Spring 标签 @Configuration注解、@Bean注解以及配置自动扫描、bean作用域

最新推荐文章于 2025-08-24 15:22:07 发布

转载最新推荐文章于 2025-08-24 15:22:07 发布 · 137 阅读

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原文链接：https://my.oschina.net/ouyangtaohong/blog/1550777

文章标签：

#java #python

本文详细介绍了Spring框架中使用注解进行配置的方式，包括@Configuration、@Bean和@ComponentScan等注解的应用场景及如何替代传统的XML配置文件。

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Spring 启动时加载标签的类 AnnotationConfigApplicationContext，相对应的时xml的加载文件ClassPathXmlApplicationContext ，加载xml 文件方式参考：http://javapub.iteye.com/blog/751772

@Configuration
@Bean
@ComponentScan

1、@Configuration标注在类上，相当于把该类作为spring的xml配置文件中的<beans>，作用为：配置spring容器(应用上下文)

package com.test.spring.support.configuration;

@Configuration
public class TestConfiguration {
    public TestConfiguration(){
        System.out.println("spring容器启动初始化。。。");
    }
}

相当于

<?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" xmlns:jdbc="http://www.springframework.org/schema/jdbc"  
    xmlns:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:util="http://www.springframework.org/schema/util" xmlns:task="http://www.springframework.org/schema/task" xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
        http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-4.0.xsd
        http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.0.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd
        http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-4.0.xsd" default-lazy-init="false">


</beans>

直接看参考文档： http://blog.youkuaiyun.com/javaloveiphone/article/details/52182899

转载于:https://my.oschina.net/ouyangtaohong/blog/1550777