移除 ns2 作为默认命名空间前缀

Remove ns2 as default namespace prefix(移除 ns2 作为默认命名空间前缀)

问题描述

我有一个使用默认命名空间打印的文件.元素以 ns2 前缀打印，我需要将其删除，我的代码如何:

I have a file that is printed with a default namespace. The elements are printed with a prefix of ns2, I need this to be removed, how it is with my code:

<ns2:foo xmlns:ns2="http://namespace" />

我希望它是怎样的:

<foo xmlns="http://namespace" />

这就是我的编码方式，我认为这应该足以让 ns2 消失:

this is how I have coded it, something which as I see it should be enough for the ns2 to go away:

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
    xmlns:bar="http://namespace" targetNamespace="http://namespace"
    elementFormDefault="qualified">
...

生成的包信息是这样的:

the generated package-info turns out like this:

@javax.xml.bind.annotation.XmlSchema(namespace = "http://namespace", 
    elementFormDefault = javax.xml.bind.annotation.XmlNsForm.QUALIFIED)
package com.foo.bar;

我这样创建文件:

JAXBContext jaxbContext = JAXBContext.newInstance(generatedClassesPackage);
Marshaller marshaller = jaxbContext.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
marshaller.marshal(new JAXBElement<Foo>(new QName("http://namespace", "Foo"),
Foo.class, rootFoo), outputStream);

generatedClassesPackage 是 package-info.java 和元素所在的包.

generatedClassesPackage is the package where package-info.java and the elements are.

Foo 对象已定义并具有如下元素::

The Foo object is defined and has elements like this::

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "", propOrder = {
    "group"
})
@XmlRootElement(name = "Foo")
public class Foo {

    @XmlElement(name = "Group", required = true)
    protected List<Group> group;

我错过了什么吗?还是我误解了它的工作原理?

Is it something I have missed? or have I misunderstood how this works?

推荐答案

您很可能在响应中有多个命名空间.这将使用创建 ns# 命名空间前缀的默认约定，其中一个成为没有前缀的 xmlns.如果您想控制它，您可以执行以下操作:

Most likely you have multiple namespaces in the response. This will use the default convention of creating ns# namespace prefixes and one of them becomes the xmlns without a prefix. If you want to control this you can do the following:

NamespacePrefixMapper mapper = new NamespacePrefixMapper() {
        public String getPreferredPrefix(String namespaceUri, String suggestion, boolean requirePrefix) {
            if ("http://namespace".equals(namespaceUri) && !requirePrefix)
                return "";
            return "ns";
        }
    };
    marshaller.setProperty("com.sun.xml.bind.namespacePrefixMapper", mapper);
    marshaller.mashal....

这将始终将 http://namespace 设置为默认 xmlns，并在编组时将 ns# 用于所有其他命名空间.如果你愿意，你也可以给他们更多的描述性前缀.

This will set the http://namespace as the default xmlns always and use ns# for all other namespaces when marshalling. You can also give them more descriptive prefixes if you want.

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