1. 在resource目錄下創(chuàng)建META-INF

在META-INF目錄下創(chuàng)建spring.hanlders: 指定NamespaceHandler膀息；spring.schemas: 指定xsd模版文件. Spring 在初始化的時(shí)候，會(huì)自動(dòng)到META-INF文件下掃描spring.handlers 和 spring.schemas文件

• spring.handlers (前面的key隨意指定)

http\://www.test.com/schema/apple=com.webgroup.test.handlers.MyNameSpaceHandler

-spring.schemas(指定xsd文件路徑)

http\://www.test.com/schema/apple.xsd=/custome-apple.xsd

2. 創(chuàng)建xsd文件

xmlns， targetNameSpace 指定的是在spring.handlers 中自定義的key

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns="http://www.test.com/schema/apple"
            xmlns:xsd="http://www.w3.org/2001/XMLSchema"
            targetNamespace="http://www.test.com/schema/apple">
    <xsd:complexType name="apple">
        <xsd:attribute name ="id" type="xsd:string"></xsd:attribute>
        <xsd:attribute name="name" type="xsd:string"> </xsd:attribute>
    </xsd:complexType>
    <xsd:element name="apple" type="apple"></xsd:element>
</xsd:schema>

3. 創(chuàng)建NameSpaceHandler

public class MyNameSpaceHandler extends NamespaceHandlerSupport {
    @Override
    public void init() {
        registerBeanDefinitionParser("apple", new AppleBeanDefinitionParser());
    }
}

NameSpaceHander管理著complexType 和 BeanDefinitionParser的一一對(duì)應(yīng)關(guān)系拉背。上文中指定的"apple" 要和xsd文件中定義的complexType名保持一致员舵。

4. 創(chuàng)建BeanDefinitionParser

public class AppleBeanDefinitionParser extends AbstractSingleBeanDefinitionParser {
    @Override
    protected Class<?> getBeanClass(Element element) {
        return Apple.class;
    }
    @Override
    protected void doParse(Element element, BeanDefinitionBuilder builder) {
        String id = element.getAttribute("id");
        String name = element.getAttribute("name");
        if (StringUtils.isNotEmpty(id)) {
            builder.addPropertyValue("id", id);
        }
        if (StringUtils.isNotEmpty(name)) {
            builder.addPropertyValue("name", name);
        }
    }
}

BeanDefinitionParser將屬性值從文件里讀出來(lái)工扎，并寫(xiě)在BeanDefinitionBuilder中泪酱。

5. 測(cè)試xml文件

<?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:mytest="http://www.test.com/schema/apple"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.test.com/schema/apple http://www.test.com/schema/apple.xsd">
    <mytest:apple id="1234" name="nameTest"/>
</beans>

xsi:schemaLocation 指定的是spring官方、自定義的nameSpaceHandler和xds文件的路徑娃殖；

6.測(cè)試類

@Controller
public class TestController {
    @Autowired
    private Apple apple;

    @RequestMapping(value = "/test", method = RequestMethod.GET)
    @ResponseBody
    public String test() {
        return  apple.getName();
    }
}