我向外部 RESTful api 發(fā)出了一個 get 請求，并收到一個具有此結(jié)構(gòu)的 json 對象作為響應(yīng)：{ "data": { "id": 1, "name": "John Doe", "email": "doe@john.com", "urlPicture": "urlPicture.com/82819", "address": { "street": "My street", "number": "29", "city": "Nurnberg", "country": "Germany" } }}我不需要此響應(yīng)的所有內(nèi)容，我只想將一些字段保存在數(shù)據(jù)庫中。我的 POJO 類類似于此偽代碼： public class Data{ private User user; // getters and setters } public class User{ private int id; private String name; private String urlPicture; private String country; // getters and setters }但是，當(dāng)我嘗試提取我想要的字段時，我在這個字段中收到 null public void testResponse(){ RestTemplate restTemplate = new RestTemplate(); Data data = new Data(); User user = new User(); Gson gson = new Gson(); String response = restTemplate.getForObject( "https://apifrommyrequest.com/user/{id}", String.class, 73442); user = gson.fromJson(response, User.class); System.out.println(user); } ```My output:22:20:57.641 [main] DEBUG org.springframework.web.client.RestTemplate - HTTP GET https://apifrommyrequest.com/user/7344222:20:57.672 [main] DEBUG org.springframework.web.client.RestTemplate - Accept=[text/plain, application/json, application/*+json, */*]22:20:58.243 [main] DEBUG org.springframework.web.client.RestTemplate - Response 200 OK22:20:58.247 [main] DEBUG org.springframework.web.client.RestTemplate - Reading to [java.lang.String] as "application/json;charset=UTF-8"Data(id=0, name=null, urlPicture=null, country=null)I really don't know how to do anymore.
3 回答
蠱毒傳說
TA貢獻1895條經(jīng)驗 獲得超3個贊
試試下面的代碼。您不能直接訪問國家/地區(qū)，它是放置在嵌套對象中的值。而且由于響應(yīng)主體作為數(shù)據(jù)返回，因此您無法將其轉(zhuǎn)換為用戶對象。首先，您需要將其轉(zhuǎn)換為數(shù)據(jù)對象。
public class User {
private int id;
private String name;
private String urlPicture;
private Address address;
// getters and setters
}
public class Address {
private String country;
// getters and setters
}
public void testResponse(){
RestTemplate restTemplate = new RestTemplate();
Data data = new Data();
User user = new User();
Gson gson = new Gson();
String response = restTemplate.getForObject(
"https://apifrommyrequest.com/user/{id}",
String.class,
73442);
data = gson.fromJson(response, Data.class);
System.out.println(data);
}
明月笑刀無情
TA貢獻1828條經(jīng)驗 獲得超4個贊
如果你愿意，你也可以像這樣設(shè)計你的 POJO（以減少嵌套的 POJO）：
public class Data {
private User data;
//getters and setters
}
public class User {
private int id;
private String name;
private String urlPicture;
private String country;
@JsonProperty("address")
private void unpackNested(Map<String,String> elements)
{
this.country = elements.get("country");
}
//getters and setters
}
然后最后在 Data 類上反序列化
慕慕森
TA貢獻1856條經(jīng)驗 獲得超17個贊
你真的不需要做從字符串到對象的轉(zhuǎn)換，resttemplate 已經(jīng)使用 jackson 為你做了，只需要
YourObject response = restTemplate.getForObject(
"https://apifrommyrequest.com/user/{id}",
YourObject.class,
73442);
然后它將映射到你的 pojo 對象，在這種情況下你真的不需要 gson。
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