Java EE (Java Enterprise Edition) General Discussion

Hello,

I wonder, how I can manage linefeed handling.

I have the problem, that (on windows) linefeed become "carriage return" and linefeed.

Any Idea how can I configure, that linefeed will be only linefeeds or will be escaped to 


According to http://www.w3.org/TR/REC-xml/#sec-line-ends linefeed should be a linefeed and a carriage return with linefeed should also be only a linefeed:

XML parsed entities are often stored in computer files which, for editing convenience, are organized into lines. These lines are typically separated by some combination of the characters CARRIAGE RETURN (#xD) and LINE FEED (#xA).

To simplify the tasks of applications, the XML processor MUST behave as if it normalized all line breaks in external parsed entities (including the document entity) on input, before parsing, by translating both the two-character sequence #xD #xA and any #xD that is not followed by #xA to a single #xA character.

Here my sample code:

package test;

import java.io.StringWriter;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.CDATASection;
import org.w3c.dom.DOMConfiguration;
import org.w3c.dom.DOMStringList;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Text;

public class DomTest {

   static String version01(final String testInput) throws Exception {
      final DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
      final DocumentBuilder builder = factory.newDocumentBuilder();
      final Document doc = builder.newDocument();

      final DOMConfiguration domConfig = doc.getDomConfig();
      printDomConfiguration(domConfig);

      final Element root = doc.createElement("root-node");
      root.setAttribute("code", testInput);
      doc.appendChild(root);

      final Element metadataElement = doc.createElement("test-node");
      metadataElement.setAttribute("key", testInput);
      metadataElement.setTextContent(testInput);
      root.appendChild(metadataElement);

      final TransformerFactory tranFactory = TransformerFactory.newInstance();
      final Transformer transformer = tranFactory.newTransformer();
      transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
      transformer.setOutputProperty(OutputKeys.INDENT, "yes");
      transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2");
      final Source src = new DOMSource(doc);
      final StringWriter stringWriterOutput = new StringWriter();
      final Result dest = new StreamResult(stringWriterOutput);
      transformer.transform(src, dest);
      final String xmlString = stringWriterOutput.toString();

      return xmlString;
   }

   static String version02(final String testInput) throws Exception {
      final DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
      final DocumentBuilder builder = factory.newDocumentBuilder();
      final Document doc = builder.newDocument();

      final DOMConfiguration domConfig = doc.getDomConfig();
      printDomConfiguration(domConfig);

      final Element root = doc.createElement("root-node");
      root.setAttribute("code", testInput);
      doc.appendChild(root);

      final Element metadataElement = doc.createElement("test-node");
      metadataElement.setAttribute("key", testInput);
      final CDATASection cdataSection = doc.createCDATASection("test-node");
      cdataSection.setTextContent(testInput);
      metadataElement.appendChild(cdataSection);
      root.appendChild(metadataElement);

      final TransformerFactory tranFactory = TransformerFactory.newInstance();
      final Transformer transformer = tranFactory.newTransformer();
      transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
      transformer.setOutputProperty(OutputKeys.INDENT, "yes");
      transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2");
      transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");

      final Source src = new DOMSource(doc);
      final StringWriter stringWriterOutput = new StringWriter();
      final Result dest = new StreamResult(stringWriterOutput);
      transformer.transform(src, dest);
      final String xmlString = stringWriterOutput.toString();

      return xmlString;
   }

   static String version03(final String testInput) throws Exception {
      final DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
      final DocumentBuilder builder = factory.newDocumentBuilder();
      final Document doc = builder.newDocument();

      final DOMConfiguration domConfig = doc.getDomConfig();
      printDomConfiguration(domConfig);

      final Element root = doc.createElement("root-node");
      root.setAttribute("code", testInput);
      doc.appendChild(root);

      final Element metadataElement = doc.createElement("test-node");
      metadataElement.setAttribute("key", testInput);
      final CDATASection cdataSection = doc.createCDATASection("test-node");
      cdataSection.setData(testInput);
      metadataElement.appendChild(cdataSection);
      root.appendChild(metadataElement);

      final TransformerFactory tranFactory = TransformerFactory.newInstance();
      final Transformer transformer = tranFactory.newTransformer();
      transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
      transformer.setOutputProperty(OutputKeys.INDENT, "yes");
      transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2");
      final Source src = new DOMSource(doc);
      final StringWriter stringWriterOutput = new StringWriter();
      final Result dest = new StreamResult(stringWriterOutput);
      transformer.transform(src, dest);
      final String xmlString = stringWriterOutput.toString();

      return xmlString;
   }

   static String version04(final String testInput) throws Exception {
      final DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
      final DocumentBuilder builder = factory.newDocumentBuilder();
      final Document doc = builder.newDocument();

      final DOMConfiguration domConfig = doc.getDomConfig();
      domConfig.setParameter("normalize-characters", Boolean.FALSE);
      printDomConfiguration(domConfig);

      final Element root = doc.createElement("root-node");
      root.setAttribute("code", testInput);
      doc.appendChild(root);

      final Text textNode = doc.createTextNode("test-node");
      textNode.setTextContent(testInput);
      root.appendChild(textNode);

      final TransformerFactory tranFactory = TransformerFactory.newInstance();
      final Transformer transformer = tranFactory.newTransformer();
      transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
      transformer.setOutputProperty(OutputKeys.INDENT, "yes");
      transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2");
      final Source src = new DOMSource(doc);
      final StringWriter stringWriterOutput = new StringWriter();
      final Result dest = new StreamResult(stringWriterOutput);
      transformer.transform(src, dest);
      final String xmlString = stringWriterOutput.toString();

      return xmlString;
   }

   private static void printDomConfiguration(final DOMConfiguration domConfig) {
      // Setting (via Boolean.TRUE & Boolean.FALSE)
      // canonical-form=true not supported
      // check-character-normalization=true not supported
      // element-content-whitespace=false not supported
      final DOMStringList parameterNames = domConfig.getParameterNames();
      for (int i = 0; i < parameterNames.getLength(); i++) {
         final String item = parameterNames.item(i);
         final Object parameter = domConfig.getParameter(item);
         System.out.println("\"" + item + "\": \"" + parameter + "\"");
      }
   }

   /**
    * @param args
    */
   public static void main(String[] args) throws Exception {

      final String testString = "\r\nMein Test\r\n\r\nNoch mehr Test und ]]>ein verdreher\n\rUn jetzt?\nWas nun\rDas";

      System.out.println("Version 01: Not Correct: \\n becomes \\r\\n");
      final String version01 = version01(testString);
      System.out.println(version01);
      System.out.println("-------------");

      System.out.println("Version 02: Not Correct: \\n becomes \\r\\n");
      final String version02 = version02(testString);
      System.out.println(version02);
      System.out.println("-------------");

      System.out.println("Version 03: Not Correct: \\n becomes \\r\\n");
      final String version03 = version03(testString);
      System.out.println(version03);
      System.out.println("-------------");

      System.out.println("Version 04: Not Correct: \\n becomes \\r\\n");
      final String version04 = version04(testString);
      System.out.println(version04);
      System.out.println("-------------");
   }

}