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Java InetAddress类的方法

地址 IP
2023-04-18 16:17:31 时间

本文为joshua317原创文章,转载请注明：转载自joshua317博客 https://www.joshua317.com/article/218

Java InetAddress类的方法

这个类表示互联网协议(IP)地址。下面列出了 InetAddress 类常用的方法：

序号

方法描述

1

static InetAddress getByAddress(byte[] addr) 在给定原始 IP 地址的情况下，返回 InetAddress 对象。

2

static InetAddress getByAddress(String host, byte[] addr) 根据提供的主机名和 IP 地址创建 InetAddress。

3

static InetAddress getByName(String host) 在给定主机名的情况下确定主机的 IP 地址。

4

String getHostAddress() 返回 IP 地址字符串（以文本表现形式）。

5

String getHostName() 获取此 IP 地址的主机名。

6

static InetAddress getLocalHost() 返回本地主机。

7

String toString() 将此 IP 地址转换为 String。

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 {
            //根据域名获取
            InetAddress address1 = inetAddress.getInetAddress("www.baidu.com");
            System.out.println(address1);
            System.out.println(address1.getHostName() + "--" +address1.getHostAddress());

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

            //根据byte类型获取
            byte[] bytes = {103,34,46,39};
            InetAddress address3 = inetAddress.getInetAddress(bytes);
            System.out.println(address3);

            //如果数值超出Byte最大范围，需要进行转换，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);

            //查看是否是回环地址
            InetAddress address5 = inetAddress.getInetAddressByIp("127.0.0.1");
            System.out.println(address5.isLoopbackAddress());
            //查看是否是本地地址
            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);
    }
}

本文为joshua317原创文章,转载请注明：转载自joshua317博客 https://www.joshua317.com/article/218

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