json string [] denotes an array of objects, {} represents an object.
Object contains a number of "property": property value. Property value may be a value, or an array, or object.
JSON Extractor using json path expression matching can take a plurality of variable values. $ Root object represents the response. Attribute takes a child object or objects. Take the object with the array [] array index starts from 0.
Example:
1 to find a response result json format, response analysis results.
The following example is a response of the entire array, including four objects. Thus a value of $ [Index * take all or take 0-3] Property Value
If the response is similar to { "Properties": [{ "sx": 1}, {}, {}]}, the entire response is an object. Taking the value of sx: $ attributes [0] .sx.
2 jmeter step of adding a request analysis, and right points on the request to add post processors "JSON Extractor
A plurality of parameter names separated by semicolons, json path expression that matches the first number, the default value must be a semicolon [delimiter]
2 all have to match the number of addition [tried matchno (default value of 0), any one of the other three did not match the request is displayed in the result tree]
names of created variables: the received value of the variable name
json path: json path expression
match no: 0 random; n-value taking the first few matches; -1 Match all subsequent references of the N values taken _N variable name.
default values: default value, the matching value less than the value taken when
3 a new http request acquisition parameters
4 Add the result tree, run, view the results.
Modify json extractor Gets an array of all the values 5 $ [*]. Property. match no = 3 take the first three.
After 6 match no = 5, array bounds, take default values
7 json extractor modify settings match match no = -1 all values; http request and modify the parameters for reception parameters $ {varname_N}. N = 1-4.
8 modified json extractor, $ {varname_N} after the N is not out of range parameter [not json extractor default values in the set, because the N, P, F, D variable actual value to take]
Official website: http://jmeter.apache.org/usermanual/component_reference.html#JSON_Extractor
json path ：https://goessner.net/articles/JsonPath/
Original: https://www.cnblogs.com/dinghanhua/p/9823305.html