Table of contents
foreword
= interface association, the token returned by the previous interface is used as the input parameter of the next interface, in addition to the extraction with the json extractor mentioned in the previous article, it can also be extracted with regular expressions
The json extractor can only extract data in json format, and the regular pattern can match any return
1. Scenarios
I now have a login interface A, which returns a token value after successful login, and an interface B that obtains the bound card number, but interface B must log in first and then pass the login token to access
A interface login interface document basic information
Access address: http://127.0.0.1:8000/api/v1/login/ Request
type: POST
request header: application/json
Request parameters: {"username":"test", " password”:”123456”}
The request and returned message information of the A interface are as follows
D:\>http http://127.0.0.1:8000/api/v1/login/ username=test password=123456 -v
POST /api/v1/login/ HTTP/1.1
Accept: application/json, */*
Accept-Encoding: gzip, deflate
Connection: keep-alive
Content-Length: 42
Content-Type: application/json
Host: 127.0.0.1:8000
User-Agent: HTTPie/1.0.3
{
"password": "123456",
"username": "test"
}
HTTP/1.1 200 OK
Allow: POST, OPTIONS
Content-Length: 109
Content-Type: application/json
Date: Sat, 21 Sep 2019 15:37:06 GMT
Server: WSGIServer/0.2 CPython/3.6.0
Vary: Accept, Cookie
X-Frame-Options: SAMEORIGIN
{
"code": 0,
"msg": "login success!",
"token": "234af73571da46ade79ea6a74961b1d23d609b79",
"username": "test"
}
Interface B obtains the basic information of the interface document bound to the card number
Access address: http://127.0.0.1:8000/api/v1/user/info/Request
type: GET
request header: Content-Type: application/json
request header token parameter: Authorization: Token xxxxx login token xxxxx
2. Login request
First add the http request in jmeter and fill in the parameters of the login interface
The HTTP information header manager adds the post request type: Content-Type: application/json 
After running, check the number of results, and you can see that the token value we want is returned correctly
3. Regular extractor
Add Post Processor - Regular Extractor
The returned result, extract the value corresponding to the token from the result: 50c7e57363141459fab998376350ed3c3dee1baf
Regular extractor parameter description:
Response fields to check: sample data source, subject is selected by default
Reference name: the variable name (re_token) when referenced elsewhere, which can be customized
Reference method: ${reference name}
Regular expression: data extractor, the value you want to get in () brackets, such as: "token": "(.*?)"
Template: $$ corresponds to the regular expression extractor type. -1 for all, 0 for random, 1 for the first and 2 for the second, and so on, if there is only one regularity, generally fill in $1$
Matching numbers: All the results of the regular expression matching data can be regarded as an array, and the matching numbers can be regarded as the number of elements of the array - 1 means all, 0 is
random, 1 is the first, 2 is the second, and so on analogy. If only the first matching value is obtained, fill in 1
Default value: the default value when the matching fails, you can write whatever you want, or you can leave it blank, or use a null value when checking failure
4. Reference parameters
The next request refers to the token parameter above 
to view the result, and the reference is successful
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