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- 引用slf4j和logback的依赖,尤其是logback-ext-spring,是Logback对于Spring的扩展:
<!-- Logging begin -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${slf4j.version}</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>${logback.version}</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-core</artifactId>
<version>${logback.version}</version>
</dependency>
<dependency>
<groupId>org.logback-extensions</groupId>
<artifactId>logback-ext-spring</artifactId>
<version>${logback-ext-spring.version}</version>
</dependency>
<!-- Logging end -->
- 定义Listener,作用是在项目启动时初始化Logback组件:
import ch.qos.logback.ext.spring.web.WebLogbackConfigurer;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
public class LogbackListener implements ServletContextListener {
@Override
public void contextInitialized(ServletContextEvent sce) {
// 注入系统变量,可以在logback.xml中引用
System.setProperty("customSystemProperty", "xxx");
WebLogbackConfigurer.initLogging(sce.getServletContext());
}
@Override
public void contextDestroyed(ServletContextEvent sce) {
WebLogbackConfigurer.shutdownLogging(sce.getServletContext());
}
}
- 在web.xml中声明LogbackListener,可指定logback.xml文件的路径:
<context-param>
<param-name>logbackConfigLocation</param-name>
<param-value>classpath:logback.xml</param-value>
</context-param>
<listener>
<listener-class>com.yjy.listener.LogbackListener</listener-class>
</listener>
- 自定义logback.xml,声明日志格式、存放路径等:
<?xml version="1.0" encoding="UTF-8" ?>
<configuration>
<property name="LOG_HOME" value="/export/logs/spring-framework-demo/" />
<property name="APP_NAME" value="spring-framework-demo" />
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<!-- 此处引用了LogbackListener中注入的系统变量 -->
<pattern>${APP_NAME}-${customSystemProperty}: %d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %p - %c %method %m%n</pattern>
</encoder>
</appender>
<appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<FileNamePattern>${LOG_HOME}${APP_NAME}.%d{yyyy-MM-dd}.log.gz</FileNamePattern>
<!-- 日志文件保留天数 -->
<MaxHistory>30</MaxHistory>
</rollingPolicy>
<encoder>
<pattern>${APP_NAME}: %d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %p - %c %method %m%n</pattern>
</encoder>
</appender>
<root>
<level value="INFO" />
<appender-ref ref="STDOUT" />
<appender-ref ref="FILE" />
</root>
</configuration>