Spring 自定义命名空间解析器
1.主要步骤
主要有以下四步：
- 编写Schema文件
- 自定义NameSpaceHandler 绑定命令空间
- 自定义 BeanDefinitionParse 解析XML作为bd的配置元信息
- 命名空间映射XML
2.代码实现
需要注意的时，把 spring.handlers 文件与 spring.schemas 放在 resource目录下的META-INF文件中
Schema文件 myschema.xsd 放在任意位置均可，但后面命名空间映射XML的时候，路径不要写错
编写Schema文件
<?xml version="1.0" encoding="UTF-8" standalone="no"?><xsd:schema xmlns="http://www.myschema.org/myschema"xmlns:xsd="http://www.w3.org/2001/XMLSchema"targetNamespace="http://www.myschema.org/myschema"><xsd:import namespace="http://www.w3.org/XML/1998/namespace"/><xsd:complexType name="My"><xsd:attribute name="id" type="xsd:long" use="required"/><xsd:attribute name="name" type="xsd:string" use="required"/><xsd:attribute name="gender" type="gender"/></xsd:complexType><xsd:simpleType name="gender"><xsd:restriction base="xsd:string"><xsd:enumeration value="MAN"/><xsd:enumeration value="WOMAN"/></xsd:restriction></xsd:simpleType><xsd:element name="my" type="My"/></xsd:schema>
自定义命名空间处理器 绑定命令空间
package com.sz.myschema.factory.xml;import org.springframework.beans.factory.xml.NamespaceHandlerSupport;public class MyScheamNameSpaceHolder extends NamespaceHandlerSupport {@Overridepublic void init() {this.registerBeanDefinitionParser("my",new MySchemaParse());}}spring.handlers
http\://www.myschema.org/myschema=com.sz.myschema.factory.xml.MyScheamNameSpaceHolder
自定义 BeanDefinitionParse 解析XML
package com.sz.myschema.factory.xml;import com.sz.myschema.factory.bean.My;
import org.springframework.beans.factory.support.AbstractBeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.xml.AbstractBeanDefinitionParser;
import org.springframework.beans.factory.xml.AbstractSimpleBeanDefinitionParser;
import org.springframework.beans.factory.xml.ParserContext;
import org.w3c.dom.Element;public class MySchemaParse extends AbstractSimpleBeanDefinitionParser {@Overrideprotected void doParse(Element element, ParserContext parserContext, BeanDefinitionBuilder builder) {setPropertyValue("id",element,builder);setPropertyValue("name",element,builder);setPropertyValue("gender",element,builder);}public void setPropertyValue(String id,Element element,BeanDefinitionBuilder builder){builder.addPropertyValue(id,element.getAttribute(id));}@Overrideprotected Class<?> getBeanClass(Element element) {return My.class;}
}命名空间映射XML
spring.schemas
http\://www.myschema.org/myschema.xsd=META-INF/myschema.xsd
3.测试
spring.xml 文件
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"xmlns:myschema="http://www.myschema.org/myschema"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://www.springframework.org/schema/beanshttps://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.myschema.org/myschemahttp://www.myschema.org/myschema.xsd"><myschema:my id="18" name="zhangsan" gender="MAN"/></beans>
测试类
package com.sz.myschema;import com.sz.myschema.factory.bean.My;
import org.springframework.beans.factory.support.DefaultListableBeanFactory;
import org.springframework.beans.factory.xml.XmlBeanDefinitionReader;public class App {public static void main(String[] args) {DefaultListableBeanFactory defaultListableBeanFactory = new DefaultListableBeanFactory();XmlBeanDefinitionReader xmlBeanDefinitionReader = new XmlBeanDefinitionReader(defaultListableBeanFactory);xmlBeanDefinitionReader.loadBeanDefinitions("classpath:spring-config.xml");My bean = defaultListableBeanFactory.getBean(My.class);System.out.println("bean = " + bean);}}输出结果
bean = My{id=18, name='zhangsan', gender='MAN'}
完整代码 ：https://gitcode.net/JAVAlife2021/spring.git
