如何停止在输出文件中添加XML标记的Marshaller类?

I am marshalling my Object in 2 separate steps. One adds Header and the other one adds the Body. Now when I use this code

我用两个单独的步骤对对象进行编组。一个添加标题，另一个添加正文。当我使用这个代码时

marshaller.marshal(payload, writer); 
//payload is Objects name and writer is StringWriter class object

The XML tag, <?xml version="1.0" encoding="utf-8"?> is added twice in the final output file.

XML标记,< ?xml version = " 1.0 " encoding = " utf - 8 " ?>在最终输出文件中添加了两次。

How can I not add the [<?xml version="1.0" encoding="utf-8"?>] XML tag second time when I am marshalling the body part??

如何不添加[

I have used all the properties of Marshaller interface, but that did not help.

我已经使用了Marshaller接口的所有属性，但这并没有帮助。

2 个解决方案

#1

You need to do the following:

你需要做以下工作:

Manually write the root element (not using JAXB)
手工编写根元素(不使用JAXB)
Marshal the Header object. The root element should be the local root element for the header.
元帅头对象。根元素应该是头的本地根元素。
Marshal the Body object. The root element should be the local root element for the body.
元帅人体对象。根元素应该是主体的本地根元素。
Manually close the root element (not using JAXB)
手动关闭根元素(不使用JAXB)

If possible use a StAX XMLStreamWriter to do the manual writing and the marshalling. I have a related example on my blog:

如果可能的话，使用StAX XMLStreamWriter进行手工编写和编组。我在我的博客上有一个相关的例子:

http://blog.bdoughan.com/2012/08/handle-middle-of-xml-document-with-jaxb.html
http://blog.bdoughan.com/2012/08/handle-middle-of-xml-document-with-jaxb.html

Note:

注意:

When you marshal into an XML document you must specify the following property on the Marshaller.

在编组到XML文档时，必须在编组器上指定以下属性。

marshaller.setProperty(Marshaller.JAXB_FRAGMENT, true);

#2

The solution to this problem was quite simpler than writing my own code.

解决这个问题的方法比编写我自己的代码要简单得多。

You need to specify JAXB_FRAGMENT property to true on the Marshaller to avoid this problem. This property lets JAXB know it's marshalling into the middle of a document and that it shouldn't write the header.

您需要在编组器上指定JAXB_FRAGMENT属性为true，以避免这个问题。这个属性让JAXB知道它正在编组到文档的中间，并且不应该写入头。

So I kept below code, just before writing the BODY part :

所以在写正文部分之前，我一直在代码下面:

marshaller.setProperty(Marshaller.JAXB_FRAGMENT, true);

And it works like a charm!

它就像一种魅力!

#1