JMeter Beanshell Postprocessor : Reading a file - jmeter

Question

I am using the below script in a Beanshell Postprocessor
import java.io.*;
File f =new File ("C:\Users\xxxxx\Desktop\testresults.csv");
FileWriter fw=new FileWriter(f,true);
BufferedWriter bw=new BufferedWriter(fw);
var r=prev.getResponseCode();
if (r.equals("200"))
{
bw.write("Test Passed");
}
else
{
bw.write("Test failed");
}
bw.close();
fw.close();
But I am getting the below error
BeanShellInterpreter: Error invoking bsh method: eval Sourced file: inline evaluation of: ``import java.io.*; File f =new File ("C:\Users\xxxxx\Desktop\testresults.csv") . . . '' Token Parsing Error: Lexical error at line 2, column 23. Encountered: "U" (85), after : ""C:\".
What could cause the above error.

Answer 1

You need to escape a backslash with a backslash like:
C:\\Users\\xxxxx\\Desktop\\testresults.csv
or use a forward slash instead:
C:/Users/xxxxx/Desktop/testresults.csv
A couple more hints:
Since JMeter 3.1 you should be using JSR223 Test Elements and Groovy language for scripting
If you run your test with 2 or more concurrent threads they will be writing into the same file resulting in data corruption due to a race condition so maybe it worth considering switching to Flexible File Writer instead

Answer 2

Change to JSR223 Post Processor and write as one line (groovy default)
new File("C:\\Users\\xxxx\\Desktop\\\testresults.csv") << (prev.getResponseCode().equals("200") ? "Test Passed" : "Test failed")