use the Servlet API to manage session information : Session « Servlet « Java Tutorial

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Java Tutorial » Servlet » Session 
25. 5. 8. use the Servlet API to manage session information
import java.io.IOException;
import java.io.PrintWriter;

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

public class Counter extends HttpServlet {
  static final String COUNTER_KEY = "Counter.count";

  public void doGet(HttpServletRequest req, HttpServletResponse respthrows ServletException,
      IOException {
    HttpSession session = req.getSession(true);
    resp.setContentType("text/html");
    PrintWriter out = resp.getWriter();
    int count = 1;
    Integer i = (Integersession.getAttribute(COUNTER_KEY);
    if (i != null) {
      count = i.intValue() 1;
    }
    session.setAttribute(COUNTER_KEY, new Integer(count));
    out.println("<html>");
    out.println("<head>");
    out.println("<title>Session Counter</title>");
    out.println("</head>");
    out.println("<body>");
    out.println("Your session ID is <b>" + session.getId());
    out.println("</b> and you have hit this page <b>" + count
        "</b> time(s) during this browser session");

    out.println("<form method=GET action=\"" + req.getRequestURI() "\">");
    out.println("<input type=submit " "value=\"Hit page again\">");
    out.println("</form>");
    out.println("</body>");
    out.println("</html>");
    out.flush();
  }
}
25. 5. Session
25. 5. 1. Servlet Session Info
25. 5. 2. Servlet Session Snoop
25. 5. 3. Servlet Session Max Inactive Interval
25. 5. 4. Servlet Session Creation Last Access Time
25. 5. 5. Servlet Session Check
25. 5. 6. Get Set Session Value in a Servlet
25. 5. 7. Get Set SessionAttributes in Servlet
25. 5. 8. use the Servlet API to manage session information
25. 5. 9. Session Events
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