java实现判断ip是否在指定ip区间的工具类

思路：

利用ip和ip区间两端的值调用ipIsValid方法。

（视频教程推荐：java课程）

工具类：

import org.apache.commons.lang.StringUtils; import org.springframework.web.context.request.RequestContextHolder; import org.springframework.web.context.request.ServletRequestAttributes;  import javax.servlet.http.HttpServletRequest;   public class IPUtil {  	/**      * 获得当前ip      * @return      */     public static String getIP(){         ServletRequestAttributes servletRequestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();         if(servletRequestAttributes == null) {             return "127.0.0.1";         }          HttpServletRequest request = servletRequestAttributes.getRequest();         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.getHeader("HTTP_CLIENT_IP");         }         if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {             ip = request.getHeader("HTTP_X_FORWARDED_FOR");         }         if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {             ip = request.getRemoteAddr();         }         if ("0:0:0:0:0:0:0:1".equals(ip)) {             ip = "127.0.0.1";         }         return ip;     }      /**      * 判断IP是否在指定范围      * @param ipStart      * @param ipEnd      * @param ip      * @return      */     public static boolean ipIsValid(String ipStart,String ipEnd, String ip) {         if (StringUtils.isEmpty(ipStart)) {             throw new NullPointerException("起始IP不能为空！");         }         if (StringUtils.isEmpty(ipEnd)) {             throw new NullPointerException("结束IP不能为空！");         }         if (StringUtils.isEmpty(ip)) {             throw new NullPointerException("IP不能为空！");         }         ipStart = ipStart.trim();         ipEnd = ipEnd.trim();         ip = ip.trim();         final String REGX_IP = "((25[0-5]|2[0-4]\\d|1\\d{2}|[1-9]\\d|\\d)\\.){3}(25[0-5]|2[0-4]\\d|1\\d{2}|[1-9]\\d|\\d)";         final String REGX_IPB = REGX_IP + "\\-" + REGX_IP;         if (!ipStart.matches(REGX_IP) || !ip.matches(REGX_IP) || !ipEnd.matches(REGX_IP)) {             return false;         }         String[] sips = ipStart.split("\\.");         String[] sipe = ipEnd.split("\\.");         String[] sipt = ip.split("\\.");         long ips = 0L, ipe = 0L, ipt = 0L;         for (int i = 0; i < 4; ++i) {             ips = ips << 8 | Integer.parseInt(sips[i]);             ipe = ipe << 8 | Integer.parseInt(sipe[i]);             ipt = ipt << 8 | Integer.parseInt(sipt[i]);         }         if (ips > ipe) {             long t = ips;             ips = ipe;             ipe = t;         }         return ips <= ipt && ipt <= ipe;     }   }

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