JMeter assertion failed to extract parameters in Request Body

A problem that has been plagued for a long time, I haven't found the relevant answer, share it.

For example, a scene:

POST request, import DATA using CSV parameterization, when responding to assertion,Output and save the parameter value of the request(Post Data in Request Body).

Some people see this will say: You don't have more this, eat something and spit it out.

Yes, it is better than I want to eat a date. Put it in your mouth and chew it, find it broken, spit it out, I want to see which.

So, it's not more, because this is a demand, the demand is reasonable :-)

In JMeter, there is no processor such as a regular extractor to directly extract the POST DATA method.

Therefore, you can only add a beanshell assertion, write extraction and processing methods yourself.

There are two ways to take the POST DATA:

1.prev.getsamplerdata () // Get all request body data
2.Prev.QueryString // Get only Post Data

The DATA here has been encoded by the URL (when the parameter is encoded), then the acquired POST DATA is intercepted, using the URLDECoder decoding.

Method: Urldecoder.Decode ()

If the incubation is Chinese, remember to specify the format "UTF-8", otherwise it will be garbled after decoding.

Here is something to pay attention to:

The $ {__ urldecode ()} in the function assistant is invalid in Beanshell because it is only valid for constants, and the variable is invalid.

E.g:
DATA is a variable, $ {__ urldecode (data)} decoded is invalid;
$ {__ urldecode ("data")} outputs the string DATA directly;
In the input constant, it is effective: $ {__ urldecode ("% IT% E6% 96% 87% E8% 89% BA% E9% 9D% 92% E5% B9% B4")} will decode the output correctly;

Finally, the extracted error will be saved to the specified location file:

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