服务高峰期gc，导致服务不可用

一、logback简介：

二、 SpringBoot集成Logback

1. 创建项目：不做过多的描述，不会点这里
2. 导入pom依赖

<dependencies>

        <!-- Spring Boot Starter -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <!-- Spring Boot Starter Logging (默认已经包含在starter中) -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-logging</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

3. 编写logback.xml

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <!-- 控制台输出 -->
    <appender name="console" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>%white(%contextName - %d{yyyy-MM-dd HH:mm:ss}) %green([%c][%t][%L]) %highlight(%-5level) - %yellow(%msg%n)</pattern>
        </encoder>
    </appender>
    <!-- 文件输出 -->
    <appender name="file" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>logs/springboot.log</file>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>logs/springboot-%d{yyyy-MM-dd}.log</fileNamePattern>
            <maxHistory>30</maxHistory>
        </rollingPolicy>
    <!--文件中的输出格式-->
        <encoder>
            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%c][%t][%L][%p] - %msg%n</pattern>
        </encoder>
    </appender>
    <!-- 日志级别配置 -->
    <root level="info">
        <appender-ref ref="console"/>
        <appender-ref ref="file"/>
    </root>
</configuration>

4. 编写Controller层

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @Author Ysl
 * @Date 2024/5/22
 * @name Myselflean
 **/
@RestController
public class LogController {

    private static final Logger log = LoggerFactory.getLogger(LogController.class);

    @GetMapping("/log")
    public String log() {
        log.info("开始输出日志--------start");
        String msg = "编写业务代码";
        log.info("日志输出结束--------end:"+ msg);
        return msg;
    }
}

5. 输入网址进行访问：http://localhost:8080/log
   
6. 控制台输出后会出现logs文件夹，里面存放.log日志
   
   
7. 如果需要更改输出格式，可在logback.xml中进行修改配置，可查相关资料完善。