Java Gson解析多层嵌套json字符串

Question

碰到类似如下格式的json,总是解析失败，希望大神帮助解析一下
{
"code":0,
"message":"",
"data":[
{
"info":{"id":0,"name":"lina","age":10},
"subclass":[]
},
{
"info":{"id":1,"name":"may","age":16},
"subclass":[
{
"info":{"id":2,"name":"aa","age":13},
"subclass":[]
},
{
"info":{"id":3,"name":"bb","age":12},"subclass":[]
}
]
}
]
}

Answer 1

给你个小例子，你可以这样一层一层解下去：

 public static void main(String[] args) {
        String jsonStr = "{\"code\":0,\"message\":\"\",\"data\":[{\"info\":{\"id\":0,\"name\":\"lina\",\"age\":10},\"subclass\":[]},{\"info\":{\"id\":1,\"name\":\"may\",\"age\":16},\"subclass\":[{\"info\":{\"id\":2,\"name\":\"aa\",\"age\":13},\"subclass\":[]},{\"info\":{\"id\":3,\"name\":\"bb\",\"age\":12},\"subclass\":[]}]}]}";

        JSONObject jobj = JSONObject.fromObject(jsonStr);

        if(null != jobj && jobj.has("code")){
            System.out.println("code:" + jobj.getInt("code"));
        }

        if(null != jobj && jobj.has("message")){
            System.out.println("message:" + jobj.getString("message"));
        }

        if(null != jobj && jobj.has("data")){
            JSONArray ja = jobj.getJSONArray("data");

            for(int i = 0; i < ja.size(); i++){
                System.out.println(
                        ja.getJSONObject(i).getJSONObject("info").getInt("id")
                        + " " + ja.getJSONObject(i).getJSONObject("info").getString("name")
                        + " " + ja.getJSONObject(i).getJSONObject("info").getInt("age"));
            }
        }

    }

我做例子的时候用的是 net.sf.json.JSONObject 不过它们大体都是相同的，你可以作为参考。