1.Spring的注解开发

注解开发流程:
1)Spring的注解开发除了四个核心jar还需要aop包的支持,引入pring-aop-4.3.2.RELEASE.jar.
2)在配置文件中引入约束schema.
3)开启注解扫描.

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1.注解约束schema:spring-context.xsd配置.

在配置文件中需要引入注解的约束:

   http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd

原文如下:

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41.2.8 the context schema

The context tags deal with ApplicationContext configuration that relates to plumbing- that is, not usually beans that are important to an end-user but rather beans that doa lot of grunt work in Spring, such as BeanfactoryPostProcessors. The followingsnippet references the correct schema so that the tags in the context namespace areavailable to you.

<?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:context="http://www.springframework.org/schema/context" xsi:schemaLocation="        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <!-- bean definitions here --></beans>

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2.开启注解扫描:

    <!-- 开启注解扫描         到包里面扫描类、方法、属性上面是否有注解 (开发一般建议使用)    -->    <context:component-scan base-package="cn.com.yves"></context:component-scan>    <!--         只扫描属性上面的注解      -->    <!-- <context:annotation-config></context:annotation-config> -->

注意:

• 1.在类上使用注解的时候,默认的是调用的无参构造方法来实例化对象的.
• 2如果是多个不同的包可以在配置多个值在base-package属性中,比如配置扫描cn.com.yves和cn.com.utils包下java类,中间用逗号, 隔开<context:component-scan base-package="cn.com.yves,cn.com.utils"></context:component-scan>