Spring如何自定义XML配置扩展

<?xml version="1.0"?>
<xsd:schema
    xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    xmlns="http://demo1.example.com/schema1"
    targetNamespace="http://demo1.example.com/schema1">

  <xsd:complexType name="billType">
    <xsd:attribute name="name" type="xsd:string">
    </xsd:attribute>

    <xsd:attribute name="age" type="xsd:int">
    </xsd:attribute>
  </xsd:complexType>

  <xsd:element name="bill" type="billType">
  </xsd:element>
</xsd:schema>

public class ModelBean {
  private String name;
  private Integer age;

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }

  public Integer getAge() {
    return age;
  }

  public void setAge(Integer age) {
    this.age = age;
  }
}

public class BillBeanDefinitionParser implements BeanDefinitionParser {
  private final Class<?> beanClass;

  public BillBeanDefinitionParser(Class<?> beanClass) {
    this.beanClass = beanClass;
  }


  @Override
  public BeanDefinition parse(Element element, ParserContext parserContext) {
    GenericBeanDefinition genericBeanDefinition = new GenericBeanDefinition();
    genericBeanDefinition.setBeanClass(beanClass);
    genericBeanDefinition.setLazyInit(false);
    genericBeanDefinition.getPropertyValues().add("name", element.getAttribute("name"));
    genericBeanDefinition.getPropertyValues().add("age", element.getAttribute("age"));
    parserContext.getRegistry().registerBeanDefinition(beanClass.getName(),genericBeanDefinition);
    return null;
  }
}

public class BillNameSpaceHandler extends NamespaceHandlerSupport {

  @Override
  public void init() {
    registerBeanDefinitionParser("bill",new BillBeanDefinitionParser(Model.class));
  }
}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:billtag="http://demo1.example.com/schema1"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
              http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
              http://demo1.example.com/schema1 http://demo1.example.com/schema1/model.xsd">

  <billtag:bill name="bill.li" age="18"/>
</beans>

//指定在单元测试启动的时候创建spring的工厂类对象
@ContextConfiguration(locations = {"classpath:applicationContext.xml"})
//RunWith的value属性指定以spring test的SpringJUnit4ClassRunner作为启动类
//如果不指定启动类，默认启用的junit中的默认启动类
@RunWith(value = SpringJUnit4ClassRunner.class)
public class SpringTest {

  @Autowired
  private ApplicationContext applicationContext;

  @Test
  public void testSpring() {
    ModelBean model = (ModelBean) applicationContext.getBean(ModelBean.class.getName());
    System.out.println(model.getAge());
    System.out.println(model.getName());
  }
}