spring自定义标签

目录图：

引入jar包：

    <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>4.3.12.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>4.3.12.RELEASE</version>
        </dependency>

1：Application类

package com.imddy.ttdubbo.springsupport;

public class Application {
    private String id;
    private String name;
    private String version;

    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 getVersion() {
        return version;
    }

    public void setVersion(String version) {
        this.version = version;
    }

    @Override
    public String toString() {
        return "Application [id=" + id + ", name=" + name + ", version=" + version + "]";
    }
}

2：ApplicationBeanDefinitionParser类

package com.imddy.ttdubbo.springsupport;

import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.xml.AbstractSingleBeanDefinitionParser;
import org.springframework.util.StringUtils;
import org.w3c.dom.Element;

public class ApplicationBeanDefinitionParser extends AbstractSingleBeanDefinitionParser {

    private final Class<?> beanClass;

    private final boolean required;
    
    public ApplicationBeanDefinitionParser(Class<?> beanClass, boolean required) {
        this.beanClass = beanClass;
        this.required = required;
    }

    protected Class getBeanClass(Element element) {
        return Application.class;
    }

    protected void doParse(Element element, BeanDefinitionBuilder bean) {
        String id = element.getAttribute("id");
        String name = element.getAttribute("name");
        String version = element.getAttribute("version");
        if (StringUtils.hasText(id)) {
            bean.addPropertyValue("id", id);
        }
        if (StringUtils.hasText(name)) {
            bean.addPropertyValue("name", name);
        }
        if (StringUtils.hasText(version)) {
            bean.addPropertyValue("version", version);
        }
    }
}

3：Registry类

package com.imddy.ttdubbo.springsupport;

public class Registry {
    private String id;
    private String address;
    private Integer port;
    
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    public String getAddress() {
        return address;
    }
    public void setAddress(String address) {
        this.address = address;
    }
    public Integer getPort() {
        return port;
    }
    public void setPort(Integer port) {
        this.port = port;
    }
    
    @Override
    public String toString() {
        return "Registry [id=" + id + ", address=" + address + ", port=" + port + "]";
    }
}

4：RegistryBeanDefinitionParser类

package com.imddy.ttdubbo.springsupport;

import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.xml.AbstractSingleBeanDefinitionParser;
import org.springframework.util.StringUtils;
import org.w3c.dom.Element;

public class RegistryBeanDefinitionParser extends AbstractSingleBeanDefinitionParser {
    
    protected Class getBeanClass(Element element) {  
        return Registry.class;  
    }
    
    protected void doParse(Element element, BeanDefinitionBuilder bean) {  
        String id = element.getAttribute("id");
        String address = element.getAttribute("address");
        String port = element.getAttribute("port");
        if (StringUtils.hasText(id)) {  
            bean.addPropertyValue("id", id);  
        }  
        if (StringUtils.hasText(address)) {  
            bean.addPropertyValue("address", address);  
        }  
        if (StringUtils.hasText(port)) {  
            bean.addPropertyValue("port", Integer.valueOf(port));  
        }
    }
}

5：TtdubboNamespaceHandler类

package com.imddy.ttdubbo.springsupport;

import org.springframework.beans.factory.xml.NamespaceHandlerSupport;

public class TtdubboNamespaceHandler extends NamespaceHandlerSupport{

    public void init() {
        // TODO Auto-generated method stub
        registerBeanDefinitionParser("application", new ApplicationBeanDefinitionParser(Application.class, true));
        registerBeanDefinitionParser("registry", new RegistryBeanDefinitionParser());
    }

}

6：resources目录下创建META-INF目录

7：spring.handlers

http://ttdubbo.oschina.net/schema/ttdubbo=com.imddy.ttdubbo.springsupport.TtdubboNamespaceHandler

8：spring.schemas

http://ttdubbo.oschina.net/schema/ttdubbo.xsd=META-INF/ttdubbo.xsd

9：ttdubbo.xsd （此文件名可根据 定义的标签起名）

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<xsd:schema xmlns="http://ttdubbo.oschina.net/schema/ttdubbo"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:beans="http://www.springframework.org/schema/beans"
    xmlns:tool="http://www.springframework.org/schema/tool"
    targetNamespace="http://ttdubbo.oschina.net/schema/ttdubbo">


   <xsd:import namespace="http://www.w3.org/XML/1998/namespace"/>


    <xsd:complexType name="applicationType">
        <xsd:attribute name="id" type="xsd:ID">
            <xsd:annotation>
                <xsd:documentation><![CDATA[ The unique identifier for a bean. ]]></xsd:documentation>
            </xsd:annotation>
        </xsd:attribute>
        <xsd:attribute name="name" type="xsd:string" use="required">
            <xsd:annotation>
                <xsd:documentation><![CDATA[ The application name. ]]></xsd:documentation>
            </xsd:annotation>
        </xsd:attribute>
        <xsd:attribute name="version" type="xsd:string">
            <xsd:annotation>
                <xsd:documentation><![CDATA[ The application version. ]]></xsd:documentation>
            </xsd:annotation>
        </xsd:attribute>
    </xsd:complexType>


    <xsd:complexType name="registryType">
        <xsd:attribute name="id" type="xsd:ID">
            <xsd:annotation>
                <xsd:documentation><![CDATA[ The unique identifier for a bean. ]]></xsd:documentation>
            </xsd:annotation>
        </xsd:attribute>
        <xsd:attribute name="address" type="xsd:string" use="required">
            <xsd:annotation>
                <xsd:documentation><![CDATA[ The registry address. ]]></xsd:documentation>
            </xsd:annotation>
        </xsd:attribute>
        <xsd:attribute name="port" type="xsd:string" use="optional">
            <xsd:annotation>
                <xsd:documentation><![CDATA[ The registry default port. ]]></xsd:documentation>
            </xsd:annotation>
        </xsd:attribute>
    </xsd:complexType>


    <xsd:element name="application" type="applicationType">
        <xsd:annotation>
            <xsd:documentation><![CDATA[ The application config ]]></xsd:documentation>
        </xsd:annotation>
    </xsd:element>

    <xsd:element name="registry" type="registryType">
        <xsd:annotation>
            <xsd:documentation><![CDATA[ The registry config ]]></xsd:documentation>
        </xsd:annotation>
    </xsd:element>

</xsd:schema>

10：开始测试：

  创建applicationContext.xml配制文件，引入ttdubbo的Namespaces

<?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:c="http://www.springframework.org/schema/c"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:lang="http://www.springframework.org/schema/lang"
    xmlns:util="http://www.springframework.org/schema/util"
    xmlns:ttdubbo="http://ttdubbo.oschina.net/schema/ttdubbo"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
        http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang-4.3.xsd
        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.3.xsd
        http://ttdubbo.oschina.net/schema/ttdubbo http://ttdubbo.oschina.net/schema/ttdubbo.xsd">

    <ttdubbo:application id="app1"  name="ttdubboTest" version="0.0.1"/>    
    <ttdubbo:registry id="reg1" address="192.168.1.101" port="80" />
    
</beans>

12：main方法

package com.imddy.ttdubbo;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.imddy.ttdubbo.springsupport.Application;
import com.imddy.ttdubbo.springsupport.Registry;

public class APP {

    public static void main(String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");

        Application application1 = (Application) context.getBean("app1");
        System.out.println(application1.toString());

        Registry registry1 = (Registry) context.getBean("reg1");
        System.out.println(registry1.toString());

        System.out.println("Hello World!");
    }

}

注：如果不成功，需要手动引入一下

13：打包后其它项目可以直接使用

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原文地址：https://www.cnblogs.com/feiyun126/p/7715934.html