blocks|key|3143669|text|此属性：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3143670|marshaller.setProperty("com.sun.xml.bind.xmlDeclaration",+false);|code-block|syntax|javascript|3143671|...can被用来没有：|3143672|<?xml+version="1.0"+encoding="UTF-8"+standalone="yes"?>|3143673|然而，我不认为这是最佳实践。|3143674|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

This property:
<pre class="lang-java prettyprint-override"><code>marshaller.setProperty(&quot;com.sun.xml.bind.xmlDeclaration&quot;, false);
</code></pre>
...can be used to have no:
<pre class="lang-xml prettyprint-override"><code>&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot; standalone=&quot;yes&quot;?&gt;
</code></pre>
However, I wouldn't consider this best practice.

blocks|key|3356592|text|在作为JDK1.6一部分的JAXB中|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3356593|marshaller.setProperty(Marshaller.JAXB_FRAGMENT,+true);|code-block|syntax|javascript|3356594|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

in JAXB that is part of JDK1.6
<pre class="lang-java prettyprint-override"><code>marshaller.setProperty(Marshaller.JAXB_FRAGMENT, true);
</code></pre>

blocks|key|357953|text|您可以使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|357954|marshaller.setProperty(Marshaller.JAXB_FRAGMENT,+true);|code-block|syntax|javascript|357955|或|357956|marshaller.setProperty("com.sun.xml.bind.xmlDeclaration",+false)|357957|若要禁用默认XML声明，然后添加自定义XML声明，|357958|<?xml+version="1.0"+encoding="UTF-8"?>|357959|通过|357960|marshaller.setProperty("com.sun.xml.bind.xmlHeaders",
++++++"<?xml+version=\"1.0\"+encoding=\"UTF-8\"?>");|357961|添加到生成的xml，从而避免了standalone="yes"属性。|offset|length|style|BOLD|357962|entityMap^0|0|0|0|0|0|0|0|0|F|G|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|12|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|13|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|14|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|15|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|16|8|@]|9|@]|A|$]]|$1|Q|3|R|5|D|7|17|8|@]|9|@]|A|$E|F]]|$1|S|3|T|5|6|7|18|8|@$U|19|V|1A|W|X]]|9|@]|A|$]]|$1|Y|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|Z|$]]

You can either use
<pre class="lang-java prettyprint-override"><code>marshaller.setProperty(Marshaller.JAXB_FRAGMENT, true);
</code></pre>
or
<pre class="lang-java prettyprint-override"><code>marshaller.setProperty(&quot;com.sun.xml.bind.xmlDeclaration&quot;, false)
</code></pre>
to disable the default XML declaration, and then add your custom XML declaration,
<pre class="lang-xml prettyprint-override"><code>&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;
</code></pre>
by
<pre class="lang-java prettyprint-override"><code>marshaller.setProperty(&quot;com.sun.xml.bind.xmlHeaders&quot;,
 &quot;&lt;?xml version=\&quot;1.0\&quot; encoding=\&quot;UTF-8\&quot;?&gt;&quot;);
</code></pre>
to the generated xml, thus avoiding the standalone=&quot;yes&quot; property.

blocks|key|3143877|text|如果其他人还在努力解决这个问题，您可以考虑使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3143878|marshaller.setProperty(Marshaller.JAXB_FRAGMENT,+Boolean.TRUE);|code-block|syntax|javascript|3143879|要删除所有XML声明，只需在输出流/方法的开头编写您自己的String|offset|length|style|CODE|3143880|entityMap^0|0|0|T|6|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

just if someone else is still struggeling with this problem, you may consider using

<pre><code>marshaller.setProperty(Marshaller.JAXB_FRAGMENT, Boolean.TRUE);
</code></pre>

to remove all of the XML declaration and just write your own <code>String</code> at the beginning of your output stream / method

blocks|key|3356566|text|如果你让文档依赖于DOCTYPE+(例如，使用命名实体)，那么它将不再是独立的，因此standalone="yes"将不被允许出现在XML声明中。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3356567|然而，独立的XML可以在任何地方使用，而非独立的XML解析器对于不加载外部变量的XML解析器来说是有问题的。|3356568|除了与不支持XML的软件的互操作性之外，我不认为这个声明会有什么问题，只是一些可怕的正则表达式。|3356569|entityMap^0|9|7|16|G|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@$9|M|A|N|B|C]|$9|O|A|P|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Q|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|R|8|@]|D|@]|E|$]]|$1|J|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|K|$]]

If you make document dependent on <code>DOCTYPE</code> (e.g. use named entities) then it will stop being standalone, thus <code>standalone="yes"</code> won't be allowed in XML declaration.

