java 日志框架的选择Log4j->SLF4j->Logback

Log4j->SLF4j->Logback是同一个人开发的

import lombok.extern.slf4j.Slf4j;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

@RunWith(SpringRunner.class)
@SpringBootTest
@Slf4j
public class LoggerTest {

   // private  final Logger log= LoggerFactory.getLogger(LoggerTest.class);
    @Test
    public void test1(){
        log.debug("debug test...");
        log.info("info test...");
        log.error("error test...");
        String name="kelly";
        String password="123456";
        log.error("error test...name:{},password:{}",name,password); //占位符使用
    }

}

lombok的使用

IntelliJ IDEA lombok插件的安装和使用：
https://jingyan.baidu.com/article/0a52e3f4e53ca1bf63ed725c.html
用注解@Slf4j代替private final Logger log= LoggerFactory.getLogger(LoggerTest.class);
使用时直接用log去记录日志

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

Logback的配置

1.application.yml配置

logging:
  file: D:/logs/test/log.txt

2.logback-spring.xml配置(建议用这种)

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <appender name="consoleLog" class="ch.qos.logback.core.ConsoleAppender">
       <layout class="ch.qos.logback.classic.PatternLayout">
           <pattern>
               %d - %msg%n
           </pattern>
       </layout>
    </appender>

    <appender name="fileInfoLog" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>ERROR</level><!--该过滤器过滤掉ERROR-->
            <onMatch>DENY</onMatch>
            <onMismatch>ACCEPT</onMismatch>
        </filter>
        <encoder>
            <pattern>
                %msg%n
            </pattern>
        </encoder>
        <!--滚动策略-->
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <!--路径-->
            <fileNamePattern>d:/logs/test/info.%d.log</fileNamePattern>
        </rollingPolicy>
    </appender>

    <appender name="fileErrorLog" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
            <level>ERROR</level>
        </filter>
        <encoder>
            <pattern>
                %msg%n
            </pattern>
        </encoder>
        <!--滚动策略-->
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <!--路径-->
            <fileNamePattern>d:/logs/test/error.%d.log</fileNamePattern>
        </rollingPolicy>
    </appender>

    <root level="debug">
        <appender-ref ref="consoleLog" />
        <appender-ref ref="fileInfoLog" />
        <appender-ref ref="fileErrorLog" />
    </root>
</configuration>