Help for writing to excel file from Java Program

Hi,
I am new to Java and Java API. I need to write to some specific cells of an excel file from a Java Program. Please anyone help me or give some directions.
Thanks,
Reet

Hi,
I saw an example while searching in google about importing jxl.*. Could you direct me how I can import this package as java does not have it. I heard that jxl is much easier that POI although I am not new to both of them.
Thanks,
Priya

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Need urgent help. Calling of exe files from java program

This program can execute small .exe files that donot take inputs but doesn't work for exe files that takes input. what could be the problem.
Server code :-
import java.io.*;
import java.net.*;
public class Server1 {
     private Player[] players;
     private ServerSocket server;
     private ExecHelper exh;
     String command = null;
     String message = null;
     public Server1() {
          players = new Player[5];
          try {
               server = new ServerSocket( 12345, 5 );
               System.out.println("Server started...");
               System.out.println("Waiting for request...");
          catch( IOException ioe ) {
               ioe.printStackTrace();
               System.exit( 1 );
     } //end Server constructor
     public void execute() {
          for( int i = 0; i < players.length; i++ )
          try {
               players[i] = new Player( server.accept() );
               players.start();
          catch( IOException ioe ) {
               ioe.printStackTrace();
               System.exit( 1 );
     public static void main( String args[] ) {
          Server1 ser = new Server1();
          ser.execute();
          System.exit( 1 );
     private class Player extends Thread {
          private Socket connection;
          private ObjectOutputStream output;
          private ObjectInputStream input;
          public Player( Socket socket ) {
               connection = socket;
               try {
                    input = new ObjectInputStream( connection.getInputStream());
                    output = new ObjectOutputStream( connection.getOutputStream());
                    output.flush();
               catch( IOException ioe ) {
                    ioe.printStackTrace();
                    System.exit( 1 );
          public void run() {
               try {
                    message = "Enter a command:";
                    output.writeObject( message );
                    output.flush();
                    do {
                         command = ( String ) input.readObject();
                         String osName = System.getProperty( "os.name" );
                         String[] cmd = new String[3];
                         if( osName.equals( "Windows 2000" )) {
                              cmd[0] = "cmd.exe";
                              cmd[1] = "/c";
                              cmd[2] = command;
                         else if( osName.equals( "Windows NT" ) ) {
                         cmd[0] = "cmd.exe" ;
                         cmd[1] = "/C" ;
                         cmd[2] = command ;
                         Runtime rt = Runtime.getRuntime();
                         Process proc = rt.exec( cmd );
                         exh = new ExecHelper( proc, output, input);
                    } while( !command.equals( "TERMINATE" ) );
               catch( Throwable t ) {
                    t.printStackTrace();
     } //end class Player
     public class ExecHelper implements Runnable {
     private Process process;
     private InputStream pErrorStream;
     private InputStream pInputStream;
     private OutputStream pOutputStream;
     private InputStreamReader isr;
     private InputStreamReader esr;
     private PrintWriter outputWriter;
     private ObjectOutputStream out;
     private ObjectInputStream in;
     private BufferedReader inBuffer;
     private BufferedReader errBuffer;
     private Thread processThread;
     private Thread inReadThread;
     private Thread errReadThread;
     private Thread outWriteThread;
     public ExecHelper( Process p, ObjectOutputStream output, ObjectInputStream input ) {
          process = p;
          pErrorStream = process.getErrorStream();
          pInputStream = process.getInputStream();
          pOutputStream = process.getOutputStream();
          outputWriter = new PrintWriter( pOutputStream, true );
          in = input;
          out = output;
          processThread = new Thread( this );
          inReadThread = new Thread( this );
          errReadThread = new Thread( this );
          outWriteThread = new Thread( this );
          processThread.start();
          inReadThread.start();
