对象图导航注入支持

最新推荐文章于 2026-01-01 22:10:03 发布

转载最新推荐文章于 2026-01-01 22:10:03 发布 · 724 阅读

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本文通过一个具体的Spring框架依赖注入示例，展示了如何在一个复杂的对象图中进行依赖的配置与注入，包括不同类型的集合属性（如List、Map和Properties）及数组的注入方式。

package com.action;

public class NavigationA {
	private NavigationB navigationB;

	public NavigationB getNavigationB() {
		return navigationB;
	}

	public void setNavigationB(NavigationB navigationB) {
		this.navigationB = navigationB;
	}
	
}

package com.action;

import java.util.List;
import java.util.Map;
import java.util.Properties;

public class NavigationB {
	private NavigationC navigationC;
	private List<NavigationC> list;
	private Properties properties;
	private NavigationC[] array = new NavigationC[1];
	private Map<String,NavigationC> map;
	//下面是一些set get
}

package com.action;

public class NavigationC {
	public void sayNavigation(){
		System.out.println("===========");
	}
}

	<bean id="c" class="com.action.NavigationC"></bean>
	<bean id="b" class="com.action.NavigationB">
		<property name="list"><list></list></property>
		<property name="map"><map></map></property>
		<property name="properties"><props></props></property>
	</bean>
	<bean id="a" class="com.action.NavigationA">
		<!-- 首先对NavigationB进行注入，以免其为空 -->
		<property name="navigationB" ref="b"></property>
		<!-- 对象图导航注入 -->
		<property name="navigationB.navigationC" ref="c"></property>
		<!-- 对list的注入 -->
		<property name="navigationB.list[0]" ref="c"></property>
		<!-- 对map的注入 -->
		<property name="navigationB.map[key]" ref="c"></property>
		<!-- 对property的注入 -->
		<property name="navigationB.properties[0]" ref="c"></property>
		<property name="navigationB.properties[1]" ref="c"></property>
		<!-- 对array的注入 -->
		<property name="navigationB.array[0]" ref="c"></property>
	</bean>

package com.action;

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

public class TestNavigation {
	public static void main(String[] args) {
		ApplicationContext ac = new ClassPathXmlApplicationContext("com/resource/navigationBeanInject.xml");
		NavigationA navigationA = ac.getBean("a",NavigationA.class);
		navigationA.getNavigationB().getNavigationC().sayNavigation();
		navigationA.getNavigationB().getArray()[0].sayNavigation();
		navigationA.getNavigationB().getList().get(0).sayNavigation();
		navigationA.getNavigationB().getMap().get("key").sayNavigation();
		((NavigationC)(navigationA.getNavigationB().getProperties().get("1"))).sayNavigation();
	}
}

pass:写到最后发现写到，一般不用了解即可……