logback 添加自定义字段(转换)

<configuration scan="true"> 
    <conversionRule conversionWord="serverIP" 
        converterClass="com.foo.MyCustomTagConverter" /> 

    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender"> 
    <!-- encoders are by default assigned the type 
     ch.qos.logback.classic.encoder.PatternLayoutEncoder --> 
    <encoder> 
     <pattern>%serverIP- %m%n</pattern> 
    </encoder> 
    </appender> 

... 

</configuration> 

import ch.qos.logback.classic.pattern.ClassicConverter;
import ch.qos.logback.classic.spi.ILoggingEvent;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.net.InetAddress;
import java.net.UnknownHostException;
public class LogIpConfig extends ClassicConverter {
    private static final Logger logger = LoggerFactory.getLogger(LogIpConfig .class);
    private static String webIP;
    static {
        try {
            webIP = InetAddress.getLocalHost().getHostAddress();
        } catch (UnknownHostException e) {
            logger.error("获取日志Ip异常", e);
            webIP = null;
        }
    }

    @Override
    public String convert(ILoggingEvent event) {
        return webIP;
    }
}