How to add multiple values to a parameter in jMeter

Question

How can I add multiple values (these values are extracted with regex extractor) to a parameter.

I have the following test:

Using the regex extractor I get the following:

Now I'm using a BeanShell PreProcessor that contains the following code:

int count = Integer.parseInt(vars.get("articleID_matchNr"));
for(int i=1;i<=count;i++) { //regex counts are 1 based
sampler.addArgument("articleIds", "[" + vars.get("articleID_" + i) + "]");
}

Using this will generate the following request:

This will add multiple parameters with the same name (articleIds) which will cause an error when I'm running the test. The correct form of the parameter should be:

articleIds=["148437", "148720"]

The number of articleIds is different from a user to another.

Answer 1

That's totally expected as you're adding an argument per match. You need to amend your code as follows to get desired behavior:

StringBuilder sb = new StringBuilder();
sb.append("[");
int count = Integer.parseInt(vars.get("articleID_matchNr"));
for (int i = 1; i <= count; i++) {
    sb.append("\"");
    sb.append(vars.get("articleID_" + i));
    if (i < count) {
        sb.append("\", ");
    }
}
sb.append("\"]");
sampler.addArgument("articleIds", sb.toString());

See How to use BeanShell guide for more details and kind of JMeter Beanshell scripting cookbook.