如何以编程方式获取HeaderManager等HttpSamplerProxy元素及其添加的标头

import org.apache.jmeter.config.Arguments;
import org.apache.jmeter.config.Header;
import org.apache.jmeter.config.HeaderManager;
import org.apache.jmeter.protocol.http.control.HeaderManager;
import org.apache.jmeter.protocol.http.sampler.HTTPSamplerProxy;
import org.apache.jmeter.testelement.TestElement;
import org.apache.jmeter.testelement.property.JMeterProperty;
import org.apache.jmeter.testelement.property.PropertyIterator;
import org.apache.jmeter.testelement.property.TestElementProperty;
import org.apache.jmeter.util.JMeterUtils;

public class JMeterHeaderManagerExample {
    public static void main(String[] args) {
        // 创建一个HeaderManager元素
        HeaderManager headerManager = new HeaderManager();
        
        // 添加一个标头
        Header header = new Header("Content-Type", "application/json");
        headerManager.add(header);
        
        // 创建一个HttpSamplerProxy元素
        HTTPSamplerProxy httpSampler = new HTTPSamplerProxy();
        httpSampler.setDomain("example.com");
        httpSampler.setPath("/api");
        
        // 将HeaderManager元素添加到HttpSamplerProxy元素中
        httpSampler.setHeaderManager(headerManager);
        
        // 获取HttpSamplerProxy元素中的HeaderManager元素
        HeaderManager retrievedHeaderManager = httpSampler.getHeaderManager();
        
        // 获取HeaderManager元素中添加的标头
        PropertyIterator iterator = retrievedHeaderManager.getHeaders().iterator();
        while (iterator.hasNext()) {
            JMeterProperty property = iterator.next();
            if (property instanceof TestElementProperty) {
                TestElement testElement = ((TestElementProperty) property).getElement();
                if (testElement instanceof Header) {
                    Header retrievedHeader = (Header) testElement;
                    String name = retrievedHeader.getName();
                    String value = retrievedHeader.getValue();
                    System.out.println("Header: " + name + " = " + value);
                }
            }
        }
    }
}