Contents

• Java打印日志

21.7. Java打印日志

pom.xml

<dependency>
           <groupId>org.apache.logging.log4j</groupId>
           <artifactId>log4j-core</artifactId>
           <version>2.6.2</version>
       </dependency>

       <dependency>
           <groupId>org.apache.logging.log4j</groupId>
           <artifactId>log4j-api</artifactId>
           <version>2.6.2</version>
       </dependency>

       <!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-slf4j-impl -->
       <dependency>
           <groupId>org.apache.logging.log4j</groupId>
           <artifactId>log4j-slf4j-impl</artifactId>
           <version>2.6.2</version>
       </dependency>

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

class Test_Logger {
    Logger log = LoggerFactory.getLogger(Test_Logger.class);

    public void test() {
        log.info("hello, my name is {}", "chengyi");
        log.warn("warring info 132xxxxxx");
        log.debug("debug info 21sdsxxxxxxxxxxxx");
        log.error("error info 213xxxxxxxxxxxxxxx");
    }

    public static void main(String[] args) {
        Test_Logger test_log = new Test_Logger();
        test_log.test();
    }
}