一，spring中使用@Resource 和@Autowired自动装配bean

一，spring中使用@Resource 和@Autowired自动装配bean1，spring applicationContext.xml中配置

 

<?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:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:context="http://www.springframework.org/schema/context" xmlns:util="http://www.springframework.org/schema/util"
    xsi:schemaLocation="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
        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/util
        http://www.springframework.org/schema/util/spring-util.xsd">
    
    <context:annotation-config />
<bean id="helloWS" class="cn.hz.lly.impl.HelloImpl"/>
<bean id="hello" class=" cn.hz.lly.impl.TestRes" init-method="init"/>

 

2.java代码

 

 

public class TestRes {
	@Resource
	private IHello helloIml;
	public void init(){
		helloIml.sayHello("lvzi");
	}
}

 HelloImpl 略 呵呵。

可以实现自动装配bean了

 

3，默认情况带有@Resource，@Autowired 的都是必须的spring会自动匹配，找不到则报错

 

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'hello': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [cn.hz.lly.IHello] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@javax.annotation.Resource(shareable=true, mappedName=, description=, name=, type=class java.lang.Object, authenticationType=CONTAINER)}

 

可以使用：@Autowired(required=false) 设置，spring找不到匹配的bean时，不会报错。