Spring boot中使用log4j记录日志

一点睛

Spring Boot中默认日志工具是logback。对于很多习惯使用log4j的开发者，Spring Boot依然可以很好的支持，只是需要做一些小小的配置。

二引入log4j依赖

在创建Spring Boot工程时，我们引入了spring-boot-starter，其中包含了spring-boot-starter-logging，该依赖内容就是Spring Boot默认的日志框架Logback，所以我们在引入log4j之前，需要先排除该包的依赖，再引入log4j的依赖。

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter</artifactId>
        <exclusions>
            <exclusion>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-logging</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-log4j</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>

三配置log4j.properties

# LOG4J配置
log4j.rootCategory=INFO, stdout, file, errorfile
log4j.category.com.didispace=DEBUG, didifile
log4j.logger.error=errorfile

# 控制台输出
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss,SSS} %5p %c{1}:%L - %m%n

# root日志输出
log4j.appender.file=org.apache.log4j.DailyRollingFileAppender
log4j.appender.file.file=logs/all.log
log4j.appender.file.DatePattern='.'yyyy-MM-dd
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss,SSS} %5p %c{1}:%L - %m%n

# error日志输出
log4j.appender.errorfile=org.apache.log4j.DailyRollingFileAppender
log4j.appender.errorfile.file=logs/error.log
log4j.appender.errorfile.DatePattern='.'yyyy-MM-dd
log4j.appender.errorfile.Threshold = ERROR
log4j.appender.errorfile.layout=org.apache.log4j.PatternLayout
log4j.appender.errorfile.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss,SSS} %5p %c{1}:%L - %m%n

# com.didispace下的日志输出
log4j.appender.didifile=org.apache.log4j.DailyRollingFileAppender
log4j.appender.didifile.file=logs/my.log
log4j.appender.didifile.DatePattern='.'yyyy-MM-dd
log4j.appender.didifile.layout=org.apache.log4j.PatternLayout
log4j.appender.didifile.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss,SSS} %5p %c{1}:%L ---- %m%n

四启动类

package com.didispace;

import org.apache.log4j.Logger;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.annotation.EnableScheduling;

@SpringBootApplication
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }

}

五测试类

package com.didispace;

import org.apache.log4j.Logger;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.SpringApplicationConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;


@RunWith(SpringJUnit4ClassRunner.class)
@SpringApplicationConfiguration(classes = Application.class)
public class ApplicationTests {

    private Logger logger = Logger.getLogger(getClass());

    @Test
    public void test() throws Exception {
        logger.info("输出info");
        logger.debug("输出debug");
        logger.error("输出error");
    }

}

六测试结果

1 控制台输出

2018-11-03 11:46:46,343 INFO ApplicationTests:18 - 输出info

2018-11-03 11:46:46,344 DEBUG ApplicationTests:19 - 输出debug

2018-11-03 11:46:46,344 ERROR ApplicationTests:20 - 输出error

2 文件输出

Spring boot中使用log4j记录日志

七参考

http://blog.didispace.com/springbootlog4j/

Spring boot中使用log4j记录日志

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