IP地址转换工具类
public class IPUtil { /** * 将IP地址(61.172.201.235)转变成Long，如果ip格式非法，那么返回0 * * @param ip * @return */ public static long ip2Long(String ip) { if (!isIP(ip)) { return 0; } long iplong = 0; String[] segs = StringUtil.split(ip, "."); for (int i = 0; i < segs.length; i++) { long seg = Long.parseLong(segs[i]); iplong += seg << ((3 - i) * 8); } return iplong; } /** * 将数据库中表示IP的Long型，转变成标准形式（61.172.201.235） * * @param ipLong * @return */ public static String long2IP(long ipLong) { StringBuffer ip = new StringBuffer(String.valueOf(ipLong >> 24) + "."); ip.append(String.valueOf((ipLong & 16711680) >> 16) + "."); ip.append(String.valueOf((ipLong & 65280) >> 8) + "."); ip.append(String.valueOf(ipLong & 255)); return ip.toString(); } /** * 判断字符是否是一个表示IP的字符 * * @param str * @return */ public static boolean isIP(String str) { String[] tokens = StringUtil.split(str, "."); if (tokens.length != 4) { return false; } for (int i = 0; i < tokens.length; i++) { if (Integer.parseInt(tokens[i]) > 255 || Integer.parseInt(tokens[i]) < 0) { return false; } } return true; }}用bShare分享或收藏本文?