          errReadThread.start();
          outWriteThread.start();
     public void processEnded( int exitValue ) {
          try {
               Thread.sleep( 1000 );
          catch( InterruptedException ie ) {
               ie.printStackTrace();
     public void processNewInput( String input ) {
          try {
               out.writeObject( "\n" + input );
               out.flush();
               catch( IOException ioe ) {
               ioe.printStackTrace();
     public void processNewError( String error ) {
          try {
               out.writeObject( "\n" + error );
               out.flush();
     catch( IOException ioe ) {
               ioe.printStackTrace();
     public void println( String output ) {
          outputWriter.println( output + "\n" );
     public void run() {
          if( processThread == Thread.currentThread()) {
               try {
                    processEnded( process.waitFor());
               catch( InterruptedException ie ) {
                    ie.printStackTrace();
          else if( inReadThread == Thread.currentThread() ) {
               try {
                    isr = new InputStreamReader( pInputStream );
                    inBuffer = new BufferedReader( isr );
                    String line = null;
                    while(( line = inBuffer.readLine()) != null ) {
                              processNewInput( line );
               catch( IOException ioe ) {
                    ioe.printStackTrace();
          else if( outWriteThread == Thread.currentThread() ) {
               try {
                    String nline = null;
                    nline = ( String ) in.readObject();
                    println( nline );
               catch( ClassNotFoundException cnfe ) {
               //     cnfe.printStackTrace();
               catch( IOException ioe ) {
                    ioe.printStackTrace();
          else if( errReadThread == Thread.currentThread() ) {
               try {
                    esr = new InputStreamReader( pErrorStream );
                    errBuffer = new BufferedReader( esr );
                    String nline = null;
                    while(( nline = errBuffer.readLine()) != null ) {
                         processNewError( nline );
               catch( IOException ioe ) {
                    ioe.printStackTrace();
Client code :-
// client.java
import java.io.*;
import java.net.*;
public class Client {
     private ObjectOutputStream output;
     private ObjectInputStream input;
     private String chatServer;
     private String message = "";
     private Socket client;
     public Client( String host ) {
          chatServer = host;
     private void runClient() {
          try {
               connectToServer();
               getStreams();
               processConnection();
          catch( EOFException eofe ) {
               System.err.println( "Client terminated connection ");
          catch( IOException ioe ) {
               ioe.printStackTrace();
          finally {
               closeConnection();
     } //end method runClient
     private void connectToServer() throws IOException {
          System.out.println( "Attempting connection...\n");
          client = new Socket( InetAddress.getByName( chatServer ), 12345);
          System.out.println( "Connected to : "+ client.getInetAddress().getHostName());
     private void getStreams() throws IOException {
          output = new ObjectOutputStream( client.getOutputStream());
          output.flush();
          input = new ObjectInputStream( client.getInputStream());
     private void processConnection() throws IOException {
     while( true ){
               try {
                    message = ( String ) input.readObject();
                    System.out.print( message );
                    InputStreamReader isr = new InputStreamReader( System.in);
                    BufferedReader br = new BufferedReader( isr );
                    String line = null ;
                    line = br.readLine();
                         output.writeObject(line);
                         output.flush();
               catch( ClassNotFoundException cnfe) {
                    System.out.println( "\nUnknown object type received");
     } //end processConnection
     private void closeConnection() {
          System.out.println( "\nClosing connection");
          try {
               output.close();
               input.close();
               client.close();
          catch( IOException ioe ) {
               ioe.printStackTrace();
     public static void main( String args[] ) {
          Client c;
          if( args.length == 0 )
               c = new Client( "127.0.0.1" );
          else
               c = new Client( args[0] );
          c.runClient();

maybe you should
1. Use code tags so the posted code is understandable
2. Stop marking your post urgent, that just puts peoples backs up
3. Stop posting the question every couple of hours on every imaginable forum.. Post it once and start a single dialog

How to Call .XDO file From Java Program

Hi,
I have developed a report in using BI Publisher version 10.1.3.
I created the report and it only created XDO files. If I want to call XDO file from Java program how I can do that.
What are the APIs available to do that.
Thanks
-Ashutosh

Hi,
the JavaAPI didn't work with the xdo-Files. But you can create a proxy stub for the Web Service API of BI Publisher which uses the xdo's in the repository.
regards
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Create an excel file from java

I am using Jakarta's POI to create an excel file from MySql. The POI works well when a samll amount of data was written from MySql (created .xls file less than 3500KB). The problem is when a large amount of data need to be written to an excel file, java.lang.OutOfMemoryError Exception in thread "main" appears. In my project, I really need to have a large amount of data to be wriiten ton excel file. Do somebody has good solution for it?
Thanks

What about using some text files like csv
(comma-separated value) file? It is plain text but
Excel (and other spreadsheet programs) will be able to
read it.
But then there will be no formatting and bells and
whistles. It was just an idea.Excel will also read HTML <TABLE>'s, with full formatting. There are some extra tags for numeric formatting, also. Just create an HTML table, and save to a file with .xls extension, e.g.:
<TABLE>
<TR bgcolor="#00FF7F">
<TH>Agency ID</TH>
<TH>POS ID</TH>
<TH>Machine Serial</TH>
<TH>Disk Serial</TH>
<TH>MAC ID</TH>
<TH>System Manufacturer</TH>
<TH>Machine Type</TH>
<TH>BIOS Manufacturer</TH>
<TH>BIOS Version</TH>
<TH>BIOS Date</TH>
</TR>
<TR bgcolor="#9ACD32">
<TD>1000</TD>
<TD>1069</TD>
<TD STYLE='vnd.ms-excel.numberformat:@'>US215199248</TD>
<TD STYLE='vnd.ms-excel.numberformat:@'>5C5AE88F3</TD>
<TD STYLE='vnd.ms-excel.numberformat:@'>000423155334</TD>
<TD>Hewlett-Packard</TD>
<TD>Desktop</TD>
<TD>American Megatrends Inc.</TD>
<TD>JA.01.03US</TD>
<TD>07/19/2001</TD>
</TR>
</TABLE>

How to edit the existing data in the XML file from java programming.

Hi all
i am able to create XML file with the sample data as below from java programming.
i need sample code on how to edit the existing data in the XML file?
for example
<?xml version="1.0"?>
   <mydata>
           <data1>
                     <key1>467</key1>
                    <name1>Paul</name1>
                    <id1>123</id1>
          </data1>
          <data2>
                     <key2>467</key2>
                    <name2>Paul</name2>
                    <id2>123</id2>
          </data2>
    </mydata>
i am able to insert the data in the XML.
now i need sample code on how to modify the data in the above XML file from the java programming for only key2,name2,id2 tags only. the remaining tags data in the XML file i want to keep same data except for key2,name2,id2 which are i want to modify from java code
Regards
Sunil
[points will be always rewardable]

hi
u need a parser or validate the xml file for to read the xml file from java coding u need for this
xml4j.jar u can download this file from here
http://www.alphaworks.ibm.com/tech/xml4j
or we can use the SAX(simple API for XML)
some sample applications for this
http://www.java-tips.org/java-se-tips/javax.xml.parsers/how-to-read-xml-file-in-java.html
http://www.developertutorials.com/tutorials/java/read-xml-file-in-java-050611/page1.html
http://www.xml-training-guide.com/e-xml44.html
let me know u need any other info
bvr

URGENT:- Running a batch file from java program

Author: pkanury
I am trying to execute a batch file from my java program using RunTime and Process . It can execute any dos command except for a batch file. Can anyone throw
some light ?? My code looks like this .....
cmd = "command.com /c X:\\grits\\scripts\\test.bat"; Runtime rt = Runtime.getRuntime(); Process p = rt.exec(cmd);
The weird part is that p.waitFor() returns a status of 0 implying that the cmd has been executed successfully. But that is not the case. And my batch file is as simple as - type "ADADA" > junk.txt
Any help would be appreciated.

I think it should work when you use a String[] array
instead of a single String:
String[] cmd = { "command.com", "/C", "D:\\batch\\do.bat" };
Note: If the batchfile creates any output (i.e. files),
they will be stored in the directory of the application
which calls the batch file, not in d:\batch\...

Calling a function in an EXE file from Java Program

Hi Im having a function which is written in c program.i need to call that function from my java program, if i create a shared library (DLL) for my C code then it works but my requirement is i dont want to create that DLL , like in it would be an executable and my java code should access that function in that C program

I understand the usage od a DLL but the thing is if i convert the exe to a DLL
the server doesnt start at all so what i need is that i dont want to change
that .EXE into a .DLL,let it be an executable. that executable is in running mode
and through my java program i need to call a function in that EXE file.
Is ther any way to do it?Nope, but you have another problem: why can't you separate your server program
into a .dll part and a startup part? Both, when properly linked against each other
should give you an executable file.
kind regards,
Jos

