SessionDemo

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SessionDemo

public class SessionDemo extends HttpServlet {

public void process(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

 HttpSession session=request.getSession(true);
 Integer counter=(Integer)session.getAttribute("counter");

 if(counter == null){
 counter=new Integer(1);
 }else{
 counter=new Integer(counter.intValue()+1);
 }
 session.setAttribute("counter", counter);
 session.setMaxInactiveInterval(3600);

 response.setContentType("text/html;charset=utf-8");
 PrintWriter out = response.getWriter();
 out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
 out.println("<HTML>");
 out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
 out.println(" <BODY>");

 out.println("你已经访问了"+counter+"次");

 if(session.isNew()){
 out.println("这是新创建的一个session");
 }else{
 out.println("这不是新创建的一个session");
 }
 out.println(" ");
 out.println("session id: "+session.getId()+" ");
 out.println("last accessed time: "+new Date(session.getLastAccessedTime())+" ");
 out.println("session create is: "+new Date(session.getCreationTime())+" ");
 out.println("max inactive interval: "+session.getMaxInactiveInterval()+" ");
 out.println("session中的对象:");
 Enumeration e=session.getAttributeNames();
 String name=null;
 while(e.hasMoreElements()){
 name=(String)e.nextElement();
 out.println("session name: "+name+" ");
 out.println("session valueL: "+session.getAttribute(name)+" ");
 }

 out.println("</BODY>");
 out.println("</HTML>");
 out.flush();
 out.close();

}
/**
* The doGet method of the servlet. 
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
 throws ServletException, IOException {

process(request,response);

}

/**
* The doPost method of the servlet. 
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

process(request,response);

}

}