
Java实现获取本机Ip的工具类
获取本机Ip算是比较常见的一个需求场景了,比如业务报警,可能就会带上出问题的机器IP,方便直接上去看日志定位问题,那么问题来了,如何获取机器IP呢?
I. IpUtil工具类
1. 基本方法
如何获取机器Ip?如果了解InetAddress这个工具类,就很容易写出一个简单的工具类,如下
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   | public static String getLocalIP() {     try {         return InetAddress.getLocalHost().getHostAddress();     } catch (UnknownHostException e) {         throw new RuntimeException(e);     } }
  | 
 
上面的实现有问题么?
当然没问题,拿我本机和阿里服务器执行一下,并没有问题如实的输出了预期的IP
本机执行后截图如下:

阿里云机器执行后截图如下:

再问一句,那是否就真的没有问题了呢?
在虚拟机中执行时,就可能遇到这个问题,截图如下

2. 进阶版
做一点简单的改动,获取IpV4的地址,源码如下
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   | 
 
 
 
  public static String getLocalIpByNetcard() {     try {         for (Enumeration<NetworkInterface> e = NetworkInterface.getNetworkInterfaces(); e.hasMoreElements(); ) {             NetworkInterface item = e.nextElement();             for (InterfaceAddress address : item.getInterfaceAddresses()) {                 if (item.isLoopback() || !item.isUp()) {                     continue;                 }                 if (address.getAddress() instanceof Inet4Address) {                     Inet4Address inet4Address = (Inet4Address) address.getAddress();                     return inet4Address.getHostAddress();                 }             }         }         return InetAddress.getLocalHost().getHostAddress();     } catch (SocketException | UnknownHostException e) {         throw new RuntimeException(e);     } }
 
  | 
 
再次测试,输出如下

3. 完整工具类
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   | import java.net.*; import java.util.Enumeration;
  public class IpUtil {     public static final String DEFAULT_IP = "127.0.0.1";
      
 
 
 
      public static String getLocalIpByNetcard() {         try {             for (Enumeration<NetworkInterface> e = NetworkInterface.getNetworkInterfaces(); e.hasMoreElements(); ) {                 NetworkInterface item = e.nextElement();                 for (InterfaceAddress address : item.getInterfaceAddresses()) {                     if (item.isLoopback() || !item.isUp()) {                         continue;                     }                     if (address.getAddress() instanceof Inet4Address) {                         Inet4Address inet4Address = (Inet4Address) address.getAddress();                         return inet4Address.getHostAddress();                     }                 }             }             return InetAddress.getLocalHost().getHostAddress();         } catch (SocketException | UnknownHostException e) {             throw new RuntimeException(e);         }     }
      public static String getLocalIP() {         try {             return InetAddress.getLocalHost().getHostAddress();         } catch (UnknownHostException e) {             throw new RuntimeException(e);         }     } }
   | 
 
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