idea log4j 用法

一、導入jar包

這裏用的maven導入

 

     <!-- LOGGING begin -->
        <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>runtime</scope>
        </dependency>
        <!-- common-logging 實際調用slf4j -->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>jcl-over-slf4j</artifactId>
            <version>${slf4j.version}</version>
            <scope>runtime</scope>
        </dependency>
        <!-- java.util.logging 實際調用slf4j -->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>jul-to-slf4j</artifactId>
            <version>${slf4j.version}</version>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>${log4j.version}</version>
        </dependency>
        <dependency>
            <groupId>org.lazyluke</groupId>
            <artifactId>log4jdbc-remix</artifactId>
            <version>0.2.7</version>
            <scope>runtime</scope>
        </dependency>
        <!-- LOGGING end -->

　　

二、添加log4j.properties

填入配置

### 設置###
log4j.rootLogger = debug,stdout,D,E,I

### 輸出信息到控制擡 ###
log4j.appender.stdout = org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target = System.out
log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern = [%-5p] %d{yyyy-MM-dd HH:mm:ss,SSS} method:%l%n%m%n

### 輸出INFO 級別以上的日誌文件設置 ###
log4j.appender.I = org.apache.log4j.DailyRollingFileAppender
log4j.appender.I.File = log_info.log
log4j.appender.I.Append = true
log4j.appender.I.Threshold = INFO
log4j.appender.I.layout = org.apache.log4j.PatternLayout
log4j.appender.I.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n

### 輸出DEBUG 級別以上的日誌文件設置 ###
log4j.appender.D = org.apache.log4j.DailyRollingFileAppender
log4j.appender.D.File = log_debug.log
log4j.appender.D.Append = true
log4j.appender.D.Threshold = DEBUG
log4j.appender.D.layout = org.apache.log4j.PatternLayout
log4j.appender.D.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n

### 輸出ERROR 級別以上的日誌文件設置 ###
log4j.appender.E = org.apache.log4j.DailyRollingFileAppender
log4j.appender.E.File = log_error.log
log4j.appender.E.Append = true
log4j.appender.E.Threshold = ERROR
log4j.appender.E.layout = org.apache.log4j.PatternLayout
log4j.appender.E.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n

　　

三、測試代碼

 

 public static void main(String[] args){
        // 記錄debug級別的信息
        logger.debug("This is debug message.");
        // 記錄info級別的信息
        logger.info("This is info message.");
        // 記錄error級別的信息
        logger.error("This is error message.");
}

　

-----------結果會在控制檯輸出3個日誌、在項目根目錄建立3個文件 log_info、log_error、log_debug