问题描述
有没有办法告诉xml转换器按字母顺序排列给定XML标签的所有属性？所以我们说...
Is there a way I could tell the xml transformer to sort alphabetically all the attributes for the tags of a given XML? So lets say...
<MyTag paramter1="lol" andTheOtherThing="potato"/>
会变成
<MyTag andTheOtherThing="potato" paramter1="lol"/>
我看到了如何从我找到的例子中格式化它和，但排序标签属性将是我的最后一个问题。
I saw how to format it from the examples I found here and here, but sorting the tag attributes would be the last issue I have.
我希望有类似的东西：
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
transformer.setOutputProperty(OutputKeys.SORTATT, "yes"); // <-- no such thing
这似乎是他们所说的：
Which seems to be what they say:http://docs.oracle.com/javase/1.4.2/docs/api/javax/xml/transform/OutputKeys.html
推荐答案
如上所述，到42时，您可以从XML中生成规范XML，并按字母顺序为您排序属性。
As mentioned, by forty-two, you can make canonical XML from the XML and that will order the attributes alphabetically for you.
在Java中，我们可以使用Apache的Canonicalizer之类的东西。
In Java we can use something like Apache's Canonicalizer
org.apache.xml.security.c14n.Canonicalizer
org.apache.xml.security.c14n.Canonicalizer
这样的事情（假设文件inXMLDoc已经是DOM）：
Something like this (assuming that the Document inXMLDoc is already a DOM):
Document retDoc;
byte[] c14nOutputbytes;
DocumentBuilderFactory factory;
DocumentBuilder parser;
// CANONICALIZE THE ORIGINAL DOM
c14nOutputbytes = Canonicalizer.getInstance(Canonicalizer.ALGO_ID_C14N_WITH_COMMENTS).canonicalizeSubtree(inXMLDoc.getDocumentElement());
// PARSE THE CANONICALIZED BYTES (IF YOU WANT ANOTHER DOM) OR JUST USE THE BYTES
factory = DocumentBuilderFactory.newInstance();
factory.set ... // SETUP THE FACTORY
parser = factory.newDocumentBuilder();
// REPARSE TO GET ANOTHER DOM WITH THE ATTRIBUTES IN ALPHA ORDER
ByteArrayInputStream bais = new ByteArrayInputStream(c14nOutputbytes);
retDoc = parser.parse(bais);
其他事情会在规范化时改变（它将成为Canonical XML ）所以只需要一些属性顺序以外的变化。
Other things will get changed when Canonicalizing of course (it will become Canonical XML http://en.wikipedia.org/wiki/Canonical_XML) so just expect some changes other than the attribute order.
这篇关于使用javax.xml.transform.Transformer为漂亮打印排序xml属性的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！