JMeter - Read Files from Directory

Question

Using Apache JMeter

First question: I was able to read one single file (containing all the data) from a directory and use its data.

However now the requirement is to have a separate file for each data point, that means I will have to put many data files in a directory and then read the files off that directory. I have a set of data files, but I do not know how to read each of the files in a loop and send it to JMeter.

Second Question: the data we are talking about here is a JSON msg, and it's indented and multi-line, how to read a multi-line file into a single input variable? Again, I had no problem when the JSON msg is a single line.

Answer 1

1. Use Beanshell Sampler to convert files list into a JMeter Variable:

   • Add a Beanshell Sampler to your test plan

   • Put the following code into the Sampler's "Script" area:

     File folder = new File("/path/to/your/folder");
     File[] files = folder.listFiles();
     int counter = 1;
     for (File file : files) {
         vars.put("file_" + counter, file.getAbsolutePath());
         counter++;
     }
     

     It will result into variables set like:

     file_1=/path/to/your/folder/file1.txt file_2=/path/to/your/folder/file2.txt etc.

2. Add ForEach Controller after Beanshell Sampler and configure it as follows:

   • Input variable prefix: file
   • Start index for loop: 0
   • End index for loop: leave blank
   • Output variable name: anything meaningful, i.e. current_file
   • Check Add "_" before number
3. Put your main sampler as a child of the ForEach Controller. Where required address each file contents using __FileToString() function as ${__FileToString(${current_file},,)}