Java Servlet Example / Sample code to read and create session objects

package test;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;
import java.util.Enumeration;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * Servlet implementation class SessionExample
 */

public class SessionExample extends HttpServlet {
 private static final long serialVersionUID = 1L;

 public void doGet(HttpServletRequest request, HttpServletResponse response)
   throws IOException, ServletException {
  response.setContentType("text/html");

  PrintWriter out = response.getWriter();
  out.println("<html>");
  out.println("<body bgcolor=\"white\">");
  out.println("<head>");

  String title = "Session Example";
  out.println("<title>" + title + "</title>");
  out.println("</head>");
  out.println("<body>");


  out.println("<h3>" + title + "</h3>");

  HttpSession session = request.getSession(true);
  out.println("Session Id: " + session.getId());
  out.println("<br>");
  out.println("Created On: ");
  out.println(new Date(session.getCreationTime()) + "<br>");
  out.println("Last Accessed On: ");
  out.println(new Date(session.getLastAccessedTime()));

  String dataName = request.getParameter("dataname");
  String dataValue = request.getParameter("datavalue");
  if (dataName != null && dataValue != null) {
   session.setAttribute(dataName, dataValue);
  }

  out.println("<P>");
  out.println( "Session Data: <br>");
  Enumeration<?> names = session.getAttributeNames();
  while (names.hasMoreElements()) {
   String name = (String) names.nextElement();
   String value = session.getAttribute(name).toString();
   out.println(name+ " = "
     + value + "<br>");
  }

  out.println("<P>");
  out.print("<form action=\"");
  out.print(response.encodeURL("SessionExample"));
  out.print("\" ");
  out.println("method=POST>");
  out.println("Name of Session Attribute: ");
  out.println("<input type=text size=20 name=dataname>");
  out.println("<br>");
  out.println("Value of Session Attribute: ");
  out.println("<input type=text size=20 name=datavalue>");
  out.println("<br>");
  out.println("<input type=submit>");
  out.println("</form>");

  out.println("<P>GET based form:<br>");
  out.print("<form action=\"");
  out.print(response.encodeURL("SessionExample"));
  out.print("\" ");
  out.println("method=GET>");
  out.println("Name of Session Attribute: ");
  out.println("<input type=text size=20 name=dataname>");
  out.println("<br>");
  out.println("Value of Session Attribute: ");
  out.println("<input type=text size=20 name=datavalue>");
  out.println("<br>");
  out.println("<input type=submit>");
  out.println("</form>");

  out.print("<p><a href=\"");
  out.print(response
    .encodeURL("SessionExample?dataname=urlEncodedSessionName&datavalue=urlEncodedSessionValue"));
  out.println("\" >URL encoded </a>");

  out.println("</body>");
  out.println("</html>");

  out.println("</body>");
  out.println("</html>");
 }

 public void doPost(HttpServletRequest request, HttpServletResponse response)
   throws IOException, ServletException {
  doGet(request, response);
 }

}
JSP Servlet Guide - Tutorials

Wednesday, August 4, 2010

Java Servlet Example / Sample code to read and create session objects

No comments:

Post a Comment
