一，配置文件版
<?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">
<!-- 扫包 加入此配置后，会自动扫描com。dream下面中带有@Controller，@Service，@Repository，@Component-->
<!--<context:component-scan base-package="com.dream"></context:component-scan>-->
<bean id="student" class="com.dream.bean.Student">
<property name="age" value="18"></property>
<property name="name" value="lisi"></property>
</bean>
</beans> |
在配置文件中加入<context:component-scan base-package="com.dream"></context:component-scan>，spring容器在启动的时候就会自动扫描com.dream包下面所有带@Controller，@Service，@Repository，@Component注解的类，并加载到容器。
二，注解版
1，在Config类中加入
@ComponentScan(value = "com.dream")
package com.dream.config;
import com.dream.bean.Student;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
//配置类（等价原来的配置文件）
@Configuration
@ComponentScan(value = "com.dream")
public class BeansConfig {
//给容器中注册一个bean；类型为返回值类型，id默认是方法名作为id
@Bean
public Student student(){
return new Student("王五",28);
}
}
|
2，添加下面三个类
package com.dream.controller;
import org.springframework.stereotype.Controller;
@Controller
public class BookController {
}
|
package com.dream.service;
import org.springframework.stereotype.Service;
@Service
public class BookService {
}
|
package com.dream.dao;
import org.springframework.stereotype.Repository;
@Repository
public class BookDao {
}
|
3，在pom文件加入junit依赖
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency> |
4，测试类
package com.dream;
import com.dream.config.BeansConfig;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
public class IOCTest {
@Test
public void test1(){
ApplicationContext applicationContext = new AnnotationConfigApplicationContext(BeansConfig.class);
String[] beanDefinitionNames = applicationContext.getBeanDefinitionNames();
for(String bean:beanDefinitionNames){
System.out.println(bean);
}
}
}
|
5，测试结果 红色字段代表我们自己注入容器的类，绿色部分是spring启动时，spring中需要注入的部分
| org.springframework.context.annotation.internalConfigurationAnnotationProcessor org.springframework.context.annotation.internalAutowiredAnnotationProcessor org.springframework.context.annotation.internalRequiredAnnotationProcessor org.springframework.context.annotation.internalCommonAnnotationProcessor org.springframework.context.event.internalEventListenerProcessor org.springframework.context.event.internalEventListenerFactory beansConfig bookController bookDao bookService student |
6，测试 excludeFilters，配置类如下
package com.dream.config;
import com.dream.bean.Student;
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.stereotype.Controller;
import org.springframework.stereotype.Service;
//配置类（等价原来的配置文件）
@Configuration
@ComponentScan(value = "com.dream",excludeFilters = {
@ComponentScan.Filter(type=FilterType.ANNOTATION,classes={Controller.class, Service.class})//排除Controller和Service以外的其他需要注入的类
})
public class BeansConfig {
//给容器中注册一个bean；类型为返回值类型，id默认是方法名作为id
@Bean
public Student student(){
return new Student("王五",28);
}
}
|
结果中没有带@Controller和@Service的类
| org.springframework.context.annotation.internalConfigurationAnnotationProcessor org.springframework.context.annotation.internalAutowiredAnnotationProcessor org.springframework.context.annotation.internalRequiredAnnotationProcessor org.springframework.context.annotation.internalCommonAnnotationProcessor org.springframework.context.event.internalEventListenerProcessor org.springframework.context.event.internalEventListenerFactory beansConfig bookDao student |
7，测试 includeFilters，配置如下，使用includeFilters ，需要将useDefaultFilters 设置为false才生效
package com.dream.config;
import com.dream.bean.Student;
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.stereotype.Controller;
import org.springframework.stereotype.Service;
//配置类（等价原来的配置文件）
@Configuration
@ComponentScan(value = "com.dream",includeFilters = {
@ComponentScan.Filter(type=FilterType.ANNOTATION,classes={Controller.class, Service.class})//排除Controller和Service以外的其他需要注入的类
},useDefaultFilters = false)
public class BeansConfig {
//给容器中注册一个bean；类型为返回值类型，id默认是方法名作为id
@Bean
public Student student(){
return new Student("王五",28);
}
}
|
测试结果
| org.springframework.context.annotation.internalConfigurationAnnotationProcessor org.springframework.context.annotation.internalAutowiredAnnotationProcessor org.springframework.context.annotation.internalRequiredAnnotationProcessor org.springframework.context.annotation.internalCommonAnnotationProcessor org.springframework.context.event.internalEventListenerProcessor org.springframework.context.event.internalEventListenerFactory beansConfig bookController bookService student |
