Question

我有一个template bean，它有一个嵌套的bean。嵌套bean有两个重要属性，一个对其他3个bean定义有效，但它们有一个在每个bean中都有变化的secong属性。

我的模板看起来像这样。一个没有课程的豆子。

<bean id="myBeanTemplate" abstract="true" scope="prototype">
    <property name="school">        
        <bean class="com.model.School" scope="prototype">
            <property name="status" value="true"/><!--is all the same for all the child beans..->
            /*address=?? the property which is change across the children beans.. the property to  be set*/
        </bean>
    </property>
 </bean>

这里我不设置addres属性只是因为它们在以下bean声明中有所不同，我想做的就是上面的bean模板和override the address property only。就像这样。

<bean id="myBeanForStudentsInSchool13" class="com.model.Students" parent="myBeanTemplate" scope="prototype">    
       here i want to set the address property to a value   
</bean>

<bean id="myBeanForStudentsInSchool23" class="com.model.Students" parent="myBeanTemplate" scope="prototype">    
       here i want to set the address property a different value    
</bean>

但是像嵌套的bean我不知道如何引用它......

更新

我被允许使用声明性配置......

非常感谢..

Answer 1

使用Java Config检查此解决方案。

学校模式：

public class School {

    private boolean status;
    private String address;

    // getters & setters

}

Bean模板：

public abstract class MyBeanTemplate {

    private School school;

    public School getSchool() {
        return school;
    }

    public void setSchool(School school) {
        this.school = school;
    }

}

学生班：

public class Students extends School {

}

Spring配置：

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class Config {

    @Bean
    public Students myBeanForStudentsInSchool13() {
        Students students = new Students();
        students.setAddress("myBeanForStudentsInSchool13");

        return students;
    }

    @Bean
    public Students myBeanForStudentsInSchool23() {
        Students students = new Students();
        students.setAddress("myBeanForStudentsInSchool23");

        return students;
    }
}

修改

对于XML配置，请检查此示例（注意子bean中的点）：

<bean id="myBeanTemplate" abstract="true" class="com.beans.MyBeanTemplate"> <property name="school"> <bean class="com.model.School"> <property name="status" value="true"/> </bean> </property> </bean> <bean id="myBeanForStudentsInSchool13" class="com.model.Students" parent="myBeanTemplate"> <property name="school.address" value="myBeanForStudentsInSchool13"/> </bean> <bean id="myBeanForStudentsInSchool23" class="com.model.Students" parent="myBeanTemplate"> <property name="school.address" value="myBeanForStudentsInSchool23"/> </bean>

您还可以在此处查看更详细的答案：spring - constructor injection and overriding parent definition of nested bean

Spring IOC嵌套bean在模板覆盖属性值中

1 个答案: