0]+"\".*", Pattern.DOTALL);
Pattern requestMessage = Pattern.compile("^<MESSAGE.*TS=\"(.*)\" CATEGORY=\"RequestMsg.\".*ID=\".*_"+args[0]+"\".*<ActName>(.*)</ActName>.*", Pattern.DOTALL);
Pattern requestMessage1 = Pattern.compile("^<MESSAGE.*TS=\"(.*)\" CATEGORY=\"RequestMsg.\".*ID=\".*_"+args[0]+"\".*<Svc id=\"(.*)\">.*", Pattern.DOTALL);
Pattern responseMessage = Pattern.compile("^<MESSAGE.*TS=\"(.*)\" CATEGORY=\"ResponseMsg\".*ID=\".*_"+args[0]+"\".*", Pattern.DOTALL);
Pattern initMessage = Pattern.compile("^<MESSAGE.*TS=\"(.*)\" CATEGORY=\"HostConnInit\".*ID=\".*_"+args[0]+"\".*", Pattern.DOTALL);
Pattern initResMessage = Pattern.compile("^<MESSAGE.*TS=\"(.*)\" CATEGORY=\"ResponseMsg\".*ID=\"null\".*", Pattern.DOTALL);
Pattern initResIDMessage = Pattern.compile("^<MESSAGE.*TS=\"(.*)\" CATEGORY=\"ResponseMsg\".*ID=\"null\".*<IATA>"+args[0]+"</IATA>.*", Pattern.DOTALL);
          Pattern sentMessage = Pattern.compile("^<MESSAGE.*TS=\"(.*)\" CATEGORY=\"DCMsgSentInfo\".*ID=\".*_"+args[0]+"\".*", Pattern.DOTALL);
          Pattern rcvdMessage = Pattern.compile("^<MESSAGE.*TS=\"(.*)\" CATEGORY=\"DCMsgRcvdInfo\".*ID=\".*_"+args[0]+"\".*", Pattern.DOTALL);
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
DecimalFormat dcf = new DecimalFormat("########.##");
String actName = "";
          if (fileNo ==0)
          rowTitle = sheet.createRow((short)0);
          rowTitle.createCell((short)0).setCellType(HSSFCell.CELL_TYPE_STRING);
          rowTitle.createCell((short)0).setCellValue("Req/Res");
          rowTitle.createCell((short)1).setCellType(HSSFCell.CELL_TYPE_STRING);
          rowTitle.createCell((short)1).setCellValue("Action");
          rowTitle.createCell((short)2).setCellType(HSSFCell.CELL_TYPE_STRING);
          rowTitle.createCell((short)2).setCellValue("Server Time(in ms)");
          rowTitle.createCell((short)3).setCellType(HSSFCell.CELL_TYPE_STRING);
          rowTitle.createCell((short)3).setCellValue("Request Vs Response Time in Server(in ms)");
          rowTitle.createCell((short)4).setCellType(HSSFCell.CELL_TYPE_STRING);
          rowTitle.createCell((short)4).setCellValue("Time Taken By HAS/HOST(in ms)");
          rowTitle.createCell((short)5).setCellType(HSSFCell.CELL_TYPE_STRING);
          rowTitle.createCell((short)5).setCellValue("No. of HAS calls");
          rowTitle.createCell((short)6).setCellType(HSSFCell.CELL_TYPE_STRING);
          rowTitle.createCell((short)6).setCellValue("Data Size");
          //wb.write(fileOut);
while((aLine=logReader.readLine()) != null) {
if(aLine.startsWith("<MESSAGE TYPE=\"EVENT\"")) {
Matcher m = startMessage.matcher(aLine);
if(m.find()) {
sBuf.setLength(0);
sBuf.append(aLine);
skip = false;
initReq = false;
m = initMessage.matcher(aLine);
if(m.find()) {
initReq = true;
} else {
if(initReq) {
m = initResMessage.matcher(aLine);
if(m.find()) {
sBuf.setLength(0);
sBuf.append(aLine);
skip = false;
} else if(aLine.startsWith("</MESSAGE>")) {
if(!skip) {
sBuf.append(aLine);
readed = true;
} else if(!skip){
sBuf.append(aLine);
if(!skip && readed) {
String tempStr = sBuf.toString();
if(tempStr.length() > 0) {
boolean reqMatched = false;
Matcher m = null;
if(initReq) {
m = initMessage.matcher(tempStr);
actName = "Intialization";
} else {
m = requestMessage.matcher(tempStr);
String time = "";
if(m.find()) {
reqMatched = true;
for (int i=1; i<=m.groupCount(); i++) {
String groupStr = m.group(i);
if(i == 1) {
time = groupStr;
} else if(i == 2) {
actName = groupStr;
} else if(!initReq){
m = requestMessage1.matcher(tempStr);
if(m.find()) {
reqMatched = true;
for (int i=1; i<=m.groupCount(); i++) {
String groupStr = m.group(i);
if(i == 1) {
time = groupStr;
} else if(i == 2) {
actName = groupStr;
if(time.length() > 0 ) {
try{
requestTime = sdf.parse(time).getTime();
}catch(Exception ex){}
System.out.println("Request,"+actName+","+time+",,,,"+dcf.format(((double)time.length()/1024.0))+"K");
                              //bw.write("Request,"+actName+","+time+",,,,"+dcf.format(((double)time.length()/1024.0))+"K");
                              String reqDataSize = dcf.format(((double)time.length()/1024.0))+"K" ;
                              rowReq = sheet.createRow((short)counter);
                                   rowReq.createCell((short)0).setCellType(HSSFCell.CELL_TYPE_STRING);
                                   rowReq.createCell((short)0).setCellValue("Request");
                                   rowReq.createCell((short)1).setCellType(HSSFCell.CELL_TYPE_STRING);
                                   rowReq.createCell((short)1).setCellValue(actName);
                                   rowReq.createCell((short)2).setCellType(HSSFCell.CELL_TYPE_STRING);
