Question

我只需要访问“formatted_address”的值：“4 Place du Louvre，75001 Paris，France”属性。请帮助我如何使用com.google.gson.Gson和java执行此操作而不为整个结构维护单独的POJO类。

{
    "results": [{
        "address_components": [{
            "long_name": "4",
            "short_name": "4",
            "types": ["street_number"]
        }, {
            "long_name": "Place du Louvre",
            "short_name": "Place du Louvre",
            "types": ["route"]
        }, {
            "long_name": "Paris",
            "short_name": "Paris",
            "types": ["locality", "political"]
        }, {
            "long_name": "Paris",
            "short_name": "75",
            "types": ["administrative_area_level_2", "political"]
        }, {
            "long_name": "Île-de-France",
            "short_name": "IDF",
            "types": ["administrative_area_level_1", "political"]
        }, {
            "long_name": "France",
            "short_name": "FR",
            "types": ["country", "political"]
        }, {
            "long_name": "75001",
            "short_name": "75001",
            "types": ["postal_code"]
        }],
        "formatted_address": "4 Place du Louvre, 75001 Paris, France",
        "geometry": {
            "location": {
                "lat": 48.8600425,
                "lng": 2.3412674
            },
            "location_type": "ROOFTOP",
            "viewport": {
                "northeast": {
                    "lat": 48.86139148029149,
                    "lng": 2.342616380291502
                },
                "southwest": {
                    "lat": 48.8586935197085,
                    "lng": 2.339918419708498
                }
            }
        },
        "types": ["street_address"]
    }],
    "status": "OK"
}

我期待下面的解决方案，但是使用gson。

final JSONObject jso = results.getJSONObject(i);
formattedAddress = jso.getString("formatted_address"));

Answer 1

将String解析为Json元素并获取对象结构

JsonElement jelement = new JsonParser().parse(jsonLine);
JsonObject jobject = jelement.getAsJsonObject();

要获取对象，请使用：

JsonObject anObject = jobject.getAsJsonObject("object_name");

要获取数组，请使用：

JsonArray jarray = anObject.getAsJsonArray("array_name");

要获取String值，请使用：

String result = anObject.get("property_name").toString();

如何使用Gson从JSON输出访问特定元素

1 个答案: