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[英]Using Jongo and Jackson 2, how to deserialize a MongoDB ObjectId (represented under String _id in a POJO) to an hexadecimal String representation?
[英]How do I deserialize this string to my POJO representation using Jackson in Java?
public class UpdateRequest {
@JsonProperty
private String id;
@JsonProperty
private String type;
@JsonProperty
private long version;
@JsonProperty("fields")
private Map<String, String> values;
}
我的輸入看起來像這樣:
{
"id":"1",
"type":"add",
"version": 20146780,
"fields": {
"pid":"1234",
"location":"99,100",
"lastModified":"2013-12-30T22:15:37.482Z"
}
}
這是我目前使用Jackson進行操作的方式,但失敗了。 我在這里想念什么?
public Optional<UpdateRequest> deserialize(String message) {
ObjectMapper mapper = new ObjectMapper();
Optional<UpdateRequest> updateRequest = Optional
.empty();
try {
updateRequest = Optional.of(mapper.readValue(message,
UpdateRequest.class));
System.out.println(mapper
.writeValueAsString(updateRequest));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return updateRequest;
}
不確定Optional類在這里做什么,但是您可以通過執行以下操作獲取UpdateRequest對象
UpdateRequest updateRequest = mapper.readValue(message, UpdateRequest.class);
您可能想看看這個文檔JacksonInFiveMinutes 。
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