获取系统的一些信息汇总

1、获取IP地址

    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;
       }