Question

我有一个复杂的对象，我正在从通常的“我无法控制的API”返回值。

对于某些API调用，返回的XML如下所示：

<APICall1>
  <VeryComplexObject>
    <VeryComplexObjectElements... >
  </VeryComplexObject>
</APICall1>

没问题，我只是用

@XmlElement
private VeryComplexObject VeryComplexObject;

和往常一样。

但有几个电话想要回来：

<APICall2>
    <VeryComplexObjectElements... >
</APICall2>

我是否可以使用注释来取消unmarshal的<VeryComplexObject>标记但获取内部元素标记？

Answer 1

您可以使用JAXB和StAX通过利用StreamFilter忽略XML元素来实现此目的：

package forum8526002;

import java.io.StringReader;

import javax.xml.bind.*;
import javax.xml.bind.annotation.*;
import javax.xml.stream.*;

public class Demo {

    public static void main(String[] args) throws Exception {
        JAXBContext jc = JAXBContext.newInstance(Foo.class);

        XMLInputFactory xif = XMLInputFactory.newFactory();
        StringReader xml = new StringReader("<APICall2><VeryComplexObjectElements><Bar>Hello World</Bar></VeryComplexObjectElements></APICall2>");
        XMLStreamReader xsr = xif.createXMLStreamReader(xml);
        xsr = xif.createFilteredReader(xsr, new Filter());

        Unmarshaller unmarshaller = jc.createUnmarshaller();
        Foo foo = (Foo) unmarshaller.unmarshal(xsr);

        Marshaller marshaller = jc.createMarshaller();
        marshaller.marshal(foo, System.out);
    }

    @XmlRootElement(name="APICall2")
    static class Foo {

        @XmlElement(name="Bar")
        private String bar;

    }

    static class Filter implements StreamFilter {

        @Override
        public boolean accept(XMLStreamReader reader) {
            return !(reader.isStartElement() && reader.getLocalName().equals("VeryComplexObjectElements"));
        }

    }

}

jaxb抑制嵌套对象的外部标记

1 个答案: