通过request取IP

转自：
http://blog.sina.com.cn/s/blog_7fa2bcf50100x8ql.html

根据request获取IP的方式:
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;
    }
注意:当访问地址为localhost时 地址格式为 0:0:0:0:0:0:1
访问地址写为127.0.0.1时正常