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log4j2.xml 使用 application.yml 配置的属性

news 来源：原创 2024/9/20 17:49:02

参考：https://www.jianshu.com/p/1f2427c87139

log4j2.xml 是不归 spring 管理的，所以也就没法读取到 application.yml 里面的配置了。解决方式：通过 spring 的监听器(Listener)功能，将我们读取到的 application.yml 的日志路径设置到系统属性，然后在日志文件里面读取对应的系统属性就行了。

LoggingListener.java

通过 spring 的监听器(Listener)功能，将我们读取到的 application.yml 的日志路径设置到系统属性,或者使用MDC

import org.apache.commons.lang3.StringUtils;
import org.springframework.boot.context.event.ApplicationEnvironmentPreparedEvent;
import org.springframework.boot.context.logging.LoggingApplicationListener;
import org.springframework.context.ApplicationEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.core.Ordered;
import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.stereotype.Component;/*** 读取yml配置传递到log4jXml中** @author Clay*/
@Component
public class LoggingListener implements ApplicationListener<ApplicationEvent>, Ordered {/*** 提供给日志文件读取配置的key，使用时需要在前面加上 sys:*/private final static String LOG_PATH = "log.path";/*** spring 内部设置的日志文件的配置key*/private final static String SPRING_LOG_PATH_PROP = "spring.log-file-path";@Overridepublic void onApplicationEvent(ApplicationEvent applicationEvent) {if (applicationEvent instanceof ApplicationEnvironmentPreparedEvent) {ConfigurableEnvironment environment = ((ApplicationEnvironmentPreparedEvent) applicationEvent).getEnvironment();String filePath = environment.getProperty(SPRING_LOG_PATH_PROP);if (StringUtils.isNotEmpty(filePath)) {System.err.println("=================" + filePath);System.setProperty(LOG_PATH, filePath);}}}@Overridepublic int getOrder() {// 当前监听器的启动顺序需要在日志配置监听器的前面，所以此处减 1return LoggingApplicationListener.DEFAULT_ORDER - 1;}}

application.yml

spring: log-file-path: "F:/logs/"

log4j2.xml

<Property name="log-path">${sys:log.path}</Property>

Application.java

这里没有贴出注解，关键于.addListeners(new LoggingListener())

内置Tomcat

public class Application {public static void main(String[] args) {SpringApplication application = new SpringApplication(Application.class);// 添加 日志监听器，使 log4j2-spring.xml 可以间接读取到配置文件的属性application.addListeners(new LoggingListener());application.run(args);}}

外置Tomcat

public class TomcatApplication extends SpringBootServletInitializer {@Overrideprotected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {// 添加 日志监听器，使 log4j2-spring.xml 可以间接读取到配置文件的属性builder.application().addListeners(new LoggingListener());return builder.sources(Application.class);}}