Java获取客户端真实IP地址

 1 public String getIpAddr(HttpServletRequest request) {
 2        String ip = request.getHeader("x-forwarded-for");
 3        if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
 4            ip = request.getHeader("Proxy-Client-IP");
 5        }
 6        if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
 7            ip = request.getHeader("WL-Proxy-Client-IP");
 8        }
 9        if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
10            ip = request.getRemoteAddr();
11        }
12        return ip;
13    }