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anky
jquery ajax and servlet
0 Answer(s)      2 years and 8 months ago
Posted in : JSP-Servlet


hi.. i am using jquery,ajax and servlet in ma application.On the webpage when user selects id from the drop downbox and ckicks on "show person " button i am calling a servlet "GetPerson" through ajax inside this servlet i have set some session variables "myID" n "name"...when it returns back to the ajax function i load hello.jsp file in the

tag but in hello.jsp everytime i access the session variable "myID" the value is same irrespective of the id selected in the dropdown. m posting ma code here

//models/People.java package models;

public class People {

private String people[] 
         = new String[] { "Bob", "Bill", "Jan", "Ellen", "Ken", };
  public int getNumPeople() { return people.length; }
  public String getPerson(int num) { return people[num]; }

}

//servlet/GetPerson.java

package servlet;

import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession;

import java.io.*; //import javax.servlet.ServletException; //import javax.servlet.http.*; import models.People; /** * Servlet implementation class GetPerson */ @WebServlet("/GetPerson") public class GetPerson extends HttpServlet { private People people = new People();

protected void processRequest(
        HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
     System.out.println("inside servlet");
    HttpSession session = request.getSession(true);
    response.setContentType("text/html;charset=UTF-8");
    PrintWriter out = response.getWriter();

    try {
      String id = request.getParameter("id");
      session.setAttribute("myName",id );
      System.out.println(session.getAttribute("myName"));
      out.print(people.getPerson(Integer.parseInt(id)));
      session.setAttribute("name1",people.getPerson(Integer.parseInt(id)));
    } finally {
      out.close();
    }

}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // TODO Auto-generated method stub
    processRequest(request,response);
}

}

//index.jsp <%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%> <%@ page import="java.util.*" %> <%@ page import="models.*" %> Selection with JavaScript Display

AJAX "get person"

<select id="sel">
  <% for( int i = 0; i < people.getNumPeople(); ++i ) { %>
  <option value="<%=i%>"><%=i%></option>
  <% } %>
</select>
<button id="button">Show Person</button>
<br /><br />
Selected person: <span id="out"></span><span id="out1"></span>

//hello.jsp <%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%> Insert title here <% String id =(String)session.getAttribute("myName"); out.print("hi:"+id); session.removeAttribute("myName"); {%>

<%=id%>

<%} %>

try jquery name<%=id%>

anyone plz tell me how could i do this??? thanks alot!!


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