配置文件的
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官方原文：
Spring Boot supports Log4j 2 for logging configuration if it is on the classpath. If you use the starters for assembling dependencies, you have to exclude Logback and then include log4j 2 instead. If you do not use the starters, you need to provide (at least) spring-jcl in addition to Log4j 2
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<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-log4j2</artifactId>
</dependency>
In addition to its default XML configuration format, Log4j 2 also supports YAML and JSON configuration files. To configure Log4j 2 to use an alternative configuration file format, add the appropriate dependencies to the classpath and name your configuration files to match your chosen file format, as shown in the following example:
<!-- 解析yml配置 -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.dataformat</groupId>
<artifactId>jackson-dataformat-yaml</artifactId>
</dependency>
日志级别
level:日志输出级别，共有8个级别，按照从低到高为：All < Trace < Debug < Info < Warn < Error < Fatal < OFF.
程序会打印高于或等于所设置级别的日志，设置的日志等级越高，打印出来的日志就越少。
简单的入门程序 helloword！
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
public class HelloWorld {
private static final Logger logger = LogManager.getLogger("HelloWorld");
public static void main(String[] args) {
logger.info("Hello, World!");
}
}
log4j.yml
Configuration:
status: warn # status用来指定log4j本身的打印日志的级别.
name: YAMLConfigTest
properties:
property:
name: filename
value: target/test-yaml.log
thresholdFilter:
level: debug
appenders:
Console:
name: STDOUT
target: SYSTEM_OUT
PatternLayout:
Pattern: "%m%n"
File:
name: File
fileName: ${filename}
PatternLayout:
Pattern: "%d %p %C{1.} [%t] %m%n"
Filters:
ThresholdFilter:
level: error
Loggers: # 节点用来单独指定日志的形式，比如要为指定包下的class指定不同的日志级别等。
logger:
-
name: org.apache.logging.log4j.test1
level: debug
additivity: false
ThreadContextMapFilter:
KeyValuePair:
key: test
value: 123
AppenderRef:
ref: STDOUT
-
name: org.apache.logging.log4j.test2
level: debug
additivity: false
AppenderRef:
ref: File
Root:
level: error
AppenderRef:
ref: STDOUT
