java - 如何使用 GSON 解析变量名 JSON 对象？

Question

如何使用具有可变对象名称的 GSON 解析 JSON？ “路线”对象具有相同的结构，但名称不同。它有许多不同的名称，因为它反射(reflect)了旅行线路。我正在尝试将其直接读入 Java 类(Android、Retrofit)，但我不会为布达佩斯的所有旅行线路创建单一类。是否有可能以某种方式阅读它？

{
"version": 2,
"status": "OK",
"code": 200,
"text": "OK",
"currentTime": 1448881433747,
"data": {
    "limitExceeded": false,
    "references": {
        "routes": {
            "BKK_9630": {
                "id": "BKK_9630",
                "shortName": "963",
                "longName": null,
                "description": "Hűvösvölgy | Nagykovácsi, Tisza István tér",
                "type": "BUS",
                "url": null,
                "color": "1E1E1E",
                "textColor": "FFFFFF",
                "agencyId": "BKK",
                "bikesAllowed": false
            },
            "BKK_0630": {
                "id": "BKK_0630",
                "shortName": "63",
                "longName": null,
                "description": "Hűvösvölgy | Nagykovácsi, Tisza István tér",
                "type": "BUS",
                "url": null,
                "color": "009FE3",
                "textColor": "FFFFFF",
                "agencyId": "BKK",
                "bikesAllowed": false
            }
        },
        "trips": {},
        "alerts": {}
    }
}
}

完整的 JSON 响应: http://futar.bkk.hu/bkk-utvonaltervezo-api/ws/otp/api/where/search.json?query=Erd%C3%A9szh%C3%A1z

提前致谢!

Answer 1

这是你的类结构:

MyObject(主对象):

public class MyObject{

    private Integer version;
    private String status;
    private Integer code;
    private Data data;
}

数据:

public class Data{

    private boolean limitExceeded;
    private References references;
}

引用资料:

public class References{

    private Map<String, Route> routes;
}

路线:

public class Route{

    private String shortName;
}

然后:

String json = "{'version':2,'status':'OK','code':200,'text':'OK','currentTime':1448881433747,'data':{'limitExceeded':false,'references':{'routes':{'BKK_9630':{'id':'BKK_9630','shortName':'963','longName':null,'description':'Hűvösvölgy | Nagykovácsi, Tisza István tér','type':'BUS','url':null,'color':'1E1E1E','textColor':'FFFFFF','agencyId':'BKK','bikesAllowed':false},'BKK_0630':{'id':'BKK_0630','shortName':'63','longName':null,'description':'Hűvösvölgy | Nagykovácsi, Tisza István tér','type':'BUS','url':null,'color':'009FE3','textColor':'FFFFFF','agencyId':'BKK','bikesAllowed':false}},'trips':{},'alerts':{}}}}";
        Gson gson = new Gson();
        MyObject fromJson = gson.fromJson( json, MyObject.class );
        System.out.println( fromJson );

结果:

MyObject [version=2, status=OK, code=200, data=Data [limitExceeded=false, references=References [routes={BKK_9630=Route [shortName=963], BKK_0630=Route [shortName=63]}]]]

请注意，我没有写下您必须写的所有字段。也不要忘记创建 getter 和 setter 和 toString 覆盖。