Edit xml declaration encoding with java -

i editing xml-file original encoding ascii in declaration. in resulting file want encoding utf-8 in order write swedish characters åäö, can't @ moment.

an example file equivalent file can found @ archivematica wiki.

the resulting sip.xml after running program copy of above example file can reached @ this link. added tag åäö text in end of document.

as seen in code below have tried setting encoding on transformer, , tried use outputstreamwriter set encoding. in end edited declaration in original file utf-8 , åäö written out. problem seems encoding of original file. if i'm not mistaken shouldn't cause problem change declaration ascii utf-8, question is, how do within program? can after parsing document object, or need before parsing?

package provklasser;  import java.io.file; import java.io.ioexception; import java.util.logging.level; import java.util.logging.logger; import javax.swing.joptionpane; import javax.xml.parsers.documentbuilder; import javax.xml.parsers.documentbuilderfactory; import javax.xml.parsers.parserconfigurationexception; import javax.xml.transform.outputkeys; import javax.xml.transform.transformer; import javax.xml.transform.transformerconfigurationexception; import javax.xml.transform.transformerexception; import javax.xml.transform.transformerfactory; import javax.xml.transform.dom.domsource; import javax.xml.transform.stream.streamresult; import org.w3c.dom.document; import org.w3c.dom.element; import org.xml.sax.saxexception;  /**  *  * @author   */ public class provklass {      /**      * @param args command line arguments      */     public static void main(string[] args) {         try {             file chosenfile = new file("myfile.xml");             //parsing xml file             documentbuilderfactory factory = documentbuilderfactory.newinstance();             factory.setnamespaceaware(true);             documentbuilder builder = factory.newdocumentbuilder();             document metsdoc = builder.parse(chosenfile.getabsolutepath());              element agent = (element) metsdoc.getdocumentelement().appendchild(metsdoc.createelementns("http://www.loc.gov/mets/","mets:agent"));             agent.appendchild(metsdoc.createtextnode("åäö"));              domsource source = new domsource(metsdoc);              // write content xml file             file newfile = new file(chosenfile.getparent(), "sip.xml");              transformerfactory transformerfactory = transformerfactory.newinstance();             transformer transformer = transformerfactory.newtransformer();             transformer.setoutputproperty(outputkeys.encoding, "utf-8");              streamresult result = new streamresult(newfile);              //writer out = new outputstreamwriter(new fileoutputstream("sip.xml"), "utf-8");             //streamresult result = new streamresult(out);             transformer.transform(source, result);          } catch (parserconfigurationexception ex) {             logger.getlogger(provklass.class.getname()).log(level.severe, null, ex);         } catch (saxexception ex) {             logger.getlogger(provklass.class.getname()).log(level.severe, null, ex);         } catch (ioexception ex) {             logger.getlogger(provklass.class.getname()).log(level.severe, null, ex);         } catch (transformerconfigurationexception ex) {             logger.getlogger(provklass.class.getname()).log(level.severe, null, ex);         } catch (transformerexception ex) {             logger.getlogger(provklass.class.getname()).log(level.severe, null, ex);         }      }    } 

update: using metsdoc.getinputencoding() returns utf-8, while metsdoc.getxmlencoding() returns ascii. if parse new file after saving , make new document same result. document seems have right encoding, xml declaration not right.

now edit xml text file before parsing it, replacing parsing part above parsexml(chosenfile.getabsoutepath()); , using following methods:

private string withediteddeclaration(string filename) {     stringbuilder text = new stringbuilder();     try {          string nl = system.getproperty("line.separator");         try (scanner scanner = new scanner(new fileinputstream(filename))) {             string line = scanner.nextline();             text.append(line.replacefirst("ascii", "utf-8") + nl);             while (scanner.hasnextline()) {                  text.append(scanner.nextline() + nl);             }         }      } catch (filenotfoundexception ex) {         logger.getlogger(metsadaption.class.getname()).log(level.severe, null, ex);     }      return text.tostring(); }  private void parsexml(string filename) throws saxexception, ioexception, parserconfigurationexception {     string xmlstring = withediteddeclaration(filename);      //parsing xml file     documentbuilderfactory factory = documentbuilderfactory.newinstance();     factory.setnamespaceaware(true);     documentbuilder builder = factory.newdocumentbuilder();     inputsource = new inputsource();     is.setcharacterstream(new stringreader(xmlstring));     metsdoc = builder.parse(is); } 

it works, seems ugly solution. i'd grateful if knew better way.

i had similar issue xml declaration originally:

<?xml version="1.0" encoding="windows-1252"?> 

but after parsing document , xml utf-8 encoding stayed windows-1252 though bytes utf-8. worked out implementation of transformerfactory com.sun.org.apache.xalan.internal.xsltc.trax.transformerfactoryimpl changing to:

org.apache.xalan.processor.transformerfactoryimpl 

from apache xalan java 2.7.1 resulted in charset in xml deceleration being correctly set , have:

<?xml version="1.0" encoding="utf-8" standalone="yes"?>