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<div class="section" id="ognl">
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<span id="ognl"></span><h1>ognl<a class="headerlink" href="#ognl" title="永久链接至标题">¶</a></h1>
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<blockquote>
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<div>执行ognl表达式</div></blockquote>
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<p>从3.0.5版本增加</p>
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<div class="section" id="">
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<span id="id1"></span><h2>参数说明<a class="headerlink" href="#" title="永久链接至标题">¶</a></h2>
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<table border="1" class="docutils">
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<thead>
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<tr>
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<th align="right">参数名称</th>
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<th align="left">参数说明</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td align="right"><em>express</em></td>
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<td align="left">执行的表达式</td>
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</tr>
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<tr>
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<td align="right"><code>[c:]</code></td>
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<td align="left">执行表达式的 ClassLoader 的 hashcode，默认值是SystemClassLoader</td>
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</tr>
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<tr>
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<td align="right">[x]</td>
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<td align="left">结果对象的展开层次，默认值1</td>
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</tr>
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</tbody>
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</table></div>
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<div class="section" id="">
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<span id="id2"></span><h2>使用参考<a class="headerlink" href="#" title="永久链接至标题">¶</a></h2>
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<ul class="simple">
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<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>
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<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>
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</ul>
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<p>调用静态函数：</p>
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<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$ ognl <span class="s1">'@java.lang.System@out.println("hello")'</span>
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null
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</pre></div>
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</div>
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<p>获取静态类的静态字段：</p>
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<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$ ognl <span class="s1">'@demo.MathGame@random'</span>
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@Random<span class="o">[</span>
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<span class="nv">serialVersionUID</span><span class="o">=</span>@Long<span class="o">[</span><span class="m">3905348978240129619</span><span class="o">]</span>,
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<span class="nv">seed</span><span class="o">=</span>@AtomicLong<span class="o">[</span><span class="m">125451474443703</span><span class="o">]</span>,
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<span class="nv">multiplier</span><span class="o">=</span>@Long<span class="o">[</span><span class="m">25214903917</span><span class="o">]</span>,
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<span class="nv">addend</span><span class="o">=</span>@Long<span class="o">[</span><span class="m">11</span><span class="o">]</span>,
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<span class="nv">mask</span><span class="o">=</span>@Long<span class="o">[</span><span class="m">281474976710655</span><span class="o">]</span>,
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<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>,
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<span class="nv">BadBound</span><span class="o">=</span>@String<span class="o">[</span>bound must be positive<span class="o">]</span>,
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<span class="nv">BadRange</span><span class="o">=</span>@String<span class="o">[</span>bound must be greater than origin<span class="o">]</span>,
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<span class="nv">BadSize</span><span class="o">=</span>@String<span class="o">[</span>size must be non-negative<span class="o">]</span>,
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<span class="nv">seedUniquifier</span><span class="o">=</span>@AtomicLong<span class="o">[</span>-3282039941672302964<span class="o">]</span>,
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<span class="nv">nextNextGaussian</span><span class="o">=</span>@Double<span class="o">[</span><span class="m">0</span>.0<span class="o">]</span>,
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<span class="nv">haveNextNextGaussian</span><span class="o">=</span>@Boolean<span class="o">[</span>false<span class="o">]</span>,
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<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>,
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<span class="nv">unsafe</span><span class="o">=</span>@Unsafe<span class="o">[</span>sun.misc.Unsafe@28ea5898<span class="o">]</span>,
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<span class="nv">seedOffset</span><span class="o">=</span>@Long<span class="o">[</span><span class="m">24</span><span class="o">]</span>,
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<span class="o">]</span>
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</pre></div>
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</div>
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<p>执行多行表达式，赋值给临时变量，返回一个List：</p>
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<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>
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@ArrayList<span class="o">[</span>
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@String<span class="o">[</span>/opt/java/8.0.181-zulu/jre<span class="o">]</span>,
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@String<span class="o">[</span>OpenJDK Runtime Environment<span class="o">]</span>,
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<span class="o">]</span>
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</pre></div>
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