Convert JSON File to String in Java

In Java, we can easily convert JSON files to strings. Converting a JSON file into a string is done by reading bytes of data of that file.

In order to convert JSON files to string, we use the nio (non-blocking I/O) package(collection of Java programming language APIs that offer features for intensive I/O operations).

Suppose, we have a Sample.json file in the system that contains the following data:

{
  "Name" : "Donal",
  "Mobile" : 89346724,
  "Boolean" : true,
  "Pets" : ["Dog", "cat"],
  "Address" : {
    "Permanent address" : "INDIA",
	"current Address" : "AMERICA"
  }
}

We use the following steps to convert JSON data into a string:

Import all the required classes such as Files, Paths, and Scanner.
Take input from the user for the location and name.
Create convertFileIntoString()
In the convertFileIntoString() method, we use the get() method of the Paths class to get the file data.
We use the readAllBytes() method of the Files class to read bytes data of the JSON files as a string.
We store the returned result of the readAllBytes()and get()methods into a variable and return it to the main() method.
In the main() method, we simply print the returned result of the convertFileIntoString()

Now, we convert or access data of the Sample.json file by using the above-discussed steps:

ReadFileAsString.java

// import required classes and packages 
packagejavaTpoint.javacodes;
// we use classes of nio package to read bytes data of the JSON file
importjava.nio.file.Files;
importjava.nio.file.Paths;
importjava.util.Scanner;
// create ReadFileAsString class to convert json file into string
public class ReadFileAsString {
	// main() method start
public static void main(String[] args) throws Exception {	//handle exception
	// declare fileName, location, and file variable that will store the user entered file name, location, and file data as a string, respectively 
	String fileName, file, location;
	// create scanner class object
	Scanner sc = new Scanner(System.in);  
System.out.print("Enter the name of the file which you want to convert or access as string: ");  
        // take input from user and initialize filName variable 
fileName = sc.nextLine();  
System.out.print("Enter the laction of the "+fileName+" file: ");  
        // take input from user and initialize location variable 
location = sc.nextLine();  
        // close scanner class obj
sc.close();
        // call convertFileIntoString() method that will return the file data as string. We store the returned data into file variable
file = convertFileIntoString(location+"\\"+fileName);
        // print the result, i.e., JSON data in form of string
System.out.println(file);
    }
    // create convertFileIntoString() method to convert JSON file into string 
public static String convertFileIntoString(String file)throws Exception
    {
	// declare a variable in which we store the JSON data as a string and return it to the main() method
	String result;
	// initialize result variable
	// we use the get() method of Paths to get the file data
	// we use readAllBytes() method of Files to read byted data from the files
	result = new String(Files.readAllBytes(Paths.get(file)));
	// return result to the main() method
	return result;
    }
}