studio.raptor.ddal.common.util.IpUtil Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
package studio.raptor.ddal.common.util;
import java.net.InetAddress;
import java.net.UnknownHostException;
/**
* ip conversion
*
* @author jackcao, sam
*/
public class IpUtil {
/**
* 将127.0.0.1形式的IP地址转换成指定长度的十进制整数（10位）ip不能为0.0.0.0和1.1.1.1
*
* @param strIp 字符串形式的IP地址，例如"127.0.0.1"
* @return IP地址的十进制整数
*/
public static long ipToLong(String strIp) {
long[] ip = new long[4];
// 先找到IP地址字符串中.的位置
int position1 = strIp.indexOf(".");
int position2 = strIp.indexOf(".", position1 + 1);
int position3 = strIp.indexOf(".", position2 + 1);
// 将每个.之间的字符串转换成整型
ip[0] = Long.parseLong(strIp.substring(0, position1));
ip[1] = Long.parseLong(strIp.substring(position1 + 1, position2));
ip[2] = Long.parseLong(strIp.substring(position2 + 1, position3));
ip[3] = Long.parseLong(strIp.substring(position3 + 1));
return (ip[0] << 24) + (ip[1] << 16) + (ip[2] << 8) + ip[3];
}
/**
* 将十进制整数形式转换成127.0.0.1形式的ip地址。
*
* Compiler will change this kind of string-plus style code to
* {@link StringBuilder#append(String)}, so we don't need to write StringBuilder
* in our code.
*
* The easiest way to see the compiled code is compile java code to smali-code.
*
* @param longIp 十进制整数
* @return 字符串形式的IP地址。
*/
public static String longToIP(long longIp) {
String appender = "";
// 直接右移24位
appender += String.valueOf((longIp >>> 24));
appender += ".";
// 将高8位置0，然后右移16位
appender += String.valueOf((longIp & 0x00FFFFFF) >>> 16);
appender += ".";
// 将高16位置0，然后右移8位
appender += String.valueOf((longIp & 0x0000FFFF) >>> 8);
appender += ".";
// 将高24位置0
appender += String.valueOf((longIp & 0x000000FF));
return appender;
}
/**
* 根据名称获取对应的物理IP
*
* @param hostName host name
* @return an IP address for the given host name.
* @throws UnknownHostException throw an exception if the given host name can't be verified.
*/
public static String physicalIp(String hostName) throws UnknownHostException {
return InetAddress.getByName(hostName).getHostAddress();
}
}