Getting error 404 when iam running a simple login servlet in tomcat

hi
this is my Login.java
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class Login extends HttpServlet
     public void doPost(HttpServletRequest rq, HttpServletResponse rs)
          String username =rq.getParameter("username");
          String password =rq.getParameter("password");
try{
          rs.setContentType("text/html");
          PrintWriter out=rs.getWriter();
          out.println("<html><body>");
          out.println("thank u, " + username + "you r logged sucessfully");
          out.println("</body></html>");
          out.close();
          }catch(Exception e){
               e.printStackTrace();
i have saved in the form ofC:\Program Files\apache-tomcat-4.1\webapps\sravan\WEB-INF\classes\Login.class
where sravan is my folder
step 2: Login.html
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title>login page</title></head>
<body>
<h1> WELCOME TO THE SERVLET HOME PAGE</h1>
ENTER UR USERNAME AND PASSWORD
<form action="/sravan/Login" method="Post">
     username<input type="text" name="username" >
     password<input type="password" name="password" >
     <input type="submit" value="submit"></form>
     </body>
</html>
i have saved in the form C:\Program Files\apache-tomcat-4.1\webapps\sravan\Login.html
step3:
my web.xml
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<display-name>beginning j2ee</display-name>
<servlet>
<servlet-name>Login</servlet-name>
<servlet-class>Login</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Login</servlet-name>
<url-pattern>Login</url-pattern>
</servlet-mapping>
</web-app>
i have saved in C:\Program Files\apache-tomcat-4.1\webapps\sravan\WEB-INF\web.xml
step4:
here is my server.xml
<Context path="/sravan" docBase="sravan" debug="0" reloadable="true" privileged="true"/>
saved in C:\Program Files\apache-tomcat-4.1\webapps\sravan\WEB-INF\server.xml
everything is fine....program is compiled ...but when iam running the servlet in tomcat iam getting error 404 Login.html not found....
so plz kindly help me this my first servlet .....

There seems not to be any '.html' in your url-pattern
<url-pattern>Login</url-pattern>- so i presume you should use
http://yourhost/Logininstead.

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