接著定義handler映射文件：customNamespace.properties

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

定義Handler:

??? 主要注冊相應的解析類和裝飾類

??

?publicclass TestNamespaceHandler extends NamespaceHandlerSupport {

???????? publicvoid init() {

?????????????????? //相對于每個xsd中定義的元素

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

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

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

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

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

??? }

??? }

?

定義各個解析類：

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;

?????? }

??? }

?

可以定義EntityResolver，用于驗證相應的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;

?????? }

??? }

關鍵的一步，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());

寫一個測試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>

相關的測試方法：

?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());

??? }

?