# 57.1 扩展配置

在`META-INF/spring.factories`文件中，你可以激活创建PID文件的`listener(s)`，示例：

```java
org.springframework.context.ApplicationListener=\
org.springframework.boot.system.ApplicationPidFileWriter,\
org.springframework.boot.system.EmbeddedServerPortFileWriter
```


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