Java vs. xml story two: XML and Java object Convert to each other

XML file and Java Object Conversion is a very simple thing, with annotation java files and XML Schema XSD files, you can easily through the JAXB API to implement XML and Java Object conversion

Marshaller Java to XML

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Prviate Static Javax. XML. Bind. JaxbcontextJaxbctx = null;private static Schema schema = null;static {Jaxbctx = Javax. XML. Bind. Jaxbcontext. newinstance(T. Class);//jaxbcontext is thread safeSchemafactory SF = schemafactory. newinstance(xmlconstants. W3c_xml_schema_ns_uri);//Factory not thread safeSchema schema = SF. Newschema(New File ("T.xsd"));//schema is thread safe}private static void Validate (T-t) {Jaxbsource Source = new Jaxbsource (Jaxbctx, T);Validator Validator = Schema. Newvalidator();Validator. Seterrorhandler(New Myvalidationerrorhandler ());Validator. Validate(source);//Saxexception throws if failed, you can define your error handler or just notify the exception to caller}public static void Marshtofile (T-T, file file) {Validate (T);Javax. XML. Bind. MarshallerMarshaller = Jaxbctx. Createmarshaller();//not thread safeMarshaller. SetProperty(javax. XML. Bind. Marshaller. JAXB_encoding,"UTF-8"); Marshaller. SetProperty(javax. XML. Bind. Marshaller. JAXB_formatted_output, Boolean. TRUE);if (logger. isdebugenabled) {StringWriter SW = new StringWriter (); Marshaller.marshal (T, SW); Logger.debug (sw.tostring ());}Marshaller. Marshal(t, file);}

Unmarshaller XML to Java

publicstaticunmarshFromXml(File xmlFile){        Unmarshaller unmarshaller = jaxbCtx.createUnmarshaller();        unmarshaller.setSchema(schema);        //unmarshaller.setEventHandler(new MyValidationErrorHandler());        //UnmarshalException if failed        }

ErrorHandler

Default throw Saxexception If there is a problem with validation (fatal error), you can customize the handler to implement the system behavior when the error occurs, such as more detailed error logging.

public   class  myvalidationerrorhandler  implements  errorhandler     {...... public  void  warning  (Saxparseexception ex)    {Logger.error (Ex.getmessage ()); } public  void  error<    /span> (Saxparseexception ex) {Logger.error (Ex.getmessage ()); } public  void   FatalError  (saxparseexception ex) throws  saxexception {throw  ex; }}

Story Two of Java and XML: XML and Java object Convert to each other