<!DOCTYPE html>
<!--[if IE 8]><html class="no-js lt-ie9" lang="zh-CN" > <![endif]-->
<!--[if gt IE 8]><!--> <html class="no-js" lang="zh-CN" > <!--<![endif]-->
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>ognl — Arthas 3.0.6-SNAPSHOT 文档</title>
<link rel="shortcut icon" href="_static/favicon.ico"/>
<link rel="stylesheet" href="_static/css/theme.css" type="text/css" />
<link rel="stylesheet" href="_static/pygments.css" type="text/css" />
<link rel="stylesheet" href="_static/overrides.css" type="text/css" />
<link rel="index" title="索引" href="genindex.html" />
<link rel="search" title="搜索" href="search.html" />
<link rel="next" title="sc" href="sc.html" />
<link rel="prev" title="getstatic" href="getstatic.html" />
<script src="_static/center_page.js"></script>
<script src="_static/js/modernizr.min.js"></script>
</head>
<body class="wy-body-for-nav">
<div class="wy-grid-for-nav">
<nav data-toggle="wy-nav-shift" class="wy-nav-side">
<div class="wy-side-scroll">
<div class="wy-side-nav-search">
<a href="index.html" class="icon icon-home"> Arthas
</a>
<div class="version">
3.0.6-SNAPSHOT
</div>
<div role="search">
<form id="rtd-search-form" class="wy-form" action="search.html" method="get">
<input type="text" name="q" placeholder="Search docs" />
<input type="hidden" name="check_keywords" value="yes" />
<input type="hidden" name="area" value="default" />
</form>
</div>
</div>
<div class="wy-menu wy-menu-vertical" data-spy="affix" role="navigation" aria-label="main navigation">
<ul class="current">
<li class="toctree-l1"><a class="reference external" href="https://alibaba.github.io/arthas/en/">English Docs</a></li>
<li class="toctree-l1"><a class="reference internal" href="install-detail.html">安装</a></li>
<li class="toctree-l1"><a class="reference internal" href="quick-start.html">快速入门</a></li>
<li class="toctree-l1"><a class="reference internal" href="advanced-use.html">进阶使用</a></li>
<li class="toctree-l1 current"><a class="reference internal" href="commands.html">命令列表</a><ul class="current">
<li class="toctree-l2"><a class="reference internal" href="dashboard.html">dashboard</a></li>
<li class="toctree-l2"><a class="reference internal" href="thread.html">thread</a></li>
<li class="toctree-l2"><a class="reference internal" href="jvm.html">jvm</a></li>
<li class="toctree-l2"><a class="reference internal" href="sysprop.html">sysprop</a></li>
<li class="toctree-l2"><a class="reference internal" href="sysenv.html">sysenv</a></li>
<li class="toctree-l2"><a class="reference internal" href="getstatic.html">getstatic</a></li>
<li class="toctree-l2 current"><a class="current reference internal" href="#">ognl</a><ul>
<li class="toctree-l3"><a class="reference internal" href="#">参数说明</a></li>
<li class="toctree-l3"><a class="reference internal" href="#">使用参考</a></li>
</ul>
</li>
<li class="toctree-l2"><a class="reference internal" href="sc.html">sc</a></li>
<li class="toctree-l2"><a class="reference internal" href="sm.html">sm</a></li>
<li class="toctree-l2"><a class="reference internal" href="dump.html">dump</a></li>
<li class="toctree-l2"><a class="reference internal" href="jad.html">jad</a></li>
<li class="toctree-l2"><a class="reference internal" href="classloader.html">classloader</a></li>
<li class="toctree-l2"><a class="reference internal" href="redefine.html">redefine</a></li>
<li class="toctree-l2"><a class="reference internal" href="monitor.html">monitor</a></li>
<li class="toctree-l2"><a class="reference internal" href="watch.html">watch</a></li>
<li class="toctree-l2"><a class="reference internal" href="trace.html">trace</a></li>
<li class="toctree-l2"><a class="reference internal" href="stack.html">stack</a></li>
<li class="toctree-l2"><a class="reference internal" href="tt.html">tt</a></li>
