Reading JSON object from txt file in Groovy - grails

Question

I am trying to collect a JSON from a txt file. But my below code seems to keep giving me "nullPointerException".
File f = new File(tempDir+File.separator+'jsonObject.txt')
if (f){
log.error " file exists $f"
FileReader f2 = new FileReader(f);
log.error " file data- $f2"
if (f2 == null) {
//do something
} else {
JsonSlurper jsonParser = new JsonSlurper();
game = jsonParser.parse(new FileReader(f));
}
}
SOLUTION FOUND
Reading a json txt file:
File f = new File(tempDir+File.separator+'jsonObject.txt')
def slurper = new JsonSlurper()
def jsonText = f.getText()
json = slurper.parseText( jsonText )
Writing json to a file:
File g = new File(tempDir+File.separator+'jsonObject.txt')
g.createNewFile()
def json = new JsonBuilder()
json {
"result" result
}
g.setText(json.toString())

Answer 1

Please, try this:
import groovy.json.JsonSlurper
def inputFile = new File("D:\\yourPath\\json.txt")
def InputJSON = new JsonSlurper().parseText(inputFile.text)
InputJSON.each{ println it }

Answer 2

try:
File f = new File( tempDir, 'jsonObject.txt' )
if( f.exists() ) {
def game = f.withReader { r ->
new JsonSlurper().parse( r )
}
println game
}

Answer 3

Try simple and optimized solution:
import groovy.json.JsonSlurper
try {
File inputFile = new File("your_file_path")
def slurper = new JsonSlurper()
def data = slurper.parse(inputFile)
} catch (Exception e) {
e.printStackTrace()
}

Answer 4

parseFile can take a file as an input:
import groovy.json.JsonSlurper
def inputFile = new File("/your/path/my.json")
def InputJSON = new JsonSlurper().parseFile(inputFile, 'UTF-8')
InputJSON.each{ println it }