log4j+slf4j在Java項目中的使用

一，maven依賴

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <slf4j.version>1.7.16</slf4j.version>
    <log4j.version>1.2.17</log4j.version>
  </properties>    
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-api</artifactId>
      <version>${slf4j.version}</version>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-log4j12</artifactId>
      <version>${slf4j.version}</version>
      <scope>${hadoop.deps.scope}</scope>
    </dependency>
    <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
      <version>${log4j.version}</version>
    </dependency>

二、配置文件簡單樣例（將log4j.properties 放置於src\main\resources目錄下）

### set log levels ###
log4j.rootLogger =INFO,stdout,R

log4j.appender.stdout = org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target = System.out
log4j.appender.stdout.Threshold = INFO
log4j.appender.stdout.layout =org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern =%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n

log4j.appender.R=org.apache.log4j.RollingFileAppender
log4j.appender.R.MaxFileSize=100MB 
log4j.appender.R.File=log/runlog.log
log4j.appender.R.Threshold = INFO
log4j.appender.R.layout=org.apache.log4j.PatternLayout
log4j.appender.R.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss,SSS} %-5p %c{1}:%L - %m%n 

三、代碼示例

 private static final Logger log = LoggerFactory.getLogger(MainApp.class);