• 从头认识Spring-1.9 内部类注入Bean


    这一章节我们来讨论一下内部类注入Bean。

    1.domain

    蛋糕类:(跟前一章节的一样)

    package com.raylee.my_new_spring.my_new_spring.ch01.topic_1_9;
    
    public class Cake {
    
    	private final int id = index++;
    
    	private static int index = 0;
    
    	private String name = "";
    
    	private double size = 0;
    
    	public String getName() {
    		return name;
    	}
    
    	public void setName(String name) {
    		this.name = name;
    	}
    
    	public double getSize() {
    		return size;
    	}
    
    	public void setSize(double size) {
    		this.size = size;
    	}
    
    	public int getId() {
    		return id;
    	}
    
    	@Override
    	public String toString() {
    		return "create the cake,its id:" + id + ", size:" + size + " inch ,name:" + name;
    	}
    }
    


    厨师类:(基本没有变化)

    package com.raylee.my_new_spring.my_new_spring.ch01.topic_1_9;
    
    public class Chief {
    
    	private Cake cake = null;
    
    	public Cake getCake() {
    		return cake;
    	}
    
    	private String name = "";
    
    	public Chief(String name) {
    		this.name = name;
    	}
    
    	public Chief(String name, Cake cake) {
    		this.name = name;
    		this.cake = cake;
    	}
    
    	public String getName() {
    		return name;
    	}
    
    	public void setName(String name) {
    		this.name = name;
    	}
    
    	public void setCake(Cake cake) {
    		this.cake = cake;
    	}
    
    	private final int id = index++;
    
    	public int getId() {
    		return id;
    	}
    
    	private static int index = 0;
    
    	public Cake makeOneCake() {
    		return cake;
    	}
    
    }
    


     

    測试类:

    package com.raylee.my_new_spring.my_new_spring.ch01.topic_1_9;
    
    import org.junit.Test;
    import org.junit.runner.RunWith;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.context.ApplicationContext;
    import org.springframework.test.context.ContextConfiguration;
    import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
    
    @RunWith(SpringJUnit4ClassRunner.class)
    @ContextConfiguration(locations = {
    		"/com/raylee/my_new_spring/my_new_spring/ch01/topic_1_9/ApplicationContext-test.xml" })
    public class ChiefTest {
    
    	@Autowired
    	private ApplicationContext applicationContext;
    
    	@Test
    	public void testChief() {
    		Chief chief = applicationContext.getBean(Chief.class);
    		System.out.println("chief name:" + chief.getName());
    		System.out.println(chief.getName() + " make a cake ,cake's name :" + chief.makeOneCake());
    	}
    }
    


    2.配置文件

    以下是通过属性注入内部类的配置文件

    <?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
    	xmlns:context="http://www.springframework.org/schema/context"
    	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tx="http://www.springframework.org/schema/tx"
    	xmlns:aop="http://www.springframework.org/schema/aop"
    	xsi:schemaLocation="
            http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
    		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd
    		http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd
    		http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.1.xsd
    		http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.0.xsd
    		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
           http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
    
    	<bean id="chief"
    		class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_9.Chief">
    		<constructor-arg value="jack" />
    		<property name="cake">
    			<bean class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_9.Cake">
    				<property name="name" value="jack's own cake" />
    				<property name="size" value="9" />
    			</bean>
    		</property>
    	</bean>
    </beans>
    


    注意:我们内部类注入,配置文件中面的cake是不带id的,并且。他不能为其它的Bean所公用。

    以下是通过构造器注入内部类的配置文件:

    <?

    xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.1.xsd http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.0.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd"> <bean id="chief" class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_9.Chief"> <constructor-arg value="jack" /> <constructor-arg> <bean class="com.raylee.my_new_spring.my_new_spring.ch01.topic_1_9.Cake"> <property name="name" value="jack's own cake" /> <property name="size" value="9" /> </bean> </constructor-arg> </bean> </beans>


    大家须要注意的是。我们上面的配置文件配置Bean的时候配置了两个属性,因此我们的构造器里面,必须存在这两个属性值,不然就会抛异常。

    总结:这一章节主要介绍内部类注入Bean的形式和注意点。

    文件夹:http://blog.csdn.net/raylee2007/article/details/50611627 

     

    我的github:https://github.com/raylee2015/my_new_spring


     

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  • 原文地址:https://www.cnblogs.com/wzzkaifa/p/7110515.html
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