IP转化

IP相互转化

 

/*
  * >>>无符号右移
  * >>右移
  * <<左移
  * */
 public String longToIP(long longIP) {
  StringBuilder sb = new StringBuilder("");
  sb.append(String.valueOf(longIP >>> 24));
  sb.append(".");
  sb.append(String.valueOf((longIP & 0x00FFFFFF) >>> 16));
  sb.append(".");
  sb.append(String.valueOf((longIP & 0x0000FFFF) >>> 8));
  sb.append(".");
  sb.append(String.valueOf(longIP & 0x000000FF));
  return sb.toString();
 }

 public long IPToLong(String strIP) {
  String[] ipArr = strIP.split("\\.");
  return (Long.parseLong(ipArr[0]) << 24)
    + (Long.parseLong(ipArr[1]) << 16)
    + (Long.parseLong(ipArr[2]) << 8) + Long.parseLong(ipArr[3]);
 }