import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.io.PrintWriter;
public class SessionServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
System.out.println("SessionServlet -- service");
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("");
out.println("SessionServlet");
out.println("");
String value = request.getParameter("value");
HttpSession session = request.getSession(true);
out.println("
the previous value is " +
(String) session.getAttribute("value"));
out.println("
the current value is " + value);
session.setAttribute("value", value);
out.println("
");
out.println("");
out.println("");
out.println("");
}
}