spring注入属性时@Qualifier不起作用

[qq_17072973]

刚学spring就遇到一个奇怪的问题，在网上找了半天也没解决。。
这是我的demo，一个接口两个bean实现，再选择注入到含有该接口的service，代码如下:
beans.xml:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
                        http://www.springframework.org/schema/beans/spring-beans.xsd">
	
	<bean
		class="org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor" />

	<bean id="springHello" class="com.spring.service.impl.SpringHello"></bean>
	<bean id="mybatisHello" class="com.spring.service.impl.MybatisHello"></bean>

	<bean id="helloService" class="com.spring.service.HelloService"></bean>

</beans>

public class HelloService
{
	//   ??? @Qualifier不起作用
	@Autowired
	@Qualifier("springHello")
	Hello hello;
	
	public HelloService()
	{
		
	}
	
	//@Autowired
	
	public HelloService(Hello hello){
		this.hello = hello;
		System.out.println("auto-write by constructor");
	}
	
	public Hello getHello()
	{
		return hello;
	}
	
	//@Autowired
	public void setHello(Hello hello)
	{
		System.out.println("auto-write by type");
		this.hello = hello;
	}
	
}

如上，运行时报错

Caused by: org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type 'com.wjm.spring.service.Hello' available: expected single matching bean but found 2: springHello,mybatisHello

显然是@Qualifier注解没起作用吧，不知是哪里出了问题，麻烦给看看哪有问题，感激不尽！

[Buguanjia-Ssj]

引用 楼主 qq_17072973 的回复:

刚学spring就遇到一个奇怪的问题，在网上找了半天也没解决。。 这是我的demo，一个接口两个bean实现，再选择注入到含有该接口的service，代码如下: beans.xml:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
                        http://www.springframework.org/schema/beans/spring-beans.xsd">
	
	<bean
		class="org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor" />

	<bean id="springHello" class="com.spring.service.impl.SpringHello"></bean>
	<bean id="mybatisHello" class="com.spring.service.impl.MybatisHello"></bean>

	<bean id="helloService" class="com.spring.service.HelloService"></bean>

</beans>

public class HelloService
{
	//   ??? @Qualifier不起作用
	@Autowired
	@Qualifier("springHello")
	Hello hello;
	
	public HelloService()
	{
		
	}
	
	//@Autowired
	
	public HelloService(Hello hello){
		this.hello = hello;
		System.out.println("auto-write by constructor");
	}
	
	public Hello getHello()
	{
		return hello;
	}
	
	//@Autowired
	public void setHello(Hello hello)
	{
		System.out.println("auto-write by type");
		this.hello = hello;
	}
	
}

如上，运行时报错

Caused by: org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type 'com.wjm.spring.service.Hello' available: expected single matching bean but found 2: springHello,mybatisHello

显然是@Qualifier注解没起作用吧，不知是哪里出了问题，麻烦给看看哪有问题，感激不尽！

你可以看一下这个http://www.cnblogs.com/smileLuckBoy/p/5801678.html

[qq_17072973]

引用 1 楼 shansongjia 的回复:

[quote=引用 楼主 qq_17072973 的回复:] 刚学spring就遇到一个奇怪的问题，在网上找了半天也没解决。。 这是我的demo，一个接口两个bean实现，再选择注入到含有该接口的service，代码如下: beans.xml:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
                        http://www.springframework.org/schema/beans/spring-beans.xsd">
	
	<bean
		class="org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor" />

	<bean id="springHello" class="com.spring.service.impl.SpringHello"></bean>
	<bean id="mybatisHello" class="com.spring.service.impl.MybatisHello"></bean>

	<bean id="helloService" class="com.spring.service.HelloService"></bean>

</beans>

public class HelloService
{
	//   ??? @Qualifier不起作用
	@Autowired
	@Qualifier("springHello")
	Hello hello;
	
	public HelloService()
	{
		
	}
	
	//@Autowired
	
	public HelloService(Hello hello){
		this.hello = hello;
		System.out.println("auto-write by constructor");
	}
	
	public Hello getHello()
	{
		return hello;
	}
	
	//@Autowired
	public void setHello(Hello hello)
	{
		System.out.println("auto-write by type");
		this.hello = hello;
	}
	
}

如上，运行时报错

Caused by: org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type 'com.wjm.spring.service.Hello' available: expected single matching bean but found 2: springHello,mybatisHello

显然是@Qualifier注解没起作用吧，不知是哪里出了问题，麻烦给看看哪有问题，感激不尽！

你可以看一下这个http://www.cnblogs.com/smileLuckBoy/p/5801678.html[/quote] 谢啦，问题解决了，是配置文件上边那一堆网址的问题

[a13979053726]

是哪里的网址出错了？我也遇到了这个问题。

[qvp8]

factory.setAutowireCandidateResolver(new QualifierAnnotationAutowireCandidateResolver());