本文為joshua317原創文章,轉載請註明：轉載自joshua317部落格https://www.joshua317.com/article/218

Java InetAddress類的方法

這個類表示網際網路協議(IP)地址。下面列出了 InetAddress 類常用的方法：

package com.joshua317;

import java.net.InetAddress;
import java.net.UnknownHostException;

public class Main {
    public static void main(String[] args){
        InetAddressTest inetAddress = new InetAddressTest();
        try {
            //根據域名獲取
            InetAddress address1 = inetAddress.getInetAddress("www.baidu.com");
            System.out.println(address1);
            System.out.println(address1.getHostName() + "--" +address1.getHostAddress());

            //根據ip獲取
            InetAddress address2 = inetAddress.getInetAddressByIp("103.235.46.39");
            System.out.println(address2);
            System.out.println(address2.getHostName() + "--" +address2.getHostAddress());

            //根據byte型別獲取
            byte[] bytes = {103,34,46,39};
            InetAddress address3 = inetAddress.getInetAddress(bytes);
            System.out.println(address3);

            //如果數值超出Byte最大範圍，需要進行轉換，例如：(byte)(235 &0xff)
            System.out.println("Byte最小值:" + Byte.MIN_VALUE);
            System.out.println("Byte最大值:" + Byte.MAX_VALUE);
            byte[] bytes2 = {103,(byte)(235 &0xff),46,39};
            InetAddress address4 = inetAddress.getInetAddress(bytes2);
            System.out.println(address4);

            //檢視是否是迴環地址
            InetAddress address5 = inetAddress.getInetAddressByIp("127.0.0.1");
            System.out.println(address5.isLoopbackAddress());
            //檢視是否是本地地址
            System.out.println(address5.isLinkLocalAddress());

        } catch (UnknownHostException e) {
            e.printStackTrace();
        }
    }
}
@SuppressWarnings("all")
class InetAddressTest {

    public InetAddressTest() {
    }

    public InetAddress getInetAddress(String host) throws UnknownHostException{
        return InetAddress.getByName(host);
    }
    public InetAddress getInetAddress(byte[] host) throws UnknownHostException{
        return InetAddress.getByAddress(host);
    }

    public InetAddress getInetAddress(String host,byte[] ipByte) throws UnknownHostException{
        return InetAddress.getByAddress(host, ipByte);
    }
    public InetAddress getInetAddressByIp(String ip) throws UnknownHostException{
        String[] ipStr = ip.split("\\.");
        byte[] ipByte = new byte[4];
        for (int i =0; i<ipByte.length; i++) {
            ipByte[i] = (byte) (Integer.parseInt(ipStr[i]) &0xff);
        }
        return InetAddress.getByAddress(ipByte);
    }
}
 

本文為joshua317原創文章,轉載請註明：轉載自joshua317部落格https://www.joshua317.com/article/218