java 中如何使用 json 和jsonArray

https://yunpan.cn/cxbmxzW9zVg3f  访问密码 ccf9

这是java使用json所用到的相关jar包

JSONObject json=new JSONObject(); 

是定义 实例化 json

JSONArray jsonArray = new JSONArray();

是定义实例化json数组

 json是以大括号开始：{}

json.put(key,value);

添加数据 

json数组是以中括号开始：[]

jsonArray.add(json);  

添加数据

json格式

{ "firstName": "Frank", "lastName": "Peretti", "genre": "christian fiction" }

json数组格式

[

{ "firstName": "Isaac", "lastName": "Asimov", "genre": "science fiction" },

{ "firstName": "Tad", "lastName": "Williams", "genre": "fantasy" },

{ "firstName": "Frank", "lastName": "Peretti", "genre": "christian fiction" }

]

组合格式

{ "programmers": [

{ "firstName": "Brett", "lastName":"McLaughlin", "email": "aaaa" },

{ "firstName": "Jason", "lastName":"Hunter", "email": "bbbb" },

{ "firstName": "Elliotte", "lastName":"Harold", "email": "cccc" }

],

"authors": [

{ "firstName": "Isaac", "lastName": "Asimov", "genre": "science fiction" },

{ "firstName": "Tad", "lastName": "Williams", "genre": "fantasy" },

{ "firstName": "Frank", "lastName": "Peretti", "genre": "christian fiction" }

],

"musicians": [

{ "firstName": "Eric", "lastName": "Clapton", "instrument": "guitar" },

{ "firstName": "Sergei", "lastName": "Rachmaninoff", "instrument": "piano" }

] }