为什么注释类为@Service不创建bean？ [英] why does annotate class as @Service do not create bean?

问题描述

我有这样的类：

@Service("userDetailsService") 
public class MyUserDetailsService implements UserDetailsService {
    ...

并尝试：

<authentication-manager>
    <authentication-provider user-service-ref="userDetailsService">
    </authentication-provider>
</authentication-manager>

我收到以下错误：

在设置
bean属性'userDetailsS​​ervice'时，无法解析对bean'userDetailsS​​ervice'的引用;嵌套异常是
org.springframework.beans.factory.NoSuchBeanDefinitionException：没有
bean被定义为'userDetailsS​​ervice'

Cannot resolve reference to bean 'userDetailsService' while setting bean property 'userDetailsService'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'userDetailsService' is defined

真的有必要声明bean吗？在这种情况下，如下所示：

Is it really necessary to declare bean? In that case like this:

<beans:bean id="myUserDetailsService" class="my.package.services.MyUserDetailsService" />

编辑

这是我的 security.xml 文件：

<beans:beans xmlns="http://www.springframework.org/schema/security"
    xmlns:beans="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:jdbc="http://www.springframework.org/schema/jdbc" 
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
           http://www.springframework.org/schema/jdbc
           http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd
           http://www.springframework.org/schema/security
           http://www.springframework.org/schema/security/spring-security-3.0.xsd">

    <http>
        <form-login login-page="/login/"
            authentication-failure-url="/fail/" />
        <logout logout-success-url="/" />
    </http>

    <context:annotation-config />
    <context:component-scan base-package="my.package" />

    <authentication-manager>
        <authentication-provider user-service-ref="myUserDetailsService">
            <!-- <password-encoder hash="md5" /> -->
        </authentication-provider>
    </authentication-manager>

</beans:beans>

导致：

匹配的通配符是严格的，但没有声明可以找到
元素的上下文：annotation-config'。

The matching wildcard is strict, but no declaration can be found for element 'context:annotation-config'.

推荐答案

您缺少上下文的模式位置。

You are missing schema location for context.

所以你的xml应该从以下开始：

So your xml should start with:

<beans:beans xmlns="http://www.springframework.org/schema/security"
    xmlns:beans="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:jdbc="http://www.springframework.org/schema/jdbc" 
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
           http://www.springframework.org/schema/jdbc
           http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd
           http://www.springframework.org/schema/security
           http://www.springframework.org/schema/security/spring-security-3.0.xsd
           http://www.springframework.org/schema/context 
           http://www.springframework.org/schema/context/spring-context-3.0.xsd">

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