ADF 11G : File Downloading

How to Implement the functionality of File Downloading in ADF 11G?

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                                             filename="#{bindings.FirstName.inputValue}"

                                             method="#{DownloadBean.startDownload}"/>

              

           

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import java.io.IOException;

import java.io.OutputStream;

import java.io.OutputStreamWriter;

import javax.el.ELContext;

import javax.el.ExpressionFactory;

import javax.el.ValueExpression;

import javax.faces.application.Application;

import javax.faces.context.FacesContext;

public class Download {

    public Download() {

    }

    public void startDownload(FacesContext facesContext,

                              OutputStream outputStream) {

        // Add event code here...

       

        try {

            System.out.println("startDownload()");

            OutputStreamWriter w =

                new OutputStreamWriter(outputStream, "UTF-8");

            w.write("Neelmani here!::  ");

            w.write("------------------");

            String empName  = resolveExpression("#{bindings.FirstName.inputValue}").toString();

            String empNumber  = resolveExpression("#{bindings.EmployeeId.inputValue}").toString();

            w.write(empName);

            w.write("------------------");

            w.write(empNumber);

           

            // The stream is automatically closed, but since we wrapped it,

            // we'd better flush our writer

            w.flush();

        } catch (IOException ex) {

            ex.printStackTrace();

        }

    }

    public static Object resolveExpression(String expression) {

    FacesContext facesContext = getFacesContext();

    Application app = facesContext.getApplication();

    ExpressionFactory elFactory = app.getExpressionFactory();

    ELContext elContext = facesContext.getELContext();

    ValueExpression valueExp =

    elFactory.createValueExpression(elContext, expression,

    Object.class);

    return valueExp.getValue(elContext);

    }

   

    public static FacesContext getFacesContext() {

    return FacesContext.getCurrentInstance();

    }

}