Java tutorial
//package com.java2s; /* * Copyright (C) 2013 www.418log.org * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ public class Main { public static long ip2int(String ip) { ip = ip.replace(".", ","); String[] items = ip.split(","); return Long.valueOf(items[0]) << 24 | Long.valueOf(items[1]) << 16 | Long.valueOf(items[2]) << 8 | Long.valueOf(items[3]); } }