package com.gsonUtils;

import java.io.FileNotFoundException;
import java.io.FileReader;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonIOException;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import com.google.gson.JsonSyntaxException;


public class ReadJson {
	public static void main(String[] args) {
		read();
		out();
	}
//讀取Json
	public static void read() {
		try {
			JsonParser parser = new JsonParser();
			JsonObject object = (JsonObject) parser.parse(new FileReader("in.json"));
			JsonArray array = object.get("employees").getAsJsonArray();
			for (int i = 0; i < array.size(); i++) {
				JsonObject unitobject = array.get(i).getAsJsonObject();
				System.out.println("-------------------");
				String firstName = unitobject.get("firstName").getAsString();
				String lastName = unitobject.get("lastName").getAsString();
				System.out.println("firstName:" + firstName + "\nlastName:" + lastName);
			}
			System.out.println("-------------------");
			System.out.println("num：" + object.get("num").getAsInt());
			System.out.println("boolean：" + object.get("boolean").getAsBoolean());
			System.out.println("string：" + object.get("string").getAsString());
		} catch (JsonIOException | JsonSyntaxException | FileNotFoundException e) {
			e.printStackTrace();
		}
	}
//輸出Json
	public static void out() {
		JsonObject object = new JsonObject();
		List list = new ArrayList();
		
		List employees = new ArrayList();
		Map m = new HashMap();
		m.put("firstName", "Bill");
		m.put("lastName", "Gates");
		employees.add(m);
		Map m1 = new HashMap();
		m1.put("firstName", "George");
		m1.put("lastName", "Bush");
		employees.add(m1);
		Map m2 = new HashMap();
		m2.put("firstName", "Thomas");
		m2.put("lastName", "Carter");
		employees.add(m2);
		
		Map m3 = new HashMap();
		m3.put("employees",employees );
	    m3.put("num", 1);
		m3.put("string", "String");
		m3.put("boolean", true);
		list.add(m3);
		Gson gson3 = new Gson();
		String prettyJsonStr2 = gson3.toJson(list.get(0));
		System.out.println(prettyJsonStr2);
	}
	
}