<li class="toctree-l2"><a class="reference internal" href="options.html">options</a></li>
<li class="toctree-l2"><a class="reference internal" href="commands.html#arthas">Arthas 基础命令</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference external" href="https://github.com/alibaba/arthas/issues?q=label%3Auser-case">用户案例</a></li>
<li class="toctree-l1"><a class="reference external" href="https://github.com/alibaba/arthas/issues?q=label%3Aquestion-answered">Questions and answers</a></li>
<li class="toctree-l1"><a class="reference external" href="https://github.com/alibaba/arthas">Fork me at GitHub</a></li>
<li class="toctree-l1"><a class="reference external" href="https://github.com/alibaba/arthas/blob/master/CONTRIBUTING.md">参与贡献</a></li>
<li class="toctree-l1"><a class="reference internal" href="release-notes.html">Release Notes</a></li>
<li class="toctree-l1"><a class="reference internal" href="contact-us.html">QQ群/钉钉群</a></li>
</ul>
</div>
</div>
</nav>
<section data-toggle="wy-nav-shift" class="wy-nav-content-wrap">
<nav class="wy-nav-top" aria-label="top navigation">
<i data-toggle="wy-nav-top" class="fa fa-bars"></i>
<a href="index.html">Arthas</a>
</nav>
<div class="wy-nav-content">
<div class="rst-content">
<div role="navigation" aria-label="breadcrumbs navigation">
<ul class="wy-breadcrumbs">
<li><a href="index.html">Docs</a> »</li>
<li><a href="commands.html">命令列表</a> »</li>
<li>ognl</li>
<li class="wy-breadcrumbs-aside">
<a href="https://github.com/alibaba/arthas/blob/master/site/src/site/sphinx/ognl.md" class="fa fa-github"> Edit on GitHub</a>
</li>
</ul>
<hr/>
</div>
<div role="main" class="document" itemscope="itemscope" itemtype="http://schema.org/Article">
<div itemprop="articleBody">
<div class="section" id="ognl">
<span id="ognl"></span><h1>ognl<a class="headerlink" href="#ognl" title="永久链接至标题">¶</a></h1>
<blockquote>
<div>执行ognl表达式</div></blockquote>
<p>从3.0.5版本增加</p>
<div class="section" id="">
<span id="id1"></span><h2>参数说明<a class="headerlink" href="#" title="永久链接至标题">¶</a></h2>
<table border="1" class="docutils">
<thead>
<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，默认值是SystemClassLoader</td>
</tr>
<tr>
<td align="right">[x]</td>
<td align="left">结果对象的展开层次，默认值1</td>
</tr>
</tbody>
</table></div>
<div class="section" id="">
<span id="id2"></span><h2>使用参考<a class="headerlink" href="#" title="永久链接至标题">¶</a></h2>
<ul class="simple">
<li>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></li>
<li>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></li>
</ul>
<p>调用静态函数：</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$ ognl <span class="s1">'@java.lang.System@out.println("hello")'</span>
null
</pre></div>
</div>
<p>获取静态类的静态字段：</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$ ognl <span class="s1">'@demo.MathGame@random'</span>
@Random<span class="o">[</span>
<span class="nv">serialVersionUID</span><span class="o">=</span>@Long<span class="o">[</span><span class="m">3905348978240129619</span><span class="o">]</span>,
<span class="nv">seed</span><span class="o">=</span>@AtomicLong<span class="o">[</span><span class="m">125451474443703</span><span class="o">]</span>,
<span class="nv">multiplier</span><span class="o">=</span>@Long<span class="o">[</span><span class="m">25214903917</span><span class="o">]</span>,
<span class="nv">addend</span><span class="o">=</span>@Long<span class="o">[</span><span class="m">11</span><span class="o">]</span>,
<span class="nv">mask</span><span class="o">=</span>@Long<span class="o">[</span><span class="m">281474976710655</span><span class="o">]</span>,
<span class="nv">DOUBLE_UNIT</span><span class="o">=</span>@Double<span class="o">[</span><span class="m">1</span>.1102230246251565E-16<span class="o">]</span>,
<span class="nv">BadBound</span><span class="o">=</span>@String<span class="o">[</span>bound must be positive<span class="o">]</span>,
