Use Groovy To Search A File And Grab Contents Below A String - string

Question

I'm trying to use Groovy to open a file to search for a specific substring and then grab a different substring that occurs below the first one.
For example the substring I'm searching for is "Charger is enabled. Checking charge parameters..."
and if it is found I want to get a specific string that occurs after this.
Is the best way to do this read the file into memory and search for the index of the first string?

Answer 1

// With Java
import java.io.File;
import java.io.BufferedReader;
import java.io.FileReader;
def localDirectory = "";
def fileName = "";
def searchKey = "Charger is enabled. Checking charge parameters";
def searchKey2 = "";
def errorMessage = "";
FileReader fr;
BufferedReader br;
try
{
File f1 = new File(localDirectory+"/"+fileName);
fr = new FileReader(f1);
br = new BufferedReader(fr);
def keyFound = false;
// Go through line by line.
def line;
while ((line = br.readLine()) != null)
{
// If first string is found, process the second string.
if(line.contains(searchKey))
{
while ((line = br.readLine()) != null)
{
// Do something with the second string.
if(line.contains(searchKey2))
{
keyFound=true;
break;
}
}
}
if(keyFound)
{
break;
}
}
}
catch (Exception e)
{
errorMessage += "\nUnexpected Exception: " + e.getMessage();
for (trace in e.getStackTrace())
{
errorMessage += "\n\t" + trace;
}
}
finally
{
fr?.close();
br?.close();
}
// With Groovy
def localDirectory = "";
def fileName = "";
def searchKey = "Charger is enabled. Checking charge parameters";
def searchKey2 = "";
def errorMessage = "";
try
{
File f1 = new File(localDirectory+"/"+fileName);
def keyFound = false;
// Go through line by line.
def line;
f1.withReader
{
reader ->
while((line = reader.readLine()) != null)
{
// If first string is found, process the second string.
if(line.contains(searchKey))
{
while((line = reader.readLine()) != null)
{
// Do something with the second string.
if(line.contains(searchKey2))
{
keyFound=true;
break;
}
}
}
if(keyFound)
{
break;
}
}
}
}
catch (Exception e)
{
errorMessage += "\nUnexpected Exception: " + e.getMessage();
for (trace in e.getStackTrace())
{
errorMessage += "\n\t" + trace;
}
}