写了好几次了，结果一段时间之后就忘记了自己有写好的example，但是最后还是决定重新写一遍，把这个步骤记录下来
首先看整个项目结构
从transaction.xml开始，虽然图上报错了，实际上运行并没有问题，IDE功能的不完善吧。
其中声明了sb命名空间，并且schemaLocation中写明了schema地址是http://www.springbank.com/schema/springbank.xsd
<?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:context="http://www.springframework.org/schema/context"
xmlns:sb="http://www.springbank.com/schema/springbank"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
http://www.springbank.com/schema/springbank http://www.springbank.com/schema/springbank.xsd
">
<!-- 交易处理器扫描并实例化 -->
<context:component-scan base-package="com.springbank.portal.controller"/>
<sb:transaction id="testTransaction" action="testAction" template="noTemplate"></sb:transaction>
</beans>
显然不会真的去http://www.springbank.com/schema/springbank.xsd寻找xsd，spring实际上是从spring.schemas文件里去寻找真正的地址，我这个example项目中，spring.schemas文件只有一行：
http\://www.springbank.com/schema/springbank.xsd=META-INF/schema/springbank.xsd
springbank.xsd的内容是
<?xml version="1.0" encoding="UTF-8"?>
<schema
xmlns="http://www.w3.org/2001/XMLSchema" targetNamespace="http://www.springbank.com/schema/springbank"
xmlns:op="http://www.springbank.com/schema/springbank" elementFormDefault="qualified">
<element name="transaction">
<complexType>
<attribute name="id" type="string" use="required"/>
<attribute name="action" type="string" use="required"/>
<attribute name="template" type="string" use="required"/>
</complexType>
</element>
<element name="template" />
<element name="action">
<complexType>
<attribute name="id" type="string" use="required"/>
<attribute name="class" type="string" use="required"/>
</complexType>
</element>
</schema>
schema的声明这个步骤就算完成了。接下来是要配置这个标签的解析类，这个配置在spring.handlers中完成：
http\://www.springbank.com/schema/springbank=com.demo.springtag.support.SpringbankNamespaceHandlerSupport
SpringbankNamespaceHandlerSupport类:
package com.demo.springtag.support;
import org.springframework.beans.factory.xml.NamespaceHandlerSupport;
public class SpringbankNamespaceHandlerSupport extends NamespaceHandlerSupport {
@Override
public void init() {
registerBeanDefinitionParser("transaction", new TagTransactionBeanDefinitionParser());
}
}
TagTransactionBeanDefinitionParser类
package com.demo.springtag.support; import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.xml.AbstractSingleBeanDefinitionParser;
import org.springframework.util.StringUtils;
import org.w3c.dom.Element; /**
* @author wangxin
* @contact 408657544@qq.com
* @date Jul 11, 2017
* @Description:用于解析transaction标签
*/
public class TagTransactionBeanDefinitionParser extends AbstractSingleBeanDefinitionParser {
private final Logger log = LoggerFactory.getLogger(getClass()); @Override
protected Class<?> getBeanClass(Element element) {
return Transaction.class;
}
protected void doParse(Element element, BeanDefinitionBuilder bean) {
String id = element.getAttribute("id");
String action = element.getAttribute("action");
String template = element.getAttribute("template"); if (StringUtils.hasText(id)) {
bean.addPropertyValue("id", id);
}
if (StringUtils.hasText(action)) {
bean.addPropertyValue("action", action);
}
if (StringUtils.hasText(template)) {
bean.addPropertyValue("template", template);
}
}
}
Transaction类
package com.demo.springtag.support;
public class Transaction {
private String id;
private String template;
private String action;
public Transaction() {
System.out.println("Bean Transaction have been created: "+toString());
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getTemplate() {
return template;
}
public String getAction() {
return action;
}
public void setAction(String action) {
this.action = action;
}
public void setTemplate(String template) {
this.template = template;
}
@Override
public String toString() {
return "Transaction [id=" + id + ", template=" + template + "]";
}
}
最后是测试类:
public class Main {
public static void main(String[] args) {
ApplicationContext context = new ClassPathXmlApplicationContext("classpath:transaction.xml");
Transaction transaction = (Transaction)context.getBean("testTransaction");
System.out.println(transaction.getTemplate());
}
}
运行结果：