JMeter jp#gc Parametrized controller - construct object from variables - jmeter

Question

How to construct an object with attributes taken only from jp#gc-Parametrized controller user defined variables list, that can be used for building dynamically xml/json data structures for HTTP Sampler later on?
Controller variables:
XML structure for HTTP request body:
Example 1:
<?xml version="1.0" encoding="UTF-8"?>
<login>
<username>someUser</username>
<password>1234</password>
</login>

Answer 1

Assuming your above Parameterized Controller setup you can refer the declared variables like:
<?xml version="1.0" encoding="UTF-8"?>
<login>
<username>${username}</username>
<password>${password}</password>
</login>
Which will result into variables substitution in the runtime with their respective values which can be checked using i..e View Results Tree listener :
Check out JMeter Parameterization - The Complete Guide article for more information on various approaches to JMeter test parameterization.

Answer 2

It's saving JMeter variables, so you can use ${} syntax
<userName>${username}</userName>
<password>${password}</password>
To get dynamically variables in XML Body use the following sample
import java.util.stream.StreamSupport;
String xmlBody="<?xml version=\"1.0\" encoding=\"UTF-8\"?><login>";
StreamSupport.stream(Spliterators.spliteratorUnknownSize(vars.getIterator(), Spliterator.ORDERED), false).forEach(
e -> xmlBody+="<" +e.getKey() + ">" +e.getValue() + "</" +e.getKey() + ">");
xmlBody += "</login>";
log.info(xmlBody);