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< h1 > getstatic< a class = "headerlink" href = "#getstatic" title = "永久链接至标题" > ¶< / a > < / h1 >
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< li > < p > 推荐直接使用< a class = "reference internal" href = "ognl.html" > < span class = "doc" > ognl< / span > < / a > 命令,更加灵活。< / p > < / li >
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< p > 通过getstatic命令可以方便的查看类的静态属性。使用方法为< code class = "docutils literal notranslate" > < span class = "pre" > getstatic< / span > < span class = "pre" > class_name< / span > < span class = "pre" > field_name< / span > < / code > < / p >
< div class = "highlight-bash notranslate" > < div class = "highlight hljs" > < pre class = "bash" > $ getstatic demo.MathGame random
field: random
@Random[
serialVersionUID=@Long[3905348978240129619],
seed=@AtomicLong[120955813885284],
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@2eaa1027],
seedOffset=@Long[24],
]< / pre > < / div >
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< p > 如果该静态属性是一个复杂对象, 还可以支持在该属性上通过ognl表示进行遍历, 过滤, 访问对象的内部属性等操作。< / p >
< 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 > 例如, 假设n是一个Map, Map的Key是一个Enum, 我们想过滤出Map中Key为某个Enum的值, 可以写如下命令< / p >
< div class = "highlight-default notranslate" > < pre class = "literal-block" > $ getstatic com.alibaba.arthas.Test n ' entrySet().iterator.{? #this.key.name()==" STOP" }'
field: n
@ArrayList[
@Node[STOP=bbb],
]
Affect(row-cnt:1) cost in 68 ms.
$ getstatic com.alibaba.arthas.Test m ' entrySet().iterator.{? #this.key==" a" }'
field: m
@ArrayList[
@Node[a=aaa],
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