Spring 的IoC使用示例3

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下面来展示一个在Spring中把相同的部分提取出来配置好，可以被多个类继承而注入到它们的引用里。

1.程序的总体结构图：

2_1. bean1.java的代码如下：

package com.my_spring;public class Bean1 {private Bean2 bean2;private Bean3 bean3;private Bean4 bean4;public Bean2 getBean2() {return bean2;}public void setBean2(Bean2 bean2) {this.bean2 = bean2;}public Bean3 getBean3() {return bean3;}public void setBean3(Bean3 bean3) {this.bean3 = bean3;}public Bean4 getBean4() {return bean4;}public void setBean4(Bean4 bean4) {this.bean4 = bean4;}}

2_2. bean2.java的代码如下：

package com.my_spring;public class Bean2 {private int id;private String name;private String password;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;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}}

2_3. bean3.java的代码如下：

package com.my_spring;public class Bean3 {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;}}

2_4. bean4.java的代码如下：

package com.my_spring;public class Bean4 {private int age;public int getAge() {return age;}public void setAge(int age) {this.age = age;}}

3.测试类InjectionTest.java的代码如下：

package com.my_spring;import org.springframework.beans.factory.BeanFactory;import org.springframework.context.support.ClassPathXmlApplicationContext;import junit.framework.TestCase;public class InjectionTest extends TestCase {BeanFactory factory;@Overrideprotected void setUp() throws Exception {factory = new ClassPathXmlApplicationContext("applicationContext.xml");}public void testInjection() {Bean1 bean1 = (Bean1)factory.getBean("bean1");System.out.println("bean1.bean2.id=" + bean1.getBean2().getId());System.out.println("bean1.bean2.name=" + bean1.getBean2().getName());System.out.println("bean1.bean2.password=" + bean1.getBean2().getPassword());System.out.println("bean1.bean3.id=" + bean1.getBean3().getId());System.out.println("bean1.bean3.id=" + bean1.getBean3().getName());System.out.println("bean1.bean4.age=" + bean1.getBean4().getAge());}}

4.Spring的配置文件applicationContext.xml的代码如下：

<?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"      xmlns:context="http://www.springframework.org/schema/context"      xmlns:aop="http://www.springframework.org/schema/aop"       xmlns:tx="http://www.springframework.org/schema/tx"      xmlns:dwr="http://www.directwebremoting.org/schema/spring-dwr"      xsi:schemaLocation="http://www.springframework.org/schema/beans       http://www.springframework.org/schema/beans/spring-beans-3.2.xsd      http://www.springframework.org/schema/context       http://www.springframework.org/schema/context/spring-context-3.2.xsd      http://www.springframework.org/schema/aop      http://www.springframework.org/schema/aop/spring-aop-3.2.xsd      http://www.springframework.org/schema/tx      http://www.springframework.org/schema/tx/spring-tx-3.2.xsd"><bean id="bean1" class="com.my_spring.Bean1"><property name="bean2" ref="bean2" /><property name="bean3"><ref bean="bean3"/></property><property name="bean4" ref="bean4" /></bean><bean id="bean2" class="com.my_spring.Bean2"><property name="id" value="1111" /><property name="name"><value>木星人</value></property><property name="password" value="123" /></bean><bean id="bean3" class="com.my_spring.Bean3"><property name="id" value="1111" /><property name="name"><value>木星人</value></property></bean><!-- bean2和bean3可以通过提取共有属性使用下面注释部分的形式来表示 --><!-- <bean id="beanAbstract" abstract="true"><property name="id" value="1111" /><property name="name"><value>木星人</value></property></bean><bean id="bean2" class="com.my_spring.Bean2" parent="beanAbstract"><property name="password" value="123" /></bean><bean id="bean3" class="com.my_spring.Bean3" parent="beanAbstract" /> --><bean id="bean4" class="com.my_spring.Bean4"><property name="age" value="22" /></bean></beans>

5.程序运行结果截图:

下面提供个Spring framework下载地址
点击打开Spring下载链接

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