When using jmeter for interface testing, we will inevitably encounter situations where we need to obtain test data from the context. At this time, we need to introduce variables.
define variable
- Add -> Configuration Elements -> User-Defined Variables
- Add->Configuration Components->CSV Data File Settings (see details—— Jmeter uses csv files to read test data )
use variables
How to call variables: ${variable name}
Scope of variables: Variables can be written into any field of any test component (except TestPlan).
Take the blog garden interface as an example:
Url: https://recomm.cnblogs.com/api/v2/recomm/blogpost/reco
HTTP Method: Post
Request：
{"itemId":11343866,"itemTitle":"Jmeter 01 Jmeter下载安装及入门"}
Response：
[{"itemId":"8971531","title":"使用JMeter进行压力测试","content":null,"url":"https://www.cnblogs.com/stulzq/p/8971531.html"},{"itemId":"4709031","title":"JMeter入门","content":null,"url":"http://www.cnblogs.com/s380774061/p/4709031.html"},{"itemId":"9413237","title":"Jmeter下载安装配置及使用（windows）","content":null,"url":"https://www.cnblogs.com/fanbi/p/9413237.html"},{"itemId":"5639895","title":"Jmeter使用入门","content":null,"url":"http://www.cnblogs.com/ceshisanren/p/5639895.html"},{"itemId":"7094047","title":"JMeter入门","content":null,"url":"http://www.cnblogs.com/iceb/p/7094047.html"}]
get variable from context
For example, in the above interface, we want to request again, and the request needs to be obtained from the previous response data. For example, we need the itemId and title in the response of the first request as the request for the next request
{"itemId":"8971531","title":"使用JMeter进行压力测试","content":null,"url":"https://www.cnblogs.com/stulzq/p/8971531.html"}
Then you need to use a configuration element JSON extractor.
Right-click http request->add->post processor->json extractor
JSON extractor parameter description:
| parameter | illustrate |
|---|---|
| Apply to | |
| Main sample and sub-samples | Main sample and sub-sample |
| Main sample only | main sample |
| Sub-samples only | child sample |
| JMeter Variable Name to use | variable name |
| JSON Path Expression | JSON expression (where is the value you want to get in the response data) |
| Match No.(0 or Random) | Matching number, not filling in is to get the first one that meets the conditions, 0 is random, N is the Nth one, -1 is to get all |
| Compute comcatemation var(suffix_ALL) | If many results are found, the plugin will concatenate them using ',' delimiter and store it in a variable called <variable name>_ALL |
| Default Values | The default value when no parameter value is obtained |
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