<span class="nv">BadRange</span><span class="o">=</span>@String<span class="o">[</span>bound must be greater than origin<span class="o">]</span>,
<span class="nv">BadSize</span><span class="o">=</span>@String<span class="o">[</span>size must be non-negative<span class="o">]</span>,
<span class="nv">seedUniquifier</span><span class="o">=</span>@AtomicLong<span class="o">[</span>-3282039941672302964<span class="o">]</span>,
<span class="nv">nextNextGaussian</span><span class="o">=</span>@Double<span class="o">[</span><span class="m">0</span>.0<span class="o">]</span>,
<span class="nv">haveNextNextGaussian</span><span class="o">=</span>@Boolean<span class="o">[</span>false<span class="o">]</span>,
<span class="nv">serialPersistentFields</span><span class="o">=</span>@ObjectStreamField<span class="o">[][</span><span class="nv">isEmpty</span><span class="o">=</span>false<span class="p">;</span><span class="nv">size</span><span class="o">=</span><span class="m">3</span><span class="o">]</span>,
<span class="nv">unsafe</span><span class="o">=</span>@Unsafe<span class="o">[</span>sun.misc.Unsafe@28ea5898<span class="o">]</span>,
<span class="nv">seedOffset</span><span class="o">=</span>@Long<span class="o">[</span><span class="m">24</span><span class="o">]</span>,
<span class="o">]</span>
</pre></div>
</div>
<p>执行多行表达式，赋值给临时变量，返回一个List：</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$ ognl <span class="s1">'#value1=@System@getProperty("java.home"), #value2=@System@getProperty("java.runtime.name"), {#value1, #value2}'</span>
@ArrayList<span class="o">[</span>
@String<span class="o">[</span>/opt/java/8.0.181-zulu/jre<span class="o">]</span>,
@String<span class="o">[</span>OpenJDK Runtime Environment<span class="o">]</span>,
<span class="o">]</span>
</pre></div>
</div>
</div>
</div>
</div>
</div>
<footer>
<div class="rst-footer-buttons" role="navigation" aria-label="footer navigation">
<a href="sc.html" class="btn btn-neutral float-right" title="sc" accesskey="n" rel="next">Next <span class="fa fa-arrow-circle-right"></span></a>
<a href="getstatic.html" class="btn btn-neutral" title="getstatic" accesskey="p" rel="prev"><span class="fa fa-arrow-circle-left"></span> Previous</a>
</div>
<hr/>
<div role="contentinfo">
<p>
© Copyright 2018, Alibaba Middleware Group, and contributors.
</p>
</div>
Built with <a href="http://sphinx-doc.org/">Sphinx</a> using a <a href="https://github.com/rtfd/sphinx_rtd_theme">theme</a> provided by <a href="https://readthedocs.org">Read the Docs</a>.
</footer>
</div>
</div>
</section>
</div>
<script type="text/javascript">
var DOCUMENTATION_OPTIONS = {
URL_ROOT:'./',
VERSION:'3.0.6-SNAPSHOT',
LANGUAGE:'zh_CN',
COLLAPSE_INDEX:false,
FILE_SUFFIX:'.html',
HAS_SOURCE: true,
SOURCELINK_SUFFIX: '.txt'
};
</script>
<script type="text/javascript" src="_static/jquery.js"></script>
<script type="text/javascript" src="_static/underscore.js"></script>
<script type="text/javascript" src="_static/doctools.js"></script>
<script type="text/javascript" src="_static/translations.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>
<script type="text/javascript" src="_static/js/theme.js"></script>
<script type="text/javascript">
jQuery(function () {
SphinxRtdTheme.Navigation.enable(true);
});
</script>
<div class="github-fork-ribbon-wrapper right">
<div class="github-fork-ribbon">
<a href="https://github.com/alibaba/arthas">Fork me at GitHub</a>
</div>
</div>
<script type="text/javascript" src="_static/add_badges.js"></script>
<script>
var _hmt = _hmt || [];
(function() {
var hm = document.createElement("script");
hm.src = "https://hm.baidu.com/hm.js?d5c5e25b100f0eb51a4c35c8a86ea9b4";
var s = document.getElementsByTagName("script")[0];
s.parentNode.insertBefore(hm, s);
})();
</script>
</body>
</html>