handling carriage return in canonicalization with java

问题

I am trying to canonicalize an html text node by com/sun/org/apache/xml/internal/security/c14n/Canonicalizer.java class. My input file has carriage return and a line feed at the end. Upon canonicalization I expect to see the carriage return transformed into . However, the the output I get does not contain the carriage return. It only contains the line feed. How should I modify my code to include the carriage return?

example: my input with cr and lf at the end

<MyNode xmlns="http://www.artsince.com/test#">Lqc3EeJlyY45bBm1lha869dkHWw1w+U8A6aKM2Xuwk3yWTjt0A2Wq/25rAncSBQlBGOCyTmhfic9(crlf)
9mWf4mC2Ui6ccLqCMjFR4mDQApkfoTy+Cu2eHul9CRjKa0TqckFv7ryda9V5MHruueXII/V+gPLT(crlf)
c76LsetK8C1434K66+Q=</MyNode>

this is the sample code I use

DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
dbf.setNamespaceAware(true);
DocumentBuilder db = dbf.newDocumentBuilder();
Document doc = db.parse(new FileInputStream(new File("C:\\text.xml")));

if(!Init.isInitialized())
{
   Init.init();
}

Path xPath = XPathFactory.newInstance().newXPath();
String expression = "child::*/child::text()"; 
NodeList textNodeList = (NodeList) xPath.evaluate(expression, doc, XPathConstants.NODESET);
Canonicalizer cn = Canonicalizer.getInstance(Canonicalizer.ALGO_ID_C14N_OMIT_COMMENTS);
byte[] canonn = cn.canonicalizeXPathNodeSet(textNodeList);
System.out.println(new String(canonn).toCharArray());

and the output I get has only lf in the end

Lqc3EeJlyY45bBm1lha869dkHWw1w+U8A6aKM2Xuwk3yWTjt0A2Wq/25rAncSBQlBGOCyTmhfic9(lf)
9mWf4mC2Ui6ccLqCMjFR4mDQApkfoTy+Cu2eHul9CRjKa0TqckFv7ryda9V5MHruueXII/V+gPLT(lf)
c76LsetK8C1434K66+Q=

however, I expect to see  and lf at the end of lines

Lqc3EeJlyY45bBm1lha869dkHWw1w+U8A6aKM2Xuwk3yWTjt0A2Wq/25rAncSBQlBGOCyTmhfic9&#xD;(lf)
9mWf4mC2Ui6ccLqCMjFR4mDQApkfoTy+Cu2eHul9CRjKa0TqckFv7ryda9V5MHruueXII/V+gPLT&#xD;(lf)
c76LsetK8C1434K66+Q=

回答1:

XML defines that the input can contain all possible kinds of EOL styles but that the parser must replace all of them with a single linefeed (\n, ASCII 10) character.

If you want to protect the character, you must replace ASCII 13 with  yourself before the XML parser sees the input. If you use Java, I suggest to use a FilterInputStream.

来源：https://stackoverflow.com/questions/3449209/handling-carriage-return-in-canonicalization-with-java

标签

java

xml

canonicalization