自定义spring.schemas和spring.handlsers

约定不等于承诺〃 2022-03-30 02:28 168阅读 0赞

摘自：[https://blog.csdn.net/ll840768874/article/details/77369204][https_blog.csdn.net_ll840768874_article_details_77369204]

最近看spring源码，看到了Spring提供了可扩展的schema的支持。

1.设计配置属性javabean

2.编写xsd文件

3.编写NamespaceHandlerSupport和BeanDefinitionParser

4.在spring.schemas和spring.handlers中填入关系，使之能关联起来

1.编写JavaBean：

public class Userconfig implements Serializable \{  
    private static final long serialVersionUID = -5680714598279222721L;  
   
    private String id;  
   
    private String name;  
   
    private String password;  
   
    private String phone;  
   
    public String getId() \{  
        return id;  
    \}  
   
    public void setId(String id) \{  
        this.id = id;  
    \}  
   
    public String getName() \{  
        return name;  
    \}  
   
    public void setName(String name) \{  
        this.name = name;  
    \}  
   
    public String getPassword() \{  
        return password;  
    \}  
   
    public void setPassword(String password) \{  
        this.password = password;  
    \}  
   
    public String getPhone() \{  
        return phone;  
    \}  
   
    public void setPhone(String phone) \{  
        this.phone = phone;  
    \}  
   
    @Override  
    public String toString() \{  
        StringBuffer sb = new StringBuffer();  
        sb.append("name="+name).append(" password="+password).append(" phone="+phone);  
        return sb.toString();  
    \}

2.编写xsd文件放在META-INF文件下。PS：maven项目如果没有META-INF文件，需要自己在resources文件夹下创建META-INF文件

<?xml version="1.0" encoding="UTF-8" standalone="no"?>  
<xsd:schema xmlns="http://code.loup.com/schema/loup"  
            xmlns:xsd="http://www.w3.org/2001/XMLSchema"  
            targetNamespace="http://code.loup.com/schema/loup"  
            elementFormDefault="qualified">  
   
    <xsd:import namespace="http://www.w3.org/XML/1998/namespace"></xsd:import>  
   
    <xsd:element name="user">  
        <xsd:complexType>  
            <xsd:attribute name="id" type="xsd:string"></xsd:attribute>  
            <xsd:attribute name="name" type="xsd:string"></xsd:attribute>  
            <xsd:attribute name="password" type="xsd:string"></xsd:attribute>  
            <xsd:attribute name="phone" type="xsd:string"></xsd:attribute>  
        </xsd:complexType>  
    </xsd:element>  
   
</xsd:schema>

3. 编写NamespaceHandlerSupport，写一个类继承NamespaceHandlerSupport  
public class UserHandlers extends NamespaceHandlerSupport \{  
   
    @Override  
    public void init() \{  
        registerBeanDefinitionParser("user", new UserParserDefinitons());  
    \}  
\}  
然后编写BeanDefinitionParser，写一个解析类，继承AbstractBeanDefinitionParser，重写getBeanClass方法和doParse方法，getBeanClass返回的是之前编写的Javabean  
public class UserParserDefinitons extends AbstractSingleBeanDefinitionParser \{  
   
    @Override  
    protected Class<?> getBeanClass(Element element) \{  
        return Userconfig.class;  
    \}  
   
    @Override  
    protected void doParse(Element element, BeanDefinitionBuilder builder) \{  
        String name = element.getAttribute("name");  
   
        String password = element.getAttribute("password");  
   
        String phone = element.getAttribute("phone");  
        builder.addPropertyValue("name",name);  
        builder.addPropertyValue("password",password);  
        builder.addPropertyValue("phone",phone);  
    \}  
   
\}

4.新建spring.schemas,注意此文件放在META-INF文件下，spring加载的时候会读取，里面填入  
http\\://code.loup.com/schema/loup/loup.xsd=META-INF/loup.xsd  
然后新建spring.handlsers，此文件也是放在META-INF文件下，里面填写之前编写的xsd的Namespace的路劲和第三步编写的handlers对应关系

http\\://code.loup.com/schema/loup=com.seckill.handlers.UserHandlers

至此简单的自定义扩展已经结束

在spring的文件中引用

<?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:loup="http://code.loup.com/schema/loup"  
       xsi:schemaLocation="http://www.springframework.org/schema/context  
        http://www.springframework.org/schema/context/spring-context.xsd  
        http://www.springframework.org/schema/beans  
        http://www.springframework.org/schema/beans/spring-beans.xsd  
        http://code.loup.com/schema/loup  
        http://code.loup.com/schema/loup/loup.xsd">  
   
    <loup:user id="testLoup" name="loup" password="123456" phone="111111"></loup:user>  
</beans>

写个测试方法

public void test()\{  
        ApplicationContext context = new ClassPathXmlApplicationContext("conf/spring-test.xml");  
        Userconfig userconfig = (Userconfig) context.getBean("testLoup");  
        System.out.println(userconfig);  
    \}  
输出的内容：

[https_blog.csdn.net_ll840768874_article_details_77369204]: https://blog.csdn.net/ll840768874/article/details/77369204