在這個Spring自動組件掃描的教程，您已經瞭解如何使Spring自動掃描您的組件。在這篇文章中，我們將展示如何使用組件篩檢程式自動掃描過程。
1.過濾組件 - 包含
參見下麵的例子中使用Spring “過濾” 掃描並註冊匹配定義“regex”，即使該類組件的名稱未標注 @Component 。
DAO 層
package com.zaixian.customer.dao;
public class CustomerDAO
{
@Override
public String toString() {
return "Hello , This is CustomerDAO";
}
}
Service 層
package com.zaixian.customer.services;
import org.springframework.beans.factory.annotation.Autowired;
import com.zaixian.customer.dao.CustomerDAO;
public class CustomerService
{
@Autowired
CustomerDAO customerDAO;
@Override
public String toString() {
return "CustomerService [customerDAO=" + customerDAO + "]";
}
}
Spring 過濾
<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-2.5.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-2.5.xsd">
<context:component-scan base-package="com.zaixian" >
<context:include-filter type="regex"
expression="com.zaixian.customer.dao.*DAO.*" />
<context:include-filter type="regex"
expression="com.zaixian.customer.services.*Service.*" />
</context:component-scan>
</beans>
執行
package com.xuhuhu.common;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.zaixian.customer.services.CustomerService;
public class App
{
public static void main( String[] args )
{
ApplicationContext context =
new ClassPathXmlApplicationContext(new String[] {"Spring-AutoScan.xml"});
CustomerService cust = (CustomerService)context.getBean("customerService");
System.out.println(cust);
}
}
輸出
CustomerService [customerDAO=Hello , This is CustomerDAO]
在這個XML過濾中，所有檔的名稱中包含 DAO 或 Service(*DAO.*, *Services.*) 單詞將被檢測並在 Spring 容器中註冊。
2.過濾組件 - 不包含
另外，您還可以排除指定組件，以避免 Spring 檢測和 Spring 容器註冊。不包括在這些檔中標注有 @Service 。
<context:component-scan base-package="com.zaixian.customer" > <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Service" /> </context:component-scan>
不包括那些包含DAO這個片語檔案名。
<context:component-scan base-package="com.zaixian" > <context:exclude-filter type="regex" expression="com.zaixian.customer.dao.*DAO.*" /> </context:component-scan>
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Spring自動掃描組件
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Spring自動裝配Beans