java 向 JAXB 元素添加属性
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Adding an Attribute to a JAXB Element
提问by JasonH
I'm struggling with some JAXB parsing and need some guidance.
我正在努力处理一些 JAXB 解析，需要一些指导。
Essentially, I'm trying to add attributes to my class variables that I have already declared as Elements using @XmlElement. So far, any attempt to use @XmlAttribute sets the attribute at the class level.
本质上，我试图将属性添加到我已经使用@XmlElement 声明为元素的类变量中。到目前为止，任何使用 @XmlAttribute 的尝试都会在类级别设置属性。
What I"m currently getting is this:
我目前得到的是：
<DataClass newAttribute="test">
<myElement>I wish this element had an attribute</myElement>
<anotherElement>I wish this element had an attribute too</anotherElement>
</DataClass>
I'd like to to do this:
我想这样做：
<DataClass>
<myElement thisAtt="this is what I'm talking about">This is better</myElement>
<anotherElement thisAtt="a different attribute here">So is this</anotherElement>
</DataClass>
I've seen other posts add an attribute to a single element using the @XmlValue, but that doesn't work when you have Elements, and won't work on multiple elements.
我已经看到其他帖子使用@XmlValue 向单个元素添加属性，但是当您拥有 Elements 时这不起作用，并且不适用于多个元素。
Does anyone have a thought on how this could be accomplished?
有没有人想过如何做到这一点？
Thanks! Jason
谢谢！杰森
采纳答案by Ryan Stewart
This will create that XML:
这将创建该 XML：
public class JaxbAttributes {
public static void main(String[] args) throws Exception {
Marshaller marshaller =
JAXBContext.newInstance(DataClass.class).createMarshaller();
StringWriter stringWriter = new StringWriter();
DataClass dataClass = new DataClass(
new Foo("this is what I'm talking about", "This is better"),
new Foo("a different attribute here", "So is this"));
marshaller.marshal(dataClass, stringWriter);
System.out.println(stringWriter);
}
@XmlRootElement(name = "DataClass")
@XmlType(propOrder = {"myElement", "anotherElement"})
static class DataClass {
private Foo myElement;
private Foo anotherElement;
DataClass() {}
public DataClass(Foo myElement, Foo anotherElement) {
this.myElement = myElement;
this.anotherElement = anotherElement;
}
public Foo getMyElement() { return myElement; }
public void setMyElement(Foo myElement) { this.myElement = myElement; }
public Foo getAnotherElement() { return anotherElement; }
public void setAnotherElement(Foo anotherElement) { this.anotherElement = anotherElement; }
}
static class Foo {
private String thisAtt;
private String value;
Foo() {}
public Foo(String thisAtt, String value) {
this.thisAtt = thisAtt;
this.value = value;
}
@XmlAttribute
public String getThisAtt() { return thisAtt; }
public void setThisAtt(String thisAtt) { this.thisAtt = thisAtt; }
@XmlValue
public String getValue() { return value; }
public void setValue(String value) { this.value = value; }
}
}
回答by bdoughan
Note:I'm the EclipseLink JAXB (MOXy)lead, and a member of the JAXB 2.X (JSR-222) expert group.
注意：我是EclipseLink JAXB (MOXy) 的负责人，也是 JAXB 2.X ( JSR-222) 专家组的成员。
Alternatively you could use the @XmlPathextension in MOXy to handle this use case:
或者，您可以使用@XmlPathMOXy 中的扩展来处理此用例：
DataClass
数据类
The @XmlPathannotation can be used with the standard JAXB annotations:
该@XmlPath注释可以与标准的JAXB注释一起使用：
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;
import org.eclipse.persistence.oxm.annotations.XmlPath;
@XmlRootElement(name="DataClass")
@XmlType(propOrder={"myElement", "anotherElement"})
public class DataClass {
private String myElement;
private String myElementThisAtt;
private String anotherElement;
private String anotherElementThisAtt;
public String getMyElement() {
return myElement;
}
public void setMyElement(String myElement) {
this.myElement = myElement;
}
@XmlPath("myElement/@thisAtt")
public String getMyElementThisAtt() {
return myElementThisAtt;
}
public void setMyElementThisAtt(String myElementThisAtt) {
this.myElementThisAtt = myElementThisAtt;
}
public String getAnotherElement() {
return anotherElement;
}
public void setAnotherElement(String anotherElement) {
this.anotherElement = anotherElement;
}
@XmlPath("anotherElement/@thisAtt")
public String getAnotherElementThisAtt() {
return anotherElementThisAtt;
}
public void setAnotherElementThisAtt(String anotherElementThisAtt) {
this.anotherElementThisAtt = anotherElementThisAtt;
}
}
Demo
演示
import javax.xml.bind.JAXBContext;
import javax.xml.bind.Marshaller;
public class Demo {
public static void main(String[] args) throws Exception {
JAXBContext jc = JAXBContext.newInstance(DataClass.class);
DataClass dataClass = new DataClass();
dataClass.setMyElement("This is better");
dataClass.setMyElementThisAtt("this is what I'm talking about");
dataClass.setAnotherElement("So is this");
dataClass.setAnotherElementThisAtt("a different attribute here");
Marshaller marshaller = jc.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
marshaller.marshal(dataClass, System.out);
}
}
Output
输出
<?xml version="1.0" encoding="UTF-8"?>
<DataClass>
<myElement thisAtt="this is what I'm talking about">This is better</myElement>
<anotherElement thisAtt="a different attribute here">So is this</anotherElement>
</DataClass>
More Information
更多信息
