我目前正在使用杰克逊2.1.4,并且在将对象转换为JSON字符串时忽略字段时遇到了一些麻烦。杰克逊序列化:忽略空值(或空)
这里是我的类,用作要转换的对象:
public class JsonOperation {
public static class Request {
@JsonInclude(Include.NON_EMPTY)
String requestType;
Data data = new Data();
public static class Data {
@JsonInclude(Include.NON_EMPTY)
String username;
String email;
String password;
String birthday;
String coinsPackage;
String coins;
String transactionId;
boolean isLoggedIn;
}
}
public static class Response {
@JsonInclude(Include.NON_EMPTY)
String requestType = null;
Data data = new Data();
public static class Data {
@JsonInclude(Include.NON_EMPTY)
enum ErrorCode { ERROR_INVALID_LOGIN, ERROR_USERNAME_ALREADY_TAKEN, ERROR_EMAIL_ALREADY_TAKEN };
enum Status { ok, error };
Status status;
ErrorCode errorCode;
String expiry;
int coins;
String email;
String birthday;
String pictureUrl;
ArrayList <Performer> performer;
}
}
}
而这里的如何我将它转换:
ObjectMapper mapper = new ObjectMapper();
mapper.setVisibility(PropertyAccessor.FIELD, Visibility.ANY);
JsonOperation subscribe = new JsonOperation();
subscribe.request.requestType = "login";
subscribe.request.data.username = "Vincent";
subscribe.request.data.password = "test";
Writer strWriter = new StringWriter();
try {
mapper.writeValue(strWriter, subscribe.request);
} catch (JsonGenerationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (JsonMappingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Log.d("JSON", strWriter.toString())
下面是输出:
{"data":{"birthday":null,"coins":null,"coinsPackage":null,"email":null,"username":"Vincent","password":"test","transactionId":null,"isLoggedIn":false},"requestType":"login"}
哪有我避免这些空值?我只想为“订阅”目的采取必要的信息!
这里正是我要找的输出:
{"data":{"username":"Vincent","password":"test"},"requestType":"login"}
我也试过@JsonInclude(Include.NON_NULL),并把我所有的变量设置为null,但它也不能工作!谢谢你们的帮助!
确实没有办法使include.NON_NULL注释生效?还是NON_EMTPY呢? 因为我知道哪一个是空的,但这取决于情况。我为每个想要序列化/反序列化的对象使用相同的“JsonOperation”类,我只根据情况初始化需要使用的变量。这是一个好办法,或者我应该做几个只包含我需要的变量的类(这样我就不必使用任何注释,因为永远不会有空/空变量) – Shinnyx
Ahhh对不起,我看看现在发生了什么。看到我编辑的答案。 – drewmoore
得到它的工作!我不能相信这是问题......谢谢你! – Shinnyx