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< h1 > logger< a class = "headerlink" href = "#logger" title = "永久链接至标题" > ¶< / a > < / h1 >
< blockquote >
< div > < p > 查看logger信息， < / p >
< / div > < / blockquote >
< div class = "section" id = "id1" >
< h2 > 使用参考< a class = "headerlink" href = "#id1" title = "永久链接至标题" > ¶< / a > < / h2 >
< div class = "section" id = "id2" >
< h3 > 查看所有logger信息< a class = "headerlink" href = "#id2" title = "永久链接至标题" > ¶< / a > < / h3 >
< p > 以下面的< code class = "docutils literal notranslate" > < span class = "pre" > logback.xml< / span > < / code > 为例：< / p >
< div class = "highlight-xml notranslate" > < div class = "highlight hljs" > < pre class = "xml" > < ?xml version=" 1.0" encoding=" UTF-8" ?>
< configuration>
< appender name=" APPLICATION" class=" ch.qos.logback.core.rolling.RollingFileAppender" >
< file> app.log< /file>
< rollingPolicy class=" ch.qos.logback.core.rolling.SizeAndTimeBasedRollingPolicy" >
< fileNamePattern> mylog-%d{yyyy-MM-dd}.%i.txt< /fileNamePattern>
< maxFileSize> 100MB< /maxFileSize>
< maxHistory> 60< /maxHistory>
< totalSizeCap> 2GB< /totalSizeCap>
< /rollingPolicy>
< encoder>
< pattern> %logger{35} - %msg%n< /pattern>
< /encoder>
< /appender>
< appender name=" ASYNC" class=" ch.qos.logback.classic.AsyncAppender" >
< appender-ref ref=" APPLICATION" />
< /appender>
< appender name=" CONSOLE" class=" ch.qos.logback.core.ConsoleAppender" >
< encoder>
< pattern> %-4relative [%thread] %-5level %logger{35} - %msg %n
< /pattern>
< charset> utf8< /charset>
< /encoder>
< /appender>
< root level=" INFO" >
< appender-ref ref=" CONSOLE" />
< appender-ref ref=" ASYNC" />
< /root>
< /configuration> < / pre > < / div >
< / div >
< p > 使用< code class = "docutils literal notranslate" > < span class = "pre" > logger< / span > < / code > 命令打印的结果是：< / p >
< div class = "highlight-bash notranslate" > < div class = "highlight hljs" > < pre class = "bash" > [arthas@2062]$ logger
name ROOT
class ch.qos.logback.classic.Logger
classLoader sun.misc.Launcher$AppClassLoader@2a139a55
classLoaderHash 2a139a55
level INFO
effectiveLevel INFO
additivity true
codeSource file:/Users/hengyunabc/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar
appenders name CONSOLE
class ch.qos.logback.core.ConsoleAppender
classLoader sun.misc.Launcher$AppClassLoader@2a139a55
classLoaderHash 2a139a55
target System.out
name APPLICATION
class ch.qos.logback.core.rolling.RollingFileAppender
classLoader sun.misc.Launcher$AppClassLoader@2a139a55
classLoaderHash 2a139a55
file app.log
name ASYNC
class ch.qos.logback.classic.AsyncAppender
classLoader sun.misc.Launcher$AppClassLoader@2a139a55
classLoaderHash 2a139a55
appenderRef [APPLICATION]< / pre > < / div >
< / div >
< p > 从< code class = "docutils literal notranslate" > < span class = "pre" > appenders< / span > < / code > 的信息里，可以看到< / p >
< ul class = "simple" >
< li > < p > < code class = "docutils literal notranslate" > < span class = "pre" > CONSOLE< / span > < / code > logger的target是< code class = "docutils literal notranslate" > < span class = "pre" > System.out< / span > < / code > < / p > < / li >
< li > < p > < code class = "docutils literal notranslate" > < span class = "pre" > APPLICATION< / span > < / code > logger是< code class = "docutils literal notranslate" > < span class = "pre" > RollingFileAppender< / span > < / code > ， < code class = "docutils literal notranslate" > < span class = "pre" > app.log< / span > < / code > < / p > < / li >
< li > < p > < code class = "docutils literal notranslate" > < span class = "pre" > ASYNC< / span > < / code > 它的< code class = "docutils literal notranslate" > < span class = "pre" > appenderRef< / span > < / code > 是< code class = "docutils literal notranslate" > < span class = "pre" > APPLICATION< / span > < / code > ，即异步输出到文件里< / p > < / li >
< / ul >
< / div >
< div class = "section" id = "id3" >
< h3 > 查看指定名字的logger信息< a class = "headerlink" href = "#id3" title = "永久链接至标题" > ¶< / a > < / h3 >
< div class = "highlight-bash notranslate" > < div class = "highlight hljs" > < pre class = "bash" > [arthas@2062]$ logger -n org.springframework.web
name org.springframework.web
class ch.qos.logback.classic.Logger
classLoader sun.misc.Launcher$AppClassLoader@2a139a55
classLoaderHash 2a139a55
level null
effectiveLevel INFO
additivity true
codeSource file:/Users/hengyunabc/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar< / pre > < / div >
< / div >
< / div >
< div class = "section" id = "classloaderlogger" >
< h3 > 查看指定classloader的logger信息< a class = "headerlink" href = "#classloaderlogger" title = "永久链接至标题" > ¶< / a > < / h3 >
< div class = "highlight-bash notranslate" > < div class = "highlight hljs" > < pre class = "bash" > [arthas@2062]$ logger -c 2a139a55
name ROOT
