Java generates XML indentation and newline __java

One DOM The following code uses the DOM to generate an XML document

Package XML; Import Java.io.File; Import java.io.FileNotFoundException; Import Java.io.FileOutputStream; Import Javax.xml.parsers.DocumentBuilder; Import Javax.xml.parsers.DocumentBuilderFactory; Import javax.xml.parsers.ParserConfigurationException; 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; public class Xmlhandler {public void Createxml () throws FileNotFoundException {Document doc = null; Documentbuilderfactory dbf = Documentbuilderfactory.newinstance (); try {documentbuilder docbuilder = Dbf.newdocumentbuilder (); doc = Docbuilder.newdocument (); Element root = doc.createelement ("root"); Doc.appendchild (root); Element country = doc.createelement ("Contry"); Country.appendchild (doc.createTextnode ("the"); Root.appendchild (country); Element City = doc.createelement ("city"); City.appendchild (Doc.createtextnode ("Beijing")); Country.appendchild (city); City = doc.createelement ("city"); City.appendchild (Doc.createtextnode ("Shanghai")); Country.appendchild (city); Transformerfactory tf = Transformerfactory.newinstance (); Transformer Transformer = Tf.newtransformer (); File File = new file ("E://cities.xml"); FileOutputStream out = new FileOutputStream (file); Streamresult Xmlresult = new Streamresult (out); Transformer.transform (New Domsource (DOC), Xmlresult); catch (Parserconfigurationexception e) {e.printstacktrace ();} catch (Transformerconfigurationexception e) {e.printSt Acktrace (); catch (Transformerexception e) {e.printstacktrace ();} catch (FileNotFoundException e) {e.printstacktrace (); throw e; } public static void Main (String args[]) {Xmlhandler XH = new Xmlhandler (); try {xh.createxml ();} catch (FileNotFound Exception e) {e.printstacktrace ();}} }

The generated XML is as follows
<?xml version= "1.0" encoding= "UTF-8"? ><country><china><city>beijing</city><city >Shanghai</city></china></country>

All XML content is on one line, without wrapping and indenting

Now in the code

Transformer Transformer = Tf.newtransformer ();

Add it back.

Transformer.setoutputproperty (outputkeys.indent, "yes");

Generate XML again

<?xml version= "1.0" encoding= "UTF-8"?> <country> <china> <city>Beijing</city> <city >Shanghai</city> </china> </country>

This time there was a line break, but still no indentation. For this I looked for a number of times Google and Baidu did not find a solution, may have or their own impatience, think of ways to deal with. Add a space to the front

Element.appendchild (Doc.createtextnode ("n"));

The last code is

Package XML; Import Java.io.File; Import java.io.FileNotFoundException; Import Java.io.FileOutputStream; 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; public class Xmlhandler {public void Createxml () throws FileNotFoundException {Document doc = null; Documentbuilderfactory dbf = Documentbuilderfactory.newinstance (); try {documentbuilder docbuilder = Dbf.newdocumentbuilder (); doc = Docbuilder.newdocument (); Element country = doc.createelement ("Country"); Doc.appendchild (country); Country.appendchild (doc.creatEtextnode ("n")); Element-Doc.createelement ("a"); Country.appendchild (a); China.appendchild (Doc.createtextnode ("n")); Element City = doc.createelement ("city"); City.appendchild (Doc.createtextnode ("Beijing")); China.appendchild (city); China.appendchild (Doc.createtextnode ("n")); City = doc.createelement ("city"); City.appendchild (Doc.createtextnode ("Shanghai")); China.appendchild (city); China.appendchild (Doc.createtextnode ("n")); Transformerfactory tf = Transformerfactory.newinstance (); Transformer Transformer = Tf.newtransformer (); File File = new file ("E://cities.xml"); FileOutputStream out = new FileOutputStream (file); Streamresult Xmlresult = new Streamresult (out); Transformer.setoutputproperty (outputkeys.indent, "yes"); Transformer.transform (New Domsource (DOC), Xmlresult); catch (Parserconfigurationexception e) {e.printstacktrace ();} catch (Transformerconfigurationexception e) {e.printSt Acktrace (); catch (Transformerexception e) {e.printstacktrace ();}catch (FileNotFoundException e) {e.printstacktrace (); throw e;}} public static void Main (String args[]) {Xmlhandler XH = new Xmlhandler (); try {xh.createxml ();} catch (Filenotfoundexce Ption e) {e.printstacktrace ();}} }

The resulting XML is

<?xml version= "1.0" encoding= "UTF-8"?> <country> <china> <city>Beijing</city> <city >Shanghai</city> </china> </country>

