OAF(File upload to application server)

Following is the code which u have to written in Controller class
steps to follow 
1) create one item on page as  type messagefileupload
2)and call the method  from any event
uploadFileToServer(pageContext,"item2","/u03/DEV/devcomn/java");
3) and simply make changes as change the item2  and the path that is highlighted
(you can check it by changing the path to local system as "D:/new folder/") this is for testing 

import oracle.apps.fnd.common.VersionInfo;
import oracle.apps.fnd.framework.webui.OAControllerImpl;
import oracle.apps.fnd.framework.webui.OAPageContext;
import oracle.apps.fnd.framework.webui.beans.OAWebBean;
import oracle.apps.fnd.common.VersionInfo;
import oracle.apps.fnd.framework.webui.OAControllerImpl;
import oracle.apps.fnd.framework.webui.OAPageContext;
import oracle.apps.fnd.framework.webui.beans.OAWebBean;
import java.io.Serializable;
import oracle.apps.fnd.framework.OAApplicationModule;
import oracle.apps.fnd.common.VersionInfo;
import oracle.apps.fnd.framework.webui.OAControllerImpl;
import oracle.apps.fnd.framework.webui.OAPageContext;
import oracle.apps.fnd.framework.webui.beans.OAWebBean;
import oracle.apps.fnd.framework.OAException;
import oracle.cabo.ui.data.DataObject;
import java.io.FileOutputStream;
import java.io.InputStream;
import oracle.jbo.domain.BlobDomain;
import java.io.File;

in process form request write under  event
{
 uploadFileToServer(pageContext,"item2","/u03/DEV/devcomn/java");
}

public void uploadFileToServer(OAPageContext pageContext,
String fileuploadBeanId,
String server_dir_path)
{
DataObject fileUploadData =
(DataObject) pageContext.getNamedDataObject(fileuploadBeanId);
if(fileUploadData!=null)
{
String uFileName =
(String) fileUploadData.selectValue(null, "UPLOAD_FILE_NAME");
String contentType =
(String) fileUploadData.selectValue(null, "UPLOAD_FILE_MIME_TYPE");

File file = new File(server_dir_path, uFileName);
FileOutputStream output = null;
InputStream input = null;
try
{
output = new FileOutputStream(file);
BlobDomain uploadedByteStream =
(BlobDomain) fileUploadData.selectValue(null, uFileName);
input = uploadedByteStream.getInputStream();
for (int bytes = 0; bytes < uploadedByteStream.getLength(); bytes++)
{
output.write(input.read());
}
}
catch (Exception e)
{
e.printStackTrace();
}
finally
{
try
{
if (input != null)
{
input.close();
}
if (output != null)
{
output.close();
output.flush();
}
}
catch (Exception ez)
{
ez.printStackTrace();
}
}

}
}

steps to remember
-1)always check the item id of messagefileupload item  and change at highlighted  item2 place
2)sometimes the u are unable to store the file at application server because u dont have full access to create or write any thing on server so check with DBA and told him give the full access rights to the folder.