/**
 * This class is used to create a tree structure of objects. Each element in the
 * tree is also a key to the next node down in the tree. It provides many ways
 * to add objects and branches, as well as many ways to retrieve.
 * <p>
 * HashTree implements the Map interface for convenience reasons. The main
 * difference between a Map and a HashTree is that the HashTree organizes the
 * data into a recursive tree structure, and provides the means to manipulate
 * that structure.
 * <p>
 * Of special interest is the {@link #traverse(HashTreeTraverser)} method, which
 * provides an expedient way to traverse any HashTree by implementing the
 * {@link HashTreeTraverser} interface in order to perform some operation on the
 * tree, or to extract information from the tree.
 *
 * @see HashTreeTraverser
 * @see SearchByClass
 */
public class HashTree implements Serializable, Map<Object, HashTree>, Cloneable {
}

//ListedHashTree是HashTree的繼承類，可以保證HashTree的順序性
HashTree tree = new ListedHashTree();
//TestPlan對(duì)象，測(cè)試計(jì)劃
TestPlan plan = new TestPlan();
//ThreadGroup對(duì)象，線程組
ThreadGroup group = new ThreadGroup();
//創(chuàng)建線程組數(shù)結(jié)構(gòu)的對(duì)象groupTree
HashTree groupTree = new ListedHashTree();
//表示取樣器中的HTTP請(qǐng)求
HTTPSamplerProxy sampler = new HTTPSamplerProxy();
//創(chuàng)建HTTP請(qǐng)求的數(shù)結(jié)構(gòu)對(duì)象samplerTree
//調(diào)用put方法相當(dāng)于在plan（測(cè)試計(jì)劃）菜單對(duì)象下添加group（線程組）子菜單，這樣就形成了一種樹(shù)型結(jié)構(gòu)
HashTree samplerTree = new ListedHashTree();
samplerTree.put(sampler,new ListedHashTree())
//groupTree樹(shù)結(jié)構(gòu)添加子樹(shù)samplerTree
groupTree.put(group,samplerTree)
//tree樹(shù)結(jié)構(gòu)為測(cè)試計(jì)劃對(duì)象，添加子樹(shù)groupTree，這樣就形成了上圖的層級(jí)形式
tree.put(plan, groupTree)
//調(diào)用add方法相當(dāng)于在tree菜單對(duì)象下添加同級(jí)菜單
tree.add(Object key)

<!-- https://mvnrepository.com/artifact/com.thoughtworks.xstream/xstream -->
<dependency>
    <groupId>com.thoughtworks.xstream</groupId>
    <artifactId>xstream</artifactId>
    <version>1.4.15</version>
</dependency>

        <dependency>
            <groupId>org.apache.jmeter</groupId>
            <artifactId>ApacheJMeter_http</artifactId>
            <version>${jmeter.version}</version>
            <exclusions>
                <exclusion>
                    <groupId>org.apache.logging.log4j</groupId>
                    <artifactId>log4j-slf4j-impl</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.apache.jmeter</groupId>
            <artifactId>ApacheJMeter_functions</artifactId>
            <version>${jmeter.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.jmeter</groupId>
            <artifactId>ApacheJMeter_jdbc</artifactId>
            <version>${jmeter.version}</version>
        </dependency>

        <dependency>
            <groupId>org.apache.jmeter</groupId>
            <artifactId>ApacheJMeter_tcp</artifactId>
            <version>${jmeter.version}</version>
        </dependency>

public static ThreadGroup threadGroup;
//創(chuàng)建一個(gè)標(biāo)準(zhǔn)的線程組
private static void initThreadGroup(){
    LoopController loopController = new LoopController();
    loopController.setName("LoopController");
    loopController.setProperty(TestElement.TEST_CLASS, LoopController.class.getName());
    loopController.setProperty(TestElement.GUI_CLASS, JMeterUtil.readSaveProperties("LoopControlPanel"));
    loopController.setEnabled(true);
    loopController.setLoops(1);
    ThreadGroup group = new ThreadGroup();
    group.setEnabled(true);
    group.setName("ThreadGroup");
    group.setProperty(TestElement.TEST_CLASS, JMeterUtil.readSaveProperties("ThreadGroup"));
    group.setProperty(TestElement.GUI_CLASS, JMeterUtil.readSaveProperties("ThreadGroupGui"));
    group.setProperty(ThreadGroup.ON_SAMPLE_ERROR,"continue");
    group.setProperty(ThreadGroup.IS_SAME_USER_ON_NEXT_ITERATION,true);
    group.setProperty(TestElement.COMMENTS,"");
    group.setNumThreads(1);
    group.setRampUp(1);
    group.setDelay(0);
    group.setDuration(0);
    group.setProperty(ThreadGroup.ON_SAMPLE_ERROR, ThreadGroup.ON_SAMPLE_ERROR_CONTINUE);
    group.setScheduler(false);
    group.setSamplerController(loopController);
    threadGroup = group;
}

