Question

以下是以json格式存储在json文件中的设备详细信息列表。

{"Device_details":[
    {"DUT1":
        {"Interface":"eth1",
        "IP_address":"40.0.0.1/24"},
     "DUT3":
        {"Interface":"eth3",
        "IP_address":"40.0.0.3/24"},
     "DUT2":
        {"Interface":"eth2",
        "IP_address":"40.0.0.2/24"
        }
    }
             ]}

我想遍历每个设备并打印出与单个DUT对应的列表中每个设备的接口和IP地址。

示例输出：

Device : DUT1
Interface : eth1
IP_address : 40.0.0.1/24

Device : DUT2
Interface : eth2
IP_address : 40.0.0.2/24

等...... 显示的设备顺序无关紧要，我想使用GSON执行此操作。到目前为止我的代码：

JsonParser parser = new JsonParser();
JsonElement jsonElement = parser.parse(new FileReader(fileName.json));
jsonObject = jsonElement.getAsJsonObject();
JsonArray devices = jsonObject.getAsJsonArray("Device_details");
JsonElement device_list = devices.get(0);
JsonObject devices_object= device_list.getAsJsonObject();
System.out.println(devices_object.size());
for (int i=0; i < devices_object.size(); i++){
//How do I access the devices and it's details
        };

Answer 1

public static void main(String[] args) throws FileNotFoundException {
    Gson gson = new Gson();
    JsonReader reader = new JsonReader(new FileReader("pathToJson.json"));
    Response res = gson.fromJson(reader, Response.class);
    for (Map<String, Device> map : res.Device_details) {
        for (Map.Entry<String,Device> e : map.entrySet()){
            System.out.println("Device : " + e.getKey());
            Device device = e.getValue();
            System.out.println("Interface : " + device.Interface);
            System.out.println("IP_address : " + device.IP_address);
        }
    }
}

class Device {
    String Interface;
    String IP_address;
}


class Response {
    List<HashMap<String, Device>> Device_details = new ArrayList();
}

JsonReader和gson.fromJson允许您将json映射到java对象。

此处，Response是＆＃34;根元素＆＃34;。其属性Device_details必须与json中的名称相同。

使用gson在java中循环json对象

1 个答案: