spring集成 log4j + slf4j

以maven web项目为例，

首先、在pom文件引入相关依赖，如下（spring官网文档有介绍）：

<dependencies><!-- spring 相关 --><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-core</artifactId><version>4.0.2.RELEASE</version><exclusions><exclusion><groupId>commons-logging</groupId><artifactId>commons-logging</artifactId></exclusion></exclusions></dependency><dependency><groupId>org.slf4j</groupId><artifactId>jcl-over-slf4j</artifactId><version>1.5.8</version></dependency><dependency><groupId>org.slf4j</groupId><artifactId>slf4j-api</artifactId><version>1.5.8</version></dependency><dependency><groupId>org.slf4j</groupId><artifactId>slf4j-log4j12</artifactId><version>1.5.8</version></dependency><dependency><groupId>log4j</groupId><artifactId>log4j</artifactId><version>1.2.14</version></dependency>
</dependencies>

spring 内部默认使用的日志框架是： commons-logging（需排除该依赖）， 引入“jcl-over-slf4j”依赖，使spring对common-logging的调用转为对slf4j的调用，

需要注意的是： 排除commons-logging依赖后，若不配置其他替代依赖（jcl-over-slf4j），容器初始化时会报错：java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory

 

接着编写log4j配置文件log4j.xml，位于classpath路径下（src/main/resources）

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE log4j:configuration PUBLIC "-//APACHE//DTD LOG4J 1.2//EN" "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/"><!-- Appenders --><appender name="FILE" class="org.apache.log4j.RollingFileAppender"><param name="file" value="${project.home}/logs/dispatchmanage.log" /><param name="append" value="true" /><param name="maxFileSize" value="100MB" /><param name="maxBackupIndex" value="10" /><layout class="org.apache.log4j.PatternLayout"><param name='ConversionPattern' value='[%-5p][%d{yyyy/MM/dd HH:mm:ss}][%l][%m]%n' /></layout></appender><appender name="Console" class="org.apache.log4j.ConsoleAppender"><param name="Target" value="System.out" /><layout class="org.apache.log4j.PatternLayout"><param name='ConversionPattern' value='[%-5p][%d{yyyy/MM/dd HH:mm:ss}][%l][%m]%n' /></layout></appender><!-- Application Loggers --><logger name="com.hgs"><level value="debug" /><appender-ref ref="FILE" /></logger><!-- 3rdparty Loggers --><logger name="org.springframework.core"><level value="info" /></logger><logger name="org.springframework.beans"><level value="info" /></logger><logger name="org.springframework.context"><level value="info" /></logger><logger name="org.springframework.web"><level value="info" /></logger><!-- SQL Loggers --><logger name="java.sql.Statement" additivity="true"> <level value="debug" /> </logger> <logger name="java.sql.PreparedStatement" additivity="true"> <level value="debug" /> </logger> <logger name="com.ibatis"><level value="info" /></logger><logger name="com.ibatis.common.jdbc"><level value="info" /></logger><logger name="com.ibatis.sqlmap.engine.impl"><level value="info" /></logger><logger name="java.sql.Connection"><level value="info" /></logger><!-- Root Logger --><root><level value="debug" /><appender-ref ref="Console" /></root></log4j:configuration>

 

到此所有的配置工作就完成了，紧接着就可以在实际代码中编程使用了，如下：

package com.yinz.tool.quartz.test;import java.util.Date;import org.quartz.Job;
import org.quartz.JobDataMap;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;/*** * @description:调度任务要执行的具体操作，* 该类必须要有一个无参构造器 * @author yinz* 2016-7-7*/
public class SimpleJob implements Job {private Logger logger = LoggerFactory.getLogger(SimpleJob.class);public void execute(JobExecutionContext context) throws JobExecutionException {//JobDataMap dataMap = context.getJobDetail().getJobDataMap(); //JobDetail中的JobDataMapJobDataMap dataMap = context.getMergedJobDataMap();  //trigger和JobDetail的中的JobDataMap的合并String jobMsg = dataMap.getString("jobMsg");String triggerMsg = dataMap.getString("triggerMsg");logger.info(new Date() + " :  < " + jobMsg + " >, < " + triggerMsg + " >" );}}

代码中可以看出，我们是面向slf4j 的api编程，这样就可以方便实现在不同的日志框架间切换而不需修改代码。