我有传入的 JSON 字符串,需要解组为 JAXB 带注释的对象。我正在使用抛弃来做到这一点。 JSON 字符串如下所示:
{
objectA :
{
"propertyOne" : "some val",
"propertyTwo" : "some other val",
objectB :
{
"propertyA" : "some val",
"propertyB" : "true"
}
}
}
ObjectA 代码如下所示:
@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "objectA")
public class ObjectA {
@XmlElement(required = true)
protected String propertyOne;
@XmlElement(required = true)
protected String propertyTwo;
@XmlElement(required = true)
protected ObjectB objectB;
}
Object 类代码如下所示:
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "objectB")
public class ObjectB {
@XmlElement(required = true)
protected String propertyA;
@XmlElement(required = true)
protected boolean propertyB;
}
用于解组的代码:
JAXBContext jc = JAXBContext.newInstance(OnjectA.class);
JSONObject obj = new JSONObject(theJsonString);
Configuration config = new Configuration();
MappedNamespaceConvention con = new MappedNamespaceConvention(config);
XMLStreamReader xmlStreamReader = new MappedXMLStreamReader(obj,con);
Unmarshaller unmarshaller = jc.createUnmarshaller();
ObjectA obj = (ObjectA) unmarshaller.unmarshal(xmlStreamReader);
它不会引发任何异常或警告。发生的情况是,ObjectB 已实例化,但其所有属性均未设置其值,即 propertyA 为 null,而 propertyB 的默认值为 false。我一直在努力弄清楚为什么这不起作用。有人可以帮忙吗?
Note:我是EclipseLink JAXB (MOXy)领导者和成员JAXB (JSR-222)专家组。
您模型上的 JAXB 映射似乎是正确的。下面是示例代码,其中我使用了问题中给出的确切模型以及通过 EclipseLink MOXy 提供的 JSON 绑定:
Demo
package forum16365788;
import java.io.File;
import java.util.*;
import javax.xml.bind.*;
import org.eclipse.persistence.jaxb.JAXBContextProperties;
public class Demo {
public static void main(String[] args) throws Exception {
Map<String, Object> properties = new HashMap<String, Object>(1);
properties.put(JAXBContextProperties.MEDIA_TYPE, "application/json");
JAXBContext jc = JAXBContext.newInstance(new Class[] {ObjectA.class}, properties);
Unmarshaller unmarshaller = jc.createUnmarshaller();
File json = new File("src/forum16365788/input.json");
ObjectA objectA = (ObjectA) unmarshaller.unmarshal(json);
Marshaller marshaller = jc.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
marshaller.marshal(objectA, System.out);
}
}
输入.json/输出
下面是我使用的 JSON。按键objectA
and objectB
应该被引用,你的问题中没有这个。
{
"objectA" : {
"propertyOne" : "some val",
"propertyTwo" : "some other val",
"objectB" : {
"propertyA" : "some val",
"propertyB" : true
}
}
}
了解更多信息
- http://blog.bdoughan.com/2011/08/json-binding-with-eclipselink-moxy.html
- http://blog.bdoughan.com/2011/05/specifying-eclipselink-moxy-as-your.html
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