一个简单的自定义标签
<mytag:user id="user" username="test0001" password="test-123456"/>
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User.class
public class User { private String username; private String password;
public String getUsername() { return username; }
public void setUsername(String username) { this.username = username; }
public String getPassword() { return password; }
public void setPassword(String password) { this.password = password; }
@Override public String toString() { return "User{" + "username='" + username + '\'' + ", password='" + password + '\'' + '}'; }}
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META_INF/user.xsd
<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" targetNamespace="http://www.void.com/schema/mytag-user" elementFormDefault="qualified"> <xsd:element name="user"> <xsd:complexType> <xsd:attribute name="id" type="xsd:string"/> <xsd:attribute name="username" type="xsd:string"/> <xsd:attribute name="password" type="xsd:string"/> </xsd:complexType> </xsd:element></xsd:schema>
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UserBeanDefinitionParser.class
public class UserBeanDefinitionParser extends AbstractSingleBeanDefinitionParser {
@Override protected Class<?> getBeanClass(Element element) { return User.class; }
@Override protected void doParse(Element element, BeanDefinitionBuilder builder) { String username = element.getAttribute("username"); String password = element.getAttribute("password"); if (StringUtils.hasText(username)) builder.addPropertyValue("username", username); if (StringUtils.hasText(password)) builder.addPropertyValue("password", password); }}
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可继承 PropertyPlaceholderBeanDefinitionParser 或者 AbstractSingleBeanDefinitionParser。
PropertyPlaceholderBeanDefinitionParser 是 AbstractSingleBeanDefinitionParser 的子类，其中的 doParse 方法中多添加了一些通用的属性设置。
MytagUserNamespaceHandler.class
public class MytagUserNamespaceHandler extends NamespaceHandlerSupport { @Override public void init() { registerBeanDefinitionParser("user", new UserBeanDefinitionParser()); }}
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META-INF/spring.handlers
www.void.com 可以随意编写
http\://www.void.com/schema/mytag-user=com.debug.selftag.MytagUserNamespaceHandler
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META-INF/spring.schemas
http\://www.void.com/schema/mytag-user.xsd=META-INF/user.xsd
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applicationContext.xml
添加两行内容
xmlns:mytag="http://www.void.com/schema/mytag-user"
http://www.void.com/schema/mytag-user http://www.void.com/schema/mytag-user.xsd
<?xml version="1.0" encoding="UTF-8"?><beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.springframework.org/schema/beans" xmlns:mytag="http://www.void.com/schema/mytag-user" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.void.com/schema/mytag-user http://www.void.com/schema/mytag-user.xsd">
<mytag:user id="user" username="test0001" password="test-123456"/>
</beans>
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测试
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml"); User user = (User) context.getBean("user"); System.out.println(user);
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输出： User{username='test0001', password='test-123456'}
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