如何在 Java 中查找本地主机的 IP 地址
Java 网络 API 提供了一种使用 java.net 从 Java 程序中查找本地主机 IP 地址的方法。 InetAddress
类。 在 Java 程序中很少需要本地主机的 IP 地址。 大多数情况下,我使用 Unix 命令来查找本地主机的 IP 地址。 对于程序不需要 IP 地址但我们需要解决任何网络问题的所有实际用途,请使用 DOS 或 Windows 命令或使用 Linux 命令。 最近我的一个朋友在核心 Java 面试中遇到了这个问题,他们期望 Java 开发人员具有一些套接字编程经验,但是直到你知道或者你已经完成之前很难回答这个基于事实的问题,这促使我们去写这篇文章。
在本 Java 教程中,我们将看到如何从 Java 程序中查找本地主机的 IP 地址。 顺便说一句,最好记住 Unix 网络命令列表,以解决 Unix 环境中与 Java 应用程序相关的任何网络问题。
来自 Java 程序的本地主机的 IP 地址
正如我所说,java.net 包中的 InetAddress
用于表示 Java 中的 IP 地址。 IP 地址是 32 位或 128 位的无符号数字,由 IP 协议使用,该协议是许多流行协议(如 TCP 和 UDP)的主干。
IP 地址有 IPv4 和 IPv6 两种,IP 地址与主机相关联,可以通过主机名解析过程找到主机。
主机名解析是通过结合本地机器配置和网络命名服务(例如 DNS(域名系统)和 NIS(网络信息服务))来执行的。 InetAddress
有一个方法来解析主机名和 IP 地址,反之亦然。 这是从 Java 程序中查找 IP 地址的完整代码示例。
import java.net.UnknownHostException;
/**
* 用于查找本地主机 IP 地址的简单 Java 程序。 这个程序使用
* InetAddress 从 java.net 包中查找 IP 地址。
*
*/
public class IPTest {
public static void main(String args[]) throws UnknownHostException {
InetAddress addr = InetAddress.getLocalHost();
// 获取本地主机的 IP 地址 - getHostAddress 以文本格式返回 IP 地址
String ipAddress = addr.getHostAddress();
System.out.println("IP address of localhost from Java Program: " + ipAddress);
//Hostname
String hostname = addr.getHostName();
System.out.println("Name of hostname : " + hostname);
}
}
上述代码输出结果如下
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