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  • 纯Java配置使用slf4j配置log4j

    工程目录如下

    代码里面用的是slf4j,但是想要用log4j来管理日志,就得添加slf4j本来的jar,然后添加log4j和slf4j箱关联的jar即可。

    如果是maven项目的话添加下面的依赖即可

    <!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-api -->
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
        <version>1.7.2</version>
    </dependency>
    
    <!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-log4j12 -->
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-log4j12</artifactId>
        <version>1.7.2</version>
    </dependency>

    注意,因为没有写log4j的加载路径,所以一定要写在src的下一级,中间不能有其他的文件夹或包,不然就不起作用了,单独用log4j的时候也要直接放在src,不能随意乱放。

    log4j.properties

    ### 设置###
    log4j.rootLogger = debug,stdout,D,E
    
    ### 输出信息到控制抬 ###
    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
    
    ### 输出DEBUG 级别以上的日志到=E://logs/error.log ###
    log4j.appender.D = org.apache.log4j.DailyRollingFileAppender
    log4j.appender.D.File = D://logs/log.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
    
    ### 输出ERROR 级别以上的日志到=E://logs/error.log ###
    log4j.appender.E = org.apache.log4j.DailyRollingFileAppender
    log4j.appender.E.File =D://logs/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

    java测试类

    package test;
    
    
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    
    public class Log4jTestDemo {
        private static Logger logger = LoggerFactory.getLogger(Log4jTestDemo.class);
    
        /**
         * @param args
         */
        public static void main(String[] args) {
            // System.out.println("This is println message.");
    
            // 记录debug级别的信息
            logger.debug("This is debug message.");
            // 记录info级别的信息
            logger.info("This is info message.");
            // 记录error级别的信息
            logger.error("This is error message.");
        }
    
    
    }

    为什么不直接用log4j,可以百度一下,使用slf4j的好处

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  • 原文地址:https://www.cnblogs.com/zml-java/p/6148849.html
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