验证IP地址（带掩码）

首先，您需要将IP地址转换为flat

int

String       s = "10.1.1.99";Inet4Address a = (Inet4Address) InetAddress.getByName(s);byte[]       b = a.getAddress();int          i = ((b[0] & 0xFF) << 24) |      ((b[1] & 0xFF) << 16) |      ((b[2] & 0xFF) << 8)  |      ((b[3] & 0xFF) << 0);

一旦您的IP地址为

int

int subnet = 0x0A010100;   // 10.1.1.0/24int bits   = 24;int ip     = 0x0A010199;   // 10.1.1.99// Create bitmask to clear out irrelevant bits. For 10.1.1.0/24 this is// 0xFFFFFF00 -- the first 24 bits are 1's, the last 8 are 0's.////     -1        == 0xFFFFFFFF//     32 - bits == 8//     -1 << 8   == 0xFFFFFF00mask = -1 << (32 - bits)if ((subnet & mask) == (ip & mask)) {    // IP address is in the subnet.}