JsonReader.java

package ua.kpi.ecampus.api.service;

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

import java.io.IOException;
import java.io.InputStream;

/**
 * Read JSON data from file.
 * Created by Admin on 18.05.2016.
 */
public class JsonReader {

    private Gson gson = new GsonBuilder()
            .setFieldNamingPolicy(FieldNamingPolicy.UPPER_CAMEL_CASE).create();

    public Gson getGson() {
        return gson;
    }

    public <T> T readJson(String fileName, Class<T> inClass) {
        return gson.fromJson(readString(fileName), inClass);
    }

    public String readString(String fileName) {
        InputStream stream = getClass().getClassLoader().getResourceAsStream(fileName);
        try {
            int size = stream.available();
            byte[] buffer = new byte[size];
            int result = stream.read(buffer);
            return new String(buffer, "utf8");
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        } finally {
            try {
                if (stream != null) {
                    stream.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}