java获取客户端IP地址

1. public String getIpAddr() {   
2. HttpServletRequest request= this.getRequest();  
3.  String ip = request.getHeader("x-forwarded-for");  
4.  if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip))  
5.  { ip = request.getHeader("Proxy-Client-IP"); }   
6.  if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip))   
7.  { ip = request.getHeader("WL-Proxy-Client-IP"); }   
8.  if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip))   
9.  { ip = request.getRemoteAddr(); } return ip; }