java web工程中logback换配置文件的路径

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web.xml中配置：

<!-- windows  logback.xml文件跟web容器（比如tomcat)在同一个目录中。linux随意  -->

<context-param>

<param-name>logbackConfigLocation</param-name>

<param-value>file:/datum/Data/conf/config/logback.xml</param-value>

</context-param>

<!-- logback.xml随意放  -->

<context-param>

<param-name>logbackConfigLocation</param-name>

<param-value>file:E:\\datum\\data\\conf\\logback.xml</param-value>

</context-param>

其中file:一定要有。

<listener>

<listener-class>com.cxfmvcstu.comn.LogbackConfigListener</listener-class>

</listener>

LogbackConfigListener为自己的实现类

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.io.UrlResource;

import ch.qos.logback.classic.LoggerContext;
import ch.qos.logback.classic.joran.JoranConfigurator;
import ch.qos.logback.core.joran.spi.JoranException;

/**
 * @description
 * @path com.cxfmvcstu.comn.LogbackConfigListener
 * @author lijun.justin
 * @time 2015年6月27日 下午8:13:19
 */
public class LogbackConfigListener implements ServletContextListener {
	private static final Logger logger = LoggerFactory.getLogger(LogbackConfigListener.class);

	private static final String CONFIG_LOCATION = "logbackConfigLocation";

	@Override
	public void contextInitialized(ServletContextEvent event) {
		// 从web.xml中加载指定文件名的日志配置文件
		String logbackConfigLocation = event.getServletContext().getInitParameter(CONFIG_LOCATION);
		String fn = event.getServletContext().getRealPath(logbackConfigLocation);
		try {
			UrlResource urlResource = new UrlResource(logbackConfigLocation);
			LoggerContext loggerContext = (LoggerContext) LoggerFactory.getILoggerFactory();
			loggerContext.reset();
			JoranConfigurator joranConfigurator = new JoranConfigurator();
			joranConfigurator.setContext(loggerContext);
			//joranConfigurator.doConfigure(fn);
			joranConfigurator.doConfigure(urlResource.getFile().getAbsolutePath());
			logger.debug("loaded slf4j configure file from {}", fn);
		} catch (JoranException e) {
			logger.error("can loading slf4j configure file from " + fn, e);
		}catch (Exception e) {
			logger.error(e.getMessage(), e);
		}

	}

	@Override
	public void contextDestroyed(ServletContextEvent event) {
	}
}

要依赖于spring的UrlResource类。里面无用的代码，读者自己精简一下

logback.xml的配置示例：

<?xml version="1.0" encoding="UTF-8" ?>

<configuration scan="true" scanPeriod="60 seconds" debug="false">

<!-- 控制台输出 -->

<appender name="stdout" class="ch.qos.logback.core.ConsoleAppender">

<encoder>

<pattern>%date [%thread] %-5level %logger{80} - %msg%n</pattern>

</encoder>

</appender>

<!-- 时间滚动输出 level为 INFO 日志 -->

<appender name="file—INFO"

class="ch.qos.logback.core.rolling.RollingFileAppender">

<filter class="ch.qos.logback.classic.filter.LevelFilter">

<level>INFO</level>

<onMatch>ACCEPT</onMatch>

<onMismatch>DENY </onMismatch>

</filter>

<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">

<FileNamePattern>D:/logs/INFO.%d{yyyy-MM-dd}.log</FileNamePattern>

<MaxHistory>30</MaxHistory>

</rollingPolicy>

<encoder>

<pattern>%date [%thread] %-5level %logger{80} - %msg%n</pattern>

</encoder>

</appender>

<!-- 时间滚动输出 level为 ERROR 日志 -->

<appender name="file—error" class="ch.qos.logback.core.rolling.RollingFileAppender">

<filter class="ch.qos.logback.classic.filter.LevelFilter">

<level>ERROR</level>

<onMatch>ACCEPT</onMatch>

<onMismatch>DENY </onMismatch>

</filter>

<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">

<FileNamePattern>D:/logs/error.%d{yyyy-MM-dd}.log</FileNamePattern>

<MaxHistory>30</MaxHistory>

</rollingPolicy>

<encoder>

<pattern>%date [%thread] %-5level %logger{80} - %msg%n</pattern>

</encoder>

</appender>

<!-- 特定过滤含有某字符串的日志   需要额外的两个JAR包，commons-compiler.jar和janino.jar

<appender name="file-str" class="ch.qos.logback.core.rolling.RollingFileAppender">

<filter class="ch.qos.logback.core.filter.EvaluatorFilter">

<level>ERROR</level>

<evaluator>

<expression>message.contains("str")</expression>

</evaluator>

<onMatch>ACCEPT</onMatch>

<onMismatch>DENY</onMismatch>

</filter>

<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">

<FileNamePattern>D:/logs/contains.%d{yyyy-MM-dd}.log

</FileNamePattern>

<MaxHistory>30</MaxHistory>

</rollingPolicy>

<encoder>

<pattern>%date [%thread] %-5level %logger{80} - %msg%n</pattern>

</encoder>

</appender>  -->

<!-- 数据库输出

<appender name="db" class="ch.qos.logback.classic.db.DBAppender">

<filter class="ch.qos.logback.core.filter.EvaluatorFilter">

<level>ERROR</level>

<evaluator>

<expression>message.contains("str")</expression>

</evaluator>

<onMatch>ACCEPT</onMatch>

<onMismatch>DENY</onMismatch>

</filter>

<connectionSource

class="ch.qos.logback.core.db.DriverManagerConnectionSource">

<driverClass>com.mysql.jdbc.Driver</driverClass>

<url>jdbc:mysql://host_name:3306/datebase_name</url>

<user>username</user>

<password>password</password>

</connectionSource>

</appender> -->

<root level="INFO">

<appender-ref ref="stdout" />

<appender-ref ref="file—INFO" />

<appender-ref ref="file—error" />

<appender-ref ref="file-str" />

<appender-ref ref="db" />

</root>

</configuration>

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