how to change log levels of 3rd party library in java

问题

The console logs is cluttered with logs from 3rd part libraries. For example my project uses kafka and zooker keeper client libraries because of this there are too many logs from them

1. 2018-05-08 10:30:38.250 INFO 2968 --- [0:0:0:0:1:2181)] org.apache.zookeeper.ClientCnxn : Opening socket connection to server 0:0:0:0:0:0:0:1/0:0:0:0:0:0:0:1:2181. Will not attempt to authenticate using SASL (unknown error)

2. 2018-05-08 10:30:38.309 INFO 2968 --- [ main] o.a.k.clients.producer.ProducerConfig : ProducerConfig values:

   there is a log4j2.xml file in my project. Changing root log level in xml file only changes log level of the custom logs generated by my project. Is there a way to stop or changes logs of these libraries

回答1:

Switch to Logback and change the logging level for flooding logger. Usually, it names after its class reference.

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
 <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
    <encoder>
        <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
    </encoder>
 </appender>
 <logger name="flooding logger" level="ERROR" additivity="false">
    <appender-ref ref="STDOUT"/>
 </logger>
 <root level="INFO">
    <appender-ref ref="STDOUT"/>
 </root>
</configuration>

来源：https://stackoverflow.com/questions/50226224/how-to-change-log-levels-of-3rd-party-library-in-java