Распарсить json из файла.

Adress

package com.company.JSON;

class Adress {
	private String country;
	private String city;
	private String street;
	
	public String toString(){
		return country  +" "+ city +" "+street;
		
	}

}

console

JSON прочтённый из файла:
{
    "name": "Vsevolod",
    "surname": "Ievgiienko",
    "phones": ["044-256-78-90", "066-123-45-67"],
    "sites": ["http://site1.com", "http://site2.com"],
    "address": {
         "country": "UA",
         "city": "Kyiv",
         "street": "abcd"
    }
}

Результат:
Vsevolod Ievgiienko 044-256-78-90 066-123-45-67  http://site1.com http://site2.com  UA Kyiv abcd

LoadJSON

package com.company.JSON;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;

class LoadJSON {

    public static String load (String path) throws FileNotFoundException, IOException{
    	byte[] buf;
    	
    	try (RandomAccessFile f = new RandomAccessFile(path, "r")){
    		buf = new byte[(int)f.length()];
            f.read(buf);
    	};
    	
    	System.out.println("JSON прочтённый из файла:" + "\n" + new String(buf));
        
        return new String(buf);
    }
    
	

}

Main

package com.company.JSON;

import java.io.FileNotFoundException;
import java.io.IOException;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;

// Распарсить json из файла.

public class Main {
	public static void main (String[] args) throws FileNotFoundException, IOException{
		String result = null;
		
		result = LoadJSON.load("d:\\1\\json.txt");
				
		Gson gson = new GsonBuilder().create();
        Person person = gson.fromJson(result, Person.class);

        person.printJSON("Результат:");
		
	}

}

Person

package com.company.JSON;

class Person {
	private String name;
	private String surname;
	private String [] phones;
	private String [] sites;
	private Adress address;
	
	
	public void printJSON (String text){
		System.out.println( text + "\n" + name +" "+ surname +" "+ getString (phones) +" "+ getString (sites) +" "+address);
		
	}
	
	public StringBuilder getString (String[] str){
		StringBuilder sb = new StringBuilder();
		for(String s: str)
			sb.append(s + " ");
		return sb;
		
	}
	
	
}