我希望将带有嵌套JSON数据的响应解析为Java对象列表。 JSON响应采用以下格式。
{
"IsSuccess": true,
"TotalCount": 250,
"Response": [
{
"Name": "Afghanistan",
"CurrencyCode": "AFN",
"CurrencyName": "Afghan afghani"
},
{
"Name": "Afghanistan",
"CurrencyCode": "AFN",
"CurrencyName": "Afghan afghani"
},
{
"Name": "Afghanistan",
"CurrencyCode": "AFN",
"CurrencyName": "Afghan afghani"
}
]
}
我创建了相应的Country类,用于解析为POJO。我使用杰克逊解析数据。
Client c = ClientBuilder.newClient();
WebTarget t = c.target("http://countryapi.gear.host/v1/Country/getCountries");
Response r = t.request().get();
String s = r.readEntity(String.class);
System.out.println(s);
ObjectMapper mapper = new ObjectMapper();
try {
List<Country> myObjects = mapper.readValue(s, new TypeReference<List<Country>>(){});
System.out.println(myObjects.size());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
实际的国家/地区列表正在响应&#34;响应&#34;在JSON字符串中。如何检索“响应”下的内容,然后将其解析为国家/地区列表?
答案 0 :(得分:2)
不确定您使用的客户端API不能简单地提供所需类型的实体。大多数客户应该有实用方法来进行这种转换。无论如何,这是一种你可以达到你想要的方式:
final JsonNode jsonNode = mapper.readTree(jsonString);
final ArrayNode responseArray = (ArrayNode) jsonNode.get("Response");
//UPDATED to use convertValue()
final List<Country> countries = mapper.convertValue(responseArray, new TypeReference<List<Country>>(){});
Country.class
class Country {
@JsonProperty("Name")
public String name;
@JsonProperty("CurrencyCode")
public String currencyCode;
@JsonProperty("CurrencyName")
public String currencyName;
}