Restrict User IP : Security « Servlets « Java

Restrict User IP


import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class RestrictUserIP extends HttpServlet {
  public void doGet(HttpServletRequest req, HttpServletResponse resp)
      throws ServletException, IOException {
    PrintWriter out;
    /**
     * Status code (401) indicating that the request requires HTTP
     * authentication.
     */
    if (req.getRemoteAddr().equals("142.3.28.87")) {
      resp.sendError(HttpServletResponse.SC_UNAUTHORIZED);
    }
    resp.setContentType("text/html");
    out = resp.getWriter();
    out.println("<HTML>");
    out.println("<BODY>");
    out.println("<H1>");
    out.println("Hello!");
    out.println("<BR>");
    out.println("Your IP Address: " + req.getRemoteAddr());
    out.println("</H1>");
    out.println("</body>");
    out.println("</html>");
    out.close();
  }
}

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