Get Remote User and display welcome message : Request « Servlet « Java Tutorial

1. Java Tutorial
2. Servlet
3. Request

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;

public class MyServlet extends HttpServlet {

  Hashtable accesses = new Hashtable();

  public void doGet(HttpServletRequest req, HttpServletResponse res)
                               throws ServletException, IOException {
    res.setContentType("text/html");
    PrintWriter out = res.getWriter();

    String remoteUser = req.getRemoteUser();

    if (remoteUser == null) {
      out.println("Welcome!");
    }
    else {
      out.println("Welcome, " + remoteUser + "!");
      Date lastAccess = (Date) accesses.get(remoteUser);
      if (lastAccess == null) {
        out.println("This is your first visit!");
      }
      else {
        out.println("Your last visit was " + accesses.get(remoteUser));
      }

      if (remoteUser.equals("YourFirendName")) {
        out.println("Shall we play a game?");
      }

      accesses.put(remoteUser, new Date());
    }
  }
}

<?xml version="1.0" encoding="ISO-8859-1"?>

<!DOCTYPE web-app
    PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"
    "http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">

<web-app>
    <servlet><servlet-name>MyServletName</servlet-name>
             <servlet-class>MyServlet</servlet-class>

             
    </servlet>
    
    <servlet-mapping><servlet-name>MyServletName</servlet-name>
        <url-pattern>/index.html</url-pattern>
    </servlet-mapping>
</web-app>

25.12.Request
	25.12.1.	Print Request Headers for a Servlet
	25.12.2.	Get Servlet Request Parameter
	25.12.3.	Get Remote User and display welcome message
	25.12.4.	Get Users IP Address
	25.12.5.	Get Remote Host from Servlet Request
	25.12.6.	Request parsing and encoding utility methods