日志打印的学习之log4j2（一）最简单的案例

spring框架

首先引入依赖

 <dependency>
            <groupId>org.apache.logging.log4jgroupId>
            <artifactId>log4j-coreartifactId>
            <version>2.11.1version>
        dependency>

其次在resources下新增log4j2.xml文件

"1.0" encoding="UTF-8"?>
<configuration>
    
    <appenders>　
        
        <Console name="Console" target="SYSTEM_OUT">
            <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/>
        Console>
        
        <file name="file" fileName="log/mylog.log">
            <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/>
        file>
 
    appenders>
 
    
    <loggers>
        
        <root level="info">　　　
            <appender-ref ref="Console"/>
            <appender-ref ref="file"/>
        root>
    loggers>
configuration>
 
 

测试类test.java

package Thread;
 
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
 
public class test {
    static Logger log = LogManager.getLogger(test.class.getName());
 
    public static void main(String[] args) {
        log.info("日志打印测试");
        log.debug("日志打印测试");
    }
 
}

spring-boot框架 XML配置实现日志打印

首先还是引入依赖 ，注意一定要去掉springboot的默认日志配置

        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starterartifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.bootgroupId>
                    <artifactId>spring-boot-starter-loggingartifactId>
                exclusion>
            exclusions>
        dependency>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-webartifactId>
        dependency>
 
        <dependency> 
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-log4j2artifactId>
        dependency>

 其余的与spring的配置方式一致

spring-boot框架 yml配置实现

server:
  port: 8080
  servlet:
    context-path: /demo
#日志打印
logging:
  level:
    Root: debug
  file: log/mylog2.log