[英]How to Canonicalize a Stax XML object
i want to Canonicalize a Stax object, the program it's doing it with DOM, but dom can't manage big XML documents (like 1GB), so STAX it's the solution. 我想规范化Stax对象,该程序正在使用DOM进行处理,但是dom无法管理大型XML文档(例如1GB),因此STAX是解决方案。
The Code that i have it's: 我拥有的代码是:
File file=new File("big-1gb.xml");
org.apache.xml.security.Init.init();
DocumentBuilderFactory dfactory = DocumentBuilderFactory.newInstance();
DocumentBuilder documentBuilder = dfactory.newDocumentBuilder();
Document doc = documentBuilder.parse(file);
Canonicalizer c14n = Canonicalizer.getInstance("http://www.w3.org/TR/2001/REC-xml-c14n-20010315");
outputBytes = c14n.canonicalizeSubtree(doc.getElementsByTagName("SomeTag").item(0));
The idea it's do the code below with Stax... 这个想法是用Stax执行下面的代码...
Thx :) 谢谢 :)
I solve this problem with XOM library, here is the equivalent code. 我用XOM库解决了这个问题,这里是等效的代码。
ByteArrayOutputStream bytestream = new ByteArrayOutputStream();
ObjectOutputStream outputstream = new ObjectOutputStream(bytestream);
nu.xom.Builder builder = new nu.xom.Builder(false, new nu.xom.samples.MinimalNodeFactory()); //The false parameter is for avoid a ValidationException that trows XOM
try {
nu.xom.canonical.Canonicalizer outputter = new nu.xom.canonical.Canonicalizer(outputstream);
nu.xom.Document input = builder.build(file);
outputter.write(input);
}
catch (Exception ex) {
System.err.println(ex);
ex.printStackTrace();
}
outputstream.close();
MessageDigest sha1 = MessageDigest.getInstance("SHA1");
sha1.reset();
sha1.update(java.nio.ByteBuffer.wrap(bytestream.toByteArray()));
salidasha1=sha1.digest();
String tagDigestValue=new String(Base64.encodeBase64(salidasha1));
This code can manage files of 200Mb, and take 7 minutes to do the canonicalization, if you have doubt's, see the XOM documentation, it's pretty clear and have a lot of Examples. 这段代码可以管理200Mb的文件,并且花7分钟时间进行规范化,如果您有疑问,请参阅XOM文档,它很清楚,并且有很多示例。
Thx to all for your comments :) 谢谢大家的意见:)
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