使JAXB生成XML處理指令

Question

我正在使用JAXB動態生成XML。

現在，我想使用XSL將其轉換爲HTML。我如何能包括

<?xml-stylesheet type="text/xsl" href=""> 

在動態生成的XML？

Answer 1

你可以使用的StringWriter先寫樣式表信息到它，然後當元帥的對象到它：

StringWriter writer = new StringWriter(); 
//add processing instructions "by hand" with escaped quotation marks 
//or single marks 
writer.println("<?xml version='1.0'?>"); 
writer.println("<?xml-stylesheet type=\"text/xsl\" href=\"\">"); 

//create and configure marshaller to leave out processing instructions 
Marshaller marshaller = context.createMarshaller(); 
marshaller.setProperty(Marshaller.JAXB_FRAGMENT, Boolean.TRUE); 

//marshal to the StringWriter 
marshaller.marshal(someObject,writer); 
//get the string representation 
String str = writer.toString(); 

當然，你也可以直接打印到你想每隔輸出流，例如文件或Sytstem.out。

Answer 2

看看它是如何在做rexsl-core，ReXSL XSL/JAXB/JAX-RS框架的一部分：XslResolver：

final String header = String.format(
    "\n<?xml-stylesheet type='text/xsl' href='%s'?>", 
    StringEscapeUtils.escapeXml("my-stylesheet.xsl") 
); 
marshaller.setProperty("com.sun.xml.bind.xmlHeaders", header); 

Answer 3

JAXBContext jaxbContext; 
try { 
     jaxbContext = JAXBContext.newInstance(new Class[] {SomeObject.class}); 

     StringWriter writer = new StringWriter(); 
     writer.write("<?xml version='1.0'?>"); 
     writer.write("\n"); 
     writer.write("<?xml-stylesheet type=\"text/xsl\" href=\"\">"); 
     writer.write("\n"); 

     Marshaller jaxbMarshaller = jaxbContext.createMarshaller(); 
     jaxbMarshaller.marshal(someobject, writer); 
} 

Answer 4

這裏所有的解決方案是很醜陋和冗長。只需在指定附加標頭的Mashaller對象內設置該行即可。

Marshaller jaxbMarshaller = ... 
jaxbMarshaller.setProperty("com.sun.xml.bind.xmlHeaders", 
    "<?xml-stylesheet type='text/xsl' href='nameoffile.xsl' ?>"); 

本示例將使用樣式表將一個XML對象輸出到一個文件中，並很好地將這些元素的格式設置爲供人類閱讀。對象myXmlObject是MyXmlClass類的，並會被寫入file，由xslUrl給出一個樣式表格式：

JAXBContext context = JAXBContext.newInstance(MyXmlClass.class); 
Marshaller marshaller = context.createMarshaller(); 
//Need to use a Writer to marshal with the XSL 
FileWriter fw = new FileWriter(file); 
//Do this or else the XML is all one line and not human friendly... 
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE); 
marshaller.setProperty("com.sun.xml.bind.xmlHeaders", 
     "<?xml-stylesheet type='text/xsl' href=\"" + 
     xslUrl + 
     "\" ?>"); 
marshaller.marshal(myXmlObject, fw);