< context:include-filter>怎么做?和< context:exclude-filter>在春季工作? [英] How do <context:include-filter> and <context:exclude-filter> work in Spring?

问题描述

我有几项服务:

• example.MailService
• example.LDAPService
• example.SQLService
• example.WebService
• example.ExcelService

• example.MailService
• example.LDAPService
• example.SQLService
• example.WebService
• example.ExcelService

注释.如何排除除一项以外的所有服务?

annotated with @Service annotation. How can I exclude all services except one?

例如，我只想使用 MailService .我使用以下配置:

For example I want to use only MailService. I use the following configuration:

<context:component-scan base-package="example">
    <context:include-filter type="aspectj" expression="example..MailService*" />
    <context:exclude-filter type="aspectj" expression="example..*Service*" />
</context:component-scan>

但现在所有服务都被排除在外.

but now all services are excluded.

如果存在一个包含 MailService 的规则，为什么所有服务都被排除在外?

Why all services are excluded if exists one rule to include MailService?

推荐答案

在包含过滤器之后应用包含过滤器，因此您必须将两个表达式组合为一个排除过滤器. AspectJ表达式允许它(由于XML语法，&被&替换):

Include filters are applied after exclude filters, so you have to combine both expressions into one exclude filter. AspectJ expressions allow it (& is replaced by & due to XML syntax):

<context:exclude-filter type="aspectj" 
    expression="example..*Service* &amp;&amp; !example..MailService*" />

这是一个正则表达式，因此您的表达式.* Service"表示任意数量的任何字符，后跟"Service"".这明确排除了要包含的MailService.

This is a regex, so your expression ".*Service" means 'any number of any character followed by "Service"'. This explicitly excludes the MailService you want to include.

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