Access to every page after loging

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2.33/5 (2 votes)

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Hey Friends,
I'm doing a project using JAVA,OOP and DAO techniques. In my project users can access pages after login. as an example i have a menu page which can see after login. think if some one trying to go to this page without login. then it should go to the login page with an error message.think I have 15 jsps and 10 servlets.Inside those there are so many attributes. cannot code same thing in every page.so my question is how to do that easily using DAO or OOP techniques?

Here is my UserServlet.java code

Java

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		String operation = request.getParameter("operation");
		if(operation!=null && operation.equalsIgnoreCase("displayMenu")){
			displayHomePage(request,response);
		}
	}
	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		String operation = request.getParameter("operation");
		if(operation!=null && operation.equalsIgnoreCase("login")){
			loginDetail(request,response);
		}else if(operation!=null && operation.equalsIgnoreCase("logout")){
			logoutSession(request,response);
		}
	}	
	private void loginDetail(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{
		
		User u = new User();
		UserService us =new UserServiceImpl() ;
		
		String Uname = request.getParameter("txtUname");		
		String Pwrd = request.getParameter("txtPwrd");	
		
		u.setUname(Uname);
		u.setPwrd(Pwrd);
		
		System.out.println(Uname+""+Pwrd);
		try {
			if(us.Userlogin(u.getUname(),u.getPwrd())){
				String message = "Thank you, " + Uname +"..You are now logged into the system";			    
				request.setAttribute("message", message);
				RequestDispatcher rd = getServletContext().getRequestDispatcher("/menu.jsp");
				rd.forward(request, response); 
				HttpSession session = request.getSession(true);
			    session.setAttribute("loggedUser", u);
			    String reqUrl = (String)session.getAttribute("requestedURL");
			    session.removeAttribute("requestedURL");
				response.sendRedirect(reqUrl);				
			}else {
				String message = "You have to register first or check Your user name password again!";				
				request.setAttribute("loginMsg", message);
				RequestDispatcher rd = getServletContext().getRequestDispatcher("/login2.jsp");
				rd.forward(request, response); 
			}
		} catch (Exception e) {
			// TODO Auto-generated catch block			
			e.printStackTrace();
		}
	}
	private void logoutSession(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{
        
	    HttpSession  session = request.getSession();
	    session.invalidate();
		try{
			String message = "Logout!";	   
	        session.removeAttribute("loggedUser");  
	        session.invalidate();
			request.setAttribute("loginMsg", message);
			response.sendRedirect(request.getContextPath() + "/login2.jsp");
		}catch(Exception e){
			e.printStackTrace();
		}
	}	
	private void displayHomePage(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException{
		HttpSession session = request.getSession(true);
		String nextPage = "/login2.jsp";
		if(session!=null){
			User user = (User)session.getAttribute("loggedUser");
			if(user!=null){
				nextPage = "menu.jsp";
			}else{
				request.setAttribute("errorMsg","Please Login...!");	
				session.setAttribute("requestedURL", "login?operation=displayMenu");
			}
		}
		//response.sendRedirect(nextPage);
		request.getRequestDispatcher(nextPage).forward(request, response);
		//response.sendRedirect(request.getContextPath() + "/Login.jsp");		
	}
}

home.jsp// index page of the project

ASP.NET

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
	<p>Welcome to DemoBank</p>	
	<p><a href="login?operation=displayMenu">Go to home page</a></p>	
</body>
</html>

home.jsp(index page of the project)->login.jsp->other pages(if login success)

if someone go to other pages it should directs to login.jsp->then it directs to above successfull path

Posted 8-Jul-13 1:23am

mali_angel

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Comments

[no name] 8-Jul-13 9:59am

use Filter

mali_angel 8-Jul-13 23:01pm

Can you explain step by step?

[no name] 9-Jul-13 3:35am

you need a filter servlet, filter servlets are invoked before the actual resource, so you would have some checks to decide forward the request to the actual page or another page. a filter servlet is bind to some URLs, for example an admin filter servlet are listen to "/_admin/*" pattern, it means everything under _admin/ folder/name, so here you set the all URLs that need login to the filter, and just checks that user has loged in or not, if yes forward to the actual page, else forward to login page :D, if you still have problem I would provide a simple example too

mali_angel 9-Jul-13 4:12am

please give Your example.

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mali_angel · Answer 1 · 2013-07-09T00:39:00

Here is my FilterRequest.java file code

Java

public void init(FilterConfig filterConfig) throws ServletException {
		this.filterConfig = filterConfig;
	}
	public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException {
		try{
	      //HttpServletResponse responce = (HttpServletResponse) resp;
	      //HttpServletRequest request = (HttpServletRequest) req;	      
	      //String servletPath = request.getServletPath();
	      HttpSession session =  ((HttpServletRequest) req).getSession();
	      User u = (User) session.getAttribute("loggedUser");
	      System.out.println(u);
	      if (u!= null)
	      {
	         chain.doFilter(req, resp);
	         return;
	      }
	      /*if (servletPath.equals("/login2.jsp"))
	      {
	         chain.doFilter(req, resp);
	         return;
	      }*/else{
			String message = "Please Login!";				
			req.setAttribute("loginMsg", message);
			RequestDispatcher rd = getServletContext().getRequestDispatcher("/login2.jsp");
			rd.forward(req, resp); 
	      }	      
		}catch(Exception e){
			e.printStackTrace();
		}
	}

This is my web.xml Mapping code..

XML

<filter>
        <filter-name>FilterRequest</filter-name>
        <filter-class>com.mobitel.bankdemo.web</filter-class>
</filter>
    <filter-mapping>
        <filter-name>FilterRequest</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

when I run the project from the beginning it says "

SQL

The requested resource is not available.

"

Where i went wrong? please guide me