关键代码:
<!-- 定义一个bean --> <bean id="user1" class="com.shuoeasy.test.User" p:id="1001" p:name="说易事"></bean> <!-- 继承user1,通过“parent”属性实现 --> <bean id="user2" parent="user1"></bean> <!-- 定义抽象bean,也就是没有实例化过的bean,通过abstract属性实现 --> <bean id="user_abs" class="com.shuoeasy.test.User" abstract="true"></bean> <bean id="user3" parent="user_abs" p:id="1003" p:name="说易事"></bean>
详细:
User.java:
package com.shuoeasy.test; public class User { private int id; private String name; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } @Override public String toString() { return "User [id=" + id + ", name=" + name + "]"; } }
bean.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.xsd"> <!-- 定义一个bean --> <bean id="user1" class="com.shuoeasy.test.User" p:id="1001" p:name="说易事"></bean> <!-- 继承user1,通过“parent”属性实现 --> <bean id="user2" parent="user1"></bean> <!-- 定义抽象bean,也就是没有实例化过的bean,通过abstract属性实现 --> <bean id="user_abs" class="com.shuoeasy.test.User" abstract="true"></bean> <bean id="user3" parent="user_abs" p:id="1003" p:name="说易事"></bean> </beans>
Main.java:
package com.shuoeasy.test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class Main { public static void main(String[] args) { ApplicationContext ctx = new ClassPathXmlApplicationContext("bean.xml"); User user1 = (User) ctx.getBean("user1"); System.out.println("user1->" + user1); User user2 = (User) ctx.getBean("user2"); System.out.println("继承user1->" + user2); User user3 = (User) ctx.getBean("user3"); System.out.println("继承抽象bean->" + user3); } }
输出:
user1->User [id=1001, name=说易事]
继承user1->User [id=1001, name=说易事]
继承抽象bean->User [id=1003, name=说易事]