spring 自定义schema

朴灿烈づ我的快乐病毒、 2021-10-19 01:31 298阅读 0赞

扩展schema,定义自己的bean属性。。不错！

主要：

1，定义META-INF下.xsd文件，这里是people.xsd;定义spring.handlers;定义spring.schemas

2,定义namaspace解析类,这里是StudentNamespaceHandler

3,定义beanDefinition，这里是StudentBeanDefinitionParser

4,当然还有相关的javabean定义，这里是Student.java

详细代码：

**people.xsd**

<?xml version="1.0" encoding="UTF-8"?>
    <xsd:schema xmlns="http://www.luyee.com/bat/schema/people"
    	xmlns:xsd="http://www.w3.org/2001/XMLSchema" 
    	xmlns:beans="http://www.springframework.org/schema/beans"
    	targetNamespace="http://www.luyee.com/bat/schema/people"
    	elementFormDefault="qualified" 
    	attributeFormDefault="unqualified">
        <xsd:import namespace="http://www.springframework.org/schema/beans" />
        
    	<xsd:element name="student">
    	 <xsd:complexType>  
                <xsd:complexContent>  
                    <xsd:extension base="beans:identifiedType"> 
                     
                       	<xsd:attribute name="name"
    						type="xsd:string">
    						<xsd:annotation>
    							<xsd:documentation>
    								姓名 
    							</xsd:documentation>
    						</xsd:annotation>
    					</xsd:attribute> 
    					 
                       	<xsd:attribute name="age"
    						type="xsd:string">
    						<xsd:annotation>
    							<xsd:documentation>
    								年龄
    							</xsd:documentation>
    						</xsd:annotation>
    					</xsd:attribute>  
                       
                    </xsd:extension>  
                </xsd:complexContent>  
            </xsd:complexType>  
        </xsd:element>  
       </xsd:schema>

**spring.handlers;**

http\://www.luyee.com/bat/schema/people=com.luyee.bat.spring.StudentNamespaceHandler

**spring.schemas**

http\://www.luyee.com/bat/schema/people.xsd=META-INF/people.xsd

**StudentNamespaceHandler和StudentBeanDefinitionParser**

package com.luyee.bat.spring;
    
    import java.text.SimpleDateFormat;
    
    import org.springframework.beans.factory.support.BeanDefinitionBuilder;
    import org.springframework.beans.factory.xml.AbstractSingleBeanDefinitionParser;
    import org.springframework.beans.factory.xml.NamespaceHandlerSupport;
    import org.springframework.util.StringUtils;
    import org.w3c.dom.Element;
    
    public class StudentNamespaceHandler  extends NamespaceHandlerSupport {
    
    	public void init() {
    		registerBeanDefinitionParser("student", new StudentBeanDefinitionParser());  
    	}
    	
    	class StudentBeanDefinitionParser extends AbstractSingleBeanDefinitionParser{
    		 protected Class getBeanClass(Element element) {  
    		        return Student.class;  
    		    }  
    		  
    		    protected void doParse(Element element, BeanDefinitionBuilder bean) {  
    		        String name = element.getAttribute("name");  
    		        bean.addPropertyValue("name", name);  
    
    		        String age = element.getAttribute("age");  
    		        if (StringUtils.hasText(age)) {  
    		            bean.addPropertyValue("age", Integer.valueOf(age));  
    		        }  
    		    }  
    	}
    }

**JavaBean:Student**

package com.luyee.bat.spring;
    
    public class Student {
    	
    	private String name;
    	
    	private int age;
    
    	public String getName() {
    		return name;
    	}
    
    	public void setName(String name) {
    		this.name = name;
    	}
    
    	public int getAge() {
    		return age;
    	}
    
    	public void setAge(int age) {
    		this.age = age;
    	}
    	
    	
    
    }

**测试：applicationContex.xml（people:student就好比bean）**

<?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:people="http://www.luyee.com/bat/schema/people"  
        xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd  
        http://www.luyee.com/bat/schema/people http://www.luyee.com/bat/schema/people.xsd" >  
        <people:student id="student1" name="student1"  
            age="18" />  
            
        <people:student id="student2" name="student2"  
            age="20" />  
      
    </beans>

**StudentXsdTest.java**

package com.luyee.bat.spring;
    
      
    import org.springframework.context.ApplicationContext;  
    import org.springframework.context.support.ClassPathXmlApplicationContext;  
      
    public class StudentXsdTest {  
      
        public static void main(String[] args) {  
            ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");  
            Student student1 = (Student) ctx.getBean("student1");  
            Student student2 = (Student) ctx.getBean("student2");  
            System.out.println("name: " +student1.getName()+" age :" + student1.getAge());  
            System.out.println("name: " +student2.getName()+" age :" + student2.getAge());  
        }  
    }

**输出：**

八月 13, 2013 8:50:50 下午 org.springframework.context.support.AbstractApplicationContext prepareRefresh
    INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@46f7ba12: startup date [Tue Aug 13 20:50:50 CST 2013]; root of context hierarchy
    八月 13, 2013 8:50:50 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
    INFO: Loading XML bean definitions from class path resource [applicationContext.xml]
    八月 13, 2013 8:50:52 下午 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
    INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@25e9a396: defining beans [student1,student2]; root of factory hierarchy
    name: student1 age :18
    name: student2 age :20

**最后贴个文件结构**

![SouthEast][]

[SouthEast]: /images/20211018/9ab0352db21747499351cec3d99db303.png