fastJson 使用

 

一下是测试方法：

//简单java类转json字符串
User user = new User("dmego", "123456");
String UserJson = JSON.toJSONString(user);
System.out.println("简单java类转json字符串:"+UserJson);

//List<Object>转json字符串
User user1 = new User("zhangsan", "123123");
User user2 = new User("lisi", "321321");
List<User> users = new ArrayList<User>();
users.add(user1);
users.add(user2);
String ListUserJson = JSON.toJSONString(users);
System.out.println("List<Object>转json字符串:"+ListUserJson);

//复杂java类转json字符串
UserGroup userGroup = new UserGroup("userGroup", users);
String userGroupJson = JSON.toJSONString(userGroup);
System.out.println("复杂java类转json字符串:"+userGroupJson);

// json串转对象
/* json字符串转简单java对象
 * 字符串：{"password":"123456","username":"dmego"}*/

String jsonStr1 = "{'password':'123456','username':'dmego'}";
User userA = JSON.parseObject(jsonStr1, User.class);
System.out.println("json字符串转简单java对象:"+userA.toString());

/*
 * json字符串转List<Object>对象
 * 字符串：[{"password":"123123","username":"zhangsan"},{"password":"321321","username":"lisi"}]
 */
String jsonStr2 = "[{'password':'123123','username':'zhangsan'},{'password':'321321','username':'lisi'}]";
List<User> users2 = JSON.parseArray(jsonStr2, User.class);
System.out.println("json字符串转List<Object>对象:"+users2.toString());

/*json字符串转复杂java对象
 * 字符串：{"name":"userGroup","users":[{"password":"123123","username":"zhangsan"},{"password":"321321","username":"lisi"}]}
 * */
String jsonStr3 = "{'name':'userGroup','users':[{'password':'123123','username':'zhangsan'},{'password':'321321','username':'lisi','house':{'address':'德茂站'}}]}";
UserGroup userGroup3 = JSON.parseObject(jsonStr3, UserGroup.class);
System.out.println("json字符串转复杂java对象:"+userGroup3);