json
概念：javascript object notation js標(biāo)示對(duì)象的一種方式
作用：
1、標(biāo)示數(shù)據(jù)旅挤，鍵值對(duì)踢关，對(duì)象，數(shù)組
2粘茄、保存數(shù)據(jù)
3签舞、json可以作為數(shù)據(jù)交換的格式
特點(diǎn)：
輕量級(jí)，原生js
json數(shù)據(jù)
- kea/value
{"name":"zhangsan","age":"21"}
- object
{"stu":{"name":"lisi","age":"21"}}
- array
{"tea":[{"name":"lisi","age":"21"},{"name":"lisi","age":"21"}]}
json工具類
- 訪問官網(wǎng)http://www.json.org/
- 找到j(luò)ava平臺(tái)的json工具類驹闰，例如json-java
- 到github下載源碼
- 導(dǎo)入到eclipse瘪菌，導(dǎo)出jar
json-java的使用
- javabean對(duì)象轉(zhuǎn)成json對(duì)象
User user=new User("zhaoliu", "123");
JSONObject json=new JSONObject(user);//將user對(duì)象轉(zhuǎn)成json對(duì)象
- list對(duì)象轉(zhuǎn)成json對(duì)象
User user1=new User("lisi","123");
User user2=new User("zhaoliu","123");
User user3=new User("zhangsan","123");
List<User> list=new ArrayList<User>();
list.add(user1);
list.add(user2);
list.add(user3);
JSONArray json=new JSONArray(list);//將list<User>轉(zhuǎn)成json對(duì)象
