fastJson

import com.alibaba.fastjson.JSON;

Group group = new Group();
group.setId(0L);
group.setName("admin");

User guestUser = new User();
guestUser.setId(2L);
guestUser.setName("guest");

User rootUser = new User();
rootUser.setId(3L);
rootUser.setName("root");

group.getUsers().add(guestUser);
group.getUsers().add(rootUser);

String jsonString = JSON.toJSONString(group);

System.out.println(jsonString);

OUTPUT:

{"id":0,"name":"admin","users":[{"id":2,"name":"guest"},{"id":3,"name":"root"}]}

DECODE:

String jsonString = ...;
Group group = JSON.parseObject(jsonString, Group.class);

fastJSON.jar   http://pan.baidu.com/s/1hq4DDBm

转自 http://blog.csdn.net/geekstart/article/details/32701279