spring boot 擴展之AutoConfigurationImportListener

? ? 最近閱讀spring boot源碼時發現，發現當spring使用ConfigurationClassParser加載使用@Configuration注解類后，會使用AutoConfigurationImportSelector對加載的

@Configuration注解的類進行一次過濾。當AutoConfigurationImportSelector過濾完成后會自動加載類路徑下Jar包中META-INF/spring.factories文件中 AutoConfigurationImportListener的實現類

并觸發fireAutoConfigurationImportEvents事件。

?

　實現AutoConfigurationImportListener接口，當fireAutoConfigurationImportEvents事件被觸發時，打印出已經注冊到spring上下文中的@Configuration注解的類,打印出被阻止注冊到spring

上下文中的@Configuration注解類

package com.torlight;

import org.springframework.boot.autoconfigure.AutoConfigurationImportEvent;
import org.springframework.boot.autoconfigure.AutoConfigurationImportListener;

public class SysoutAutoConfigurationImportListener implements
        AutoConfigurationImportListener {

    @Override
    public void onAutoConfigurationImportEvent(
            AutoConfigurationImportEvent event) {
        
        System.out.println("================output print registered configurations");
        for(String str:event.getCandidateConfigurations()){
            System.out.println(">>> the configuration => "+ str +" has registered ");
        }
        
        System.out.println("================output print exclusions configurations");
        for(String str:event.getExclusions()){
            System.out.println(">>> the configuration =>"+ str +" has exclusion ");
        }

    }

}

在src/main/resources/META-INF/spring.factories 文件中增加

org.springframework.boot.autoconfigure.AutoConfigurationImportListener=com.torlight.SysoutAutoConfigurationImportListener

?

?

控制臺輸出：

================output print registered configurations
>>> the configuration => org.springframework.boot.autoconfigure.context.MessageSourceAutoConfiguration has registered
>>> the configuration => org.springframework.boot.autoconfigure.context.PropertyPlaceholderAutoConfiguration has registered
>>> the configuration => org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration has registered
>>> the configuration => org.springframework.boot.autoconfigure.websocket.WebSocketAutoConfiguration has registered
>>> the configuration => org.springframework.boot.autoconfigure.web.EmbeddedServletContainerAutoConfiguration has registered
>>> the configuration => org.springframework.boot.autoconfigure.web.DispatcherServletAutoConfiguration has registered
>>> the configuration => org.springframework.boot.autoconfigure.validation.ValidationAutoConfiguration has registered
>>> the configuration => org.springframework.boot.autoconfigure.web.ErrorMvcAutoConfiguration has registered
>>> the configuration => org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration has registered
>>> the configuration => org.springframework.boot.autoconfigure.jdbc.JndiDataSourceAutoConfiguration has registered
>>> the configuration => org.mybatis.spring.boot.autoconfigure.MybatisAutoConfiguration has registered
>>> the configuration => org.springframework.boot.actuate.autoconfigure.AuditAutoConfiguration has registered
>>> the configuration => org.springframework.boot.autoconfigure.cache.CacheAutoConfiguration has registered
>>> the configuration => org.springframework.boot.actuate.autoconfigure.CacheStatisticsAutoConfiguration has registered
>>> the configuration => org.springframework.boot.actuate.autoconfigure.MetricRepositoryAutoConfiguration has registered
>>> the configuration => org.springframework.boot.autoconfigure.jmx.JmxAutoConfiguration has registered
>>> the configuration => org.springframework.boot.actuate.autoconfigure.PublicMetricsAutoConfiguration has registered
>>> the configuration => org.springframework.boot.autoconfigure.info.ProjectInfoAutoConfiguration has registered
>>> the configuration => org.springframework.boot.actuate.autoconfigure.InfoContributorAutoConfiguration has registered
>>> the configuration => org.springframework.boot.actuate.autoconfigure.HealthIndicatorAutoConfiguration has registered
>>> the configuration => org.springframework.boot.actuate.autoconfigure.EndpointAutoConfiguration has registered
>>> the configuration => org.springframework.boot.actuate.autoconfigure.EndpointMBeanExportAutoConfiguration has registered
>>> the configuration => org.springframework.boot.autoconfigure.web.ServerPropertiesAutoConfiguration has registered
>>> the configuration => org.springframework.boot.actuate.autoconfigure.ManagementServerPropertiesAutoConfiguration has registered
>>> the configuration => org.springframework.boot.autoconfigure.web.HttpMessageConvertersAutoConfiguration has registered
>>> the configuration => org.springframework.boot.autoconfigure.hateoas.HypermediaAutoConfiguration has registered
>>> the configuration => org.springframework.boot.actuate.autoconfigure.EndpointWebMvcAutoConfiguration has registered
>>> the configuration => org.springframework.boot.actuate.autoconfigure.MetricExportAutoConfiguration has registered
>>> the configuration => org.springframework.boot.actuate.autoconfigure.MetricFilterAutoConfiguration has registered
>>> the configuration => org.springframework.boot.actuate.autoconfigure.TraceRepositoryAutoConfiguration has registered
>>> the configuration => org.springframework.boot.actuate.autoconfigure.TraceWebFilterAutoConfiguration has registered
>>> the configuration => org.springframework.boot.actuate.cloudfoundry.CloudFoundryActuatorAutoConfiguration has registered
>>> the configuration => org.springframework.boot.autoconfigure.admin.SpringApplicationAdminJmxAutoConfiguration has registered
>>> the configuration => org.springframework.boot.autoconfigure.aop.AopAutoConfiguration has registered
>>> the configuration => org.springframework.boot.autoconfigure.context.ConfigurationPropertiesAutoConfiguration has registered
>>> the configuration => org.springframework.boot.autoconfigure.dao.PersistenceExceptionTranslationAutoConfiguration has registered
>>> the configuration => org.springframework.boot.autoconfigure.jdbc.DataSourceTransactionManagerAutoConfiguration has registered
>>> the configuration => org.springframework.boot.autoconfigure.jdbc.JdbcTemplateAutoConfiguration has registered
>>> the configuration => org.springframework.boot.autoconfigure.mail.MailSenderValidatorAutoConfiguration has registered
>>> the configuration => org.springframework.boot.autoconfigure.transaction.TransactionAutoConfiguration has registered
>>> the configuration => org.springframework.boot.autoconfigure.web.HttpEncodingAutoConfiguration has registered
>>> the configuration => org.springframework.boot.autoconfigure.web.MultipartAutoConfiguration has registered
>>> the configuration => org.springframework.boot.autoconfigure.web.WebClientAutoConfiguration has registered
>>> the configuration => org.springframework.boot.devtools.autoconfigure.DevToolsDataSourceAutoConfiguration has registered
>>> the configuration => org.springframework.boot.devtools.autoconfigure.LocalDevToolsAutoConfiguration has registered
>>> the configuration => org.springframework.boot.devtools.autoconfigure.RemoteDevToolsAutoConfiguration has registered
================output print exclusions configurations
>>> the configuration =>org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration has exclusion