Two sax generates XML with sax and wraps line indents

Package XML; Import Java.io.FileOutputStream; Import Java.io.StringWriter; Import Javax.xml.transform.OutputKeys; Import Javax.xml.transform.Result; Import Javax.xml.transform.Transformer; Import javax.xml.transform.TransformerConfigurationException; Import Javax.xml.transform.sax.SAXTransformerFactory; Import Javax.xml.transform.sax.TransformerHandler; Import Javax.xml.transform.stream.StreamResult; Import org.xml.sax.SAXException; Import Org.xml.sax.helpers.AttributesImpl; public class Xmlhandler {public string Createxmlfile () {string xmlstr = null; try {result resultxml = new Streamresult ( New FileOutputStream ("E://cities.xml")); StringWriter writerstr = new StringWriter (); Saxtransformerfactory SFF = (saxtransformerfactory) saxtransformerfactory.newinstance (); Transformerhandler th = Sff.newtransformerhandler (); Transformer Transformer = Th.gettransformer (); Transformer.setoutputproperty (outputkeys.encoding, "UTF-8"); Th.setresult (Resultxml); Th.startdocument (); Attributesimpl atTR = new Attributesimpl (); Th.startelement ("", "", "Country", attr); Th.startelement ("", "", "attr"); Th.startelement ("", "", "City", attr); String BJ = "Beijing"; Th.characters (Bj.tochararray (), 0, Bj.length ()); Th.endelement ("", "", "City"); Th.startelement ("", "", "City", attr); String sh = "Shanghai"; Th.characters (Sh.tochararray (), 0, Sh.length ()); Th.endelement ("", "", "City"); Th.endelement ("", "", "a"); Th.endelement ("", "", "country"); Th.enddocument (); Xmlstr = Writerstr.getbuffer (). toString (); catch (Transformerconfigurationexception e) {e.printstacktrace ();} catch (Saxexception e) {e.printstacktrace ();} cat CH (Exception e) {e.printstacktrace ();} return xmlstr; public static void Main (String args[]) {Xmlhandler XH = new Xmlhandler (); Xh.createxmlfile ();}}

The XML generated with Sax is as follows

<?xml version= "1.0" encoding= "UTF-8"? ><country><china><city>beijing</city><city >Shanghai</city></china></country>

Also no line wrapping and indentation

Add in Code

Transformer.setoutputproperty (outputkeys.indent, "yes");

The resulting XML has a newline but is still not indented

<?xml version= "1.0" encoding= "UTF-8"?> <country> <china> <city>Beijing</city> <city >Shanghai</city> </china> </country>

Also follow the methods in the DOM and add spaces

String four = "n"; Transformerhandler.characters (Four.tochararray (), 0,four.length ());

The final Sax code is as follows:

Package XML; Import Java.io.FileOutputStream; Import Java.io.StringWriter; Import Javax.xml.transform.OutputKeys; Import Javax.xml.transform.Result; Import Javax.xml.transform.Transformer; Import javax.xml.transform.TransformerConfigurationException; Import Javax.xml.transform.sax.SAXTransformerFactory; Import Javax.xml.transform.sax.TransformerHandler; Import Javax.xml.transform.stream.StreamResult; Import org.xml.sax.SAXException; Import Org.xml.sax.helpers.AttributesImpl; public class Xmlhandler {public string Createxmlfile () {string xmlstr = null; try {result resultxml = new Streamresult ( New FileOutputStream ("E://cities.xml")); StringWriter writerstr = new StringWriter (); Saxtransformerfactory SFF = (saxtransformerfactory) saxtransformerfactory.newinstance (); Transformerhandler th = Sff.newtransformerhandler (); Transformer Transformer = Th.gettransformer (); Transformer.setoutputproperty (outputkeys.indent, "yes"); Transformer.setoutputproperty (outputkeys.encoding, "UTF-8"); th.seTResult (Resultxml); Th.startdocument (); String four = "n"; String eight = "n"; Attributesimpl attr = new Attributesimpl (); Th.startelement ("", "", "Country", attr); Th.characters (Four.tochararray (), 0,four.length ()); Th.startelement ("", "", "attr"); Th.characters (Eight.tochararray (), 0,eight.length ()); Th.startelement ("", "", "City", attr); String BJ = "Beijing"; Th.characters (Bj.tochararray (), 0, Bj.length ()); Th.endelement ("", "", "City"); Th.characters (Eight.tochararray (), 0,eight.length ()); Th.startelement ("", "", "City", attr); String sh = "Shanghai"; Th.characters (Sh.tochararray (), 0, Sh.length ()); Th.endelement ("", "", "City"); Th.characters (Four.tochararray (), 0,four.length ()); Th.endelement ("", "", "a"); Th.endelement ("", "", "country"); Th.enddocument (); Xmlstr = Writerstr.getbuffer (). toString (); catch (Transformerconfigurationexception e) {e.printstacktrace ();} catch (Saxexception e) {e.printstacktrace ();} cat CH (Exception e) {e.printstacktrace ();} returnXMLSTR; public static void Main (String args[]) {Xmlhandler XH = new Xmlhandler (); Xh.createxmlfile ();}}

The generated XML

<?xml version= "1.0" encoding= "UTF-8"?> <country> <china> <city>Beijing</city> <city >Shanghai</city> </china> </country>