Spring之自动配置

自动配置也叫自动注入，前一篇文章中提到的java配置方式，对于所有要使用的类都需要一个一个的配置。这样就显得很麻烦，我们可以通过自动配置来简化Bean的配置。自动配置需要使用到如下几个注解

StudentBean类

package com.zhouym.javabean;

public class StudenBean {
	private int id;
	private String name;
	private int age;
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	@Override
	public String toString() {
		return "StudenBean [id=" + id + ", name=" + name + ", age=" + age + "]";
	}
	
	
}

xml文件

<?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:p="http://www.springframework.org/schema/p"
 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-4.3.xsd">
	<!-- 开启注解，扫描配置路径 -->
	<context:component-scan base-package="com.zhouym.javabean"/>
	<!-- 可以扫描多个包名，用逗号隔开即可 ,这里需注意的是包名路径，而不是类路径，书写的时候需要注意下-->
	<!-- <context:component-scan base-package="com.zhouym.javabean,com.zhouym.userbean"/> -->
 </beans>

测试类

package com.zhouym.javabean;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class AutoTest {

	public static void main(String[] args) {
		ApplicationContext ac = new ClassPathXmlApplicationContext("ApplicationContext.xml");
		StudenBean sb = ac.getBean(StudenBean.class);
		System.out.println(sb);

	}

}

结果如下