Spring注入有继承关系的类（2）

被注入类的父类有相应的属性，Spring可以直接注入相应的属性，如下所例：
1.AClass类

package com.bijian.spring.test4;

public class AClass {

    private String a;
    private String b;
   
    public String getA() {
        return a;
    }
    public void setA(String a) {
        this.a = a;
    }
    public String getB() {
        return b;
    }
    public void setB(String b) {
        this.b = b;
    }
}

 

2.BClass类

package com.bijian.spring.test4;

public class BClass extends AClass {

    String c;

    public String getC() {
        return c;
    }

    public void setC(String c) {
        this.c = c;
    }

    String fn() {
        return getA() + getB() + c;
    }
}

 

3.AClass类对应的配置文件aclass4.xml

<?xml version="1.0" encoding="UTF-8"?>
  <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"
  "http://www.springframework.org/dtd/spring-beans.dtd">

<beans>
  <bean id="bean1" class="com.bijian.spring.test4.AClass">
      <property name="a">
          <value>1</value>
      </property>
      <property name="b">
          <value>2</value>
      </property>
  </bean>
</beans>

 

4.BClass类对应的配置文件bclass4.xml

<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"  
  "http://www.springframework.org/dtd/spring-beans.dtd">  
   
<beans>  
  <bean id="bean2" class="com.bijian.spring.test4.BClass">
    <property name="a">
          <value>5</value>
      </property>
      <property name="b">
          <value>6</value>
      </property>
      <property name="c">
          <value>3</value>
     </property>
  </bean>
</beans>

 

5.应用测试类Test.java

package com.bijian.spring.test4;

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

public class Test {

public static void main(String[] args) {
       
        ApplicationContext ac = new ClassPathXmlApplicationContext(new String[]{"bclass4.xml"});
       
        //得到子类，结果是：563
        BClass bclass = (BClass)ac.getBean("bean2");
        String res = bclass.fn();
        System.out.println(res);
    }
}