2b. Cookies to store the number of times a user has visited servlet


index.html

<html>
<head>
<title>Cookie Demo</title>
</head>
<body>
<form action="Page1" >
Enter Your Name <input type="text" name="txtName">
<br> 
<input type="submit" value="~~~ Click to Enter ~~~"> </form>
</body>
</html>




Page1.java

package mypack;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Cookie;
public class Page1 extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException { 
       response.setContentType("text/html;charset=UTF-8"); 
       PrintWriter out = response.getWriter();
       out.println("<html><head><title>Page1</title></head>”);
       out.println("<body bgcolor=pink >");
       String uname = request.getParameter("txtName");
       out.println("<h1>~~~ Welcome "+uname+"</h1>");
       Cookie ck1 = new Cookie("username", uname);
       Cookie ck2 = new Cookie("visit","1");
       response.addCookie(ck1); 
       response.addCookie(ck2);
       out.println("<h1><a href=Page2 >Click to visit Page 2 </a></h1>");
       out.println("</body>");
       out.println("</html>");
}
}


Page2.java

package mypack;

import java.io.*;
import javax.servlet.ServletException;
import javax.servlet.http.*;
public class Page2 extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {                  response.setContentType("text/html;charset=UTF-8"); 
       PrintWriter out = response.getWriter();
      out.println("<html><head><title>Page2</title></head>");
      out.println("<body bgcolor=yellow >");
      Cookie [] ck = request.getCookies();
      for(int i=0;i<ck.length;i++){
      if(ck[i].getName().equals("visit")){
      int count = Integer.parseInt(ck[i].getValue())+1;
      out.println("<h1>Visit No : "+count+"</h1>");
      ck[i] = new Cookie("visit",count+"");
      response.addCookie(ck[i]);
}
else {
out.println(ck[i].getName()+ " = "+ck[i].getValue());     }
out.println("<h1><a href=Page3 >Click to visit Page 3 </a></h1>");
out.println("<h1><a href=Page4 >Click to visit Page 4 </a></h1>");
out.println("<h1><a href=Page5 >Click to visit Page 5 </a></h1>");
out.println("</body>");
out.println("</html>");
}  
}
Repeat the code from Page2.java for Page3.java, Page4.java and Page5.java with relevant changes.






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