java判断IP是否在某个网段中

Java判断IP是否在指定网段中，看代码
/**
* 判断ip是否在指定网段中
* @author dh
* @param iparea
* @param ip
* @return boolean
*/
public static boolean ipIsInNet(String iparea, String ip) {
if (iparea == null)
throw new NullPointerException("IP段不能为空！");
if (ip == null)
throw new NullPointerException("IP不能为空！");
iparea = iparea.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 (!iparea.matches(REGX_IPB) || !ip.matches(REGX_IP))
return false;
int idx = iparea.indexOf('-');
String[] sips = iparea.substring(0, idx).split("\\.");
String[] sipe = iparea.substring(idx + 1).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;
}

OK，祝君好运！