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我有一个模式定义元素和属性的默认值。我正尝试使用基于该模式的JAXB解析文档，但JAXB未设置默认值。关于如何让JAXB兑现模式的默认值的任何想法？JAXB是否支持默认模式值？
example.xsd：
<?xml version="1.0" encoding="UTF-8"?><xs:schemaxmlns:xs="http://www.w3.org/2001/XMLSchema"
targetNamespace="http://www.example.org/example"
xmlns:tns="http://www.example.org/example">
<xs:element name="root" type="tns:rootType"/>
<xs:complexType name="rootType">
<xs:sequence>
<xs:element name="child" type="tns:childType"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="childType">
<xs:sequence>
<xs:element name="childVal" type="xs:string" default="defaultElVal"/>
</xs:sequence>
<xs:attribute name="attr" type="xs:string" default="defaultAttrVal"/>
</xs:complexType>
example1.xml
<?xml version="1.0" encoding="UTF-8"?>
<tns:root xmlns:tns="http://www.example.org/example" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.example.org/example example.xsd ">
<child>
<childVal/>
</child>
</tns:root>
TestParser.java
package test;
import java.io.File;
import javax.xml.XMLConstants;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.Unmarshaller;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;
public class TestParser {
public static void main(String[] pArgs) {
try {
JAXBContext context = JAXBContext.newInstance(RootElement.class);
Unmarshaller unmarshaller = context.createUnmarshaller();
SchemaFactory schemaFac = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
Schema sysConfigSchema = schemaFac.newSchema(
new File("example.xsd"));
unmarshaller.setSchema(sysConfigSchema);
RootElement root = (RootElement)unmarshaller.unmarshal(
new File("example1.xml"));
System.out.println("Child Val: " + root.getChild().getChildVal());
System.out.println("Child Attr: " + root.getChild().getAttr());
} catch (Exception e) {
System.out.println(e.getMessage());
e.printStackTrace();
}
}
}
RootElement.java
package test;
import javax.xml.bind.annotation.XmlRootElement;
@XmlRootElement(name="root", namespace="http://www.example.org/example")
public class RootElement {
private ChildEl child;
public RootElement() {}
public ChildEl getChild() {
return child;
}
public void setChild(ChildEl pChild) {
this.child = pChild;
}
}
ChildEl.java
package test;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlRootElement;
@XmlRootElement(name="child")
public class ChildEl {
private String attr;
private String childVal;
public ChildEl() {};
@XmlAttribute
public String getAttr() {
return attr;
}
public void setAttr(String pAttr) {
this.attr = pAttr;
}
public String getChildVal() {
return childVal;
}
public void setChildVal(String pVal) {
this.childVal = pVal;
}
}