如何使用DOM（JAVA）在XML文檔中添加Doctype

Question

我已經在java中使用DOM創建了一個XML文檔。我無法添加文檔類型。我想要這樣的文檔類型。

<!DOCTYPE IndInfo PUBLIC "EDAFileSomething" "EDAFileSomething_2_0.dtd"> 

這裏是文檔創建代碼。

DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance(); 
DocumentBuilder docBuilder = docFactory.newDocumentBuilder(); 
Document doc = docBuilder.newDocument(); 

這是變壓器對象代碼。

TransformerFactory transformerFactory = TransformerFactory.newInstance(); 
      Transformer transformer = null; 
      try { 
       transformer = transformerFactory.newTransformer(); 
      } catch (TransformerConfigurationException ex) { 
       Logger.getLogger(Reader.class.getName()).log(Level.SEVERE, null, ex); 
      } 
      DOMSource source = new DOMSource(doc); 
      try { 

       StreamResult result = new StreamResult(System.out); 
       transformer.transform(source, result); 
      } catch (TransformerException ex) { 
       Logger.getLogger(Reader.class.getName()).log(Level.SEVERE, null, ex); 
      } 

      System.out.println("File saved!"); 

Answer 1

您可以使用DOM構建doctype並將doctype設置爲輸出屬性。

TransformerFactory transformerFactory = TransformerFactory.newInstance(); 
Transformer transformer = transformerFactory.newTransformer(); 
transformer.setOutputProperty(OutputKeys.INDENT, "yes"); 
transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "no"); 
transformer.setOutputProperty(OutputKeys.METHOD, "xml"); 
DOMImplementation domImpl = document.getImplementation(); 
DocumentType doctype = domImpl.createDocumentType("doctype", 
    "-//Oberon//YOUR PUBLIC DOCTYPE//EN", 
    "YOURDTD.dtd"); 
transformer.setOutputProperty(OutputKeys.DOCTYPE_PUBLIC, doctype.getPublicId()); 
transformer.setOutputProperty(OutputKeys.DOCTYPE_SYSTEM, doctype.getSystemId()); 
DOMSource source = new DOMSource(document); 
StreamResult result = new StreamResult(new File(database)); 
transformer.transform(source, result); 

Answer 2

如果通過調用在DocumentBuilder的getDOMImplementation()方法得到的DOMImplementation一個實例，您可以使用createDocument方法來創建一個新的Document用指定的文檔類型。

它還具有創建DocumentType對象

參考http://docs.oracle.com/javase/1.5.0/docs/api/org/w3c/dom/DOMImplementation.html和http://docs.oracle.com/javase/1.5.0/docs/api/javax/xml/parsers/DocumentBuilder.html更多信息一createDocumentType方法。