JAVA - 【JSON】Gson & fastjson

解析JSON

• Gson：    Java Bean             => JSON String
• fastjson：解析JSON String

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1> jar包獲取

• fastjson-1.2.68.jar
• gson-2.8.6.jar

https://download.csdn.net/download/qq_42292831/12438540

2> 測試

• Market對象

Market m1 = new Market();

Book book1 = new Book("《時間簡史》",89.9);
Book book2 = new Book("《大學物理》",35.5);

List<Book> books = new ArrayList<>();

books.add(book1);
books.add(book2);

m1.setBooks(books);

List<Market> markets = new ArrayList<>();
for(int i=0;i<2;i++){
	markets.add(m1);
}

•  GSON將bean轉換爲JSON串

//GSON將bean轉換爲JSON串
//Gson gson = new Gson();
Gson gson = new GsonBuilder().setPrettyPrinting().create();
String json = gson.toJson(markets);

•  fastjson解析JSON串

//fastjson解析JSON串
//JSONArray
//JSONObject
JSONArray objs = JSON.parseArray(json);

for(int i=0;i<objs.size();i++){
	JSONObject marketsA = objs.getJSONObject(i);
	JSONArray booksA = marketsA.getJSONArray("Books");
	for(int j=0;j<booksA.size();j++){
		JSONObject bookA = booksA.getJSONObject(j);
		System.out.println(bookA.get("name"));
		System.out.println(bookA.get("price"));
	}
}