具体网络知识原理请看这个博文

    /**** @param address servletRequest.getRemoteAddr();* @param host servletRequest.getRemoteHost();* @return* Description 检验IP是否符合安全限定*/private  boolean ipIsInNet(String address, String host){Set<String> iPset = allowedIP.setAllowedIPValues().getAllowedIP();if(iPset.contains(address) || iPset.contains(host)){return true;}String[] ipItems = host.split("\\.");if(ipItems.length!=4) return false;for(String addr:iPset){if(addr.indexOf("/")<0) continue;long ipAddress = (Long.parseLong(ipItems[0])<<24)|(Long.parseLong(ipItems[1])<<16)|(Long.parseLong(ipItems[2])<<8)|Long.parseLong(ipItems[3]);int type = Integer.parseInt(addr.replaceAll(".*/", ""));long mask = 0xFFFFFFFF << (32 - type);String cidrIp = addr.replaceAll("/.*", "");String[] ipChildItems = cidrIp.split("\\.");long childIpAddress = (Long.parseLong(ipChildItems[0])<<24)|(Long.parseLong(ipChildItems[1])<<16)|(Long.parseLong(ipChildItems[2])<<8)|Long.parseLong(ipChildItems[3]);if((ipAddress & mask)==(childIpAddress & mask)) return true;}return false;}