Use request value from list of values in JMeter

问题

I'm sure I've already done this in the past but somehow I cannot figure out how ;-) So, here's my problem:

I'm trying to create a JUnit test plan in which a HTTP request is modified each iteration by altering a specific parameter. So, for example in five iterations I want the following HTTP requests to be made:

http://localhost:8080/test/foo.html?id=1
http://localhost:8080/test/foo.html?id=2
http://localhost:8080/test/foo.html?id=3
http://localhost:8080/test/foo.html?id=4
...

I want to configure the identifier values globally for the test plan and use them within the HTTP request samplerer like this:

Path: /test/foo.html?id=${categoryId}

The question now: How do I configure the identifiers values globally (I do not want to use StringFromFile) and how do I reference them in the sampler?

回答1:

There are several ways you can do this.

If you're only incrementing, you can use a counter element
You can use any number of functions to calculate the value
You can read from a CSV file, which is the same effect as "StringFromFile" but easier to customize and manipulate

Given you have an array of values you could:

Try the pre-processor "User Parameters", creating one entry for each user/loop
Use a Beanshell script to create the array, select one at random and populate your variable

You reference them exactly as you have listed: ${varName}

回答2:

Concerning implementing ${__StringFromArrayAtRandomIndex('3', '2', '54', '42')}.

Suppose you can easily implement your scenario using e.g. BeanShell Sampler / BeanShell PostProcessor with a bit of code.

E.g.:

Set your source variable (via e.g. User Defined Variables):
```
Name        Value          
categories  3,2,54,42,37
```
(i.e. use comma as delimiter, no spaces before and after comma).

Use add BeanShell Sampler/PostProcessor with the following code:

import java.util.Random;

String[] categories = (vars.get("categories")).split(",");

int idx = new Random().nextInt(categories.length);
String category = (categories[idx]);

vars.put("categoryId", category);

Refer further in the script randomly picked form list value as ${categoryId}.

回答3:

To obtain a random variable value from a list, first declare as User variables the list or available values, with a prefix and a incremental index:

country_1     Spain 
country_2     France  
country_3     Portugal  
country_4     Italy 
country_5     England

Then you can obtain a random value from the list concatenating the prefix with a random index in the interval:

${__V(country_${__Random(1,6,)})}  --> "Spain", "France", "Portugal", etc...

Take a look to this answer for complete explanation.

回答4:

The Simplest solution without variables can be done using vars.getIteration():

/test/foo.html?id=${__groovy(vars.getIteration())}

来源：https://stackoverflow.com/questions/6341600/use-request-value-from-list-of-values-in-jmeter

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java

testing

jmeter

web-testing