接着定义handler映射文件：customNamespace.properties

http\://www.springframework.org/schema/beans/test=org.springframework.beans.factory.xml.support.TestNamespaceHandler

定义Handler:

    主要注册相应的解析类和装饰类

 publicclass TestNamespaceHandler extends NamespaceHandlerSupport {

         publicvoid init() {

                   //相对于每个xsd中定义的元素

       registerBeanDefinitionParser("testBean", new TestBeanDefinitionParser());

       registerBeanDefinitionDecorator("set", new PropertyModifyingBeanDefinitionDecorator());

       registerBeanDefinitionDecorator("debug", new DebugBeanDefinitionDecorator());

       registerBeanDefinitionDecorator("nop", new NopInterceptorBeanDefinitionDecorator());

       registerBeanDefinitionDecoratorForAttribute("object-name", new ObjectNameBeanDefinitionDecorator());

    }

    }

定义各个解析类：

privatestaticclass TestBeanDefinitionParser implements BeanDefinitionParser {

       public BeanDefinition parse(Element element, ParserContext parserContext) {

           RootBeanDefinition definition = new RootBeanDefinition();

           definition.setBeanClass(TestBean.class);

           MutablePropertyValues mpvs = new MutablePropertyValues();

           mpvs.addPropertyValue("name", element.getAttribute("name"));

           mpvs.addPropertyValue("age", element.getAttribute("age"));

           definition.setPropertyValues(mpvs);

           parserContext.getRegistry().registerBeanDefinition(element.getAttribute("id"), definition);

           returnnull;

       }

    }

    privatestaticclassPropertyModifyingBeanDefinitionDecorator implements BeanDefinitionDecorator {

       public BeanDefinitionHolder decorate(Node node, BeanDefinitionHolder definition,

                                                                                             ParserContext parserContext) {

           Element element = (Element)node;

           BeanDefinition def = definition.getBeanDefinition();

           MutablePropertyValues mpvs = (def.getPropertyValues() == null) ?

                                                                                             new MutablePropertyValues() : def.getPropertyValues();

           mpvs.addPropertyValue("name", element.getAttribute("name"));

           mpvs.addPropertyValue("age", element.getAttribute("age"));

           ((AbstractBeanDefinition) def).setPropertyValues(mpvs);

           return definition;

       }

    }

    privatestaticclassDebugBeanDefinitionDecorator extends AbstractInterceptorDrivenBeanDefinitionDecorator {

       protected BeanDefinition createInterceptorDefinition(Node node) {

           returnnew RootBeanDefinition(DebugInterceptor.class);

       }

    }

    privatestaticclassNopInterceptorBeanDefinitionDecorator extends

                                               AbstractInterceptorDrivenBeanDefinitionDecorator {

       protected BeanDefinition createInterceptorDefinition(Node node) {

           returnnew RootBeanDefinition(NopInterceptor.class);

       }

    }

    privatestaticclassObjectNameBeanDefinitionDecorator implements BeanDefinitionDecorator {

       public BeanDefinitionHolder decorate(Node node, BeanDefinitionHolder definition,

                                                                                             ParserContext parserContext) {

           Attr objectNameAttribute = (Attr)node;

           definition.getBeanDefinition().setAttribute("objectName", objectNameAttribute.getValue());

           return definition;

       }

    }

可以定义EntityResolver，用于验证相应的xsd

       privateclass DummySchemaResolver extends PluggableSchemaResolver {

       public DummySchemaResolver() {

           super(CustomNamespaceHandlerTests.this.getClass().getClassLoader());

       }

       public InputSource resolveEntity(String publicId, String systemId) throws IOException {

           InputSource source = super.resolveEntity(publicId, systemId);

           if (source == null) {

              Resource resource =
                                  new ClassPathResource("org/springframework/beans/factory/xml/support/spring-test.xsd");

              source = new InputSource(resource.getInputStream());

              source.setPublicId(publicId);

              source.setSystemId(systemId);

