Question

我使用以下方法定义了一个简单的SpringApplicationRunListener实现：

@Override
public void finished(ConfigurableApplicationContext configurableApplicationContext, Throwable throwable) {
    logger.info("It's finished");
}

当我在没有任何Spring云依赖的情况下运行时，我得到以下日志：

2016-04-27 10:37:37.702  INFO 5720 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)
2016-04-27 10:37:37.703  INFO 5720 --- [           main] b.a.test.LazyFilterRuntimeListener       : It's finished

但是，当我添加以下依赖项时：

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-eureka</artifactId>
</dependency>

然后将“It's finished”行记录两次，最后一次（如没有Spring cloud / Eureka），一次在开始时，甚至在Spring引导徽标出现之前：

2016-04-27 10:37:35.500  INFO 5720 --- [           main] s.c.a.AnnotationConfigApplicationContext : Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@255b53dc: startup date [Wed Apr 27 10:37:35 CEST 2016]; root of context hierarchy
2016-04-27 10:37:35.638  INFO 5720 --- [           main] f.a.AutowiredAnnotationBeanPostProcessor : JSR-330 'javax.inject.Inject' annotation found and supported for autowiring
2016-04-27 10:37:35.785  INFO 5720 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'encrypt.CONFIGURATION_PROPERTIES' of type [class org.springframework.cloud.bootstrap.encrypt.KeyProperties] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2016-04-27 10:37:35.786  INFO 5720 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'encryptionBootstrapConfiguration' of type [class org.springframework.cloud.bootstrap.encrypt.EncryptionBootstrapConfiguration$$EnhancerBySpringCGLIB$$268d5fc8] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2016-04-27 10:37:35.839  INFO 5720 --- [           main] b.c.test.LazyFilterRuntimeListener       : It's finished
2016-04-27 10:37:35.842  INFO 5720 --- [           main] be.company.test.TestApplication   : Started TestApplication in 0.499 seconds (JVM running for 0.86)

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v1.2.7.RELEASE)


...

2016-04-27 10:37:37.702  INFO 5720 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)
2016-04-27 10:37:37.703  INFO 5720 --- [           main] b.c.test.LazyFilterRuntimeListener       : It's finished
2016-04-27 10:37:37.703  INFO 5720 --- [           main] be.company.test.TestApplication   : Started TestApplication in 2.423 seconds (JVM running for 2.721)

它还提到两次“开始申请......”这一行。

这种行为有特殊原因吗？我正在尝试编写一个依赖于特定bean的SpringApplicationRunListener来创建。但是，如果我添加spring cloud，第一次到达finished()方法时，尚未创建上下文，因此它当前会抛出错误。

Answer 1

实际上存在双重调用日志的问题。默认情况下，Spring Boot设置INFO级别日志记录。

Previous version of spring boot before 1.3，正如您使用1.2.7那么它使用

如果你不能用你的MDC覆盖spring boot的CONSOLE_LOG_PATTERN 增值，然后似乎你必须忍受每条日志消息写两次！（一次使用spring boot console appender和一旦你的控制台appender与MDC添加到模式）

但是在春季开机1.3 在较新版本的Spring Boot中，您可以轻松地从Spring Boot中包含base.xml并创建以下logback.xml。

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <include resource="org/springframework/boot/logging/logback/base.xml" />

    <root level="INFO">
        <appender-ref ref="FILE" />
    </root>
</configuration>

有关详情，请点击：How to disable logback ConsoleAppender in Spring Boot

资源链接：

为什么Spring引导在使用Eureka时执行SpringApplicationRunListener两次

1 个答案: