Problem while posting data from a servlet.

[khalid ahmed]

hi all ,
I created a servlet,from the servlet i posting data to the jsp.
But all the data is public i.e user can be able to see the data in the url.
I tried using post method from the servlet still i can be able to see all the data in the url.
I dont want the user should see the data in the url.
I read something like RequestDispatcher but its not working.
how to solve this.

 
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
doPost(req, resp);
}
public void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
String page="DisplayData.jsp";
String value=getUsernameDetails(user);
System.out.prinln("value="+value);  //it prints like valid&designation=Manager&sal=2000
 
page=page+value;
 

if (value.startWith("Valid"))
   {
          RequestDispatcher dispatcher = req.getRequestDispatcher(page);
 if (dispatcher != null){
                                       dispatcher.forward(req, resp);
 }
   }
}
   

[Bear Bibeault]

You haven't given us anywhere near enough information. How is the servlet being invoked? What does the getUsernameDetails() method do? And it appears that you are not posting from this servlet, but to it.

Also, a post will not cause the doGet() method to be called.
[ November 21, 2008: Message edited by: Bear Bibeault ]

[khalid ahmed]

hi,
Here is the details

 <form action="servletname" method="post" name="user.jsp">
 <input type="text" value="" name="user">
 <input type="submit" value="submit" name="submit">

the above code will call the servlet and the servlets check the info and respond to displaydata.jsp

 
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
doPost(req, resp);
}
public void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
 
String value=getUsernameDetails(user);
System.out.prinln("value="+value);  //it prints like valid&designation=Manager&sal=2000
 
String page="DisplayData.jsp?result="+value;
 

if (value.startWith("Valid"))
   {
          RequestDispatcher dispatcher = req.getRequestDispatcher(page);
 if (dispatcher != null){
                                       dispatcher.forward(req, resp);
 }
   }
}
   

[Bear Bibeault]

Sigh. Without knowing what getUsernameDetails() does, I cannot help you.

[khalid ahmed]

hi,
getUsernameDetails will retrieve the datafrom the database

String value=getUsernameDetails(user);

System.out.prinln("value="+value);
//in system.out.println
//value=Valid&designation=Manager&sal=2000

[khalid ahmed]

hi ,
i mean i can see this parameter in the url
value=Valid&designation=Manager&sal=2000

and my query is i dont want to see them in the url

i am not sure this is the soultion or not

 RequestDispatcher dispatcher = req.getRequestDispatcher(page);
 if (dispatcher != null){
                  dispatcher.forward(req, resp);
 }
 

[Bear Bibeault]

Originally posted by khalid ahmed:
getUsernameDetails will retrieve the datafrom the database

String value=getUsernameDetails(user);

System.out.prinln("value="+value);
//in system.out.println
//value=Valid&designation=Manager&sal=2000

If value is coming from the database, what does this have to do with URLs?

[khalid ahmed]

String page="DisplayData.jsp?result="+value; 
if (value.startWith("Valid"))   {    
      RequestDispatcher dispatcher = req.getRequestDispatcher(page);
     if (dispatcher != null){                                       dispatcher.forward(req, resp); }   
      }
     }
 

[khalid ahmed]

hi,
The values comes from db and pass to the url like below.

String page="DisplayData.jsp?result="+value; 
if (value.startWith("Valid"))   {    
      RequestDispatcher dispatcher = req.getRequestDispatcher(page);
     if (dispatcher != null){                                       dispatcher.forward(req, resp); }   
      }
     }
 

[khalid ahmed]

hi all,
Still i am facing teh problem.
Any help..

[Vijitha Kumara]

What I can say about what you are trying do is that, can't you set the values in appropriate scope (may be request,session etc..) and let the JSP (in this case) get the values from that scope?

