JMeter basic learning records

1、HTTP Request defaults

effect ：

1、 Request default value can set the default value of request parameters 、 request url The default value of , If there are more than one http The body of the request is consistent , Then it can be set to the default value , Prevent a large number of changes after changes http request , Can play a good reuse effect

2、 If in a single http The request adds the same parameter as the default value , Is a single http The requested parameters prevail , At this time, the default value is set to this http Invalid , The default value takes effect only when no parameters are filled in

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2、HTTP Header Manager

effect ：

You can customize the value of the header field through the header manager , For example, modify User-Agent Change the value of to another value （ The screenshot has not been changed ,Value Values can be entered by yourself ）

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3、 User defined variables

effect ：

It's going on http When asked , If the value of a parameter requires multiple tests , Then you can customize the variables , At the same time http Call the user-defined variable in the request parameter , Call mode ：${ Variable name }, such as ${date1}

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4、 Request element -- A parameterized txt

effect ：

User defined variables can be written to txt In file , By adding CSV Date Set Config Components , take txt Document import , Define variable name , Loop through the test txt Multiple lines of data in the document , This can reduce http Number of requests created

such as , There is a login interface , You will design normal login 、 Wrong user name 、 Wrong password 、 User name is empty 、 The password is empty. 、 All are empty use cases , So you can create a txt file , Write your test data in the following format

stay http Request in sampler , Get by calling variables txt Value information of , If you need to traverse txt All values in it , You can set the number of cycles to 6（ Because our data is 6 strip , Set... According to the actual situation ）, Then you can loop through txt The data in it

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5、 Request element -- A parameterized csv

effect ：

A parameterized csv Same as txt It's the same operation , Only the imported file becomes csv file （ You can create excel Save as after csv file ）,csv Is text in tabular format , For data creation and data viewing txt It is better to

6、 Parameterized function assistant _CSVRead

effect ：

By using jmeter Internal function _CSVRead Read csv File content to parameterize http Request data , Practical and parametric csv similar , It's just a function call , Finally, the variable name generated by the calling function is called

In the function dialog box in the figure below , If you want to get information about the second column and the number of subsequent columns , Then fill in the column information separately 1,2,... equivalence

By function _CSVRead Get the parameter value information , If you want to traverse all the parameters set in the file , Then set the value of the number of threads in the thread group to the actual number of parameter lines , Instead of setting the number of cycles

How to use ：

Open function assistant ：

Function Assistant dialog ：

How to call the variables generated by the function assistant ：

7、 Parameterized function assistant _randomstring

effect ：

Call this function to automatically generate random data , To some extent, you don't have to prepare the test data yourself , But this method can not guarantee the uniqueness of the data , Because the randomly generated data may be duplicated

Use the same way as csvread Function similar to , The following figure shows how to use and generate

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8、 The regular expression extractor gets the response result

effect ：

You can extract the content you want from the specified response data ： Both header and response data can be extracted

Regular expression extractors must be added under a request , As its sub request , Otherwise, the specified data cannot be extracted

How to use ：

1、 In extractor （ such as http request ） Now create a regular expression extractor , Then fill in the information of the extractor

2、 How to view the extraction results of regular expressions ：

First, add... Under the thread group Debug Sampler, After operation , View the extracted information under the view result tree

Be careful ： If one sampler needs to use the regular extractor values of other samplers , Then this sampler should be placed in front of the sampler that references it , The variables and variable values in the regular extractor can be obtained normally

Normal after position change

9、 The regular expression extractor gets an array

effect ：

Last summary （ The first 8） It only shows how to get one or more data from one data , So this is to obtain data information from multiple data

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10、 Logic controller -foreach controller

effect ：

You can traverse the values of some similar variables

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11、json path The extractor gets the response result

effect ：

The returned data is json When formatting data , have access to json Extractor to get the information in the response data

How to use ：

jsonpath grammar ：$ Represents the root path

12、jmeter Of cookie Processing mode - add to http cookie Manager

effect ：

add to cookie Information , It can guarantee the success of subsequent request operations

How to use ：

Add... In addition cookie You can also use the regular expression extractor to get cookie Information , And will cookie The information is placed in the next request header , It is possible to manually cookie Information added to cookie Manager