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Thread: Question about sessions

  1. #1
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    Default Question about sessions

    Hi all. I have to make an HTML form, in which to enter data-first name of a student and his numerical ID.This information must be saved in the servlet's session.After entering the student's data, the user must be able to go back and enter another student, or see all names entered so far with their ID's. I am learning about JAVA servlets and sessions now, and will be very glad if you can help me with this, or at least give me some idea what to do


  2. #2
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    Default Re: Question about sessions

    That's the code of the form:

    <html>
    <head>
    <title></title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    </head>
    <body>
    <form action="">
    <p align="center">
    Enter student name: <input name="name" type="text"/>
    Enter student ID: <input name="id" type="text"/><br>
    </p>
    <p align="center"> <input name="sb1" type="submit" value="Submit"/></p>



    </form>
    </body>
    </html>

  3. #3
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    Default Re: Question about sessions

    You need to store each user into a vector and then store the vector as a session variable.

    Take a look at java shopping carts for a better understanding


    ...
    public void doGet(HttpServletRequest req, HttpServletResponse response) throws ServletException, IOException {
    response.setContentType("text/html");
    PrintWriter out = response.getWriter();
    HttpSession session = req.getSession(true);

    String username=(String)req.getParameter("username");
    if (username==null) { username="";}


    Vector allusers=new Vector();
    if (!username.equals("")) {
    allusers.addElement(username);

    allusers = (Vector) session.putValue("getAttribute("cart");
    session.setAttribute("AllUsers", allusers);
    }

    //retrieve
    allusers = (Vector) session.getAttribute("AllUsers");
    //Error check allusers if more than 0 {
    out.println("historic users:");
    for (int a=0; a < allusers.size(); a++) {
    String users=(String)allusers.elementAt(a);
    out.println(users);
    }

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