JAXB: 通过schema验证XML文件

在使用JAXB解析XML文件的时候我们有时候可能会需要通过schema文件验证XML的格式，接上文的XMLParser.java

 

示例代码如下：

public   static  Object unmarshal(InputStream xml, Class<?> clazz)  throws  SAXException {
        Object obj = null ;

        ValidationEventCollector vec = new  ValidationEventCollector();

        try  {
            SchemaFactory sf = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
            Schema schema = sf.newSchema(new  File( "C://eclipse//workspace1//STAF//test//employees.xsd" ));

            JAXBContext jc = JAXBContext.newInstance(clazz.getPackage().getName());
            Unmarshaller u = jc.createUnmarshaller();
            u.setSchema(schema);
            u.setEventHandler(vec);

            obj = u.unmarshal(xml);
        } catch  (JAXBException e) {
            throw   new  RuntimeException( "Can't unmarshal the XML file, error message: "  + e.getMessage());
        } finally  {
            if (vec !=  null  && vec.hasEvents()) {
                for (ValidationEvent ve : vec.getEvents()) {
                    String msg = ve.getMessage();
                    ValidationEventLocator vel = ve.getLocator();
                    int  line = vel.getLineNumber();
                    int  column = vel.getColumnNumber();
                    System.out.println();
                    System.err.println("At line "  + line +  ", column "  + column +  ": "  + msg);
                }
            }
        }

        return  obj;
    }

public static Object unmarshal(InputStream xml, Class<?> clazz) throws SAXException {
		Object obj = null;
		
		ValidationEventCollector vec = new ValidationEventCollector();
		
		try {
			SchemaFactory sf = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
            Schema schema = sf.newSchema(new File("C://eclipse//workspace1//STAF//test//employees.xsd"));
			
			JAXBContext jc = JAXBContext.newInstance(clazz.getPackage().getName());
			Unmarshaller u = jc.createUnmarshaller();
			u.setSchema(schema);
            u.setEventHandler(vec);
			
			obj = u.unmarshal(xml);
		} catch (JAXBException e) {
			throw new RuntimeException("Can't unmarshal the XML file, error message: " + e.getMessage());
		} finally {
			if(vec != null && vec.hasEvents()) {
            	for(ValidationEvent ve : vec.getEvents()) {
            		String msg = ve.getMessage();
            		ValidationEventLocator vel = ve.getLocator();
            		int line = vel.getLineNumber();
            		int column = vel.getColumnNumber();
            		System.out.println();
            		System.err.println("At line " + line + ", column " + column + ": " + msg);
            	}
            }
		}
		
		return obj;
	}

 

该代码段适用于单一schema，或者在classpath中的多schema验证，如果是classpath外的多schema验证，请结合参考该文：XML validation for multiple schemas 验证使用多个XSD schema的XML文件