spring 的依赖注入简单和复杂类型

爱被打了一巴掌 2022-05-22 05:05 208阅读 0赞

一、XML配置

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xmlns="http://www.springframework.org/schema/beans" 
    xmlns:p="http://www.springframework.org/schema/p"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans-4.2.xsd ">
    
    			
    		<bean name="user" class="com.lzp.bean.User">
    			
    			<property name="name" value="jack"></property>
    			<property name="age" value="21"></property>
    			
    			<property name="maserati" ref="maseratis"></property>
    		</bean>
    		
    		
    		<bean name="maseratis" class="com.lzp.bean.Maserati">
    			<property name="name" value="宝马"></property>
    			<property name="color" value="钻石"></property>
    		</bean>
    		
    		
    		
    		<bean name="user2" class="com.lzp.bean.User">
    			<constructor-arg name="name" value="007" index="1" type="java.lang.Integer"></constructor-arg>
    			<constructor-arg name="age" value="17" index="0"></constructor-arg>
    			<constructor-arg name="maserati" ref="maseratis" index="2"></constructor-arg>
    		</bean>
    		
    		
    		<bean name="user3" class="com.lzp.bean.User" p:name="tom" p:age="177" p:maserati-ref="maseratis">
    		
    		</bean>
    		
    		<bean name="user4" class="com.lzp.bean.User">
    										
    			<property name="name" value="#{user.name}"></property>
    										
    			<property name="age" value="#{user2.age}"></property>
    			<property name="maserati"  ref="maseratis"></property>
    		</bean>
    		
    		
    		
    		<bean name="coll" class="com.lzp.bean.CollectionBean">
    			
    			
    			<property name="arr">
    				<array>
    					<value>brucelee</value>
    					<value>32</value>
    					<ref bean="user"/>
    				</array>
    			</property>
    			
    			
    			
    				<property name="list">
    					<list>
    						<value>mark</value>
    						<value>11</value>
    						<ref bean="user2"/>
    					</list>
    				</property>
    				
    				
    				<property name="map">
    					<map>
    						
    						<entry key="name" value="tom"></entry>
    						
    						<entry key="user" value-ref="user2"></entry>
    						
    						<entry key-ref="user" value-ref="user3"></entry>
    					</map>
    				</property>
    				
    			
    			<property name="pro">
    				<props>
    					<prop key="lzp">lee</prop>
    					<prop key="tom">mark</prop>
    					<prop key="lee">brucelee</prop>
    				</props>
    			</property>
    		</bean>
    </beans>

二、测试类

package com.lzp.injection;
    
    import org.junit.jupiter.api.Test;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    
    import com.lzp.bean.CollectionBean;
    import com.lzp.bean.User;
    
    public class Demo {
    		//创建方式一，空参构造创建
    		@Test
    		public void test() {
    		//1、创建容器对象
    		ApplicationContext app = new ClassPathXmlApplicationContext("com/lzp/injection/applicationContext.xml");
    		//2、向容器“要”user对象
    		CollectionBean bean = (CollectionBean) app.getBean("coll"); 
    		//打印user对象
    		System.out.println(bean);
    	}
    
    }