public static ThreadGroup threadGroup;
//創(chuàng)建一個(gè)標(biāo)準(zhǔn)的線程組
private static void initThreadGroup(){
    LoopController loopController = new LoopController();
    loopController.setName("LoopController");
    loopController.setProperty(TestElement.TEST_CLASS, LoopController.class.getName());
    loopController.setProperty(TestElement.GUI_CLASS, JMeterUtil.readSaveProperties("LoopControlPanel"));
    loopController.setEnabled(true);
    loopController.setLoops(1);
    ThreadGroup group = new ThreadGroup();
    group.setEnabled(true);
    group.setName("ThreadGroup");
    group.setProperty(TestElement.TEST_CLASS, JMeterUtil.readSaveProperties("ThreadGroup"));
    group.setProperty(TestElement.GUI_CLASS, JMeterUtil.readSaveProperties("ThreadGroupGui"));
    group.setProperty(ThreadGroup.ON_SAMPLE_ERROR,"continue");
    group.setProperty(ThreadGroup.IS_SAME_USER_ON_NEXT_ITERATION,true);
    group.setProperty(TestElement.COMMENTS,"");
    group.setNumThreads(1);
    group.setRampUp(1);
    group.setDelay(0);
    group.setDuration(0);
    group.setProperty(ThreadGroup.ON_SAMPLE_ERROR, ThreadGroup.ON_SAMPLE_ERROR_CONTINUE);
    group.setScheduler(false);
    group.setSamplerController(loopController);
    threadGroup = group;
}

public static TestPlan testPlan;
//創(chuàng)建一個(gè)標(biāo)準(zhǔn)的測(cè)試計(jì)劃
private static void initTestPlan() {
    TestPlan plan = new TestPlan();
    //設(shè)置測(cè)試計(jì)劃屬性及內(nèi)容，最后都會(huì)轉(zhuǎn)為xml標(biāo)簽的屬性及內(nèi)容
    plan.setProperty(TestElement.NAME, "測(cè)試計(jì)劃");
    plan.setProperty(TestElement.TEST_CLASS, JMeterUtil.readSaveProperties("TestPlan"));
    plan.setProperty(TestElement.GUI_CLASS, JMeterUtil.readSaveProperties("TestPlanGui"));
    plan.setEnabled(true);
    plan.setComment("");
    plan.setFunctionalMode(false);
    plan.setTearDownOnShutdown(true);
    plan.setSerialized(false);
    plan.setProperty("TestPlan.user_define_classpath","");
    plan.setProperty("TestPlan.user_defined_variables","");
    plan.setUserDefinedVariables(new Arguments());
    testPlan = plan;
}

//先創(chuàng)建一個(gè)測(cè)試計(jì)劃hashtree對(duì)象
HashTree hashTree = new ListedHashTree();
//在創(chuàng)建一個(gè)線程組threaddGroupTree對(duì)象
HashTree threadGroupTree = new ListedHashTree();
//HttpRequestConfig為HTTP對(duì)應(yīng)的請(qǐng)求頭、請(qǐng)求體等信息數(shù)據(jù)，傳入httpToHashTree靜態(tài)方法獲取到取樣器的HashTree數(shù)據(jù)結(jié)構(gòu)，源碼上圖已分享
HashTree httpConfigTree = XXClass.httpToHashTree(HttpRequestConfig httpRequestData)
//threadGroupTree添加子菜單httpConfigTree對(duì)象
threadGroupTree.put(group, httpConfigTree);
//測(cè)試計(jì)劃hashTree添加子菜單threadGroupTree對(duì)象
hashTree.put(JMeterTestPlanConfigService.testPlan, threadGroupTree);

private void hashTreeToXML(HashTree hashTree,PressureConfigInfo configInfo){
    FileOutputStream outStream = null;
    File file = new File("temp.jmx");
    File tempFile = null;
    try {
    	//創(chuàng)建一個(gè)臨時(shí)的saveservice.properties文件
        tempFile = new File("saveservice.properties");
        InputStream is = JMeterUtil.class.getResource("/jmeter/saveservice.properties").openStream();
        //將配置文件寫(xiě)入臨時(shí)文件中
        FileUtil.writeFromStream(is,tempFile);
        outStream = new FileOutputStream(file);
        //調(diào)用saveTree成功轉(zhuǎn)為xml
        SaveService.saveTree(hashTree,outStream);
        String xmlContent = FileUtil.readUtf8String(file);
        configInfo.setFile(xmlContent.getBytes());
    } catch (IOException e) {
        e.printStackTrace();
    }finally {
        try {
            FileUtils.forceDelete(file);
            FileUtils.forceDelete(tempFile);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}