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..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.</version>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
        <version>1.5.</version>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-log4j12</artifactId>
        <version>1.5.</version>
    </dependency>
    <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>1.2.</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="" />
        <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JobDataMap
        JobDataMap 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。