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<div class="section" id="ognl">
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<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><p>执行ognl表达式</p>
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</div></blockquote>
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<p>从3.0.5版本增加</p>
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<div class="section" id="id1">
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<h2>参数说明<a class="headerlink" href="#id1" 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="id2">
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<h2>使用参考<a class="headerlink" href="#id2" title="永久链接至标题">¶</a></h2>
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<ul class="simple">
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<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>
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<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>
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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 hljs"><pre class="bash">$ ognl '@java.lang.System@out.println("hello")'
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null</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 hljs"><pre class="bash">$ ognl '@demo.MathGame@random'
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@Random[
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serialVersionUID=@Long[3905348978240129619],
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seed=@AtomicLong[125451474443703],
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multiplier=@Long[25214903917],
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addend=@Long[11],
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mask=@Long[281474976710655],
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DOUBLE_UNIT=@Double[1.1102230246251565E-16],
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BadBound=@String[bound must be positive],
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BadRange=@String[bound must be greater than origin],
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BadSize=@String[size must be non-negative],
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seedUniquifier=@AtomicLong[-3282039941672302964],
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nextNextGaussian=@Double[0.0],
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haveNextNextGaussian=@Boolean[false],
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serialPersistentFields=@ObjectStreamField[][isEmpty=false;size=3],
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unsafe=@Unsafe[sun.misc.Unsafe@28ea5898],
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seedOffset=@Long[24],
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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 hljs"><pre class="bash">$ ognl '#value1=@System@getProperty("java.home"), #value2=@System@getProperty("java.runtime.name"), {#value1, #value2}'
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@ArrayList[
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@String[/opt/java/8.0.181-zulu/jre],
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@String[OpenJDK Runtime Environment],
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]</pre></div>
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(function() {
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var hm = document.createElement("script");
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if (window.location.hostname == "arthas.gitee.io") {
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hm.src = "https://hm.baidu.com/hm.js?ecc1b0d9aeb73da1671876133211d4d3";
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} else { // https://alibaba.github.io/arthas/
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hm.src = "https://hm.baidu.com/hm.js?d5c5e25b100f0eb51a4c35c8a86ea9b4";
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}
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var s = document.getElementsByTagName("script")[0];
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s.parentNode.insertBefore(hm, s);
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})();
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</script>
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<script>
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var meta = document.createElement('meta');
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meta.setAttribute('name', 'data-spm');
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meta.setAttribute('content', 'a2cmt');
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document.getElementsByTagName('head')[0].appendChild(meta);
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document.getElementsByTagName('body')[0].setAttribute("data-spm","17702181")
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</script>
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</body>
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</html> |