Practical 16

make seperate file for each code
<!DOCTYPE html>
<html lang="en">
<head>
    <title>Login</title>
</head>
<body>
    <center>
        <h1>Enter your name</h1>
            <form action="login" method="get">  
                Name:<input type="text" name="uname"/><br/>
                <input type="submit" value="login"/>  
            </form>  
    </center>

</body>
</html>



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import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class Practical16 extends HttpServlet{
    public void doGet(HttpServletRequest req,HttpServletResponse res) throws ServletException,IOException{
        res.setContentType("text/html");
        PrintWriter pw = res.getWriter();

        HttpSession session =req.getSession();
        String username = req.getParameter("uname");
        pw.println("<h1>Welcome ! "+username);
        pw.println("Session id : "+session.getId());

        session.setAttribute("username", username);
        pw.print("<a href='servlet2'>visit</a>");  
                  
        pw.close();  

    }
    
}
____________________________________________

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;

public class practical16b extends HttpServlet{
    
    public void doGet(HttpServletRequest req,HttpServletResponse res) throws ServletException,IOException{
    
        res.setContentType("text/html");
        PrintWriter pw = res.getWriter();
        HttpSession session =req.getSession();
        String n = (String)session.getAttribute("username");

        pw.println("Username : "+n);
        pw.close();
    
    }
}
_____________________________________________
<web-app>

<servlet>
<servlet-name>practical16</servlet-name>
<servlet-class>Practical16</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>practical16</servlet-name>
<url-pattern>/login</url-pattern>
</servlet-mapping>


<servlet>
<servlet-name>practical16b</servlet-name>
<servlet-class>Practical16b</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>practical16b</servlet-name>
<url-pattern>/servlet2</url-pattern>
</servlet-mapping>

</web-app>