|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
在这个案例里，动态修改应用的Logger Level。
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
### 查找UserController的ClassLoader
|
|
|
|
|
|
|
|
|
|
|
|
`sc -d com.example.demo.arthas.user.UserController | grep classLoaderHash`{{execute T2}}
|
|
|
|
|
|
|
|
|
|
|
|
```bash
|
|
|
|
|
|
$ sc -d com.example.demo.arthas.user.UserController | grep classLoaderHash
|
|
|
|
|
|
classLoaderHash 1be6f5c3
|
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
|
|
### 用ognl获取logger
|
|
|
|
|
|
|
|
|
|
|
|
`ognl --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader '@com.example.demo.arthas.user.UserController@logger'`{{execute T2}}
|
|
|
|
|
|
|
|
|
|
|
|
```bash
|
|
|
|
|
|
$ ognl --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader '@com.example.demo.arthas.user.UserController@logger'
|
|
|
|
|
|
@Logger[
|
|
|
|
|
|
serialVersionUID=@Long[5454405123156820674],
|
|
|
|
|
|
FQCN=@String[ch.qos.logback.classic.Logger],
|
|
|
|
|
|
name=@String[com.example.demo.arthas.user.UserController],
|
|
|
|
|
|
level=null,
|
|
|
|
|
|
effectiveLevelInt=@Integer[20000],
|
|
|
|
|
|
parent=@Logger[Logger[com.example.demo.arthas.user]],
|
|
|
|
|
|
childrenList=null,
|
|
|
|
|
|
aai=null,
|
|
|
|
|
|
additive=@Boolean[true],
|
|
|
|
|
|
loggerContext=@LoggerContext[ch.qos.logback.classic.LoggerContext[default]],
|
|
|
|
|
|
]
|
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
|
|
可以知道`UserController@logger`实际使用的是logback。可以看到`level=null`，则说明实际最终的level是从`root` logger里来的。
|
|
|
|
|
|
|
|
|
|
|
|
### 单独设置UserController的logger level
|
|
|
|
|
|
|
|
|
|
|
|
`ognl --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader '@com.example.demo.arthas.user.UserController@logger.setLevel(@ch.qos.logback.classic.Level@DEBUG)'`{{execute T2}}
|
|
|
|
|
|
|
|
|
|
|
|
再次获取`UserController@logger`，可以发现已经是`DEBUG`了：
|
|
|
|
|
|
|
|
|
|
|
|
`ognl --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader '@com.example.demo.arthas.user.UserController@logger'`{{execute T2}}
|
|
|
|
|
|
|
|
|
|
|
|
```bash
|
|
|
|
|
|
$ ognl --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader '@com.example.demo.arthas.user.UserController@logger'
|
|
|
|
|
|
@Logger[
|
|
|
|
|
|
serialVersionUID=@Long[5454405123156820674],
|
|
|
|
|
|
FQCN=@String[ch.qos.logback.classic.Logger],
|
|
|
|
|
|
name=@String[com.example.demo.arthas.user.UserController],
|
|
|
|
|
|
level=@Level[DEBUG],
|
|
|
|
|
|
effectiveLevelInt=@Integer[10000],
|
|
|
|
|
|
parent=@Logger[Logger[com.example.demo.arthas.user]],
|
|
|
|
|
|
childrenList=null,
|
|
|
|
|
|
aai=null,
|
|
|
|
|
|
additive=@Boolean[true],
|
|
|
|
|
|
loggerContext=@LoggerContext[ch.qos.logback.classic.LoggerContext[default]],
|
|
|
|
|
|
]
|
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
|
|
### 修改logback的全局logger level
|
|
|
|
|
|
|
|
|
|
|
|
通过获取`root` logger，可以修改全局的logger level：
|
|
|
|
|
|
|
|
|
|
|
|
`ognl --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader '@org.slf4j.LoggerFactory@getLogger("root").setLevel(@ch.qos.logback.classic.Level@DEBUG)'`{{execute T2}}
|
|
|
|
|
|
|
