Java: Marshalling Object -- 移除 xml 中额外的 ns2 注释

2022-01-19 00:00:00 xml-namespaces xml marshalling java jaxb

我正在尝试根据定义的架构将对象内的数据编组到 xml 文件中.但是，当我打印出 xml 文件时，我会在 xml 标记上收到额外的注释.有没有办法摆脱额外的命名空间注释(即ns2)

I am trying to marshall data within an object into an xml file based on a defined schema. However when I print out the xml file, I recieve extra annotations on the xml tags. Is there any way to get rid of the extra namespace annotation (i.e. ns2)

这是我从编组收到的 xml 示例.

This is an example of the xml I receive from marshalling. 

<?xml version="1.0" encoding="UTF-8" standalone="yes">
<root xmlns:ns2="http://www.something.com/something">
    <ns2:food>steak</ns2:food>
    <ns2:beverage>water</ns2:beverage>
</root>

我想要的是这样的:

<?xml version="1.0" encoding="UTF-8" standalone="yes">
<root xmlns="http://www.something.com/something">
    <food>steak</food>
    <beverage>water</beverage>
</root>

这就是我的 Java 代码正在做的事情:

This is what my Java code is doing:

            JAXBContext context = JAXBContext.newInstance("com.schema");
            JAXBElement<FoodSchema> element = new JAXBElement<FoodSchema>
                (new QName("FoodSchema"), Food.class, foodSchema);
            Marshaller marshaller = context.createMarshaller();
            OutputStream os = new FileOutputStream(object.getFilePath());
            marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true); 
            marshaller.marshal(element, os);

非常感谢任何帮助！谢谢！

Any help is much appreciated! Thanks!

推荐答案

通过在用于构造的QName中添加命名空间URI(http://www.something.com/something")JAXB 元素，并利用包级别的 @XmlSchema 注释将为您提供您正在寻找的命名空间限定:

By adding a namespace URI ("http://www.something.com/something") to the QName used to construct the JAXB element, and leveraging the package level @XmlSchema annotation will get you the namespace qualification that you are looking for:

包裹信息

@XmlSchema(
    namespace="http://www.something.com/something", 
    elementFormDefault=XmlNsForm.QUALIFIED)
package forum7014746;

import javax.xml.bind.annotation.*;

食物

package forum7014746;

import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement
public class Food {

    private String food;
    private String beverage;

    public String getFood() {
        return food;
    }

    public void setFood(String food) {
        this.food = food;
    }

    public String getBeverage() {
        return beverage;
    }

    public void setBeverage(String beverage) {
        this.beverage = beverage;
    }

}

演示

package forum7014746;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.Marshaller;
import javax.xml.namespace.QName;

public class Demo {

    public static void main(String[] args) throws Exception {
        JAXBContext jaxbContext = JAXBContext.newInstance(Food.class);

        Food foodSchema = new Food();
        foodSchema.setFood("steak");
        foodSchema.setBeverage("water");

        JAXBElement<Food> element = new JAXBElement<Food> (new QName("http://www.something.com/something","FoodSchema"), Food.class, foodSchema);

        Marshaller marshaller = jaxbContext.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        marshaller.marshal(element, System.out);
    }

}

输出

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<FoodSchema xmlns="http://www.something.com/something">
    <beverage>water</beverage>
    <food>steak</food>
</FoodSchema>

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