java.util.Map属性的Jaxb名称空间 [英] Jaxb namespaces for java.util.Map properties
问题描述
我有一个包含hashmap的简单类：
I have a simple class that contains a hashmap:
@XmlRootElement()
public class Customer {
private long id;
private String name;
private Map<String, String> attributes;
public Map<String, String> getAttributes() {
return attributes;
}
public void setAttributes(Map<String, String> attributes) {
this.attributes = attributes;
}
@XmlAttribute
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public static void main(String[] args) throws Exception {
JAXBContext jc =
JAXBContext.newInstance("com.rbccm.dbos.payments.dao.test");
Customer customer = new Customer();
customer.setId(123);
customer.setName("Jane Doe");
HashMap<String, String> attributes = new HashMap<String, String>();
attributes.put("a1", "v1");
customer.setAttributes(attributes);
StringWriter sw = new StringWriter();
Marshaller m = jc.createMarshaller();
m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
m.marshal(customer, sw);
System.out.println(sw.toString());
}
}
主要方法生成以下XML：
The Main method produces the following XML:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<ns2:customer id="123" xmlns:ns2="http://www.example.org/package">
<ns2:attributes>
<entry>
<key>a1</key>
<value>v1</value>
</entry>
</ns2:attributes>
<ns2:name>Jane Doe</ns2:name>
</ns2:customer>
我遇到的问题是输出hashmap时会删除命名空间。我想生成的是这样的xml：
The problem I have is that the namespace is dropped when outputting the hashmap. What I would like to generate is xml like this:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<ns2:customer id="123" xmlns:ns2="http://www.example.org/package">
<ns2:attributes>
<ns2:entry>
<ns2:key>a1</ns2:key>
<ns2:value>v1</ns2:value>
</ns2:entry>
</ns2:attributes>
<ns2:name>Jane Doe</ns2:name>
</ns2:customer>
推荐答案
你可以使用 XmlAdapter 与您一起 java.util.Map 属性获取您要查找的命名空间资格。
You could use an XmlAdapter with you java.util.Map property to get the namespace qualification you are looking for.
有关使用 XmlAdapter 并使用 java.uti.Map 的示例，请参阅：
For an example of using XmlAdapter with java.uti.Map see:
- http://bdoughan.blogspot.com/2010/07/xmladapter-jaxbs-secret-weapon.html
更多信息在JAXB和名称空间上：
For more info on JAXB and namespaces :
- http://bdoughan.blogspot.com/2010/08/jaxb-namespaces.html
FYI
我正在考虑添加分机 EclipseLink JAXB（MOXy）以更好地处理这种情况：
I am considering adding an extension to EclipseLink JAXB (MOXy) to better handle this scenario:
@XmlMap(wrapper="my-entry", key="@my-key", value="my-value")
public Map<String, PhoneNumber> phoneNumbers = new HashMap<String, PhoneNumber>();
上述注释将对应于以下XML：
The above annotation would correspond to the following XML:
<phoneNumbers>
<my-entry my-key="work">
<my-value>613-555-1111</value>
</my-entry>
</phoneNumbers>
键/值属性将是XPath语句，命名空间信息将遵循为其他语义执行的操作MOXy扩展（例如见下面的链接）：
The key/value properties would be XPath statements, and the namespace information would follow what is done for other MOXy extensions (for an example see link below):
- http://bdoughan.blogspot.com/2010/09/xpath-based-mapping-geocode-example.html
增强请求
- https://bugs.eclipse.org/322423
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