spring扫描_include-filter_me

最新推荐文章于 2023-07-04 22:11:30 发布

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本文详细介绍了Spring框架中不同配置方式的应用，包括默认配置、自定义过滤规则等，通过具体示例展示了如何灵活配置组件扫描，以满足不同的项目需求。

maven:

<!-- spring -->
        <dependency>
            <groupId>aopalliance</groupId>
            <artifactId>aopalliance</artifactId>
            <version>1.0</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>3.2.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>3.2.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>3.2.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>3.2.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-expression</artifactId>
            <version>3.2.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>3.2.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>3.2.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>3.2.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>3.2.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>3.2.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>cglib</groupId>
            <artifactId>cglib-nodep</artifactId>
            <version>3.1</version>
        </dependency>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.6.9</version>
        </dependency>

测试项目结构

spring扫描

application.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:aop="http://www.springframework.org/schema/aop"
    xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:osgi="http://www.springframework.org/schema/osgi"
    xsi:schemaLocation="http://www.springframework.org/schema/osgi http://www.springframework.org/schema/osgi/spring-osgi.xsd
            http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
            http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
            http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
            http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd"
    default-autowire="byName">
    <tx:annotation-driven />
    <context:component-scan base-package="com" use-default-filters="false">
        <context:include-filter type="regex"
            expression="com\.wanba\..*\.service\..*" />
        <context:include-filter type="regex"
            expression="com\.wanba\..*\.dao\..*" />

    </context:component-scan>

</beans>

Test.java

package com;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.wanba.TestService;
import com.wanba.service.WanbaService;
import com.wanba.user.service.UserService;

public class Test
{
    @SuppressWarnings("resource")
    public static void main(String[] args)
    {
        ClassPathXmlApplicationContext classPathXmlApplicationContext = new ClassPathXmlApplicationContext("classpath:/applicationContext.xml");

        Object bean = classPathXmlApplicationContext.getBean("userService");
        UserService service = (UserService)bean;
        service.serviceuser();
        System.out.println("-----------------------------");

        Object bean2 = classPathXmlApplicationContext.getBean("wanbaService");
        WanbaService wanbaService = (WanbaService)bean2;
        wanbaService.serviceWanba();
        System.out.println("-----------------------------");

        Object bean3 = classPathXmlApplicationContext.getBean("testService");
        TestService service3 = (TestService)bean3;
        service3.service();

    }
}

通过修改各种配置，注解。小结如下：
1.采用默认配置use-default-filters=”true”默认为true

<tx:annotation-driven />
<context:component-scan base-package="com" use-default-filters="true">  
</context:component-scan>

此时spring只会扫描包下的类且是使用诸如@Service、@Repository、@Component之类的注解符号注解过了的。其他的类则扫描不到。此时若是添加扫描规则，起作用的是：在扫描规则下的包不需要写注解符号。

2.use-default-filters=”true”设置为false

<tx:annotation-driven />
<context:component-scan base-package="com" use-default-filters="false"> 
</context:component-scan>

此时啥也扫描不到，其实是扫描没工作。这里的意思是在com包下只扫描自定义的路径下的类。

3.use-default-filters=”true”设置为false，添加自定义规则

<tx:annotation-driven />
<context:component-scan base-package="com" use-default-filters="false"> 
    <context:include-filter type="regex" expression="com.wanba.user.service.*" />
    <context:include-filter type="regex" expression="com.wanba.user.dao.*" /> 
</context:component-scan>

此时com.wanba.user.service和com.wanba.user.dao包下的类，无论是不是有注解符号都可以被扫描到。其他的包下不会去扫描。

4.use-default-filters=”true”设置为false，添加自定义规则扫描多个包

<tx:annotation-driven />
<context:component-scan base-package="com" use-default-filters="false"> 
    <context:include-filter type="regex" expression="com.wanba.*.service.*" />
    <context:include-filter type="regex" expression="com.wanba.*.dao.*" /> 
</context:component-scan>

此时com.wanba包下的service和dao或者子包下的service和dao包下的类无论是否添加注解都会被扫描到。不在这个范围内不会被扫描。

5.use-default-filters=”true”设置为false，添加自定义规则扫描多个包，添加剔除扫描范围的包

<tx:annotation-driven />
<context:component-scan base-package="com" use-default-filters="false"> 
    <context:include-filter type="regex"
            expression="com.*" />
        <context:exclude-filter type="regex"
            expression="com.wanba.user.*" />
</context:component-scan>