Jmeter value to variable in string - jmeter

Question

How do i replace a variable defined in a file (a.xml) after the file is read into Jmeter ?
eg. a.xml has a content.
<Shipment Action="MODIFY" OrderNo="${vOrderNo}" >
The entire file is read into a string using
str_Input=${__FileToString(/a.xml)}
In the Jmx file, a http Request is made to get output from a webservice as
Using Xpath Extractor the value of OrderNo is read into a Variable vOrderNo.
Now, wanted to use the value of variable vOrderNo in the str_Input.. ? How do i ?

Answer 1

You can easily achieve this using beanshell (~java) code from any jmeter's sampler which allows beanshell code execution - BeanShell Sampler e.g..
The following works:
import java.io.*;
try
{
// reading file into buffer
StringBuilder data = new StringBuilder();
BufferedReader in = new BufferedReader(new FileReader("d:\\test.xml"));
char[] buf = new char[1024];
int numRead = 0;
while ((numRead = in.read(buf)) != -1) {
data.append(buf, 0, numRead);
}
in.close();
// replacing stub with actual value
String vOrderNo = vars.get("vOrderNo");
String temp = data.toString().replaceAll("\\$\\{vOrderNo\\}", vOrderNo);
// writing back into file
Writer out = new BufferedWriter(new FileWriter("d:\\test.xml"));
out.write(temp);
out.close();
}
catch (Exception ex) {
IsSuccess = false;
log.error(ex.getMessage());
System.err.println(ex.getMessage());
}
catch (Throwable thex) {
System.err.println(thex.getMessage());
}
This code doesn't require read file into string via ${__FileToString(...)}.
As well, you can combine both methods.