After user authentication, start a session. Display "Welcome [username]" as the response along with a link that hits another Servlet. From this other servlet, send the response "You are [username]" by retrieving the username information from the session as an attribute.
1) Servlet 1: Code here - http://www.javaissues.com/2011/02/servlets-handling-get-request.html
2) Servlet 2 - PostServlet.java
3) Servlet 3 - LinkedServlet.java
web.xml configuration for Servlets 2 & 3 (for configuration of Servlet 1, go to link specified above)
1) Servlet 1: Code here - http://www.javaissues.com/2011/02/servlets-handling-get-request.html
2) Servlet 2 - PostServlet.java
package info.icontraining.servlets;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.http.*;
public class PostServlet extends HttpServlet {
public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException {
PrintWriter out = response.getWriter();
String username = request.getParameter("user");
String passwd = request.getParameter("pass");
out.println("<html>");
out.println("<head><title>Post Servlet Example</title></head>");
out.println("<body><h1>");
if (username.equals("dinesh") && passwd.equals("dinesh")) {
out.println("Welcome " + username +"!<br/><br/>");
HttpSession session = request.getSession();
session.setAttribute("username",username);
out.println("<a href=\"linkedServlet\">Click here</a>");
} else {
out.println("Invalid username/passwd. Go back and try again.");
}
out.println("</h1></body></html>");
out.close();
}
}
3) Servlet 3 - LinkedServlet.java
package info.icontraining.servlets;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.http.*;
public class LinkedServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<head><title>Session Management Example</title></head>");
out.println("<body><h1>");
HttpSession session = request.getSession();
String username = (String)session.getAttribute("username");
out.println("You are " + username +"!");
out.println("</h1></body></html>");
out.close();
}
}
web.xml configuration for Servlets 2 & 3 (for configuration of Servlet 1, go to link specified above)
<servlet>
<servlet-name>postServlet</servlet-name>
<servlet-class>info.icontraining.servlets.PostServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>postServlet</servlet-name>
<url-pattern>/formurl</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>linkedServlet</servlet-name>
<servlet-class>info.icontraining.servlets.LinkedServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>linkedServlet</servlet-name>
<url-pattern>/linkedServlet</url-pattern>
</servlet-mapping>
good
ReplyDelete