升级日志logging框架到logback

升级过程中遇到些许波折，如无法输出 ibatis jdbc 日志了，记下随笔供参阅。

首先要知道项目中原有日志情况，本项目中使用了spring 4, ibatis 2.3.x，

spring 使用了JCL， ibatis动态加载JCL、Log4j、jdk14log

先删除原log4j 和 JCL dependency，然而ibatis不支持sl4j，而是首先查找JCL，所以考虑使用 jcl-over-slf4j 桥接到 slf4j 。

maven依赖

    <!-- 加入logback 、 slf4j依赖包 -->    <dependency>      <groupId>ch.qos.logback</groupId>      <artifactId>logback-classic</artifactId>      <version>${logback.version}</version>    </dependency>    <dependency>      <groupId>ch.qos.logback</groupId>      <artifactId>logback-access</artifactId>      <version>${logback.version}</version>    </dependency>    <dependency>      <groupId>org.slf4j</groupId>      <artifactId>jcl-over-slf4j</artifactId>      <version>1.7.6</version>    </dependency>

加了jcl-over-slf4j 却未能生效，是因为有开源包依赖了jcl，用mvn命令找出这些包，然后exclusion掉
mvn dependency:tree

[INFO] |  |  \- dom4j:dom4j:jar:1.6.1:compile[INFO] |  |     \- xml-apis:xml-apis:jar:1.0.b2:compile[INFO] |  +- com.whalin:Memcached-Java-Client:jar:3.0.0:compile[INFO] |  \- com.baidu:bccs-api-lib:jar:1.1.2:compile[INFO] +- org.springframework:spring-test:jar:4.0.0.RELEASE:test[INFO] |  \- org.springframework:spring-core:jar:4.0.0.RELEASE:compile[INFO] |     \- commons-logging:commons-logging:jar:1.1.1:compile //找到这个jar，定位是哪个开源jar依赖的[INFO] +- junit:junit:jar:4.11:test[INFO] |  \- org.hamcrest:hamcrest-core:jar:1.3:test[INFO] +- commons-dbcp:commons-dbcp:jar:20030825.184428:test[INFO] +- org.apache.commons:commons-lang3:jar:3.3.2:compile[INFO] +- org.apache.ibatis:ibatis-sqlmap:jar:2.3.4.726:compile[INFO] \- org.springframework:spring-orm:jar:3.2.6.RELEASE:compile[INFO]    +- aopalliance:aopalliance:jar:1.0:compile

exclusion掉JCL，然后重复以上命令，直到再无 commons-logging 出现

    <dependency>      <groupId>org.springframework</groupId>      <artifactId>spring-webmvc</artifactId>      <version>4.0.0.RELEASE</version>      <exclusions>        <exclusion>          <groupId>commons-logging</groupId>          <artifactId>commons-logging</artifactId>        </exclusion>      </exclusions>    </dependency>

使用SLF4J Migrator升级历史代码
运行slf4j-migrator-XXX.jar文件，可将历史代码中的Jakarta Commons Logging (JCL) API、 log4j、java.util.logging(JUL )替换成 slf4j代码。实际上就是加入import和修改日志成员变量声明并把原日志代码删除。

java -jarslf4j-migrator-1.7.10.jar 

日志文件有两种，一种是存放所有级别（依项目中配置）日志；一种只存异常日志；

日志文件命名方式：每天一个日志文件logistic-admin-err-2014-09-09.1.log，  
在同一天内如果超出50M，序号加1如：
logistic-admin-err-2014-09-09.2.log 
logistic-admin-err-2014-09-09.3.log ...

logback xml:

<?xml version="1.0" encoding="UTF-8" ?><configuration scan="true" scanPeriod="3 seconds">  <property name="LOG_DIR" value="../logs" />  <property name="LOG_LEVEL_JDBC" value="DEBUG" />  <statusListener class="ch.qos.logback.core.status.OnConsoleStatusListener"/>  <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">    <layout class="ch.qos.logback.classic.PatternLayout">      <pattern>        %d{HH:mm:ss.SSS} [%thread] %-5level %logger{45} - %msg%n      </pattern>    </layout>  </appender>  <!--日志文件：每天一个日志文件logistic-admin-err-%d{yyyy-MM-dd}.1.log，  如果超出50M，序号加1如：logistic-admin-err-%d{yyyy-MM-dd}.2.log logistic-admin-err-%d{yyyy-MM-dd}.3.log ...-->  <appender name="FILEALL" class="ch.qos.logback.core.rolling.RollingFileAppender">    <file>${LOG_DIR}/logistic-admin.log</file>    <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">      <fileNamePattern>${LOG_DIR}/logistic-admin-%d{yyyy-MM-dd}.%i.log</fileNamePattern>      <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">        <maxFileSize>30MB</maxFileSize>      </timeBasedFileNamingAndTriggeringPolicy>    </rollingPolicy>    <append>true</append>    <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">      <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{45} - %msg%n</pattern>      <charset>utf-8</charset>    </encoder>    <!-- deny all events with a level below INFO, that is TRACE and DEBUG -->    <filter class="ch.qos.logback.classic.filter.ThresholdFilter">      <level>DEBUG</level>    </filter>  </appender>  <!--错误日志文件-->  <appender name="FILEERROR" class="ch.qos.logback.core.rolling.RollingFileAppender">    <file>${LOG_DIR}/logistic-admin-err.log</file>    <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">      <fileNamePattern>${LOG_DIR}/logistic-admin-err-%d{yyyy-MM-dd}.%i.log</fileNamePattern>      <timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">        <maxFileSize>30MB</maxFileSize>      </timeBasedFileNamingAndTriggeringPolicy>    </rollingPolicy>    <append>true</append>    <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">      <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{45} - %msg%n</pattern>      <charset>utf-8</charset>    </encoder>    <filter class="ch.qos.logback.classic.filter.LevelFilter">      <level>ERROR</level>      <onMatch>ACCEPT</onMatch>      <onMismatch>DENY</onMismatch>    </filter>  </appender>  <!--本项目日志级别-->  <logger name="com.incito.logistics" level="debug"/>  <!--依赖框架logging-->  <logger name="org.springframework" level="info"/>  <!--jdbc logging-->  <logger name="com.ibatis.common.jdbc.SimpleDataSource" level="${LOG_LEVEL_JDBC}"/>  <logger name="com.ibatis.common.jdbc.ScriptRunner" level="${LOG_LEVEL_JDBC}"/>  <logger name="com.ibatis.sqlmap.engine.impl.SqlMapClientDelegate" level="${LOG_LEVEL_JDBC}"/>  <logger name="java.sql.Connection" level="${LOG_LEVEL_JDBC}"/>  <logger name="java.sql.Statement" level="${LOG_LEVEL_JDBC}"/>  <logger name="java.sql.ResultSet" level="${LOG_LEVEL_JDBC}"/>  <logger name="java.sql.PreparedStatement" level="${LOG_LEVEL_JDBC}"/>  <root>    <level level="info" value="on"/>    <appender-ref ref="STDOUT"/>    <appender-ref ref="FILEALL"/>    <appender-ref ref="FILEERROR"/>  </root></configuration>