<bean abstract="true"> 即该bean不能被实例化

第一步：新建项目  SecondSpring

文件目录结构如下：

 

 第二步：导入spring相对应的jar包

过程略...

 

第三步： 新建类

TestAbstract.java

package com.xuzhiwen.spring8;

public class TestAbstract {
    public String name;
    
    public void setName(String name) {
        this.name = name;
    }

    @Override
    public String toString() {
        return "TestAbstract [name=" + name + "]";
    }
}

 

第四步： 新建spring配置文件

common.xml

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">
    
    <import resource="xmlfolder/app1.xml" />
    <import resource="xmlfolder/innerbean.xml" />
    <import resource="xmlfolder/singleton.xml" />
    <import resource="xmlfolder/annotation.xml" />
    <import resource="xmlfolder/gather.xml" />
    <import resource="xmlfolder/date.xml" />
    <import resource="xmlfolder/db.xml" />
    <import resource="xmlfolder/parent.xml" />
    
    <import resource="xmlFile/abstract.xml" />
    
</beans>    

abstract.xml

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:p="http://www.springframework.org/schema/p"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">
    
    <bean id="abs" class="com.xuzhiwen.spring8.TestAbstract">
        <property name="name" value="helloworld" />
    </bean>    
    
</beans>    

 

第五步：新建测试类

Test.java

package com.xuzhiwen.spring8;

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

public class Test {
    public static void main(String[] args) {
        ApplicationContext app = new ClassPathXmlApplicationContext("common.xml");
        TestAbstract test = (TestAbstract) app.getBean("abs");
        System.out.println(test);
    }
}

 

第六步：运行结果如下

 

 第七步：给abstract.xml 配置文件<bean>中添加 abstract属性

<bean id="abs" class="com.xuzhiwen.spring8.TestAbstract" abstract="true">
        <property name="name" value="helloworld" />
    </bean>    

 

 第八步： 再次运行测试代码，结果如下

Exception in thread "main" org.springframework.beans.factory.BeanIsAbstractException: Error creating bean with name 'abs': Bean definition is abstract
    at org.springframework.beans.factory.support.AbstractBeanFactory.checkMergedBeanDefinition(AbstractBeanFactory.java:1293)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:285)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
    at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1076)
    at com.xuzhiwen.spring8.Test.main(Test.java:9)

抛出异常