log4j2输出带有ip日志，便于集群环境查找

1.设置环境变量

Java代码

/设置系统环境变量  
System.setProperty("local-ip", "10.99.1.51");  
//获取系统环境变量  
System.out.println(System.getProperty("local-ip"));  
   
try {  
//设置本机地址到环境变量  
    System.setProperty("local-ip", LocalIP.getIpAddress().getHostAddress());  
} catch (SocketException e) {  
    e.printStackTrace();  
}  

2.log4j2.xml配置获取环境变量

Xml代码

<Property name="logFormat">  
    [${sys:local-ip}] [%thread] %-5level %logger{35} - %msg %n  
</Property>  
<Property name="log-local-ip">  
    ${sys:local-ip}  
</Property>  

3.java获取本地ip过滤掉还回和虚拟网卡地址

Java代码

import java.net.InetAddress;  
import java.net.NetworkInterface;  
import java.net.SocketException;  
import java.util.Enumeration;  
   
public class LocalIP {  
   
    public static void main(String[] args) throws SocketException {  
        System.out.println(getIpAddress().getHostAddress());  
   
    }  
   
    public static InetAddress getIpAddress() throws SocketException {  
        Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();  
        while (interfaces.hasMoreElements()) {  
            NetworkInterface current = interfaces.nextElement();  
            if (!current.isUp() || current.isLoopback() || current.isVirtual())  
                continue;  
            Enumeration<InetAddress> addresses = current.getInetAddresses();  
            while (addresses.hasMoreElements()) {  
                InetAddress addr = addresses.nextElement();  
                if (addr.isLoopbackAddress())  
                    continue;  
                if (addr.isSiteLocalAddress()) {//去掉还回和虚拟地址  
                    return addr;  
                }  
//              System.out.println(addr.isSiteLocalAddress());  
//              System.out.println(addr);  
            }  
        }  
   
        throw new SocketException("Can't get our ip address, interfaces are: " + interfaces);  
    }  
   
}  