Examples of using HttpSession ?

Example of using HttpSession :

We are setting the attribute in the session scope in one servlet and getting that value from the session scope in another servlet. To set the attribute in the session scope, we have used the setAttribute() method of HttpSession interface and to get the attribute, we have used the getAttribute method.

index.html

1.    <form action="servlet1">  

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

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

4.    </form>  

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

FirstServlet.java

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 doGet(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.         HttpSession session=request.getSession();  

18.         session.setAttribute("uname",n);  

19.   

20.         out.print("<a href='servlet2'>visit</a>");  

21.                   

22.         out.close();  

23.   

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

25.     }  

26.   

27. }  

import java.io.*; import javax.servlet.*; import javax.servlet.http.*; public class FirstServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response){ try{ response.setContentType("text/html"); PrintWriter out = response.getWriter(); String n=request.getParameter("userName"); out.print("Welcome "+n); HttpSession session=request.getSession(); session.setAttribute("uname",n); out.print("<a href='servlet2'>visit</a>"); 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 doGet(HttpServletRequest request, HttpServletResponse response)  

8.            try{  

9.      

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

11.         PrintWriter out = response.getWriter();  

12.           

13.         HttpSession session=request.getSession(false);  

14.         String n=(String)session.getAttribute("uname");  

15.         out.print("Hello "+n);  

16.   

17.         out.close();  

18.   

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

20.     }  

21.       

22.   

23. }  

import java.io.*; import javax.servlet.*; import javax.servlet.http.*; public class SecondServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) try{ response.setContentType("text/html"); PrintWriter out = response.getWriter(); HttpSession session=request.getSession(false); String n=(String)session.getAttribute("uname"); out.print("Hello "+n); 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>

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