怎么获得客户端的IP及MAC地址

1、获得真实的IP地址

public static String getIpAddr(HttpServletRequest request) {
  String ip = request.getHeader("x-forwarded-for");
  if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
   ip = request.getHeader("Proxy-Client-IP");
  }
  if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
   ip = request.getHeader("WL-Proxy-Client-IP");
  }
  if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
   ip = request.getRemoteAddr();
  }
  return ip;
 }

2、下面两个方法，是获得MAC地址。

public static String callCmd(String[] cmd) {  
        StringBuilder result = new StringBuilder("");  
        String line = "";  
        try {
         Process proc=null;
         for(String tmp:cmd){         
          proc = Runtime.getRuntime().exec(tmp);   
          proc.waitFor();
         }
         BufferedInputStream in = new BufferedInputStream(proc.getInputStream());
            BufferedReader br = new BufferedReader(new InputStreamReader(in));
            String s;
            while ((s = br.readLine()) != null)
             result.append(s).append("\n");
        } catch (Exception e) {
         e.printStackTrace();
        }

        return result.toString();  
    }  

public static String filterMacAddress(String ip, String sourceString,String macSeparator) {  
      String result = "";  
         String regExp = "((([0-9,A-F,a-f]{1,2}" + macSeparator + "){1,5})[0-9,A-F,a-f]{1,2})";  
         Pattern pattern = Pattern.compile(regExp);  
         Matcher matcher = pattern.matcher(sourceString);  
         while(matcher.find()){  
             result = matcher.group(1);  
             if(sourceString.indexOf(ip) <= sourceString.lastIndexOf(matcher.group(1))) {  
                 break;  //如果有多个IP,只匹配本IP对应的Mac.  
             }  
         }   
         return result;  
     }  

 public static void main(String[] args) {
  String ip ="10.81.66.155";
  String aa= filterMacAddress(ip,callCmd(new String[]{"ping "+ip,"arp "+ip+" -a"}),"-");
  System.out.println(aa);
 }