                                   rowReq.createCell((short)2).setCellValue(time);
                                   rowReq.createCell((short)3).setCellType(HSSFCell.CELL_TYPE_STRING);
                                   rowReq.createCell((short)3).setCellValue("");
                                   rowReq.createCell((short)4).setCellType(HSSFCell.CELL_TYPE_STRING);
                                   rowReq.createCell((short)4).setCellValue("");
                                   rowReq.createCell((short)5).setCellType(HSSFCell.CELL_TYPE_STRING);
                                   rowReq.createCell((short)5).setCellValue("");
                                   rowReq.createCell((short)6).setCellType(HSSFCell.CELL_TYPE_STRING);
                                   rowReq.createCell((short)6).setCellValue(reqDataSize);
                                   counter = counter +1;
                                   System.out.println("counter is "+counter);
                         Matcher l = sentMessage.matcher(tempStr);
                         Matcher k = rcvdMessage.matcher(tempStr);
               if(l.find()) {
                                        for (int i=1; i<=l.groupCount(); i++) {
     String groupStr2 = l.group(i);
try{
sentTime = sdf.parse(groupStr2).getTime();
}catch(Exception ex){}
                    if(k.find())
                                             for(int j=1;j<=k.groupCount(); j++) {
                                             String groupStr1 = k.group(j);
                                             try{
recdTime = sdf.parse(groupStr1).getTime();
}catch(Exception ex){}
                                             presentTime = (recdTime - sentTime);
                                             hasTime = hasTime + presentTime;
                                             hasCalls = hasCalls +1;
if(!reqMatched) {
if(initReq) {
m=initResIDMessage.matcher(tempStr);
} else {
m=responseMessage.matcher(tempStr);
if(m.find()) {
for (int i=1; i<=m.groupCount(); i++) {
String groupStr = m.group(i);
try{
responseTime = sdf.parse(groupStr).getTime();
}catch(Exception ex){}
                                             String resDataSize = dcf.format(((double)tempStr.length()/1024.0))+"K" ;
                                             rowRes = sheet.createRow((short)(counter));
                                             rowRes.createCell((short)0).setCellType(HSSFCell.CELL_TYPE_STRING);
                                             rowRes.createCell((short)0).setCellValue("Response");
                                             rowRes.createCell((short)1).setCellType(HSSFCell.CELL_TYPE_STRING);
                                             rowRes.createCell((short)1).setCellValue(actName);
                                             rowRes.createCell((short)2).setCellType(HSSFCell.CELL_TYPE_STRING);
                                             rowRes.createCell((short)2).setCellValue(groupStr);
                                             rowRes.createCell((short)3).setCellType(HSSFCell.CELL_TYPE_NUMERIC);
                                             rowRes.createCell((short)3).setCellValue((responseTime - requestTime));
                                             rowRes.createCell((short)4).setCellType(HSSFCell.CELL_TYPE_NUMERIC);
                                             rowRes.createCell((short)4).setCellValue(hasTime);
                                             rowRes.createCell((short)5).setCellType(HSSFCell.CELL_TYPE_NUMERIC);
                                             rowRes.createCell((short)5).setCellValue(hasCalls);
                                             rowRes.createCell((short)6).setCellType(HSSFCell.CELL_TYPE_STRING);
                                             rowRes.createCell((short)6).setCellValue(resDataSize);
                                             hasTime = 0;
                                             hasCalls = 0;
                                             counter = counter + 1 ;
sBuf.setLength(0);
readed = false;
          wb.write(fileOut);
          } // End of for (int fileNo = 0; fileNo < children.length; fileNo++ )
}     //End of else
          fileOut.close();
} //End of public static void main
} // End of Class

Answer 1

First of all, use [code]-tags to make your code readable, please.
I didn't do a complete inspection of your code (because it's too much and unreadable as it is) and I don't know POI, but creating a new HSSFWorkbook for each input file sounds fishy to me ... try re-using the workbook and just creating a new sheet in each iteration.