slf4j + log4j使用

最新推荐文章于 2025-05-28 18:36:11 发布

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本文介绍如何在Maven项目中使用SLF4J进行日志记录，并通过log4j作为具体实现。文中详细展示了pom.xml配置、log4j属性文件设置及测试类的编写过程。

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使用slf4j的好处就是方便替换日志框架。

1、创建maven项目。pom配置如下

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.sugar</groupId>
  <artifactId>slf4j_Test</artifactId>
  <version>1.0</version>
  <name>slf4j_Test</name>
  
  <properties>
  	<jdk.version>1.7</jdk.version>
  	<maven-compiler-plugin.version>2.5.1</maven-compiler-plugin.version>
  	<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>
  
  <dependencies>
	<dependency>
	    <groupId>org.slf4j</groupId>
	    <artifactId>slf4j-api</artifactId>
	    <version>1.7.25</version>
	</dependency>
	<dependency>
	    <groupId>org.slf4j</groupId>
	    <artifactId>slf4j-log4j12</artifactId>
	    <version>1.7.25</version>
	</dependency>
  </dependencies>
  
  <build>
  	<plugins>
  		<plugin>
			<groupId>org.apache.maven.plugins</groupId>
			<artifactId>maven-compiler-plugin</artifactId>
			<version>${maven-compiler-plugin.version}</version>
			<configuration>
				<source>${jdk.version}</source>
				<target>${jdk.version}</target>
				<showWarnings>true</showWarnings>
			</configuration>
		</plugin>
  	</plugins>
  </build>
</project>

2、log4j配置文件：log4j.properties,简单一点只配置了控制台日志

log4j.rootLogger = DEBUG,stdout

#控制台打印
log4j.appender.stdout = org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target = System.out
log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
log4j.appender.stdout.Threshold = DEBUG
log4j.appender.stdout.layout.ConversionPattern = [%-5p] %d{yyyy-MM-dd HH:mm:ss,SSS} method:%l%n%m%n
log4j.appender.D = org.apache.log4j.DailyRollingFileAppender
log4j.appender.D.File = D://logs/log.log
log4j.appender.D.Append = true
log4j.appender.D.Threshold = INFO 
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

3、测试类

package com.sugar;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class TestSlf4j {
	private static Logger log = LoggerFactory.getLogger(TestSlf4j.class);
	
	public static void main(String[] args) {
		log.info("test slf4j");
		Exception e = new NullPointerException("nullPoint...");
		log.info("测试占位符,错误信息：{},{},{},{}",e.getMessage(),"2","3","4");
	}
}

slf4j提供了占位符功能。代码如上。