java 如何获得 XmlType 的字符串表示？
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How to get String representation of XmlType?
提问by ryan
Is it possible to convert a javax.xml.bind.annotation.XmlType to the String representation of the XML?
是否可以将 javax.xml.bind.annotation.XmlType 转换为 XML 的字符串表示形式？
Example:
例子：
The following class Req is from a third party library so I can't override the toString() method.
以下类 Req 来自第三方库，因此我无法覆盖 toString() 方法。
@javax.xml.bind.annotation.XmlAccessorType(javax.xml.bind.annotation.XmlAccessType.FIELD)
@javax.xml.bind.annotation.XmlType(name = "req", propOrder = {"myDetails", "customerDetails"})
public class Req {
...
}
In my application I want to simply get a String representation of the XML so that I can log it to a file:
在我的应用程序中，我只想获取 XML 的字符串表示，以便我可以将其记录到文件中：
<Req>
<MyDetails>
...
</MyDetails>
<CustomerDetails>
...
</CustomerDetails>
</Req>
When I try to use JAXB and Marshall to convert to XML String:
当我尝试使用 JAXB 和 Marshall 转换为 XML 字符串时：
JAXBContext context = JAXBContext.newInstance(Req.class);
Marshaller marshaller = context.createMarshaller();
StringWriter sw = new StringWriter();
marshaller.marshal(instanceOfReq, sw);
String xmlString = sw.toString();
I get the following exception:
我收到以下异常：
javax.xml.bind.MarshalException
- with linked exception:
[com.sun.istack.SAXException2: unable to marshal type "mypackage.Req" as an element because it is missing an @XmlRootElement annotation]
I have had a look at the other classes within the third party library and none of them use the @XmlRootElement annotation. Any way around this?
我查看了第三方库中的其他类，但没有一个使用 @XmlRootElement 注释。有什么办法解决这个问题吗？
回答by Bala R
You can use JAXB and marshall it to xml string
您可以使用 JAXB 并将其编组为 xml 字符串
JAXBContext context = JAXBContext.newInstance(Req.class);
Marshaller marshaller = context.createMarshaller();
StringWriter sw = new StringWriter();
marshaller.marshal(instanceOfReq, sw);
String xmlString = sw.toString();
回答by Christian Vielma
Addding to what Bala R indicated, you can do this if your JAXB element don't have the @xmlrootelement
添加到 Bala R 指示的内容，如果您的 JAXB 元素没有 @xmlrootelement
JAXBContext context = JAXBContext.newInstance(YourClass.class);
Marshaller marshaller = context.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
StringWriter sw = new StringWriter();
JAXBElement jx = new JAXBElement(new QName("YourRootElement"), YourClass.class, input);
marshaller.marshal(jx, sw);
String xmlString = sw.toString();
This was also stated here.
