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  • idea+maven配置log4j详解

    经过上一篇的讲解,知道了实现log4j打印日志依赖的jar包共3个,在pom.xml中加入相关依赖:

           <!-- 添加log4j日志相关jar包:共3个jar-->
            <!-- https://mvnrepository.com/artifact/log4j/log4j -->
            <dependency>
                <groupId>log4j</groupId>
                <artifactId>log4j</artifactId>
                <version>1.2.17</version>
            </dependency>
            <!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-api -->
            <dependency>
                <groupId>org.slf4j</groupId>
                <artifactId>slf4j-api</artifactId>
                <version>1.7.25</version>
            </dependency>
            <!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-log4j12 -->
            <dependency>
                <groupId>org.slf4j</groupId>
                <artifactId>slf4j-log4j12</artifactId>
                <version>1.7.25</version>
                <scope>test</scope>
            </dependency>

    第二步,在项目的 src/test/resource目录下新建log4j.properties文件,文件内容为: 

    ### set log levels ###
    log4j.rootLogger = debug,stdout,R 
    
    ### console appender###
    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 [%t] %p [%c] - %m%n
    
    ### output to files ###
    log4j.appender.R = org.apache.log4j.DailyRollingFileAppender
    log4j.appender.R.File = logs/log.txt
    log4j.appender.R.Append = true
    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}-[%p]%m%n
    log4j.appender.R.layout.ConversionPattern = %d [%t] %p [%c] - %m%n

    第三步,编写测试代码

    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    
    public class Log4jTest {
        public static void main(String[] args) {
            Logger LOG = LoggerFactory.getLogger(Log4jTest.class);
            LOG.info("开始记录日志...");
            LOG.info("循环打印0到10之间的整数");
            for(int i=0;i<10;i++) {
                System.out.println(i);
            }
            LOG.info("结束日志!");
        }
    }

    执行结果:

    2018-11-30 12:54:53,071 [main] INFO [Log4jTest] - 开始记录日志...
    2018-11-30 12:54:53,071 [main] INFO [Log4jTest] - 循环打印0到10之间的整数
    0
    1
    2
    3
    4
    5
    6
    7
    8
    9
    2018-11-30 12:54:53,071 [main] INFO [Log4jTest] - 结束日志!
    
    Process finished with exit code 0

    第四步,在项目的相应目录下面查看生成的log文件,测试代码log日志所在路径为 /logs/log.txt

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  • 原文地址:https://www.cnblogs.com/janson071/p/10043538.html
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