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< h1 > ognl< a class = "headerlink" href = "#ognl" title = "永久链接至标题" > ¶< / a > < / h1 >
< p > < a class = "reference external" href = "https://arthas.aliyun.com/doc/arthas-tutorials?language=cn&id=command-ognl" > < code class = "docutils literal notranslate" > < span class = "pre" > ognl< / span > < / code > 在线教程< / a > < / p >
< blockquote >
< div > < p > 执行ognl表达式< / p >
< / div > < / blockquote >
< p > 从3.0.5版本增加< / p >
< div class = "section" id = "id1" >
< h2 > 参数说明< a class = "headerlink" href = "#id1" title = "永久链接至标题" > ¶< / a > < / h2 >
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< tr >
< th align = "right" > 参数名称< / th >
< th align = "left" > 参数说明< / th >
< / tr >
< / thead >
< tbody >
< tr >
< td align = "right" > < em > express< / em > < / td >
< td align = "left" > 执行的表达式< / td >
< / tr >
< tr >
< td align = "right" > < code > [c:]< / code > < / td >
< td align = "left" > 执行表达式的 ClassLoader 的 hashcode， < / td >
< / tr >
< tr >
< td align = "right" > < code > [classLoaderClass:]< / code > < / td >
< td align = "left" > 指定执行表达式的 ClassLoader 的 class name< / td >
< / tr >
< tr >
< td align = "right" > [x]< / td >
< td align = "left" > 结果对象的展开层次， < / td >
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< h2 > 使用参考< a class = "headerlink" href = "#id2" title = "永久链接至标题" > ¶< / a > < / h2 >
< ul class = "simple" >
< li > < p > OGNL特殊用法请参考： < a class = "reference external" href = "https://github.com/alibaba/arthas/issues/71" > https://github.com/alibaba/arthas/issues/71< / a > < / p > < / li >
< li > < p > OGNL表达式官方指南： < a class = "reference external" href = "https://commons.apache.org/proper/commons-ognl/language-guide.html" > https://commons.apache.org/proper/commons-ognl/language-guide.html< / a > < / p > < / li >
< / ul >
< p > 调用静态函数：< / p >
< div class = "highlight-bash notranslate" > < div class = "highlight hljs" > < pre class = "bash" > $ ognl ' @java.lang.System@out.println(" hello" )'
null< / pre > < / div >
< / div >
< p > 获取静态类的静态字段：< / p >
< div class = "highlight-bash notranslate" > < div class = "highlight hljs" > < pre class = "bash" > $ ognl ' @demo.MathGame@random'
@Random[
serialVersionUID=@Long[3905348978240129619],
seed=@AtomicLong[125451474443703],
multiplier=@Long[25214903917],
addend=@Long[11],
mask=@Long[281474976710655],
DOUBLE_UNIT=@Double[1.1102230246251565E-16],
BadBound=@String[bound must be positive],
BadRange=@String[bound must be greater than origin],
BadSize=@String[size must be non-negative],
seedUniquifier=@AtomicLong[-3282039941672302964],
nextNextGaussian=@Double[0.0],
haveNextNextGaussian=@Boolean[false],
serialPersistentFields=@ObjectStreamField[][isEmpty=false;size=3],
unsafe=@Unsafe[sun.misc.Unsafe@28ea5898],
seedOffset=@Long[24],
]< / pre > < / div >
< / div >
< p > 通过hashcode指定ClassLoader： < / p >
< div class = "highlight-bash notranslate" > < div class = "highlight hljs" > < pre class = "bash" > $ classloader -t
+-BootstrapClassLoader
+-jdk.internal.loader.ClassLoaders$PlatformClassLoader@301ec38b
+-com.taobao.arthas.agent.ArthasClassloader@472067c7
+-jdk.internal.loader.ClassLoaders$AppClassLoader@4b85612c
+-org.springframework.boot.loader.LaunchedURLClassLoader@7f9a81e8
$ ognl -c 7f9a81e8 @org.springframework.boot.SpringApplication@logger
@Slf4jLocationAwareLog[
FQCN=@String[org.apache.commons.logging.LogAdapter$Slf4jLocationAwareLog],
name=@String[org.springframework.boot.SpringApplication],
logger=@Logger[Logger[org.springframework.boot.SpringApplication]],
]
$ < / pre > < / div >
< / div >
< p > 注意hashcode是变化的， ， < / p >
< p > 对于只有唯一实例的ClassLoader可以通过class name指定， ： < / p >
< div class = "highlight-bash notranslate" > < div class = "highlight hljs" > < pre class = "bash" > $ ognl --classLoaderClass org.springframework.boot.loader.LaunchedURLClassLoader @org.springframework.boot.SpringApplication@logger
@Slf4jLocationAwareLog[
FQCN=@String[org.apache.commons.logging.LogAdapter$Slf4jLocationAwareLog],
name=@String[org.springframework.boot.SpringApplication],
logger=@Logger[Logger[org.springframework.boot.SpringApplication]],
]< / pre > < / div >
< / div >
< p > 执行多行表达式， ， ： < / p >
< div class = "highlight-bash notranslate" > < div class = "highlight hljs" > < pre class = "bash" > $ ognl ' #value1=@System@getProperty(" java.home" ), #value2=@System@getProperty(" java.runtime.name" ), {#value1, #value2}'
@ArrayList[
@String[/opt/java/8.0.181-zulu/jre],
@String[OpenJDK Runtime Environment],
]< / pre > < / div >
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