如何在代码中读取JMeter测试计划中的变量？

Question

在我的java代码中，如何访问存储在JMeter测试计划(jmx文件)中的值？特别是尝试获取ThreadGroup.num_threads，这样我的测试代码就可以知道在测试中使用了多少线程。

谢谢你的回复。下面是我最终使用的代码：

    int testThreadCount = 0;
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    DocumentBuilder builder = factory.newDocumentBuilder();
    Document testPlanFile = builder.parse(new File("path/to/testplan.jmx"));
    NodeList nodes = testPlanFile.getElementsByTagName("stringProp");
    for (int i = 0; i < nodes.getLength(); ++i)
    {
        Node node = nodes.item(i);
        Element element = (Element)node;
        String propName = element.getAttribute("name");
        if (propName.equals("ThreadGroup.num_threads"))
        {
            testThreadCount = Integer.parseInt(element.getChildNodes().item(0).getNodeValue());
            break;
        }
    }

Answer 1

1. Java方式(如果您打算使用Java API and XPath从.jmx文件中获取值)

DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance()；DocumentBuilder builder = builderFactory.newDocumentBuilder()；Document xmlDocument =builder.parse(新建文件(“/DocumentBuilderFactory/to/test.jmx”))；XPath表达式= XPathFactory.newInstance().newXPath()；String expression =test.jmx NodeList = (NodeList) test.jmx XPathConstants.NODESET)；for (int i= 0；i< matches.getLength()；){System.out.println(“线程组”+ (i + 1) +“users =”+ matches.item(i).getTextContent())；i++；}

• JMeter way (如果使用的是JMeter API to read .jmx file)

JMeterUtils.loadJMeterProperties("/path/to/jmeter.properties")；JMeterUtils.setJMeterHome("/path/to/ jmeter ")；JMeterUtils.initLogging()；JMeterUtils.initLocale()；SaveService.loadProperties()；StandardJMeterEngine jmeter= StandardJMeterEngine()；HashTree testPlanTree =SaveService.loadTree(新建文件(“/path/to/test.jmx”))；JMeterTreeModel treeModel =新建JMeterTreeModel(新建对象())；JMeterTreeNode根= (JMeterTreeNode) treeModel.getRoot()；treeModel.addSubTree(testPlanTree，根)；SearchByClass = new ()；testPlanTree.traverse(threadGroups)；集合threadGroupsRes = threadGroups.getSearchResults()；对于(ThreadGroup threadGroup : threadGroupsRes) { }

Answer 2

在扩展AbstractJavaSamplerClient的自定义java采样器中，您可以访问JavaSamplerContext对象，该对象公开了一组运行时属性

@Override
public SampleResult runTest(JavaSamplerContext context) {
    ...
    // get parameters:
    String urlString = context.getParameter( "paramName" );
    ...
}

您可以在运行时从JMeterContextService获取线程信息。当前活动线程数为

JMeterContextService.getNumberOfThreads()