Java Servlet Programming

Question

How to send/pass values from one servlet(consider it as one project) to another servlet(consider as another project). It's showing number format exception. Is it correct to pass values in sendredirect method or is there any other way

Example:

File: uzkpk2.java

         String a1=request.getParameter("a[0]");             
         aa1=Integer.parseInt(a1);


         String a2=request.getParameter("a[1]");             
         aa2=Integer.parseInt(a2);


         String a3=request.getParameter("a[2]");             
         aa3=Integer.parseInt(a3);


         String a4=request.getParameter("a[3]");             
         aa4=Integer.parseInt(a4);    


   response.sendRedirect("http://localhost:8080/CSP/czkpk1?y="+y+"&a1="+aa1+"&a2="+aa2+"&a3="+aa3+"&a4="+aa4);
    } 
    catch(Exception e)
    {
        out.println(e);
    }
}

}

File: czkpk1.java

 aaa1=Integer.parseInt(request.getParameter("aa1"));
        aaa2=Integer.parseInt(request.getParameter("aa2"));
        aaa3=Integer.parseInt(request.getParameter("aa3"));
        aaa4=Integer.parseInt(request.getParameter("aa4"));

Depends on what you're trying to do with those servlets. What exactly is your goal? — Mike Baranczak
– Mike Baranczak, Commented Feb 28, 2011 at 5:51

Ankit · Accepted Answer · 2011-02-28 06:45:17Z

1

You are using the wrong request parameter to get the value.

    aaa1=Integer.parseInt(request.getParameter("aa1"));
    aaa2=Integer.parseInt(request.getParameter("aa2"));
    aaa3=Integer.parseInt(request.getParameter("aa3"));
    aaa4=Integer.parseInt(request.getParameter("aa4"));

Instead of this use

    aaa1=Integer.parseInt(request.getParameter("a1"));
    aaa2=Integer.parseInt(request.getParameter("a2"));
    aaa3=Integer.parseInt(request.getParameter("a3"));
    aaa4=Integer.parseInt(request.getParameter("a4"));

since in czkpk1.java you are using the variable names instead of parameters passed in the url present in response.sendRedirect();

And one advice chech for only numeric values before parsing it into string.

The best way to do this is use concept of

Servlet Chaining.

answered Feb 28, 2011 at 6:45

Ankit

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Comments

Umesh Kacha · Accepted Answer · 2011-02-28 06:05:27Z

0

-> Write your value in request context as an attribute using request.setAttribute()

-> After forward the request to second servlet using RequestDispatcher.forward()

-> In second servlet read the value using request.getAttribute()

answered Feb 28, 2011 at 6:05

Umesh Kacha

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