CSDN salary increase technology - learn about the use of several common logic controllers of JMeter

Preface ：

jmeter Logics are the necessary knowledge for every test bird , Here are a few commonly used .

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1、 Simple controller  

　　 effect ： Used to combine sampler and other logic controllers

　1.1 Create a simple controller , route ： Thread group --> add to --> Logic controller --> Simple controller

　　

 　　1.2 After adding the controller , A sampler can be added to the controller HTTP request , There will be no interaction between the added requests

　　1.3 Run the simple controller , After running, you can see , Each added HTTP Request to run from top to bottom

 

 2、 Random controller

　　 effect ： As the name suggests, it is under this controller HTTP Randomly choose one of the requests HTTP Request to run

　　2.1  Create a random controller , route ： Thread group --> add to --> Logic controller --> Random controller

　　2.2 Add several under the controller HTTP request , And run , Running results ： All under the controller HTTP Requests are running , But the order is not top-down , It's random

 　　2.3 Other controllers are included under the random controller , Uncheck 【 Ignore sub controller blocks 】, If it comes to the controller randomly , Will execute the entire controller

　　2.4  Other controllers are included under the random controller , Check 【 Ignore sub controller blocks 】, If it comes to the controller randomly , Only one request under the sub controller will be executed

3、 Random sequence controller

  effect ： Similar to simple controller , The sampler request under each child node will be executed once , But the execution is random

　　3.1 Create a random controller , route ： Thread group --> add to --> Logic controller --> Random controller

　　3.2 Add several under the controller HTTP request , And run , Running results ： Only one of these requests was run

4、 Only once the controller

  effect ： In a multithreaded loop , The sampler request under its child nodes will be run only once

　　4.1 Create a controller only once , route ： Thread group --> add to --> Logic controller --> Only once the controller

　　4.2 Add several under the controller HTTP request , And run

　　4.2.1 Number of threads 1, loop 1： Each request under the controller runs only once

　　4.2.2 Number of threads 5, loop 1： Each request under the controller executes 5 Time

　　4.2.3  Number of threads 1, loop 5 ： Each request under the controller runs only once

5、 Circulation controller

  effect ： The sampler request under the controller can run circularly

　　5.1 Create a loop controller , route ： Thread group --> add to --> Logic controller --> Circulation controller

　　 The thread group is set to 1, The number of cycles is 1　　

　　

 　 5.2 Set the number of cycles of the cycle controller to 3

　　 cycles (Loop Count): Enter the number of cycles in the input box , The request under the controller can run circularly

　　 forever (forever)： If this item is checked , Then the request under the controller can run all the time

　　5.3 Add several under the controller HTTP request , And run , Running results ： take http The request is executed three times in sequence , Execute once at a time （ A concurrent ）

6、Switch controller

  effect ：Switch The controller gives the Value assignment , To specify which sampler to run . There are two ways to assign values ：

• The first is numerical ,Switch The child nodes under the controller are from 0 Start counting , Determine which element to execute by specifying the value of the child node .
• The second is to specify the name of the child element directly , For example, the of the sampler Name To match . When the specified name does not exist , No elements are executed .
• When Value It's empty time , By default, the second step is executed 1 Child node element . 

　　6.1 establish Switch controller , route ： Thread group --> add to --> Logic controller -->Switch controller

　　6.2 Add several under the controller HTTP request , And run

　　6.2.1 switch value It's empty , Default execution switch The first request under the controller

 

　　6.2.2 switch value by 2, perform switch The... Under the controller 3 A request （ Because from 0 Start counting ）

　　6.2.3 switch value by 6, perform switch The... Under the controller 1 A request （ Because from 0 Start counting , Out of range , Default to the first ）

 　　

 6.2.4 switch value by demo_switch_02, perform switch The sampler under the controller is named ”demo_switch_02“ Request

7、ForEach controller

  effect ：ForEach Controllers are generally used with user-defined variables . It reads a series of related variables in user-defined variables , The sampler or controller under the controller will be executed one or more times , Read different variable values each time .

Parameters :

• Input Variable Prefix： Input variable prefix ---- Is to define the name of the user variable
• Output variable name： Output variable name ---- Function on interface value
• Start index for loop(exclusive)： The index at the beginning of the loop （ If you don't fill in here , The default from the 1 Start , without 1 The starting variable , Error will be reported during execution ）--- from X The variable of sequence number starts
• End index for loop(inclusive)： The index at the end of the loop （ When the set variable index is exceeded , Only execute to set the index of variables , No further execution ）
• Add”_”before number： Enter whether to use... In the variable name “_” Carry out interval .

　　7.1 establish ForEach controller , route ： Thread group --> add to --> Logic controller -->ForEach controller 　　

　　

　　7.2  Add user-defined variables as input parameters of the interface , Path is ： Thread group --> add to --> The configuration element --> User defined variables

　　 

 

　　7.3　 Set various parameters of the controller , And change the path of the sampler to variable form :${baby}

 

　　7.4 Running results ： Bring the set user variables into the request in turn , Three user variables are substituted into the request three times

　

8、While controller

  effect ： Run the sampler under its child nodes / controller , Until the condition is “ false ”

Condition(function or variable): Conditions （ Function or variable ）： The conditions on which the judgment is based can be filled , Refer to the usage , Possible conditional values are ：

　　①. blank ： The last example exits the loop when the loop fails

　　②. Last value ： The last example exits the loop when the loop fails . If the last example before is just a loop failure , Don't go into the cycle .

　　③. otherwise ： Exit time ( Or no input ) The loop condition is equal to the string “  false  ”

The condition can be any variable or function , Finally equal to string ”  false  ”. It should be noted that ： The condition is to evaluate twice , Before one sampling , One random sampling

　　8.1 establish While controller , route ： Thread group --> add to --> Logic controller -->While controller

　　

　　8.2  Do not fill in while Conditional value

·　　

 　　　　8.2.1 The first request failed , Running results ： The first request failed , Subsequent requests continue to be executed and the cycle execution is not broken

　　　　

　　　　8.2.2 Intermediate request execution failed , Running results ： Intermediate request execution failed , Subsequent requests continue to be executed and the cycle execution is not broken

　　

·　　　　8.2.3 The last request failed , Running results ： The last request failed , Subsequent requests are no longer executed circularly

　　

　　8.3  while The condition value is LAST

　　

　　　　8.3.1 While The last sampler under the controller failed to execute , Out of the loop

　　　　

　　　　8.3.2  While The previous example of the controller failed to execute , Will not enter While Loop through the following child nodes

　　　　

9、Runtime controller

　　  effect ： Control operation once runtime Time of all samplers under the controller

　　9.1 establish Runtime controller , Setup time 6 second , route ： Thread group --> add to --> Logic controller -->Runtime controller

　　9.2 Add several under the controller HTTP request , And run , Running results ：

10、 If （If） controller

  effect ： According to the value of the given expression, decide whether to execute the child node under the node , By default javascript The grammar of .

Parameters ：

• Conditions （ Default JavaScript）（Expression）: Use JavaScript Function or variable to evaluate whether the condition is true or false
• A condition is interpreted as a variable expression （interpret condition as variable expression）: If this item is checked , It will be expression Evaluate the variable expression in , And with “ture” or “false” Compare , Without having to use JavaScript----- Such as _groovy function
• Execute on all sub conditions （evaluate for all children）: If this item is checked , Then the controller performs expression judgment once before each child node executes ;
• By default , The controller can execute all the runnable elements contained below it , But only once at the entrance

　　10.1 establish Runtime controller , route ： Thread group --> add to --> Logic controller -->Runtime controller

　　

　　10.2 Use the function assistant to add IF Conditions , route ：Tools---> Function Assistant dialog

　　

　　 adopt 【 Choose a function 】 Find the function to use , And then in 【 Expression evaluation 】 Write the equation you need to use , Click on 【 Generate 】 You can get a complete expression

 　　

　　10.3 Copy and paste the expression generated by the function assistant into if （If） controller , Because it's string comparison , So adjust the expression to ${__groovy("${istrue}"=="1",)}

　　10.4　 add to BeanShell Sampler , Add a script vars.put("istrue","1");---- take istrue The variable is set to 1

　　vars namely JMeterVariables, operation jmeter Variable , This variable actually references JMeter Local variable container in thread （ Essentially, Map）, Common methods ：

• vars.get(String key)： from jmeter Get the value of the variable ;
• vars.put(String key,String value)： Data stored in jmeter variable ;

 　　10.5 Add one HTTP request , Running results , perform if Under the controller HTTP request

　　10.6  take BeanShell The value in the sampler is changed to 2（ That is, the controller condition is not satisfied ）, Run again , Running results ： Don't execute if Under the controller HTTP request

11、CSV Data file settings

　　11.1 Add one CSV Data files , Path is ： Thread group --> add to --> The configuration element -->CSV Data file settings

　　

　　11.2  Create a new one TXT file , Renamed as basedata.csv, Add fields and interface related data after opening , Choose to use the name to query the student interface , Specify the name of the interface input parameter 【name】

　　　　

　　11.3  CSV Data file settings ： 

　　　　1. adopt 【 file name 】 Dexter 【 Browse 】 Built before key import basedata.csv file

　　　　2. File code selection ： edit

　　　　3. The variable name is basedata.csv Values of variables in the file

　　　　4. Ignore the first line selection ：True

　　

　　11.4  add to HTTP request , Parameterize all request parameters ${xxx}, Fill in the parameter names in sequence

　　

　　11.5 Set the number of cycles in the thread group to 6, Running results ：basedata.csv Only 4 Data , Successful cycle 6 Time , The first 1、2 Duplicate data

 

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