Read JSON

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;

import com.google.gson.Gson;

public class App {
    public static void main(String[] args) {
        System.out.println(loadJson1("data.json", true));
        System.out.println(loadJson2("data.json", true));

        String jsonStr = loadJson2("data.json", true);
        Data data = new Gson().fromJson(jsonStr, Data.class);

        // Show it.
        System.out.println(data);
    }

    public static String loadJson1(String filename, boolean relative) {
        File file = null;
        FileInputStream fis = null;
        String result = "";

        if (relative) {
            filename = "resources/" + filename;
        }

        try {
            file = new File(ClassLoader.getSystemResource(filename).toURI());
            fis = new FileInputStream(file);
            byte[] data = new byte[(int) file.length()];
            fis.read(data);
            fis.close();

            dumpData(data);

            result = new String(data, "UTF-8");
        } catch (Exception e) {
            System.err.println("Error: " + e.getMessage());
        } finally {
            try {
                fis.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        return result;
    }

    public static String loadJson2(String filename, boolean relative) {
        BufferedReader br = null;
        StringBuffer sb = new StringBuffer();

        if (relative) {
            filename = "resources/" + filename;
        }

        try {
            br = new BufferedReader(new InputStreamReader(
                    ClassLoader.getSystemResourceAsStream(filename)));

            String line = "";
            while ((line = br.readLine()) != null) {
                sb.append(line.trim());
            }
        } catch (Exception e) {
            System.err.println("Error: " + e.getMessage());
        } finally {
            try {
                br.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        return sb.toString();
    }

    private static void dumpData(byte[] data) {
        for (int i = 0; i < data.length; i++) {
            System.out.printf("%02X ", data[i]);

            if (i % 8 == 7) {
                System.out.println();
            }
        }
        System.out.println();
    }
}

import java.util.List;

public class Data {
    private String title;
    private Long id;
    private Boolean children;
    private List<Data> groups;

    public String getTitle() {
        return title;
    }

    public Long getId() {
        return id;
    }

    public Boolean getChildren() {
        return children;
    }

    public List<Data> getGroups() {
        return groups;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public void setChildren(Boolean children) {
        this.children = children;
    }

    public void setGroups(List<Data> groups) {
        this.groups = groups;
    }

    public String toString() {
        return String.format("title='%s',id=%d,children=%s,groups=%s",
            title, id, children, groups);
    }
}

/* OUTPUT:

7B 0D 0A 20 20 20 20 27
74 69 74 6C 65 27 3A 20
27 43 6F 6D 70 75 74 69
6E 67 61 6E 64 49 6E 66
6F 72 6D 61 74 69 6F 6E
73 79 73 74 65 6D 73 27
2C 0D 0A 20 20 20 20 27
69 64 27 3A 20 31 2C 0D
0A 20 20 20 20 27 63 68
69 6C 64 72 65 6E 27 3A
20 27 74 72 75 65 27 2C
0D 0A 20 20 20 20 27 67
72 6F 75 70 73 27 3A 20
5B 7B 0D 0A 20 20 20 20
20 20 20 20 27 74 69 74
6C 65 27 3A 20 27 4C 65
76 65 6C 6F 6E 65 43 49
53 27 2C 0D 0A 20 20 20
20 20 20 20 20 27 69 64
27 3A 20 32 2C 0D 0A 20
20 20 20 20 20 20 20 27
63 68 69 6C 64 72 65 6E
27 3A 20 27 74 72 75 65
27 2C 0D 0A 20 20 20 20
20 20 20 20 27 67 72 6F
75 70 73 27 3A 20 5B 7B
0D 0A 20 20 20 20 20 20
20 20 20 20 20 20 27 74
69 74 6C 65 27 3A 20 27
49 6E 74 72 6F 54 6F 43
6F 6D 70 75 74 69 6E 67
61 6E 64 49 6E 74 65 72
6E 65 74 27 2C 0D 0A 20
20 20 20 20 20 20 20 20
20 20 20 27 69 64 27 3A
20 33 2C 0D 0A 20 20 20
20 20 20 20 20 20 20 20
20 27 63 68 69 6C 64 72
65 6E 27 3A 20 27 66 61
6C 73 65 27 2C 0D 0A 20
20 20 20 20 20 20 20 20
20 20 20 27 67 72 6F 75
70 73 27 3A 20 5B 5D 0D
0A 20 20 20 20 20 20 20
20 7D 5D 0D 0A 20 20 20
20 7D 5D 0D 0A 7D
{
    'title': 'ComputingandInformationsystems',
    'id': 1,
    'children': 'true',
    'groups': [{
        'title': 'LeveloneCIS',
        'id': 2,
        'children': 'true',
        'groups': [{
            'title': 'IntroToComputingandInternet',
            'id': 3,
            'children': 'false',
            'groups': []
        }]
    }]
}
{'title': 'ComputingandInformationsystems','id': 1,'children': 'true','groups': [{'title': 'LeveloneCIS','id': 2,'children': 'true','groups': [{'title': 'IntroToComputingandInternet','id': 3,'children': 'false','groups': []}]}]}
title='ComputingandInformationsystems',id=1,children=true,groups=[title='LeveloneCIS',id=2,children=true,groups=[title='IntroToComputingandInternet',id=3,children=false,groups=[]]]

*/