Simple example of Servlet Cookies

Simple example of Servlet Cookies

We are storing the name of the user in the cookie object and accessing it in another servlet. As we know well that session corresponds to the particular user. So if you access it from too many browsers with different values, you will get the different value.

index.html

1.    <form action="servlet1" method="post">  

2.    Name:<input type="text" name="userName"/><br/>  

3.    <input type="submit" value="go"/>  

4.    </form>  

<form action="servlet1" method="post"> Name:<input type="text" name="userName"/><br/> <input type="submit" value="go"/> </form>

1.    import java.io.*;  

2.    import javax.servlet.*;  

3.    import javax.servlet.http.*;  

4.      

5.      

6.    public class FirstServlet extends HttpServlet {  

7.      

8.      public void doPost(HttpServletRequest request, HttpServletResponse response){  

9.        try{  

10.   

11.     response.setContentType("text/html");  

12.     PrintWriter out = response.getWriter();  

13.           

14.     String n=request.getParameter("userName");  

15.     out.print("Welcome "+n);  

16.   

17.     Cookie ck=new Cookie("uname",n);//creating cookie object  

18.     response.addCookie(ck);//adding cookie in the response  

19.   

20.     //creating submit button  

21.     out.print("<form action='servlet2'>");  

22.     out.print("<input type='submit' value='go'>");  

23.     out.print("</form>");  

24.           

25.     out.close();  

26.   

27.         }catch(Exception e){System.out.println(e);}  

28.   }  

29. }  

import java.io.*; import javax.servlet.*; import javax.servlet.http.*; public class FirstServlet extends HttpServlet { public void doPost(HttpServletRequest request, HttpServletResponse response){ try{ response.setContentType("text/html"); PrintWriter out = response.getWriter(); String n=request.getParameter("userName"); out.print("Welcome "+n); Cookie ck=new Cookie("uname",n);//creating cookie object response.addCookie(ck);//adding cookie in the response //creating submit button out.print("<form action='servlet2'> "); out.print("<input type='submit' value='go'>"); out.print("</form> "); out.close(); }catch(Exception e){System.out.println(e);} } }

SecondServlet.java

1.    import java.io.*;  

2.    import javax.servlet.*;  

3.    import javax.servlet.http.*;  

4.      

5.    public class SecondServlet extends HttpServlet {  

6.      

7.    public void doPost(HttpServletRequest request, HttpServletResponse response){  

8.        try{  

9.      

10.     response.setContentType("text/html");  

11.     PrintWriter out = response.getWriter();  

12.       

13.     Cookie ck[]=request.getCookies();  

14.     out.print("Hello "+ck[0].getValue());  

15.   

16.     out.close();  

17.   

18.          }catch(Exception e){System.out.println(e);}  

19.     }  

20.       

21.   

22. }  

import java.io.*; import javax.servlet.*; import javax.servlet.http.*; public class SecondServlet extends HttpServlet { public void doPost(HttpServletRequest request, HttpServletResponse response){ try{ response.setContentType("text/html"); PrintWriter out = response.getWriter(); Cookie ck[]=request.getCookies(); out.print("Hello "+ck[0].getValue()); out.close(); }catch(Exception e){System.out.println(e);} } }

web.xml

1.    <web-app>  

2.      

3.    <servlet>  

4.    <servlet-name>s1</servlet-name>  

5.    <servlet-class>FirstServlet</servlet-class>  

6.    </servlet>  

7.      

8.    <servlet-mapping>  

9.    <servlet-name>s1</servlet-name>  

10. <url-pattern>/servlet1</url-pattern>  

11. </servlet-mapping>  

12.   

13. <servlet>  

14. <servlet-name>s2</servlet-name>  

15. <servlet-class>SecondServlet</servlet-class>  

16. </servlet>  

17.   

18. <servlet-mapping>  

19. <servlet-name>s2</servlet-name>  

20. <url-pattern>/servlet2</url-pattern>  

21. </servlet-mapping>  

22.   

23. </web-app>  

<web-app> <servlet> <servlet-name>s1</servlet-name> <servlet-class>FirstServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>s1</servlet-name> <url-pattern>/servlet1</url-pattern> </servlet-mapping> <servlet> <servlet-name>s2</servlet-name> <servlet-class>SecondServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>s2</servlet-name> <url-pattern>/servlet2</url-pattern> </servlet-mapping> </web-app>

Now Run This Application :

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