从头认识Spring-2.7 自动检测Bean-过滤器<context:exclude-filter/>

Posted 李灵晖

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

1.domain

Person接口：

package com.raylee.my_new_spring.my_new_spring.ch02.topic_1_21;

public interface Person {

}

拳击手类： 

package com.raylee.my_new_spring.my_new_spring.ch02.topic_1_21;

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_21;

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故意没有使用任何标记bean的注解，而且我们再配置文件里面也不会显示标记bean


测试实体类：

package com.raylee.my_new_spring.my_new_spring.ch02.topic_1_21;

import org.springframework.stereotype.Component;

@Component
public class MyComponent implements Person {

}
在这个类里面我们标记了@Component注解，一会儿我们会使用过滤器排除这个注解的所有bean


2.测试类：

package com.raylee.my_new_spring.my_new_spring.ch02.topic_1_21;

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_21/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());
		System.out.println(applicationContext.containsBean("myComponent"));
	}
}

测试的最后面我们只是输出是否那个类已经生成对象


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_21">
		<context:include-filter type="assignable"
			expression="com.raylee.my_new_spring.my_new_spring.ch02.topic_1_21.Person" />
		<context:exclude-filter type="annotation"
			expression="org.springframework.stereotype.Component" />
	</context:component-scan>

</beans>

在配置文件里面：

（1）我们配置自动扫描<context:component-scan/>

（2）在自动扫描里面我们在配置<context:include-filter/>，然后type=“assignable”，这里的意思是，Person接口所派生出来的所有类，都自动注册bean

（3）还配置了<context:exclude-filter/>，所有被注解@Component标记的类我们都不自动注册


测试输出：

jack

mike

false


总结：这一章节我们主要介绍了过滤器<context:exclude-filter/>的使用方法。


目录：http://blog.csdn.net/raylee2007/article/details/50611627 

 

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