json转换json-lib

刚刚学习了下json-lib,确实很好用，分享一些自己的例子。


使用json-lib 可以把json字符串与java bean、list等相互转换，官网： http://json-lib.sourceforge.net

userbean

public class User {
    private int id;
    private String name;
    private String birthday;
    //get set 方法.....
}

beanlist

public class ListUser {
     private List users;
     //get set 方法
}

测试类

public class Json {
public static void main(String[] args) {
      List list = new ArrayList();  
      for (int i = 0; i < 2; i++) {
            User user = new User();
            user.setId(i);
            user.setName("heartneo"+i);
            user.setBirthday("06/04/2012");
            list.add(user);
       }
       JSONArray jsonArray = JSONArray.fromObject(list); //list转换成json 
       String jsonStr = "{\"users\":" + jsonArray + "}";//手动添加根节点
       System.out.println(jsonArray);
       System.out.println(jsonStr);
       list.clear();
       list = (List) JSONArray.toCollection(jsonArray, User.class);//得到的json转换回list
       System.out.println(((User)list.get(0)).getName());
       //转换带更节点的json
       Map classMap = new HashMap();  
       classMap.put("users", User.class); //放入User类 
       ListUser users = (ListUser) JSONObject.toBean(JSONObject.fromObject(jsonStr), ListUser.class, classMap);//由于ListUser嵌套User所以转换时用这种方法
       System.out.println(users);
       JSONObject jsonObject = JSONObject.fromObject(users.getUsers().get(0)); //获取第一个对象
       User u = (User) JSONObject.toBean(jsonObject, User.class); //转换回bean 
       System.out.println(u.getName());
       }

}

输出结果

[{"birthday":"06/04/2012","id":0,"name":"heartneo0"},{"birthday":"06/04/2012","id":1,"name":"heartneo1"}]
{"users":[{"birthday":"06/04/2012","id":0,"name":"heartneo0"},{"birthday":"06/04/2012","id":1,"name":"heartneo1"}]}
heartneo0
ListUser@211d0a4f
heartneo0

附上代码和支持包。