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Ramakrishna

servlets
3 Answer(s) 4 years and 8 months ago
Posted in : Servlet Interview Questions

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September 19, 2008 at 8:11 PM

Hey ;

R u reading basic concept or not ?
how u set atrributes with requestDispatcher

See below how to use setAttribute();
it is used with request parameter or context parameter;

Test.java
-------------

public class Test extends HttpServlet {

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

response.setContentType("text/html");
PrintWriter out = response.getWriter();
request.setAttribute("name", "Raj");
request.setAttribute("age", "12");
RequestDispatcher rd = request.getRequestDispatcher("/Test2");
rd.forward(request, response);
}

}

Test2.java
-----------

public class Test2 extends HttpServlet {

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

PrintWriter out = response.getWriter();
String name = (String)request.getAttribute("name");
String age = (String)request.getAttribute("age");
System.out.println(name + " "+ age);
out.write(name+age);
}

}

Thanks
Rajanikant

December 29, 2010 at 4:34 PM

SERVLET FIRST @@@@@@@@@@@@@@@@@@

package org.com;

import java.io.*; import java.net.*;

import javax.servlet.*; import javax.servlet.http.*;

public class Servlet_1 extends HttpServlet {

int a,b,c,d,sum1 ;

RequestDispatcher rd;

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {




  a=Integer.parseInt(request.getParameter("txtT1"));
  b=Integer.parseInt(request.getParameter("txtT2"));
  c=Integer.parseInt(request.getParameter("txtT3"));


  int  sum1=a+b+c;


  request.setAttribute("ID", "101");
  request.setAttribute("NAME", "MUKESH KUMAR PRASAD");
  request.setAttribute("AGE", "21");
  request.setAttribute("ADDRESS", "12");
  request.setAttribute("PHONE", "9871282091");
  request.setAttribute("CITY", "INDIAN");

  response.setContentType("text/html;charset=UTF-8");

    PrintWriter out = response.getWriter();

     rd=request.getRequestDispatcher("Servlet_2");
     rd.forward(request,response);

    out.println("<html>");
    out.println("<head>");
    out.println("<title>Servlet Servlet_1</title>");
    out.println("</head>");
    out.println("<body>");
    out.println("<h1>Servlet Servlet_1 at " + request.getContextPath () + "</h1>");
    out.println("</body>");
    out.println("</html>");

    out.close();
}

protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
    processRequest(request, response);
}

protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
    processRequest(request, response);
}

public String getServletInfo() {
    return "Short description";
}

}

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

SECOND SERVLET Servlet_2.java

package org.com;

import java.io.*; import java.net.*;

import javax.servlet.*; import javax.servlet.http.*;

public class Servlet_2 extends HttpServlet {

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

   int sum1;

    response.setContentType("text/html;charset=UTF-8");
    PrintWriter out = response.getWriter();
    sum1=Integer.parseInt(request.getParameter("txtT1"))

+Integer.parseInt(request.getParameter("txtT2")) +Integer.parseInt(request.getParameter("txtT3")); out.println(""); out.println(""); out.println("Servlet Servlet_2"); out.println(""); out.println("");

    out.println("<h1>Servlet Servlet_2 at " + request.getContextPath () + "</h1>");

    out.println(" Servlet_2 ");


    out.println(sum1);
        String ID = (String)request.getAttribute("ID");
        String NAME = (String)request.getAttribute("NAME");
        String AGE=(String)request.getAttribute("AGE");
        String ADDRESS=(String)request.getAttribute("ADDRESS");
        String PHONE=(String)request.getAttribute("PHONE");
        String CITY =(String)request.getAttribute("CITY");

        out.println(ID+" "+" "+NAME+" "+AGE+" "+ADDRESS+" "+PHONE+" "+CITY);



    out.println("</body>"); 
    out.println("</html>");

    out.close();
}


protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
    processRequest(request, response);
}

protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
    processRequest(request, response);
}


public String getServletInfo() {
    return "Short description";
}
}

December 29, 2010 at 4:34 PM

SERVLET FIRST @@@@@@@@@@@@@@@@@@

package org.com;

import java.io.*; import java.net.*;

import javax.servlet.*; import javax.servlet.http.*;

public class Servlet_1 extends HttpServlet {

int a,b,c,d,sum1 ;

RequestDispatcher rd;

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {




  a=Integer.parseInt(request.getParameter("txtT1"));
  b=Integer.parseInt(request.getParameter("txtT2"));
  c=Integer.parseInt(request.getParameter("txtT3"));


  int  sum1=a+b+c;


  request.setAttribute("ID", "101");
  request.setAttribute("NAME", "MUKESH KUMAR PRASAD");
  request.setAttribute("AGE", "21");
  request.setAttribute("ADDRESS", "12");
  request.setAttribute("PHONE", "9871282091");
  request.setAttribute("CITY", "INDIAN");

  response.setContentType("text/html;charset=UTF-8");

    PrintWriter out = response.getWriter();

     rd=request.getRequestDispatcher("Servlet_2");
     rd.forward(request,response);

    out.println("<html>");
    out.println("<head>");
    out.println("<title>Servlet Servlet_1</title>");
    out.println("</head>");
    out.println("<body>");
    out.println("<h1>Servlet Servlet_1 at " + request.getContextPath () + "</h1>");
    out.println("</body>");
    out.println("</html>");

    out.close();
}

protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
    processRequest(request, response);
}

protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
    processRequest(request, response);
}

public String getServletInfo() {
    return "Short description";
}

}

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

SECOND SERVLET Servlet_2.java

package org.com;

import java.io.*; import java.net.*;

import javax.servlet.*; import javax.servlet.http.*;

public class Servlet_2 extends HttpServlet {

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

   int sum1;

    response.setContentType("text/html;charset=UTF-8");
    PrintWriter out = response.getWriter();
    sum1=Integer.parseInt(request.getParameter("txtT1"))

    out.println("<h1>Servlet Servlet_2 at " + request.getContextPath () + "</h1>");

    out.println(" Servlet_2 ");


    out.println(sum1);
        String ID = (String)request.getAttribute("ID");
        String NAME = (String)request.getAttribute("NAME");
        String AGE=(String)request.getAttribute("AGE");
        String ADDRESS=(String)request.getAttribute("ADDRESS");
        String PHONE=(String)request.getAttribute("PHONE");
        String CITY =(String)request.getAttribute("CITY");

        out.println(ID+" "+" "+NAME+" "+AGE+" "+ADDRESS+" "+PHONE+" "+CITY);



    out.println("</body>"); 
    out.println("</html>");

    out.close();
}


protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
    processRequest(request, response);
}

protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
    processRequest(request, response);
}


public String getServletInfo() {
    return "Short description";
}
}

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