java - @JsonRootName 无法正常工作

Question

这是我的 FacilityDTO

@JsonRootName("Facility")
@XmlAccessorType(XmlAccessType.NONE)
@XmlType(name = "Facility", propOrder = { "id", "name", "totalQuantity" })
public class FacilityDTO implements Serializable {

private static final long serialVersionUID = 1L;

@XmlElement(required = true)
private String id;
@XmlElement(required = true)
private String name;
@XmlElement(required = true)
private double totalQuantity;

public FacilityDTO() {
}

public FacilityDTO(Facility facility) {
    this.name = facility.getName();
    this.totalQuantity = facility.getTotalQuantity();
    this.id = facility.getId();
}// getters setter

这是我的消息正文作者

ByteArrayOutputStream out = new ByteArrayOutputStream();
ObjectMapper mapper = new ObjectMapper();
mapper.registerModule(new Jdk7Module());
mapper.configure(SerializationFeature.WRAP_ROOT_VALUE, true);
mapper.writeValue(out, object);
int bytesCount = out.size();
byte[] bytes = out.toByteArray();
entityStream.write(bytes);
entityStream.flush();

JSON格式的输出是这样的

我的问题是:

1. 为什么结果似乎不正确？我被放置了 @JsonRootName("Facility") 并且还启用了 wrap root 功能。
2. 我漏掉了什么部分？

Answer 1

参见 Jackson JSON Deserialization with Root Element

根据上述，需要配置反序列化如下:mapper.configure(DerializationFeature.UNWRAP_ROOT_VALUE, true);