Writing a file in a EJB

[dnloreto]

Hello!

I've written an EJB that reads a file on the filesystem using the FSContext from the JNDI. It returns the file content as a string (it's an ASCII file) to the client.

Now I'm trying to write a file to the filesystem and I'm unable to. I've looked around for documentation on how to do it, but I can't find any. I looked at the fscontext.jar contents but the methods that look revelant are all protected.

Can anyone give me a piece of code where a Java object or even a simple piece of text is writen on a file? Or correct my piece of code...

Thank you very much!

HappyGuy

public void writeFile(java.lang.String sFilePath, java.lang.String sFileName, java.lang.String sFileContent) {
try
{
Hashtable env = new Hashtable();
env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.fscontext.RefFSContextFactory");
env.put(Context.PROVIDER_URL, "file:///" + sFilePath);
Context initialContext = new InitialContext(env);
System.out.println("Environment = " + env);

File fNewFile = new File(sFileName);
System.out.println("Created File");

(new ObjectOutputStream(new FileOutputStream(fNewFile))).writeObject(sFileContent);
System.out.println("Wrote File");

initialContext.createContext(fNewFile);
System.out.println("Created File in FileSystem");
}
catch(Exception e){
System.out.println("Exception! Error: " + e.getMessage());
}

[regulus]

I am able to read and write file in a EJB by using
javax.activation.FileDataSource.
Something like this:

FileDataSource ds = new FileDataSource("/tmp/abc");
InputStream is = ds.getInputStream();
OutputStream os = ds.getOutputStream();

The EJB spec discourages the use of file io, so I'm not sure if this is legal or it's a hole in JBoss, and will be made illegal in future JBoss versions... I'm using JBoss 2.4.4. Can somebody from JBoss team help clarifying this? Thanks in advance.

[corban]

Hi,

afaik the ejb spec does permit direct file access via the java.io package, you would "leave" the container through an input/output stream. but javax.activation.FileDataSource is a resource provided by the container, i think you can use it as you can use a DataSource for example.

[dddu88]

Hi, can we use FileDataSource in activation package for extensive file IO to local drive instead of using entity bean to put into database? because our requirements requires that.

Thanks