阿里的开源Java诊断工具Arthas可以在线调整log等级
1. 查找当前类的classloader hashcode
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sc -d com.example.demo.arthas.user.UserController | grep classLoaderHash
2. 用OGNL获取logger
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ognl -c 1be6f5c3 '@com.example.demo.arthas.user.UserController@logger'
3. 单独设置UserController的logger level
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ognl -c 1be6f5c3 '@c
