1.JSON Extractor
- Extractor Json postprocessor for use in the format of the HTTP request returns the Json for obtaining a value returned by Json. And save it as a variable for subsequent requests will be or calls such assertions.
- Names Variable : variable name stored later with reference $ {Variable names}
- Path Expressions JSON : the previous step through debugging json path expression
- Numbers Match : matching digits (0 represents a random, 1 for the first, -1 for all)
- Values the Default : The default value can not be found, usually set to NOT FOUND
- Var concatenation Compute (suffix_ALL) : whether to count all values saved all upcoming matches to be known as "variable name _ALL", usage scenarios need to get multiple values are behind the need for the operation of this set of data
- Json Path expression of use
| JsonPath |
description |
| $ |
Root |
| @ |
The current node |
| .or[] |
Child node |
| .. |
Select all eligible node |
| * |
All nodes |
| [] |
Iterator mark, such as an array subscript |
| [,] |
Support iterator do multiple choice |
| [start:end:step] |
Array slice operator |
| ?() |
Support filtering |
| () |
Support for expression evaluation |
2. Regular Expressions
- Reference name : variable name their own definition, the subsequent request will be a reference to the variable name, such as filling that: the JWT, the latter reference is $ {JWT}
- Regular Expressions : Extract the contents of the regular expression, the equivalent of the correlation function loadrunner
- "()" In square brackets is the need to extract, for you need to mention the contents enclosed in parentheses
- . "" Match any character except newline
- "*" (贪婪) 重复零次或更多
- 例如"aaaaaaaa" 匹配字符串中所有的a 正则： "a*" 会出到所有的字符"a"
- "+" (懒惰) 重复一次或更多次
- 例如"aaaaaaaa" 匹配字符串中所有的a 正则： "a+" 会取到字符中所有的a字符， "a+"与"a*"不同在于"+"至少是一次而"*" 可以是0次
- "?" (占有) 重复零次或一次
- 例如"aaaaaaaa" 匹配字符串中的a 正则 ： "a?" 只会匹配一次，也就是结果只是单个字符a
- "*?" 重复任意次，但尽可能少重复
- 例如 "acbacb" 正则 "a.*?b" 只会取到第一个"acb" 原本可以全部取到但加了限定符后，只会匹配尽可能少的字符 ，而"acbacb"最少字符的结果就是"acb"
- "+?" 重复1次或更多次，但尽可能少重复，与"*?" 一样，只是至少要重复1次
- 还有分组的情况，常用的就这两种，其它的可以再自行百度
- "(?=exp)" 匹配exp前面的位置
- "(?<=exp)" 匹配exp后面的位置
- 模板：用$$引用起来，如果在正则表达式中有多个正则表达式（多个括号括起来的），则可以是$2$，$3$等等，表示解析到的第几个值给actionId。例如：$1$表示匹配到的第一个值
- 匹配数字：0代表随机取值，1代表所有值，此时提取结果是一个数组，其余正整数代表第几个匹配的内容提取出来。如果匹配数字选择的是1
- 缺省值：正则匹配失败时，取的值
- 想要知道正则表达式是否正确，可以在请求后加入调试取样器（右键-添加-取样器-调试取样器debug sampler）
- 没有特殊的情况用（.*?）就可以解决所有问题
