Spring Bean继承
通过使用
bean 的
parent 属性，我们可以指定Bean之间的继承关系。在这种情况下，父bean的值将被继承到当前bean。
让我们看一下继承bean的简单示例。
Employee.java
此该类包含三个属性，三个构造函数和用于显示值的show()方法。
package com.lidihuo;
public class Employee {
private int id;
private String name;
private Address address;
public Employee() {}
public Employee(int id, String name) {
super();
this.id = id;
this.name = name;
}
public Employee(int id, String name, Address address) {
super();
this.id = id;
this.name = name;
this.address = address;
}
void show(){
System.out.println(id+" "+name);
System.out.println(address);
}
}
Address.java
package com.lidihuo;
public class Address {
private String addressLine1,city,state,country;
public Address(String addressLine1, String city, String state, String country) {
super();
this.addressLine1 = addressLine1;
this.city = city;
this.state = state;
this.country = country;
}
public String toString(){
return addressLine1+" "+city+" "+state+" "+country;
}
}
applicationContext.xml
<?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:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
<bean id="e1" class="com.lidihuo.Employee">
<constructor-arg value="101"></constructor-arg>
<constructor-arg value="Sachin"></constructor-arg>
</bean>
<bean id="address1" class="com.lidihuo.Address">
<constructor-arg value="21,Lohianagar"></constructor-arg>
<constructor-arg value="Ghaziabad"></constructor-arg>
<constructor-arg value="UP"></constructor-arg>
<constructor-arg value="USA"></constructor-arg>
</bean>
<bean id="e2" class="com.lidihuo.Employee" parent="e1">
<constructor-arg ref="address1"></constructor-arg>
</bean>
</beans>
Test.java
此类从applicationContext.xml文件获取Bean并调用show方法。
package com.lidihuo;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
public class Test {
public static void main(String[] args) {
Resource r=new ClassPathResource("applicationContext.xml");
BeanFactory factory=new XmlBeanFactory(r);
Employee e1=(Employee)factory.getBean("e2");
e1.show();
}
}
