spring引入自定义命名空间

需要的写的代码文件：

代码：

FirstParser

public class FirstParser implements BeanDefinitionParser {

    private static final String ACTION = "say";
    @Override
    public BeanDefinition parse(Element element, ParserContext parserContext) {
        String sayWord = element.getAttribute(ACTION);
        System.out.println(sayWord);
        return null;
    }
}



MyNamespaceHandler

public class MyNamespaceHandler extends NamespaceHandlerSupport  {

    @Override
    public void init() {
        this.registerBeanDefinitionParser("word", new FirstParser());
    }
}

customize.xsd

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns="http://www.shishi.com/myschema/customize"
            xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:beans="http://www.springframework.org/schema/beans"
            targetNamespace="http://www.shishi.com/myschema/customize"
            elementFormDefault="qualified" attributeFormDefault="unqualified">
<xsd:element name="word">
    <xsd:complexType>
        <xsd:complexContent>
            <xsd:restriction base="xsd:anyType">
                <xsd:attribute name="say" type="xsd:string" use="required" />
            </xsd:restriction>
        </xsd:complexContent>
    </xsd:complexType>
</xsd:element>
</xsd:schema>

spring.handlers

http\://www.shishi.com/myschema/customize=com.readspring.myannotation.MyNamespaceHandler

spring.schemas

http\://www.shishi.com/myschema/customize.xsd=META-INF/customize.xsd

applicationcontext3.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:customize="http://www.shishi.com/myschema/customize"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
    http://www.shishi.com/myschema/customize http://www.shishi.com/myschema/customize.xsd">

   <customize:word say="hello world" />

</beans>

目的就是解析到<customize:word say="hello world" /> 并且打印 "helloworld"在控制台，只是为了添加自定义命名空间到spring, 没做复杂的行为。

结果：

主要源码：

在

解析自定义命名空间：

BeanDefinitionParserDelegate是beanfactory的装饰对象

进最近这张图的第二个断点的#resolve：

拿到handlerMappings和对handlerMappings#init (也就是把自定义的parser 全部put 到handler的map中)

进第三个断点：

get到word对应的那个parser, 在这里实现具体的业务逻辑

完

spring引入自定义命名空间

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