Execute a .cmd file from Java program on tomcat which is running as service

I have a .cmd/,.bat file which has to be executed depending on the parameters I pass through JSP page hosted on a tomcat instance.
Tomcat is running as a windows service.
I need my .cmd file to be opened in a cmd or DOS box so that user can interact with the dos window, which is mandatory.
When I run the program from eclipse it works well but on the tomcat , the server side the output of the command is written to my log file and it gives no chance for users to monitor and interact with the command.
Should I do something with log4j settings or is due to tomcat running as service?
Please help.
thanks

thanks for the responses.
But the design is like that.Then it needs to be fixed.
I think this is why there's a shortage of people to write computer applications, they are all wasting their time struggling to implement bad designs.
its a scheduler to be run on tomcat where we interact
with the running batch files and can't be changed.A scheduler in Tomcat? Why run a scheduler in an application server?
any help is appreciated.
I tried to execute the batch file from servlet it
runs , but i see the cmd.exe in windows task manager
and need a dos box open.
Any ideas?If you need a DOS box open then you need a signed-on user. So here's my patch:
1. Write an application that listens for messages from this Tomcat scheduler, and when it receives those messages it does something in a DOS box.
2. Have somebody sign on to the server and run that application.
3. Change the Tomcat scheduler to send messages to that application instead of trying to actually run it.
It's up to you what kind of messages you should send. There are plenty of choices.

How to execute .msi files from java program

Hi friends,
i have written a java program which invokes and thereby execute any executable files like .exe and .bat.
So its working fine with .exe and .bat files, but it is not working with .msi files.......can you please help me how can i execute .msi files as well??
public class Executeexe {
     public static void main(String ar[])
          try
          Process p=null;
          Runtime rt=Runtime.getRuntime();
          p=rt.exec("D:\\mysql-essential-5.0.83-win32.msi");
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catch(Exception e)
}here is the program

Make sure that the command that's being exec'd works from the cmd line.
Then read this article and do what it says:
http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html
Then if you still are having problems explain what "...it is not working with .msi files..." really means, and provide a [SSCCE Example program|http://mindprod.com/jgloss/sscce.html]

Calling batch file from java Program

I have made the java program in which i have called the batch file.But the problem is this that when i call batch file locally it executes normally but when i try to execute batcvh file from remote machine it doesn't runrather it gives Runtime IO execption.Error123.Can anyone provide me the solution for this?

Not without a lot more information. Like for example how you are trying to execute this remote batch file, the code you are using to do that, what kind of server you have no the remote machine to let you remotely execute code, and so on.

How to call a exe or bat file from java program

hi,
i actually want to know that how to call a exe or bat file from program so that i can run them parallely.

Try this :
String strCmd = "myFile.bat";
try
     Runtime rTime = Runtime.getRuntime();
     Process process = rTime.exec(strCmd);
     InputStream p_in = process.getInputStream();
     OutputStream p_out = process.getOutputStream();
     InputStream p_err = process.getErrorStream();
     p_in.close();
     p_out.close();
     p_err.close();
catch(Exception e) {
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}

Creating Excel Files From Java Please Help I am Lost

I am doing a project in jbuilder an using a mysql db on a remote server what i want to do is to generate reports in ms excel after executing a query for example if I search for students aged 20+ I want to generate an excel sheet with all the records ....
Does anyone knows how to do that or is there a good tutorial on the web that explains this issue
Your help is appreciated many thanks...........

Spooling the data in a comma "," delimited file is actually a good option. I have used this a couple of times and works like a charm. Spoooling the file is easy because it is a normal text file. Do remember to name the file as <something>.csv - files with this extension is linked to Excel in Windows.

Help: question on send XML file from java client to java server

Hi, I am now to Java, and now I am going to set up a simple network in the lab.
I have created a random array of data and transferred to XML file on my client. Now, I would like to send it to the server. I am wondering how I can put the XML file into my client, and do I need any parser to let the server show what random date it has received?
Anybody can give me any idea or some basic code? Thank you.
Now, I am referring the KnockKnock example in Java online tutorial. But, not clear how to deal with the XML File.
Fengyuan

There are several ways you can achieve this: one could be that you transfer data over HTTP, using Servlets for instance. Have a Servlet listening on the Server with content type 'text/xml', POST the XML data to the server and have the Servlet to receive the data and re-compose the XML file. This can be achieved with different libraries:
1) JAXB --> this is good because is the JDK standard, also for web services
2) Castor (http://www.castor.org/)

Executing exe files from java program

Hi,
I need to execute exe files and pass arguments to them from my java code.
Can you give me guidelines to do that as i haven't done that before.
Thanks.

http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Runtime.html
getRuntime() method.
exec() method.

How to call windows help files .hlp from Java program

Hai all everybody
How to call windows Help file that is xxx.hlp files from java programs
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regards
veeru

How about
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Help for writing to excel file from Java Program

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