• 从头认识Spring-2.3 注解装配-@autowired(3)-通过构造器方法注入


    这一章节我们来讨论一下注解装配的@autowired是如何通过set方法或者其它方法注入?

    1.domain

    蛋糕类:(不变)

    package com.raylee.my_new_spring.my_new_spring.ch02.topic_1_8;
    
    public class Cake {
    
    	private String name = "";
    
    	public String getName() {
    		return name;
    	}
    
    	public void setName(String name) {
    		this.name = name;
    	}
    
    }
    

    厨师类:

    package com.raylee.my_new_spring.my_new_spring.ch02.topic_1_8;
    
    import org.springframework.beans.factory.annotation.Autowired;
    
    public class Chief {
    	private Cake cake = null;
    
    	@Autowired
    	public Chief(Cake cake) {
    		this.cake = cake;
    	}
    
    	private String name = "";
    
    	public String getName() {
    		return name;
    	}
    
    	public Cake makeOneCake() {
    		System.out.println(getName() + " make " + cake.getName());
    		return cake;
    	}
    
    	public void setName(String name) {
    		this.name = name;
    	}
    
    }
    


    这里须要注意的是,这里通过@Autowired标签在构造器方法注入cake对象


    2.測试类:

    package com.raylee.my_new_spring.my_new_spring.ch02.topic_1_8;
    
    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/ch02/topic_1_8/ApplicationContext-test.xml" })
    public class ChiefTest {
    
    	@Autowired
    	private ApplicationContext applicationContext;
    
    	@Test
    	public void testChief() {
    		Chief jack = applicationContext.getBean(Chief.class);
    		jack.makeOneCake();
    	}
    }
    

    3.配置文件:(重点)

    <?

    xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p" 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" xmlns:util="http://www.springframework.org/schema/util" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-2.0.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="blueberryCheeseCake" class="com.raylee.my_new_spring.my_new_spring.ch02.topic_1_8.Cake" p:name="blueberryCheeseCake" scope="prototype" /> <bean id="jack" class="com.raylee.my_new_spring.my_new_spring.ch02.topic_1_8.Chief" p:name="jack" /> </beans>


    尽管我们上面这里定义了两个bean。可是jack那个bean不再须要通过<property/>标签来注入blueberryCheeseCake这个bean,而是通过Chief里面的@Autowired标签来完毕注入。


    測试输出:

    jack make blueberryCheeseCake


    总结:这一章节主要介绍@autowired是如何通过构造器方法注入。


    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/slgkaifa/p/7272767.html
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