1、从实体类到JSON字符串
Gson gson = new Gson();
String jsonBDID = gson.toJson(bdPushID);
2、从JSON字符串到实体类
Gson gson = new Gson();
BDPushID bdPushID2 = gson.fromJson(bdPushId, BDPushID.class);
3、从JSON数组到ArrayList
Gson gson = new Gson();
Car cars = gson.fromJson(result,new TypeToken<ArrayList<Car>>() {}.getType());
把对象转为JSON格式的字符串
Gson gs = new Gson();
Person person = new Person();
person.setId(1);
person.setName("我是酱油");
person.setAge(24);
String objectStr = gs.toJson(person);//把对象转为JSON格式的字符串
System.out.println("把对象转为JSON格式的字符串/// "+objectStr);
上面的代码重点是Gson对象,它提供了toJason()方法将对象转换成Json字符串,上面代码的objectStr对象值为:
{“id”:1,”name”:”我是酱油”,”age”:24}
把List转为JSON格式的字符串
Gson gs = new Gson();
List<Person> persons = new ArrayList<Person>();
for (int i = 0; i < 10; i++) {//初始化测试数据
Person ps = new Person();
ps.setId(i);
ps.setName("我是第"+i+"个");
ps.setAge(i+10);
persons.add(ps);
}
String listStr = gs.toJson(persons);//把List转为JSON格式的字符串
System.out.println("把list转为JSON格式的字符串/// "+listStr);
上面代码的listStr对象值为:
[{“id”:0,”name”:”我是第0个”,”age”:10},{“id”:1,”name”:”我是第1个”,”age”:11},{“id”:2,”name”:”我是第2个”,”age”:12},{“id”:3,”name”:”我是第3个”,”age”:13},{“id”:4,”name”:”我是第4个”,”age”:14},{“id”:5,”name”:”我是第5个”,”age”:15},{“id”:6,”name”:”我是第6个”,”age”:16},{“id”:7,”name”:”我是第7个”,”age”:17},{“id”:8,”name”:”我是第8个”,”age”:18},{“id”:9,”name”:”我是第9个”,”age”:19}]