地图的JAXB映射 [英] JAXB mapping for a map
问题描述
使用JAXB，如何在下面映射< entry key =childResources> ？
Using JAXB, how to map <entry key="childResources"> below?
I尝试将其映射到Map，@XmlRootElement anotated类和其他方式的列表，但没有成功。
I tried mapping it to a Map, to a list of @XmlRootElement anotated classes and other ways, without success.
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<map>
<entry key="extraProperties">
<map>
<entry key="methods">
<list>
<map>
<entry key="name" value="GET" />
</map>
<map />
<map>
<entry key="name" value="POST" />
<entry key="messageParameters">
<map>
<entry key="id">
<map>
<entry key="acceptableValues" value="" />
<entry key="optional" value="false" />
<entry key="defaultValue" value="" />
<entry key="type" value="string" />
</map>
</entry>
<entry key="enabled">
<map>
<entry key="acceptableValues" value="" />
<entry key="optional" value="true" />
<entry key="defaultValue" value="true" />
<entry key="type" value="boolean" />
</map>
</entry>
<entry key="factoryclass">
<map>
<entry key="acceptableValues" value="" />
<entry key="optional" value="false" />
<entry key="defaultValue" value="" />
<entry key="type" value="string" />
</map>
</entry>
<entry key="description">
<map>
<entry key="acceptableValues" value="" />
<entry key="optional" value="true" />
<entry key="defaultValue" value="" />
<entry key="type" value="string" />
</map>
</entry>
<entry key="target">
<map>
<entry key="acceptableValues" value="" />
<entry key="optional" value="true" />
<entry key="defaultValue" value="server" />
<entry key="type" value="string" />
</map>
</entry>
<entry key="property">
<map>
<entry key="acceptableValues" value="" />
<entry key="optional" value="true" />
<entry key="defaultValue" value="" />
<entry key="type" value="string" />
</map>
</entry>
<entry key="restype">
<map>
<entry key="acceptableValues" value="" />
<entry key="optional" value="false" />
<entry key="defaultValue" value="" />
<entry key="type" value="string" />
</map>
</entry>
</map>
</entry>
</map>
</list>
</entry>
<entry key="commands">
<list />
</entry>
<entry key="childResources">
<map>
<entry key="ab/cd" value="http://localhost:4848/management/domain/resources/custom-resource/ab%2Fcd" />
<entry key="xx" value="http://localhost:4848/management/domain/resources/xx" />
</map>
</entry>
</map>
</entry>
<entry key="message" value="" />
<entry key="exit_code" value="SUCCESS" />
<entry key="command" value="custom-resource" />
</map>
推荐答案
java.util.Map接口没有提供者marshal / unmarshal它的实例。您必须编写一个扩展 XmlAdapter 的类，并使用<$ c注释 java.util.Map 属性$ c> @XmlJavaTypeAdapter（MyMapAdapter.class）。
The java.util.Map interface has no provider to marshal/unmarshal its instances. You'll have to write a class that extends XmlAdapter and annotate the java.util.Map attribute with @XmlJavaTypeAdapter(MyMapAdapter.class).
在Google上寻找 jax-rs java一段时间后.util.map ，我最后得到的代码如下。在我的情况下，我将我的适配器命名为 XmlStringMapAdapter 而不是 MyMapAdapter 。
After a while on Google looking for jax-rs java.util.map, I ended up with the codes bellow. In my case I have named my adapter as XmlStringMapAdapter instead of MyMapAdapter.
ServiceDefinition.java
@XmlRootElement(name = "entry")
@XmlAccessorType(XmlAccessType.FIELD)
public class ServiceDefinition {
@XmlAttribute
private String key;
@XmlJavaTypeAdapter(XmlStringMapAdapter.class)
private Map<String, String> map = new HashMap<String, String>();
// getters & setters
}
EntryElement.java
public class EntryElement {
@XmlAttribute public String key;
@XmlAttribute public String value;
public EntryElement() {}
public EntryElement(String key, String value) {
this.key = key;
this.value = value;
}
}
MapElement.java
@XmlRootElement(name = "map")
public class MapElement {
@XmlElement(name = "entry")
public List<EntryElement> entries = new ArrayList<EntryElement>();
public void addEntry(String key, String value) {
entries.add(new EntryElement(key, value));
}
}
XmlStringMapAdapter.java
public class XmlStringMapAdapter extends XmlAdapter<MapElement, Map<String, String>> {
@Override
public MapElement marshal(Map<String, String> v) throws Exception {
if (v == null || v.isEmpty()) {return null;}
MapElement map = new MapElement();
for (String key : v.keySet()) {
map.addEntry(key, v.get(key));
}
return map;
}
@Override
public Map<String, String> unmarshal(MapElement v) throws Exception {
if (v == null) {return null;}
Map<String, String> map = new HashMap<String, String>(v.entries.size());
for(EntryElement entry: v.entries) {
map.put(entry.key, entry.value);
}
return map;
}
}
而且bellow是我的课程用于测试新的地图适配器。
And bellow is a class that I used to test the new map adapter.
ServiceResouce.java
@Path("service")
public class ServiceResource {
@Context
private UriInfo uriInfo;
@GET
@Path("definition")
@Produces("application/xml")
public Response getDefinition() {
ServiceDefinition def = new ServiceDefinition();
UriBuilder b = uriInfo.getBaseUriBuilder();
def.setKey("childResources");
def.getMap().put("ab/cd", b.path("ab/cd").build(this).getPath());
def.getMap().put("xx", b.path("xx").build(this).getPath());
return Response.ok(def).build();
}
}
上述资源的输出如下所示。
Output from the resource above is as shown bellow.
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<entry key="childResources">
<map>
<entry key="ab/cd" value="http://localhost:8080/management/resources/ab/cd" />
<entry key="xx" value="http://localhost:8080/management/resources/xx" />
</map>
</entry>
这篇关于地图的JAXB映射的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
