How to run Java code in in beashell of jmeter and pass vairables in Jmeter script - jar

Question

Hi I am getting the following error:
2020-05-22 18:46:34,329 ERROR o.a.j.u.BeanShellInterpreter: Error invoking bsh method: eval In file: inline evaluation of: ``import java.io.File; import java.io.FileInputStream; import java.util.Base64; im . . . '' Encountered "[" at line 16, column 40.
Here is the code:
import java.io.File;
import java.io.FileInputStream;
import java.util.Base64;
String imageString = null;
String pathImageFolder = "/home/sarvesh/Desktop/sgi/10";
File file = new File(pathImageFolder);
int filecount = file.list().length;
File[] files = file.listFiles();
for (File f : files) {
f = new File(f.getPath());
FileInputStream fis = new FileInputStream(f);
byte byteArray[] = new byte[(int) f.length()];
fis.read(byteArray);
imageString = Base64.getEncoder().encodeToString(byteArray);
System.out.println("***********************************************");
System.out.println("File Path : " + f.getAbsolutePath());
System.out.println("Base 64 Image : " + imageString);
System.out.println("***********************************************");
}
How can I resolve this?

Answer 1

Be aware that staring from JMeter 3.1 you should be using JSR223 Test Elements and Groovy language for scripting therefore consider migrating to the JSR223 Sampler on next available opportunity, the equivalent code would be something like:
String pathImageFolder = "/home/sarvesh/Desktop/sgi/10";
new File(pathImageFolder).listFiles().each { file ->
imageString = file.bytes.encodeBase64().toString();
log.info("File Path :" + file.getAbsolutePath());
log.info("Base 64 Image :" + imageString);
}
Demo:
More information:
Groovy Goodness: Base64 Encoding
Apache Groovy - Why and How You Should Use It