从头认识Spring-2.7 自己主动检測Bean(2)-过滤器<context:include-filter/>

这一章节我们来讨论一下过滤器<context:include-filter/>的使用。

1.domain

Person接口:

package com.raylee.my_new_spring.my_new_spring.ch02.topic_1_20;

public interface Person {

}

拳击手类:

package com.raylee.my_new_spring.my_new_spring.ch02.topic_1_20;

import org.springframework.beans.factory.annotation.Value;

public class Fighter implements Person {

	@Value("mike")
	private String name = "";

	public String getName() {
		return name;
	}

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

}

厨师类:

package com.raylee.my_new_spring.my_new_spring.ch02.topic_1_20;

import org.springframework.beans.factory.annotation.Value;

public class Chief implements Person {

	@Value("jack")
	private String name = "";

	public String getName() {
		return name;
	}

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

}

在上面的类里面我们有益没有使用不论什么标记bean的注解,并且我们再配置文件中面也不会显示标记bean


2.測试类:

package com.raylee.my_new_spring.my_new_spring.ch02.topic_1_20;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = {
		"/com/raylee/my_new_spring/my_new_spring/ch02/topic_1_20/ApplicationContext-test.xml" })
public class ChiefTest {

	@Autowired
	private ApplicationContext applicationContext;

	@Test
	public void testChief() {
		Chief jack = applicationContext.getBean(Chief.class);
		System.out.println(jack.getName());
		Fighter mike = applicationContext.getBean(Fighter.class);
		System.out.println(mike.getName());
	}
}

3.配置文件(重点)

<?

xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:util="http://www.springframework.org/schema/util" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-2.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.1.xsd http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.0.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd"> <context:component-scan base-package="com.raylee.my_new_spring.my_new_spring.ch02.topic_1_20"> <context:include-filter type="assignable" expression="com.raylee.my_new_spring.my_new_spring.ch02.topic_1_20.Person" /> </context:component-scan> </beans>


在配置文件中面:

(1)我们配置自己主动扫描<context:component-scan/>

(2)在自己主动扫描里面我们在配置<context:include-filter/>,然后type=“assignable”,这里的意思是,Person接口所派生出来的全部类。都自己主动注冊bean

type的四种參数:

assignable-指定扫描某个接口派生出来的类

annotation-指定扫描使用某个注解的类

aspectj-指定扫描AspectJ表达式相匹配的类

custom-指定扫描自己定义的实现了org.springframework.core.type.filter.TypeFilter接口的类

regex-指定扫描符合正則表達式的类


4.使用场景

上面我们仅仅是演示了第一种,由于有些时候我们是没有源代码或者一个接口派生n多实现类的情况。这样的场景使用这个最为合适。


測试输出:

jack
mike


总结:这一章节我们主要介绍了过滤器<context:include-filter/>的用法与使用场景。


文件夹:http://blog.csdn.net/raylee2007/article/details/50611627 

我的github:https://github.com/raylee2015/my_new_spring


原文地址:https://www.cnblogs.com/zsychanpin/p/7197691.html