[Neha Kathuriaa]

I think your doGet method is getting invoked even though you have called doPost() in doGet(). But it will show whatever you enter into the jsp on the URL.
Thanks 

[khalid ahmed]

hi,
I can set the session variable in the servlet and get the variable in a jsp using response.sendredirect method.

like

session.setAttribute("value1",v1);
session.setAttribute("value2",v2);
session.setAttribute("value3",v3);
resp.sendRedirect(resp.encodeRedirectUrl("DisplayData.jsp"));

and in get the varaible

String designation="";
String Valid="";
String sal="" 
 
if (session.getAttribute("value1")!=null)
          {
             Valid=session.getAttribute("value1").toString();
          }
if (session.getAttribute("value2")!=null)
          {
             designation=session.getAttribute("value2").toString();
          }
if (session.getAttribute("value3")!=null)
          {
             sal=session.getAttribute("value3").toString();
          }
 

i feel if two customers tried with the same time he may get wrong ouput or there will be some issue with lots of sessions.
I think i clean up the session variable somewhere so that it should not be a problem.am i right or correct if i am wrong somewhere .

[Bosun Bello]

I am not exactly clear on what you are asking. I do nto see any instance variables in your servlet though, so why do you think there may be a problem with the session if more than one user access your servlet?
[ November 24, 2008: Message edited by: Bosun Bello ]

[Amol Nayak]

Khalid said.
hi ,
i mean i can see this parameter in the url
value=Valid&designation=Manager&sal=2000

and my query is i dont want to see them in the url

Are you sending a redirect to the client?

You initial form posts the data to the server and you wont see the user parameter in the url.
Now when your request reaches the server What is you requirement?
If you send a redirect, then yes the parameters will be visible in the client's browser as you are constructing the url and adding the parameters to the url as query string.
The question is , do you really require a redirect? Cant you use requestDispatcher.forward()? If you use the forward or include (which happens on server side and transperent to end user) you query string will not be visible in the browser.

[khalid ahmed]

Amol Nayak says
You initial form posts the data to the server and you wont see the user parameter in the url.
Now when your request reaches the server What is you requirement?

If you send a redirect,
then yes the parameters will be visible in the client's browser as you are constructing the url and adding the parameters to the url as query string.

I solved this query string issue by

String page="DisplayData.jsp";
req.setAttribute("result",value);
if (value.startWith("Valid")) 
  { 
     RequestDispatcher dispatcher = req.getRequestDispatcher(page);
     if (dispatcher != null){                                       dispatcher.forward(req, resp); } 
        } 
}

get the variable like request.getAttribute("result") in jsp and its working fine.

The problem with the above code is i couldnt be able to invoke the DisplayData.jsp.

i read in internet

The forward is made server-side, meaning the user will still see the first URL he entered.
Also, you keep the same ~Request object when the second URL is loaded, meaning you can share data using attributes.

The redirect is actually a HTTP response sent to the user asking him to go to another URL, meaning that the URL in his address bar will change. The second URL is then a fully new request.


so i tried this code

 
session.setAttribute("value1",v1);
session.setAttribute("value2",v2);
session.setAttribute("value3",v3);
resp.sendRedirect(resp.encodeRedirectUrl("DisplayData.jsp"));

and in get the varaible

String designation="";
String Valid="";
String sal="" ;
 if (session.getAttribute("value1")!=null) 
         {      
              Valid=session.getAttribute("value1").toString(); 
          }
  if (session.getAttribute("value2")!=null) 
          {    
               designation=session.getAttribute("value2").toString();
          }
  if (session.getAttribute("value3")!=null)    
      {    
         sal=session.getAttribute("value3").toString();          
      } 
 

The storing the session variables concept is working.But i feel somewhere session lost or session exists or may be some prob will arise with session so i feel dispatcher.forward method is good to solve the my query.

As i mentioned if i use dispatcher.forward i cant be able to invoke the jsp?No idea how to solve this.

[Amol Nayak]

Khalid said:
As i mentioned if i use dispatcher.forward i cant be able to invoke the jsp?No idea how to solve this.

What exactly is happening?