最后，在研究了jmeter源代码之后，我发现除了我在做什么之外，我还需要显式设置guiClass和testClass参数。
testPlan.setProperty（TestElement.TEST_CLASS，TestPlan.class.getName（））; testPlan.setProperty（TestElement.GUI_CLASS，TestPlanGui.class.getName（））;
类似地，对于其他测试元素，例如ThreadGroup，JavaSampler等。
完整的代码如下，
package com.test;
import java.io.FileOutputStream;
import org.apache.jmeter.control.LoopController;
import org.apache.jmeter.control.gui.LoopControlPanel;
import org.apache.jmeter.control.gui.TestPlanGui;
import org.apache.jmeter.protocol.java.control.gui.JavaTestSamplerGui;
import org.apache.jmeter.protocol.java.sampler.JavaSampler;
import org.apache.jmeter.save.SaveService;
import org.apache.jmeter.testelement.TestElement;
import org.apache.jmeter.testelement.TestPlan;
import org.apache.jmeter.threads.ThreadGroup;
import org.apache.jmeter.threads.gui.ThreadGroupGui;
import org.apache.jmeter.util.JMeterUtils;
import org.apache.jorphan.collections.HashTree;
public class JMXCreator {
public static void main(String[] argv) throws Exception {
// Initialize the configuration variables
String jmeterHome = "D:\\apache-jmeter-2.11";
JMeterUtils.setJMeterHome(jmeterHome);
JMeterUtils.loadJMeterProperties(JMeterUtils.getJMeterBinDir()
+ "\\jmeter.properties");
JMeterUtils.initLogging();
JMeterUtils.initLocale();
// TestPlan
TestPlan testPlan = new TestPlan();
testPlan.setName("Test Plan");
testPlan.setEnabled(true);
testPlan.setProperty(TestElement.TEST_CLASS, TestPlan.class.getName());
testPlan.setProperty(TestElement.GUI_CLASS, TestPlanGui.class.getName());
// ThreadGroup controller
LoopController loopController = new LoopController();
loopController.setEnabled(true);
loopController.setLoops(5);
loopController.setProperty(TestElement.TEST_CLASS,
LoopController.class.getName());
loopController.setProperty(TestElement.GUI_CLASS,
LoopControlPanel.class.getName());
// ThreadGroup
ThreadGroup threadGroup = new ThreadGroup();
threadGroup.setName("Thread Group");
threadGroup.setEnabled(true);
threadGroup.setSamplerController(loopController);
threadGroup.setNumThreads(5);
threadGroup.setRampUp(10);
threadGroup.setProperty(TestElement.TEST_CLASS,
ThreadGroup.class.getName());
threadGroup.setProperty(TestElement.GUI_CLASS,
ThreadGroupGui.class.getName());
// JavaSampler
JavaSampler javaSampler = new JavaSampler();
javaSampler.setClassname("my.example.sampler");
javaSampler.setEnabled(true);
javaSampler.setProperty(TestElement.TEST_CLASS,
JavaSampler.class.getName());
javaSampler.setProperty(TestElement.GUI_CLASS,
JavaTestSamplerGui.class.getName());
// Create TestPlan hash tree
HashTree testPlanHashTree = new HashTree();
testPlanHashTree.add(testPlan);
// Add ThreadGroup to TestPlan hash tree
HashTree threadGroupHashTree = new HashTree();
threadGroupHashTree = testPlanHashTree.add(testPlan, threadGroup);
// Add Java Sampler to ThreadGroup hash tree
HashTree javaSamplerHashTree = new HashTree();
javaSamplerHashTree = threadGroupHashTree.add(javaSampler);
// Save to jmx file
SaveService.saveTree(testPlanHashTree, new FileOutputStream(
"d:\\test.jmx"));
}
}
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