如何从代码中的JMeter测试计划读取变量？

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。numthreads，这样我的测试代码就可以知道测试中使用了多少线程。

感谢您的回复。以下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

在扩展< code > AbstractjavaSamplerClient 的自定义Java采样器中，您可以访问< code>JavaSamplerContext对象，该对象公开了一系列运行时属性

@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。当前活动线程数是

JMeterContextService.getNumberOfThreads()

Answer 2

>

Java方式（如果您要使用JavaAPI和XPath从.jmx文件中获取值）

DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();

DocumentBuilder builder = builderFactory.newDocumentBuilder();

Document xmlDocument = builder.parse(new File("/path/to/test.jmx"));

XPath xPath = XPathFactory.newInstance().newXPath();
String expression = "//hashTree/ThreadGroup/stringProp[@name='ThreadGroup.num_threads']/text()";
NodeList matches = (NodeList) xPath.compile(expression).evaluate(xmlDocument, XPathConstants.NODESET);

for (int i = 0; i < matches.getLength(); ) {
    System.out.println("Thread Group " + (i + 1) + " users = " + matches.item(i).getTextContent());
    i++;
}

JMeter方式(如果你使用JMeter API来读取。jmx文件)

JMeterUtils.loadJMeterProperties("/path/to/jmeter.properties");
JMeterUtils.setJMeterHome("/path/to/jmeter");
JMeterUtils.initLogging();
JMeterUtils.initLocale();


SaveService.loadProperties();


StandardJMeterEngine jmeter = new StandardJMeterEngine();

HashTree testPlanTree = SaveService.loadTree(new File("/path/to/test.jmx"));

JMeterTreeModel treeModel = new JMeterTreeModel(new Object());
JMeterTreeNode root = (JMeterTreeNode) treeModel.getRoot();
treeModel.addSubTree(testPlanTree, root);

SearchByClass<ThreadGroup> threadGroups = new SearchByClass<>(ThreadGroup.class);
testPlanTree.traverse(threadGroups);
Collection<ThreadGroup> threadGroupsRes = threadGroups.getSearchResults();
for (ThreadGroup threadGroup : threadGroupsRes) {
    System.out.println(threadGroup.getProperty("ThreadGroup.num_threads"));
}