1.Spring註解01、組件註冊-@Configuration&@Bean給容器中註冊組件

一、原始的 xml配置方式

1.Spring pom 依賴

<!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context</artifactId>
    <version>4.1.2.RELEASE</version>
</dependency>

2.JavaBean

public class Person {
	private String name;
	
	private Integer age;

	public Person() {
	}

	public Person(String name, Integer age) {
		this.name = name;
		this.age = age;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public Integer getAge() {
		return age;
	}

	public void setAge(Integer age) {
		this.age = age;
	}

	@Override
	public String toString() {
		return "Person [name=" + name + ", age=" + age + "]";
	}
}

3.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"
    xmlns:p="http://www.springframework.org/schema/p"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans.xsd">


	<bean id="person" class="com.atguigu.bean.Person">
		<property name="name" value="張三" />
		<property name="age" value="10" />
	</bean>    
    
</beans>

4.測試類

import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.atguigu.bean.Person;

public class Test {

	public static void main(String[] args) {
		ClassPathXmlApplicationContext beans = new ClassPathXmlApplicationContext("beans.xml");
		Person p = (Person)beans.getBean("person");
		System.out.println(p);

	}

}

 

二、註解的形式

1. @Configuration替代beans.xml，@bean 替代<bean>

package com.atguigu.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.FilterType;
import org.springframework.context.annotation.ComponentScan.Filter;
import org.springframework.context.annotation.ComponentScans;

import com.atguigu.bean.Person;

//配置類==配置文件
@Configuration  //告訴Spring這是一個配置類

@ComponentScans(
		value = {
				@ComponentScan(value="com.atguigu",includeFilters = {
/*						@Filter(type=FilterType.ANNOTATION,classes={Controller.class}),
						@Filter(type=FilterType.ASSIGNABLE_TYPE,classes={BookService.class}),*/
						@Filter(type=FilterType.CUSTOM,classes={MyTypeFilter.class})
				},useDefaultFilters = false)	
		}
		)
//@ComponentScan  value:指定要掃描的包
//excludeFilters = Filter[] ：指定掃描的時候按照什麼規則排除那些組件
//includeFilters = Filter[] ：指定掃描的時候只需要包含哪些組件
//FilterType.ANNOTATION：按照註解
//FilterType.ASSIGNABLE_TYPE：按照給定的類型；
//FilterType.ASPECTJ：使用ASPECTJ表達式
//FilterType.REGEX：使用正則指定
//FilterType.CUSTOM：使用自定義規則
public class MainConfig {
	
	//給容器中註冊一個Bean;類型爲返回值的類型，id默認是用方法名作爲id
	@Bean("person")
	public Person person01(){
		return new Person("lisi", 20);
	}

}

2.測試調用

package com.atguigu;

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

import com.atguigu.bean.Person;
import com.atguigu.config.MainConfig;

public class MainTest {
	
	@SuppressWarnings("resource")
	public static void main(String[] args) {
		
		ApplicationContext applicationContext = new AnnotationConfigApplicationContext(MainConfig.class);
		Person bean = applicationContext.getBean(Person.class);
		System.out.println(bean);
		
		String[] namesForType = applicationContext.getBeanNamesForType(Person.class);
		for (String name : namesForType) {
			System.out.println(name);
		}
	
	}

}