log4j测试示例

引入依赖

 <!-- log4j -->
    <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
      <version>1.2.17</version>
    </dependency>

    <!-- slf4j -->
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-log4j12</artifactId>
      <version>1.7.25</version>
    </dependency>

    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <version>1.18.2</version>
    </dependency>

在resouces下加入log4.properties文件

### direct log messages to stdout ###
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.err
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

### direct messages to file mylog.log ###
log4j.appender.file=org.apache.log4j.FileAppender
log4j.appender.file.File=d:\\mylog.log
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

### set log levels - for more verbose logging change 'info' to 'debug' ###
### fatal error warn info debug trace
log4j.rootLogger=all, stdout

编写测试文件Log4jTest和Slf4jTest

import org.apache.log4j.Logger;
import org.junit.Test;

public class Log4jTest {

    // apache-log4j日志
    private final Logger LOGGER = Logger.getLogger(Log4jTest.class);

    /**
     * apache-log4j 日志输出
     */
    @Test
    public void testLog4j(){
        LOGGER.info("普通信息");
        LOGGER.error("普通错误");
        LOGGER.trace("堆栈信息");
        LOGGER.fatal("致命错误");
        LOGGER.warn("警告信息");
        LOGGER.debug("调试信息");
    }

}

import lombok.extern.slf4j.Slf4j;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

@Slf4j
public class Slf4jTest {

    private final Logger logger = LoggerFactory.getLogger(Slf4jTest.class);

    /**
     * apache-log4j 日志输出
     */
    @Test
    public void testLog4j(){
        logger.info("普通信息");
        logger.error("普通错误");
        logger.trace("堆栈信息");
        logger.warn("警告信息");
        logger.debug("调试信息");
    }

    /**
     * lombok 注解日志输出
     */
    @Test
    public void testLombok(){
        log.info("普通信息");
        log.error("普通错误");
        log.trace("堆栈信息");
        log.warn("警告信息");
        log.debug("调试信息");
    }
}