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【已解决】spring boot中已配置log4j2有console的log输出但是没有生成日志文件

日志 crifan 406浏览 0评论
折腾:
【未解决】给Spring Boot的java项目中加上输出日志到文件中
期间,去配置:
src/server/xxx/xxx/pom.xml
    <properties>
        <java.version>1.8</java.version>
        <log4j2.version>2.13.0</log4j2.version>
    </properties>

        <dependency> 
            <groupId>org.apache.logging.log4j</groupId> 
            <artifactId>log4j-api</artifactId> 
            <version>${log4j2.version}</version> 
        </dependency> 
        <dependency> 
                <groupId>org.apache.logging.log4j</groupId> 
                <artifactId>log4j-core</artifactId> 
                <version>${log4j2.version}</version> 
                </dependency> 
        <dependency> 
                <groupId>org.apache.logging.log4j</groupId> 
                <artifactId>log4j-slf4j-impl</artifactId> 
                <version>${log4j2.version}</version> 
        </dependency>


        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.30</version>
        </dependency>
且更新了配置:
以及加上了配置文件:
src/server/xxx/xxx/src/main/resources/log4j2.xml
<?xml version="1.0" encoding="UTF-8"?>
<Configuration>
  <Appenders>
    <File name="FILEOUT" fileName="xxx.log" append="false">
      <PatternLayout>
        <Pattern>%d{yyyyMMdd HH:mm:ss} %-5p [%t] %C{2} %F%L - %m%n</Pattern>
      </PatternLayout>
    </File>


    <Console name="STDOUT" target="SYSTEM_OUT">
      <PatternLayout pattern="%d %-5p %F:%L - %m%n"/>
    </Console>
  </Appenders>


  <Loggers>
    <Root level="debug">
      <AppenderRef ref="FILEOUT"/>
      <AppenderRef ref="STDOUT"/>
    </Root>
  </Loggers>
</Configuration>
但是代码
src/server/xxx/xxx/src/main/java/com/crifan/xxx/GreetingController.java
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


...
public class GreetingController {
    ...
    private static Logger logger = LoggerFactory.getLogger(GreetingController.class);
...
    @PostMapping(path = "/greeting", consumes = MediaType.APPLICATION_JSON_VALUE, produces = MediaType.APPLICATION_JSON_VALUE)
    public Greeting addMember(@RequestBody Map<String, Object> payload) {
        logger.info("post greeting: payload={}", payload);
...
    }
}
始终没能生成日志文件。
所以感觉问题转换为:
spring boot log4j2 not generate file 
Log4j2 not creating log file with Spring Boot in Linux – Stack Overflow
去试试:
            <exclusions>
                <exclusion>
                        <groupId>org.springframework.boot</groupId>
                        <artifactId>spring-boot-starter-logging</artifactId>
                </exclusion>
            </exclusions>
如图:
结果:
问题依旧。
java – Spring Boot – log4j2.properties creating log files but not writing the logs in file – Stack Overflow
额外再加上:
    <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-log4j2</artifactId>
        </dependency>
以及
src/server/xxx/xxx/src/main/resources/application.properties
logging.config=src/main/resources/log4j2.xml
结果:
可以生成log文件了:
【总结】
此处之前之所以配置好了,但是没有日志文件,主要是:
spring-boot默认用自己的log库是logback
所以此处虽然有console的log输出,但是并没有log文件生成,即log4j2的配置没生效。
想要生成日志文件,即让log4j2的配置生效,需要:
禁止掉spring-boot的log
具体配置是:
src/server/xxx/xxx/pom.xml
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</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-log4j2</artifactId>
        </dependency>
同时:
src/server/xxx/xxx/src/main/resources/application.properties
logging.config=src/main/resources/log4j2.xml
即可生成日志文件。

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