However standalone XML can be used anywhere, while non-standalone is problematic for XML parsers that don't load externals. 

I don't see how this declaration could be a problem, other than for interoperability with software that doesn't support XML, but some horrible regex soup.

blocks|key|360725|text|如果您只使用默认的javax.xml包，则可以将编组程序的JAXB_FRAGMENT选项设置为'true‘(这将省略默认的javax.xml处理指令)，并使用XMLStreamWriter的writeProcessingInstruction方法插入您自己的包：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|360726|xmlStreamWriter.writeProcessingInstruction("xml",+"version=\"1.0\"+encoding=\"UTF-8\"");
jaxbMarshaller.setProperty(+Marshaller.JAXB_FRAGMENT,+Boolean.TRUE);
jaxbMarshaller.marshal(object,+xmlStreamWriter);
xmlStreamWriter.writeEndDocument();|code-block|syntax|javascript|360727|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If you are using only the default javax.xml package, you could set the JAXB_FRAGMENT option of the marshaller to 'true' (this omits the default xml processing instruction) and use the writeProcessingInstruction method of the XMLStreamWriter to insert your own:

<pre><code>xmlStreamWriter.writeProcessingInstruction("xml", "version=\"1.0\" encoding=\"UTF-8\"");
jaxbMarshaller.setProperty( Marshaller.JAXB_FRAGMENT, Boolean.TRUE);
jaxbMarshaller.marshal(object, xmlStreamWriter);
xmlStreamWriter.writeEndDocument();
</code></pre>

blocks|key|3356621|text|jaxbMarshaller.setProperty(Marshaller.JAXB_FRAGMENT,+Boolean.TRUE);
jaxbMarshaller.setProperty("com.sun.xml.internal.bind.xmlHeaders",+"<?xml+version=\"1.0\"+encoding=\"UTF-8\"+standalone=\"no\"?>");|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|3356622|对于JDK1.7，这对我来说很有效。可以删除standalone=\"no\“以仅获得xml部分的其余部分。|unstyled|3356623|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>jaxbMarshaller.setProperty(Marshaller.JAXB_FRAGMENT, Boolean.TRUE);
jaxbMarshaller.setProperty("com.sun.xml.internal.bind.xmlHeaders", "&lt;?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?&gt;");
</code></pre>

This worked for me with JDK1.7. standalone=\"no\" can be removed to get only rest of the xml part

blocks|key|355991|text|您可以使用:+marshaller.setProperty("jaxb.fragment"，Boolean.TRUE)；|type|unstyled|depth|inlineStyleRanges|entityRanges|data|355992|它在Java+8上对我有效|355993|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

You can use:
 marshaller.setProperty("jaxb.fragment", Boolean.TRUE);

It works for me on Java 8

blocks|key|357968|text|我的“名气”还不够高，没有“特权”发表评论。;-)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|357969|@Debasis，请注意您指定的属性：|357970|"com.sun.xml.internal.bind.xmlHeaders"|code-block|syntax|javascript|357971|应该是：|357972|"com.sun.xml.bind.xmlHeaders"+(without+the+"internal",+which+are+not+meant+to+be+used+by+the+public)|357973|如果我像您一样使用“内部”属性，我会得到一个javax.xml.bind.PropertyException|357974|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

I don't have a high enough "reputation" to have the "privilege" to comment. ;-)

@Debasis, note that the property you've specified:

<pre><code>"com.sun.xml.internal.bind.xmlHeaders"
</code></pre>

should be:

<pre><code>"com.sun.xml.bind.xmlHeaders" (without the "internal", which are not meant to be used by the public)
</code></pre>

If I use the "internal" property as you did, I get a javax.xml.bind.PropertyException

blocks|key|360732|text|如果遇到属性异常，请添加以下配置：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|360733|jaxbMarshaller.setProperty("com.sun.xml.internal.bind.xmlHeaders",
++++++++++++++"<?xml+version=\"1.0\"+encoding=\"UTF-8\"?>");
jaxbMarshaller.setProperty("com.sun.xml.internal.bind.xmlDeclaration",+Boolean.FALSE);
jaxbMarshaller.setProperty(Marshaller.JAXB_FRAGMENT,+Boolean.TRUE);++|code-block|syntax|javascript|360734|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

In case you are getting property exception, add the following configuration: 

<pre><code>jaxbMarshaller.setProperty("com.sun.xml.internal.bind.xmlHeaders",
 "&lt;?xml version=\"1.0\" encoding=\"UTF-8\"?&gt;");
jaxbMarshaller.setProperty("com.sun.xml.internal.bind.xmlDeclaration", Boolean.FALSE);
jaxbMarshaller.setProperty(Marshaller.JAXB_FRAGMENT, Boolean.TRUE); 
</code></pre>

blocks|key|3143938|text|试试看|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3143939|private+String+marshaling2(Object+object)+throws+JAXBException,+XMLStreamException+{
++++JAXBContext+jaxbContext+=+JAXBContext.newInstance(object.getClass());
++++Marshaller+jaxbMarshaller+=+jaxbContext.createMarshaller();
++++jaxbMarshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT,+true);
++++jaxbMarshaller.setProperty(Marshaller.JAXB_FRAGMENT,+Boolean.TRUE);
++++StringWriter+writer+=+new+StringWriter();
++++writer.write("<?xml+version=\"1.0\"+encoding=\"UTF-8\"?>\n");
++++jaxbMarshaller.marshal(object,+writer);
++++return+writer.toString();
++}|code-block|syntax|javascript|3143940|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

just try

<pre><code>private String marshaling2(Object object) throws JAXBException, XMLStreamException {
 JAXBContext jaxbContext = JAXBContext.newInstance(object.getClass());
 Marshaller jaxbMarshaller = jaxbContext.createMarshaller();
 jaxbMarshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
 jaxbMarshaller.setProperty(Marshaller.JAXB_FRAGMENT, Boolean.TRUE);
 StringWriter writer = new StringWriter();
 writer.write("&lt;?xml version=\"1.0\" encoding=\"UTF-8\"?&gt;\n");
 jaxbMarshaller.marshal(object, writer);
 return writer.toString();
 }
</code></pre>

blocks|key|356001|text|我使用的是Java+1.8和JAXB+2.3.1|type|unstyled|depth|inlineStyleRanges|entityRanges|data|356002|首先，一定要在pom.xml中使用Java1.8|356003|<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>|code-block|syntax|javascript|356004|然后在源代码中我使用了：(键是内部部分)|356005|//+remove+standalone=yes
marshaller.setProperty(Marshaller.JAXB_FRAGMENT,+true);
marshaller.setProperty("com.sun.xml.internal.bind.xmlHeaders",+"<?xml+version=\"1.0\"+encoding=\"UTF-8\"?>");|356006|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I'm using Java 1.8 and JAXB 2.3.1

First, be sure to be using java 1.8 in pom.xml

<pre><code>&lt;maven.compiler.source&gt;1.8&lt;/maven.compiler.source&gt;
&lt;maven.compiler.target&gt;1.8&lt;/maven.compiler.target&gt;
</code></pre>

Then in source code I used: (the key was the internal part)

<pre><code>// remove standalone=yes
marshaller.setProperty(Marshaller.JAXB_FRAGMENT, true);
marshaller.setProperty("com.sun.xml.internal.bind.xmlHeaders", "&lt;?xml version=\"1.0\" encoding=\"UTF-8\"?&gt;");
</code></pre>

blocks|key|356008|text|如果你有<?xml+version="1.0"+encoding="UTF-8"+standalone="yes"?>|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|356009|但是想要这个：<?xml+version="1.0"+encoding="UTF-8"?>|356010|只需这样做：|356011|marshaller.setProperty(Marshaller.JAXB_FRAGMENT,+Boolean.TRUE);
marshaller.setProperty("com.sun.xml.internal.bind.xmlHeaders",+"<?xml+version=\"1.0\"+encoding=\"UTF-8\"?>");|code-block|syntax|javascript|356012|entityMap^0|4|1J|0|7|12|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|T|8|@$9|U|A|V|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|W|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|X|8|@]|D|@]|E|$M|N]]|$1|O|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|P|$]]

If you have <code>&lt;?xml version="1.0" encoding="UTF-8" standalone="yes"?&gt;</code> 

but want this: <code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;</code>

Just do:

<pre><code>marshaller.setProperty(Marshaller.JAXB_FRAGMENT, Boolean.TRUE);
marshaller.setProperty("com.sun.xml.internal.bind.xmlHeaders", "&lt;?xml version=\"1.0\" encoding=\"UTF-8\"?&gt;");
</code></pre>

Do you know of a JAXB setting to prevent standalone="yes" from being generated in the resulting XML?

<pre><code>&lt;?xml version="1.0" encoding="UTF-8" standalone="yes"?&gt;
</code></pre>

Remove 'standalone="yes"' from generated XML

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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您知道有什么JAXB设置可以防止在生成的XML中生成standalone="yes"吗？<?xml version="1.0" encoding="UTF-8" standalone="yes"?>

问从生成的XML中删除‘standalone=’‘yes’
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问从生成的XML中删除‘standalone=’‘yes’EN

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问从生成的XML中删除‘standalone=’‘yes’
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