检测IP输入是否合法

/** * 檢測IP輸入是否合法 * @param ip * @return */ private boolean checkIp(String ip) { StringTokenizer st = new StringTokenizer(ip,"."); int count = st.countTokens(); if (count != 4) return false; for (int i = 0; i < 4; i++) { int ipInt = Integer.parseInt(st.nextToken()); if (ipInt >= 0 && ipInt <= 255) continue; else return false; } return true; }