Chcę przekonwertować obiekt org.w3c.dom.Document na obiekt typu String. Używam Java 6 i jestem otwarty na użycie dowolnej (całkowicie darmowej) technologii, która sprosta zadaniu. Wypróbowałem rozwiązanie z tego wątku - czy istnieje bardziej elegancki sposób konwersji dokumentu XML na ciąg znaków w Javie niż ten kod? , gdzie mają
DOMImplementationLS domImplementation = (DOMImplementationLS) doc.getImplementation();
LSSerializer lsSerializer = domImplementation.createLSSerializer();
String html = lsSerializer.writeToString(doc);
ale został przywitany następującym przerażającym wyjątkiem…
org.w3c.dom.DOMException: DOM method not supported
at org.w3c.tidy.DOMDocumentImpl.getImplementation(DOMDocumentImpl.java:129)
at com.myco.myproj.cleaners.JTidyCleaner.outputDocAsString(JTidyCleaner.java:74)
at com.myco.myproj.cleaners.JTidyCleaner.parse(JTidyCleaner.java:63)
at com.myco.myproj.util.NetUtilities.getUrlAsDocument(NetUtilities.java:51)
at com.myco.myproj.parsers.AbstractHTMLParser.getEventFromElement(AbstractHTMLParser.java:131)
at com.myco.myproj.parsers.AbstractHTMLParser.parsePage(AbstractHTMLParser.java:100)
at com.myco.myproj.parsers.AbstractHTMLParser.getEvents(AbstractHTMLParser.java:63)
at com.myco.myproj.domain.EventFeed.refresh(EventFeed.java:87)
at com.myco.myproj.domain.EventFeed.getEvents(EventFeed.java:72)
at com.myco.myproj.parsers.impl.ChicagoCouncilGlobalAffairsParserTest.testParser(ChicagoCouncilGlobalAffairsParserTest.java:21)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74)
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:83)
at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Odpowiedzi:
Jeśli możesz dokonać transformacji, możesz spróbować tego.
DocumentBuilderFactory domFact = DocumentBuilderFactory.newInstance(); DocumentBuilder builder = domFact.newDocumentBuilder(); Document doc = builder.parse(st); DOMSource domSource = new DOMSource(doc); StringWriter writer = new StringWriter(); StreamResult result = new StreamResult(writer); TransformerFactory tf = TransformerFactory.newInstance(); Transformer transformer = tf.newTransformer(); transformer.transform(domSource, result); System.out.println("XML IN String format is: \n" + writer.toString());
źródło
użyj czegoś takiego jak
import java.io.*; import javax.xml.transform.*; import javax.xml.transform.dom.*; import javax.xml.transform.stream.*; //method to convert Document to String public String getStringFromDocument(Document doc) { try { DOMSource domSource = new DOMSource(doc); StringWriter writer = new StringWriter(); StreamResult result = new StreamResult(writer); TransformerFactory tf = TransformerFactory.newInstance(); Transformer transformer = tf.newTransformer(); transformer.transform(domSource, result); return writer.toString(); } catch(TransformerException ex) { ex.printStackTrace(); return null; } }
źródło
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
To zadziałało dla mnie, jak udokumentowano na tej stronie :
TransformerFactory tf = TransformerFactory.newInstance(); Transformer trans = tf.newTransformer(); StringWriter sw = new StringWriter(); trans.transform(new DOMSource(document), new StreamResult(sw)); return sw.toString();
źródło
Wersja Scala oparta na odpowiedzi Zaz.
case class DocumentEx(document: Document) { def toXmlString(pretty: Boolean = false):Try[String] = { getStringFromDocument(document, pretty) } } implicit def documentToDocumentEx(document: Document):DocumentEx = { DocumentEx(document) } def getStringFromDocument(doc: Document, pretty:Boolean): Try[String] = { try { val domSource= new DOMSource(doc) val writer = new StringWriter() val result = new StreamResult(writer) val tf = TransformerFactory.newInstance() val transformer = tf.newTransformer() if (pretty) transformer.setOutputProperty(OutputKeys.INDENT, "yes") transformer.transform(domSource, result) Success(writer.toString); } catch { case ex: TransformerException => Failure(ex) } }
Dzięki temu możesz wykonać dowolną funkcję
doc.toXmlString()
lub wywołać tęgetStringFromDocument(doc)
funkcję.źródło