SpringBoot将logback替换成log4j2的操作步骤
作者:健康平安的活着
一 为何要替换成log4j2
1.1 log4j2的优点
log4j2使用了两种方式记录日志:AsyncAppender和AsyncLogger。
1.AsyncAppender使用队列异步记录日志,但是一旦队列已满,appender线程需要等待。
2.AsyncLogger是采用Disruptor,通过环形队列无阻塞队列作为缓冲,多生产者多线程的竞争是通过CAS实现,无锁化实现,可以降低极端大的日志量时候的延迟尖峰,Disruptor 可是号称一个线程里每秒处理600万订单的高性能队列。
注意的是: 使用AsyncLogger才会使用disruptor提高性能。如果使用的AsyncAppender,则使用的是类似logback一样的队列的方式做异步记录。
1.2 log4j2.xml如何读取application.yml中属性值
1.2.1 操作步骤
1.在application.properties 或者application.yml文件中配置
patcher.log=/data350/fengqxLogFile/patcher
2.编写监听器
@Component public class LoggerListener implements ApplicationListener<ApplicationEvent>, Ordered { @Override public void onApplicationEvent(ApplicationEvent applicationEvent) { if (applicationEvent instanceof ApplicationEnvironmentPreparedEvent) { ConfigurableEnvironment environment = ((ApplicationEnvironmentPreparedEvent) applicationEvent).getEnvironment(); String filePath = environment.getProperty("patcher.log"); if (StringUtils.isNotEmpty(filePath)) { System.err.println("=================" + filePath); System.setProperty("patcher.log", filePath); } } } @Override public 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 1 return LoggingApplicationListener.DEFAULT_ORDER - 1; }
3.在 /src/main/resources/META-INF/spring.factories进行加载监听器
org.springframework.context.ApplicationListener=com.longze.patcher.listener.MyLoggerListener
4.log4j2.xml进行使用配置是路径
1.3 log4j&slf4j&log4j2需要的导入的包
Log4j实例:
import org.apache.log4j.Logger; private static final Logger LOGGER = Logger.getLogger(X.class);
Slf4j实例:
import org.slf4j.Logger; import org.slf4j.LoggerFactory; private static final Logger logger = LoggerFactory.getLogger(X.class);
Log4j2的使用:
import org.apache.logging.log4j.LogManager; import org.apache.logging.log4j.Logger; private static final Logger logger = LogManager.getLogger(X.class);
1.4 整合log4j2需要引入的依赖与排除依赖
1.引入依赖
<dependencies> <!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-slf4j-impl --> <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-slf4j-impl</artifactId> <version>2.17.1</version> <scope>test</scope> </dependency> <!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-api --> <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-api</artifactId> <version>2.17.1</version> </dependency> <!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-core --> <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-core</artifactId> <version>2.17.1</version> </dependency> <dependency> <groupId>com.Imax</groupId> <artifactId>disruptor</artifactId> <version>2.17.1</version> </dependency> </dependencies>
排除jar包:
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