java常用方法5

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//判断某一个IP是否为内网IP public static boolean isInnerIP(String ipAddress) { boolean isInnerIp = false; long ipNum = getIpNum(ipAddress); /** * 私有IP:A类 10.0.0.0-10.255.255.255 B类 172.16.0.0-172.31.255.255 C类 * 192.168.0.0-192.168.255.255 当然,还有127这个网段是环回地址 */ long aBegin = getIpNum("10.0.0.0"); long aEnd = getIpNum("10.255.255.255"); long bBegin = getIpNum("172.16.0.0"); long bEnd = getIpNum("172.31.255.255"); long cBegin = getIpNum("192.168.0.0"); long cEnd = getIpNum("192.168.255.255"); isInnerIp = isInner(ipNum, aBegin, aEnd) || isInner(ipNum, bBegin, bEnd) || isInner(ipNum, cBegin, cEnd) || ipAddress.equals("127.0.0.1"); return isInnerIp; } //把ip地址转换为数字 public static long getIpNum(String ipAddress) { String[] ip = split(ipAddress, "."); long a = Integer.parseInt(ip[0]); long b = Integer.parseInt(ip[1]); long c = Integer.parseInt(ip[2]); long d = Integer.parseInt(ip[3]); long ipNum = a * 256 * 256 * 256 + b * 256 * 256 + c * 256 + d; return ipNum; } /** * 判断指定IP是否在某一IP段内 * @param userIp 指定IP * @param begin 开始IP * @param end 结束IP * @return 如果为true则在指定IP段内,否则返回false */ public static boolean isInner(long userIp, long begin, long end) { return (userIp >= begin) && (userIp <= end); } /** * 分割字符串,原理:检测字符串中的分割字符串,然后取子串 * @param original 需要分割的字符串 * @paran regex 分割字符串 * @return 分割后生成的字符串数组 * 例; * split(String original,String "$%") * 注意,后面的参数是表示分隔符,且"$%"表示的是$和%都可以是分隔符,并不是两者一起才是分隔符 */ public static String[] split(String original, String regex) { StringTokenizer st = new StringTokenizer(original, regex); ArrayList al = new ArrayList(); while (st.hasMoreTokens()) { al.add(st.nextToken()); } String[] result = new String[al.size()]; return (String[]) al.toArray(result); }
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