JSP to Servlet :-
Create Web project and design JSP Page and create form
1.1) Create Web Page using JSP
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<form action="AdditionServlet" method="post">
<h1>Addition Form</h1>
<hr>
<input type="text" name="txtnum1" placeholder="Enter First Number" value="<% if(request.getParameter("q1")!=null)
{
out.print(request.getParameter("q1"));
} %>" /><br><br>
<input type="text" name="txtnum2" placeholder="Enter Second Number" value="<% if(request.getParameter("q2")!=null)
{
out.print(request.getParameter("q2"));
} %>"/><br><br><br>
<input type="submit" name="btnsubmit" value="Click" />
<br><br>
</form>
<%
if(request.getParameter("q")!=null)
{
out.print(request.getParameter("q"));
}
%>
</body>
</html>
Create Web project and design JSP Page and create form
1.1) Create Web Page using JSP
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<form action="AdditionServlet" method="post">
<h1>Addition Form</h1>
<hr>
<input type="text" name="txtnum1" placeholder="Enter First Number" value="<% if(request.getParameter("q1")!=null)
{
out.print(request.getParameter("q1"));
} %>" /><br><br>
<input type="text" name="txtnum2" placeholder="Enter Second Number" value="<% if(request.getParameter("q2")!=null)
{
out.print(request.getParameter("q2"));
} %>"/><br><br><br>
<input type="submit" name="btnsubmit" value="Click" />
<br><br>
</form>
<%
if(request.getParameter("q")!=null)
{
out.print(request.getParameter("q"));
}
%>
</body>
</html>
2)
import java.io.IOException;
import java.io.PrintStream;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
*
* @author Hp
*/
public class AdditionServlet extends HttpServlet {
/**
* Processes requests for both HTTP <code>GET</code> and <code>POST</code>
* methods.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
int num1 = Integer.parseInt(request.getParameter("txtnum1"));
int num2 = Integer.parseInt(request.getParameter("txtnum2"));
int num3 = num1+num2;
// out.write("result is "+num3);
response.sendRedirect("index.jsp?q="+num3+"&q1="+num1+"&q2="+num2);
}
// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
/**
* Handles the HTTP <code>GET</code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Handles the HTTP <code>POST</code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Returns a short description of the servlet.
*
* @return a String containing servlet description
*/
@Override
public String getServletInfo() {
return "Short description";
}// </editor-fold>
}
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