JMeter 在 beanshell 中设置用户定义的变量不起作用

Question

我想在 beanshell 中覆盖 Jmeter 中的用户定义变量。我尝试了 beanshell 预处理器、后处理器或示例，但没有任何效果。

我的代码：

vars.put("box_user", "mybox");
log.info(vars.get("box_user"));

输出是正确的，mybox。但是当我稍后在采样器中使用 ${box_user} 变量时，用户名不正确。它具有开始初始化的价值。

怎么了？

这是我的 jmeter 项目的 xml，尝试了另一个变量名，但它不起作用：

<?xml version="1.0" encoding="UTF-8"?>
    <jmeterTestPlan version="1.2" properties="2.8" jmeter="2.13 r1665067">
     <hashTree>
    <TestPlan guiclass="TestPlanGui" testclass="TestPlan" testname="Test Plan" enabled="true">
      <stringProp name="TestPlan.comments"></stringProp>
      <boolProp name="TestPlan.functional_mode">false</boolProp>
      <boolProp name="TestPlan.serialize_threadgroups">false</boolProp>
      <elementProp name="TestPlan.user_defined_variables" elementType="Arguments" guiclass="ArgumentsPanel" testclass="Arguments" testname="User Defined Variables" enabled="true">
        <collectionProp name="Arguments.arguments"/>
      </elementProp>
      <stringProp name="TestPlan.user_define_classpath"></stringProp>
    </TestPlan>
    <hashTree>
      <ThreadGroup guiclass="ThreadGroupGui" testclass="ThreadGroup" testname="Thread Group" enabled="true">
        <stringProp name="ThreadGroup.on_sample_error">continue</stringProp>
        <elementProp name="ThreadGroup.main_controller" elementType="LoopController" guiclass="LoopControlPanel" testclass="LoopController" testname="Loop Controller" enabled="true">
          <boolProp name="LoopController.continue_forever">false</boolProp>
          <stringProp name="LoopController.loops">1</stringProp>
        </elementProp>
        <stringProp name="ThreadGroup.num_threads">1</stringProp>
        <stringProp name="ThreadGroup.ramp_time">1</stringProp>
        <longProp name="ThreadGroup.start_time">1441359197000</longProp>
        <longProp name="ThreadGroup.end_time">1441359197000</longProp>
        <boolProp name="ThreadGroup.scheduler">false</boolProp>
        <stringProp name="ThreadGroup.duration"></stringProp>
        <stringProp name="ThreadGroup.delay"></stringProp>
      </ThreadGroup>
      <hashTree>
        <BeanShellSampler guiclass="BeanShellSamplerGui" testclass="BeanShellSampler" testname="BeanShell Sampler" enabled="true">
          <stringProp name="BeanShellSampler.query">vars.put(&quot;user&quot;, &quot;one&quot;);
vars.put(&quot;host&quot;, &quot;localhost&quot;);</stringProp>
          <stringProp name="BeanShellSampler.filename"></stringProp>
          <stringProp name="BeanShellSampler.parameters"></stringProp>
          <boolProp name="BeanShellSampler.resetInterpreter">false</boolProp>
        </BeanShellSampler>
        <hashTree/>
        <JDBCDataSource guiclass="TestBeanGUI" testclass="JDBCDataSource" testname="JDBC Connection Configuration" enabled="true">
          <stringProp name="dataSource">dbcon</stringProp>
          <stringProp name="poolMax">10</stringProp>
          <stringProp name="timeout">10000</stringProp>
          <stringProp name="trimInterval">60000</stringProp>
          <boolProp name="autocommit">true</boolProp>
          <stringProp name="transactionIsolation">DEFAULT</stringProp>
          <boolProp name="keepAlive">true</boolProp>
          <stringProp name="connectionAge">5000</stringProp>
          <stringProp name="checkQuery">Select 1</stringProp>
          <stringProp name="dbUrl">jdbc:postgresql://localhost:5432/box</stringProp>
          <stringProp name="driver">org.postgresql.Driver</stringProp>
          <stringProp name="username">${user}</stringProp>
          <stringProp name="password">pwd</stringProp>
        </JDBCDataSource>
        <hashTree/>
        <JDBCSampler guiclass="TestBeanGUI" testclass="JDBCSampler" testname="JDBC Request" enabled="true">
          <stringProp name="dataSource">dbcon</stringProp>
          <stringProp name="queryType">Select Statement</stringProp>
          <stringProp name="query">SELECT 1</stringProp>
          <stringProp name="queryArguments"></stringProp>
          <stringProp name="queryArgumentsTypes"></stringProp>
          <stringProp name="variableNames"></stringProp>
          <stringProp name="resultVariable"></stringProp>
          <stringProp name="queryTimeout"></stringProp>
          <stringProp name="resultSetHandler">Store as String</stringProp>
        </JDBCSampler>
        <hashTree/>
        <ResultCollector guiclass="ViewResultsFullVisualizer" testclass="ResultCollector" testname="View Results Tree" enabled="true">
          <boolProp name="ResultCollector.error_logging">false</boolProp>
          <objProp>
            <name>saveConfig</name>
            <value class="SampleSaveConfiguration">
              <time>true</time>
              <latency>true</latency>
              <timestamp>true</timestamp>
              <success>true</success>
              <label>true</label>
              <code>true</code>
              <message>true</message>
              <threadName>true</threadName>
              <dataType>true</dataType>
              <encoding>false</encoding>
              <assertions>true</assertions>
              <subresults>true</subresults>
              <responseData>false</responseData>
              <samplerData>false</samplerData>
              <xml>false</xml>
              <fieldNames>false</fieldNames>
              <responseHeaders>false</responseHeaders>
              <requestHeaders>false</requestHeaders>
              <responseDataOnError>false</responseDataOnError>
              <saveAssertionResultsFailureMessage>false</saveAssertionResultsFailureMessage>
              <assertionsResultsToSave>0</assertionsResultsToSave>
              <bytes>true</bytes>
              <threadCounts>true</threadCounts>
            </value>
          </objProp>
          <stringProp name="filename"></stringProp>
        </ResultCollector>
        <hashTree/>
      </hashTree>
    </hashTree>
  </hashTree>
</jmeterTestPlan>

错误是：致命：角色“${user}”不存在 -> 所以我的变量没有被替换，我不知道为什么

Answer 1

您是否有可能在不同的线程组中引用变量？如果是，则需要使用 JMeter 属性，例如：

props.put("box_user", "mybox");

稍后用于${__P(box_user,)}访问该值。

这是由于 JMeter 变量的可见性范围仅限于当前线程组，根据函数和变量章节：

属性与变量不同。变量是线程的局部变量；属性对所有线程都是通用的，需要使用 __P 或 __property 函数来引用。

请参阅如何在不同线程组中使用变量。指南了解更多详情。