使用用Gson操作Json示例

Gson gson = new Gson();
 
// 从Bean生成Json
User user1 = new User();
user1.setId("111");
user1.setName("111name");
String user1Json = gson.toJson(user1);
//输出：{"id":"111","name":"111name"}
 
// 从Json生成Bean
String user2Json = "{'id':'112','name':'112name'}";
User user2 = gson.fromJson(user2Json,User.class );
//输出： User [id=112,name=112name]
 
//从Map生成Json
HashMap<String,String> mapJson = new HashMap<String,String>();
mapJson.put("id","113");
mapJson.put("name","113name");
String mapJsonStr = gson.toJson(mapJson);
//输出：{"name":"113name","id":"113"}
 
//从List生成Json
ArrayList<User> userList = new ArrayList<User>();
User user1 = new User();
user1.setId("114");
user1.setName("114name");
User user2 = new User();
user2.setId("115");
user2.setName("115name");
userList.add(user1);
userList.add(user2);
String listJsonStr = gson.toJson(userList);
//输出：[{"id":"114","name":"114name"},{"id":"115","name":"115name"}]