SpringBoot Logback根据日志级别分离日志

项目结构图如下

项目搭建

在Idea中点击File->New->Project->Spring Initializr，如下图

填写项目信息

修改pom.xml文件

添加junit测试依赖

<dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>4.12</version>
    <scope>test</scope>
</dependency>

引用文字

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

新增LoggerTest.java类

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 logger = LoggerFactory.getLogger(LoggerTest.class);
    @Test
    public void test1(){
        String name = "lzz";
        String password = "123456";
        log.debug("debug...");
        log.info("name:"+name+" password:"+password);
        log.info("name:{},password:{}",name,password);
        log.error("error...");
        log.warn("warn....");
    }
}

通过@Slf4j注解，替换了private final Logger logger = LoggerFactory.getLogger(LoggerTest.class)，指向了当前的类，我们可以直接通过log.输出日志。

新增logback-spring.xml文件

<?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>

    <!--根据日志级别分离日志，分别输出到不同的文件-->
    <appender name="fileInfoLog" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>ERROR</level>
            <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>logback.info.%d{yyyy-MM-dd}.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>logback.error.%d{yyyy-MM-dd}.log</fileNamePattern>
        </rollingPolicy>
    </appender>
    <root level="info">
        <appender-ref ref="consoleLog" />
        <appender-ref ref="fileInfoLog" />
        <appender-ref ref="fileErrorLog" />
    </root>
</configuration>

通过引用fileInfoLog和fileErrorLog实现对日志的隔离输出，并在项目的根路径下输出对应的日志文件。

文件输出展示

logback.error.2017-12-21.log展示如下

logback.info.2017-12-21.log展示如下

日志输出级别

根据Level的级别，优先级大的优先输出，所以日志输出的顺序是ERROR>WARN>INFO>DEBUG>TRACE。

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