启动项目无法打印日志处理及logback简单使用

我会带着你远行 2021-09-24 23:54 766阅读 0赞

## 一、启动项目无法打印日志处理 ##

1.  运行maven web项目是提示如下代码  
    WARN No appenders could be found for logger
2.  处理
    
    1.  在resources 目录下创建log4j.properties文件
    2.  代码如下

log4j.rootLogger=INFO, stdout, D
    
    # Console Appender
    log4j.appender.stdout=org.apache.log4j.ConsoleAppender
    log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
    log4j.appender.stdout.layout.ConversionPattern= %d{hh:mm:ss,SSS} [%t] %-5p %c %x - %m%n
    
    # Custom tweaks
    log4j.logger.com.codahale.metrics=WARN
    log4j.logger.com.ryantenney=WARN
    log4j.logger.com.zaxxer=WARN
    log4j.logger.org.apache=WARN
    log4j.logger.org.hibernate=WARN
    log4j.logger.org.hibernate.engine.internal=WARN
    log4j.logger.org.hibernate.validator=WARN
    log4j.logger.org.springframework=WARN
    log4j.logger.org.springframework.web=WARN
    log4j.logger.org.springframework.security=WARN
    
    # log file
    log4j.appender.D = org.apache.log4j.DailyRollingFileAppender
    log4j.appender.D.File = D://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

注：https://blog.csdn.net/qq\_37502106/article/details/86659947

## 二、logback简单使用 ##

1.  创建maven相关的web项目
2.  添加maven

<dependency>
                <groupId>ch.qos.logback</groupId>
                <artifactId>logback-core</artifactId>
                <version>1.2.3</version>
            </dependency>
    		
            <dependency>
                <groupId>org.slf4j</groupId>
                <artifactId>slf4j-api</artifactId>
                <version>1.7.25</version>
            </dependency>
            <dependency>
                <groupId>ch.qos.logback</groupId>
                <artifactId>logback-classic</artifactId>
                <version>1.2.3</version>
            </dependency>

1.  在classpath路径下添加logback.xml文件

<?xml version="1.0" encoding="UTF-8"?>
    <configuration>
        <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
            <encoder>
                <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} -%msg%n</pattern>
            </encoder>
        </appender>
    
        <root level="debug">
            <appender-ref ref="STDOUT" />
        </root>
    </configuration>

1.  打印语句

package logtest;
    
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    
    public class Test { 
    	private final static Logger logger =  LoggerFactory.getLogger(Test.class);
    	public static void main(String[] args) { 
    		logger.info("Example log from {}", Test.class.getSimpleName());
    	}
    }

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