Get client ip, using java

gistfile1.java

    public 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;      
      }