Web JNDI : JNDI « Servlets « Java

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Java » Servlets » JNDI 




Web JNDI
 
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.rmi.PortableRemoteObject;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class WebJndiServlet extends HttpServlet {

  public void doGet(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, java.io.IOException {

    String state = request.getParameter("state");
    Context env = null;
    Abbrev abbrev = null;
    AbbrevHome home = null;

    try {

      env = (Contextnew InitialContext();

      Object localH = env.lookup("AbbrevHome");

      home = (AbbrevHomePortableRemoteObject.narrow(localH,
          AbbrevHome.class);

      //close the InitialContext
      env.close();

      if (home == null)
        throw new ServletException(
            "AbbrevHome is an unknown JNDI object");

      abbrev = (AbbrevPortableRemoteObject.narrow(home.create(),
          Abbrev.class);

    catch (NamingException ne) {

      try {
        env.close();
      catch (NamingException nex) {
      }

      throw new ServletException(ne);

    catch (javax.ejb.CreateException ce) {

      throw new ServletException(ce);

    }

    //set the MIME type of the response, "text/html"
    response.setContentType("text/html");

    //use a PrintWriter send text data to the client who has requested the
    // servlet
    java.io.PrintWriter out = response.getWriter();

    //Begin assembling the HTML content
    out.println("<html><head>");

    out.println("<title>State abbreviations</title></head><body>");
    out.println("<h2>Here is the state's abbreviation</h2>");

    if (state != null)
      out.println(abbrev.getAbbreviation(state.toUpperCase()));

    try {

      abbrev.remove();

    catch (javax.ejb.RemoveException re) {
    }

    out.println("</body></html>");

    out.close();
  //end doGet

  public void doPost(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, java.io.IOException {

    doGet(request, response);

  }// doPost

}//BeanServlet


           
         
  














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