class ch.qos.logback.classic.Logger
classLoader sun.misc.Launcher$AppClassLoader@2a139a55
classLoaderHash 2a139a55
level DEBUG
effectiveLevel DEBUG
additivity true
codeSource file:/Users/hengyunabc/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar
appenders name CONSOLE
class ch.qos.logback.core.ConsoleAppender
classLoader sun.misc.Launcher$AppClassLoader@2a139a55
classLoaderHash 2a139a55
target System.out
name APPLICATION
class ch.qos.logback.core.rolling.RollingFileAppender
classLoader sun.misc.Launcher$AppClassLoader@2a139a55
classLoaderHash 2a139a55
file app.log
name ASYNC
class ch.qos.logback.classic.AsyncAppender
classLoader sun.misc.Launcher$AppClassLoader@2a139a55
classLoaderHash 2a139a55
appenderRef [APPLICATION]< / pre > < / div >
< / div >
< / div >
< div class = "section" id = "logger-level" >
< h3 > 更新logger level< a class = "headerlink" href = "#logger-level" title = "永久链接至标题" > ¶< / a > < / h3 >
< div class = "highlight-bash notranslate" > < div class = "highlight hljs" > < pre class = "bash" > [arthas@2062]$ logger --name ROOT --level debug
update logger level success.< / pre > < / div >
< / div >
< / div >
< div class = "section" id = "classloader-logger-level" >
< h3 > 指定classloader更新 logger level< a class = "headerlink" href = "#classloader-logger-level" title = "永久链接至标题" > ¶< / a > < / h3 >
< p > 默认情况下， ， < code class = "docutils literal notranslate" > < span class = "pre" > war< / span > < / code > 应用， ， < / p >
< p > 可以先用 < code class = "docutils literal notranslate" > < span class = "pre" > sc< / span > < span class = "pre" > -d< / span > < span class = "pre" > yourClassName< / span > < / code > 来查看具体的 classloader hashcode， ： < / p >
< div class = "highlight-bash notranslate" > < div class = "highlight hljs" > < pre class = "bash" > [arthas@2062]$ logger -c 2a139a55 --name ROOT --level debug< / pre > < / div >
< / div >
< / div >
< div class = "section" id = "appenderlogger" >
< h3 > 查看没有appender的logger的信息< a class = "headerlink" href = "#appenderlogger" title = "永久链接至标题" > ¶< / a > < / h3 >
< p > 默认情况下，< code class = "docutils literal notranslate" > < span class = "pre" > logger< / span > < / code > 命令只打印有appender的logger的信息。如果想查看没有< code class = "docutils literal notranslate" > < span class = "pre" > appender< / span > < / code > 的logger的信息， < code class = "docutils literal notranslate" > < span class = "pre" > --include-no-appender< / span > < / code > 。< / p >
< p > 注意，通常输出结果会很长。< / p >
< div class = "highlight-bash notranslate" > < div class = "highlight hljs" > < pre class = "bash" > [arthas@2062]$ logger --include-no-appender
name ROOT
class ch.qos.logback.classic.Logger
classLoader sun.misc.Launcher$AppClassLoader@2a139a55
classLoaderHash 2a139a55
level DEBUG
effectiveLevel DEBUG
additivity true
codeSource file:/Users/hengyunabc/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar
appenders name CONSOLE
class ch.qos.logback.core.ConsoleAppender
classLoader sun.misc.Launcher$AppClassLoader@2a139a55
classLoaderHash 2a139a55
target System.out
name APPLICATION
class ch.qos.logback.core.rolling.RollingFileAppender
classLoader sun.misc.Launcher$AppClassLoader@2a139a55
classLoaderHash 2a139a55
file app.log
name ASYNC
class ch.qos.logback.classic.AsyncAppender
classLoader sun.misc.Launcher$AppClassLoader@2a139a55
classLoaderHash 2a139a55
appenderRef [APPLICATION]
name com
class ch.qos.logback.classic.Logger
classLoader sun.misc.Launcher$AppClassLoader@2a139a55
classLoaderHash 2a139a55
level null
effectiveLevel DEBUG
additivity true
codeSource file:/Users/hengyunabc/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar
name com.alibaba
class ch.qos.logback.classic.Logger
classLoader sun.misc.Launcher$AppClassLoader@2a139a55
classLoaderHash 2a139a55
level null
effectiveLevel DEBUG
additivity true
codeSource file:/Users/hengyunabc/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar
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< script src = "https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.13.1/highlight.min.js" > < / script >
< script src = "https://cdnjs.cloudflare.com/ajax/libs/highlightjs-line-numbers.js/2.5.0/highlightjs-line-numbers.min.js" > < / script >
< script >
document.querySelectorAll('div.hljs > pre').forEach(function(block) {
hljs.highlightBlock(block);
hljs.lineNumbersBlock(block);
});
< / script >
< script >
var _hmt = _hmt || [];
(function() {
var hm = document.createElement("script");
if (window.location.hostname == "arthas.gitee.io") {
hm.src = "https://hm.baidu.com/hm.js?ecc1b0d9aeb73da1671876133211d4d3";
} else { // https://alibaba.github.io/arthas/
hm.src = "https://hm.baidu.com/hm.js?d5c5e25b100f0eb51a4c35c8a86ea9b4";
}
var s = document.getElementsByTagName("script")[0];
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