如何添加同名的对象节点？

Question

我正在尝试为 Web 端点创建 xml 输出。使用 ObjectNodes 构建 xml - 我无法添加具有相同名称的节点，所以我需要

  <feature_set>
       <feature>
         ...
       </feature>
       <feature>
        ...
       </feature>
....

我正在尝试这样做，但行不通：

ObjectNode featureSetNode = ((ObjectNode) sequenceNode).putObject("feature_set");
        
        for (SimpleFeature feature : simpleFeatures ) {
            JsonNode featureNode = featureSetNode.putObject("feature");
        }

结果我只得到一个 feature 节点。如何添加同名节点？

Answer 1

您可以让 jackson 使用这样的注释自动转换对象：

@JacksonXmlRootElement(localName = "feature_set")
public class FeatureRoot {
    @JacksonXmlElementWrapper(useWrapping=false) //this removes wrapper tag
    @JacksonXmlProperty(localName="feature")
    private List<Feature> features;

    public FeatureRoot(List<Feature> features) {
        this.features = features;
    }

    public List<Feature> getFeatures() {
        return features;
    }

}
public class Feature {
    private String name;

    public Feature(String name) {
        this.name = name;
    }


    public String getName() {
        return name;
    }
}

代码如下

    FeatureRoot featureRoot = new FeatureRoot(
        List.of(
            new Feature("test"),
            new Feature("asd")
        )
    );
    XmlMapper mapper = new XmlMapper();
    String xml = mapper.writeValueAsString(featureRoot);

会产生

<feature_set>
    <feature>
        <name>test</name>
    </feature>
    <feature>
        <name>asd</name>
    </feature>
</feature_set>

Answer 2

要从头开始创建相同的密钥条目，请使用：

        ObjectNode featureSetNode = sequenceNode.putObject("feature_set");
        ArrayNode featureNode = featureSetNode.putArray("feature");

        for (SimpleFeature feature : simpleFeatures ) {
            ObjectNode featureNodeImpl = featureNode.addObject();
            featureNodeImpl.put("start", feature.getSeqRegionStart());
        }

       XmlMapper mapper = new XmlMapper();
       String xml = mapper.writeValueAsString(featureRoot);

如何添加同名的对象节点？

How to add ObjectNodes with same names?

java

jackson