Question

我已经尽我所能解决了这个问题，但是我陷入了困境。由于某种原因，我在JSON字符串上添加了以下日期，而Mapper在该日期上添加了小时。为什么要添加18:00:00？

   String json = "{\n" + 
        "  \"feature\": {\n" + 
        "    \"due_date\": \"2019-02-25\"\n" + 
        "  }\n" + 
        "}";

    ObjectMapper mapper = new ObjectMapper();
    mapper.enable(SerializationFeature.WRAP_ROOT_VALUE);
    Wrapper feature = mapper.readValue(json, Wrapper.class);
    Feature sample = feature.getFeature();
    System.out.println(sample.getDueDate());

public class Feature implements Serializable {
    @JsonDeserialize(using = DateAdaptor.class)
    private String dueDate;
    public Date getDueDate() {
        return due_date;
    }
    @JsonProperty("due_date")
    public void setDueDate(Date dueDate) {
        this.due_date = dueDate;
    }
}

    public class Wrapper implements Serializable {
private Feature feature;
public Feature getFeature() {
    return feature;
}
public void setFeature(Feature feature) {
    this.feature = feature;
}
    }

public class DateAdaptor extends StdDeserializer<Date>{

    private SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");

    public DateAdaptor() {
        this(null);
    }

    protected DateAdaptor(Class<?> vc) {
        super(vc);
    }

    @Override
    public Date deserialize(JsonParser jsonparser, DeserializationContext context)
      throws IOException, JsonProcessingException {

        String date = jsonparser.getText();
        try {
            return formatter.parse(date);
        } catch (ParseException e) {
            throw new RuntimeException(e);
        }
    }

}

OUTPUT Sun Feb 24 18:00:00 CST 2019

Answer 1

感谢您的帮助。我发现了我的问题所在。我在代码的错误部分/顺序上实现了该类。仅在“反序列化”对象时有效。因此，代码应如下所示。

public class Feature implements Serializable {
private String dueDate;
@JsonDeserialize(using = DateAdaptor.class)
public Date getDueDate() {
    return due_date;
}
@JsonProperty("due_date")
public void setDueDate(Date dueDate) {
    this.due_date = dueDate;
}

使用Jackson反序列化时的日期不正确

1 个答案: