package com.babyDuncan.java;  import java.io.IOException;  import java.io.InputStreamReader;  import java.io.LineNumberReader;  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 ipServlet extends HttpServlet {        public void doGet(HttpServletRequest request, HttpServletResponse response)              throws ServletException, IOException {          doPost(request, response);      }        public void doPost(HttpServletRequest request, HttpServletResponse response)              throws ServletException, IOException {            String ip = getRemoteAddress(request);          System.out.println(ip);          System.out.println(getMACAddress(ip));            response.setContentType("text/html");          PrintWriter out = response.getWriter();          out.println("");          out.println("");          out.println("  ");          out.println("  ");          out.print("    This is ");          out.print(this.getClass());          out.println(", using the POST method");          out.println("  ");          out.println("");          out.flush();          out.close();      }        public String getRemoteAddress(HttpServletRequest request) {          String ip = request.getHeader("x-forwarded-for");          if (ip == null || ip.length() == 0 || ip.equalsIgnoreCase("unknown")) {              ip = request.getHeader("Proxy-Client-IP");          }          if (ip == null || ip.length() == 0 || ip.equalsIgnoreCase("unknown")) {              ip = request.getHeader("WL-Proxy-Client-IP");          }          if (ip == null || ip.length() == 0 || ip.equalsIgnoreCase("unknown")) {              ip = request.getRemoteAddr();          }          return ip;      }        public String getMACAddress(String ip) {          String str = "";          String macAddress = "";          try {              Process p = Runtime.getRuntime().exec("nbtstat -A " + ip);              InputStreamReader ir = new InputStreamReader(p.getInputStream());              LineNumberReader input = new LineNumberReader(ir);              for (int i = 1; i < 100; i++) {                  str = input.readLine();                  if (str != null) {                      if (str.indexOf("MAC Address") > 1) {                          macAddress = str.substring(                                  str.indexOf("MAC Address") + 14, str.length());                          break;                      }                  }              }          } catch (IOException e) {              e.printStackTrace(System.out);          }          return macAddress;      }  }