           }

           return source;

       }

    }

关键的一步，如何生效：

                  String location = "org/springframework/beans/factory/xml/support/customNamespace.properties";

       NamespaceHandlerResolver resolver = new DefaultNamespaceHandlerResolver(
                                                                                                                        getClass().getClassLoader(), location);

         DefaultListableBeanFactory beanFactory = new DefaultListableBeanFactory();

       XmlBeanDefinitionReader reader = new XmlBeanDefinitionReader(beanFactory);

       reader.setNamespaceHandlerResolver(resolver);

       reader.setValidationMode(XmlBeanDefinitionReader.VALIDATION_XSD);

       reader.setEntityResolver(new DummySchemaResolver());

       reader.loadBeanDefinitions(getResource());

写一个测试xml文件：

<?xmlversion="1.0"encoding="UTF-8"?>

<beansxmlns="http://www.springframework.org/schema/beans"

            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

            xmlns:test="http://www.springframework.org/schema/beans/test"

            xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd

       http://www.springframework.org/schema/beans/testhttp://www.springframework.org/schema/beans/factory/xml/support/spring-test.xsd">

    <test:testBeanid="testBean"name="Rob Harrop"age="23"/>

    <beanid="customisedTestBean"class="org.springframework.beans.TestBean">

       <test:setname="Rob Harrop"age="23"/>

    </bean>

    <beanid="debuggingTestBean"class="org.springframework.beans.TestBean">

       <test:debug/>

       <propertyname="name"value="Rob Harrop"/>

       <propertyname="age"value="23"/>

    </bean>

    <beanid="chainedTestBean"class="org.springframework.beans.TestBean">

       <test:debug/>

       <test:nop/>

       <propertyname="name"value="Rob Harrop"/>

       <propertyname="age"value="23"/>

    </bean>

    <beanid="decorateWithAttribute"class="org.springframework.beans.TestBean"test:object-name="foo"/>

</beans>

相关的测试方法：

 publicvoid testSimpleParser() throws Exception {

       TestBean bean = (TestBean) this.beanFactory.getBean("testBean");

       assetTestBean(bean);

    }

    publicvoid testSimpleDecorator() throws Exception {

       TestBean bean = (TestBean) this.beanFactory.getBean("customisedTestBean");

       assetTestBean(bean);

    }

    publicvoid testProxyingDecorator() throws Exception {

       ITestBean bean = (ITestBean) this.beanFactory.getBean("debuggingTestBean");

       assetTestBean(bean);

       assertTrue(AopUtils.isAopProxy(bean));

       Advisor[] advisors = ((Advised) bean).getAdvisors();

       assertEquals("Incorrect number of advisors", 1, advisors.length);

       assertEquals("Incorrect advice class.", DebugInterceptor.class, advisors[0].getAdvice().getClass());

    }

    publicvoid testChainedDecorators() throws Exception {

       ITestBean bean = (ITestBean) this.beanFactory.getBean("chainedTestBean");

       assetTestBean(bean);

       assertTrue(AopUtils.isAopProxy(bean));

       Advisor[] advisors = ((Advised) bean).getAdvisors();

       assertEquals("Incorrect number of advisors", 2, advisors.length);

       assertEquals("Incorrect advice class.", DebugInterceptor.class, advisors[0].getAdvice().getClass());

       assertEquals("Incorrect advice class.", NopInterceptor.class, advisors[1].getAdvice().getClass());

    }

    publicvoid testDecorationViaAttribute() throws Exception {

       RootBeanDefinition beanDefinition
                           = (RootBeanDefinition)this.beanFactory.getBeanDefinition("decorateWithAttribute");

       assertEquals("foo", beanDefinition.getAttribute("objectName"));

    }

    privatevoid assetTestBean(ITestBean bean) {

       assertEquals("Invalid name", "Rob Harrop", bean.getName());

       assertEquals("Invalid age", 23, bean.getAge());

    }