SpringBoot 动态设置 logback 日志的级别

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.olive</groupId>
    <artifactId>valid-demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.8.RELEASE</version>
        <relativePath /> 
    </parent>
    <name>valid-demo</name>
    <url>http://maven.apache.org</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

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

    </dependencies>
</project>

<?xml version="1.0" encoding="UTF-8"?>
<!--
scan：当此属性设置为true时，配置文件如果发生改变，将会被重新加载，默认值为true。
scanPeriod：设置监测配置文件是否有修改的时间间隔，如果没有给出时间单位，默认单位是毫秒当scan为true时，此属性生效。默认的时间间隔为1分钟。
debug：当此属性设置为true时，将打印出logback内部日志信息，实时查看logback运行状态。默认值为false。
-->
<configuration scan="false" scanPeriod="60 seconds" debug="false">

    <!-- ch.qos.logback.core.ConsoleAppender 表示控制台输出 -->
    <appender name="stdout" class="ch.qos.logback.core.ConsoleAppender">
        <!--
            日志输出格式：
                %d表示日期时间，
                %thread表示线程名，
                %-5level：级别从左显示5个字符宽度
                %logger{50} 表示logger名字最长50个字符，否则按照句点分割。 
                %msg：日志消息，
                %n是换行符
        -->
        <layout class="ch.qos.logback.classic.PatternLayout">
            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%n</pattern>
        </layout>
    </appender>

    <root level="info">
        <!-- 控制台输出日志-->
        <appender-ref ref="stdout" />
    </root>
</configuration>

package com.olive.controller;

import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.slf4j.impl.StaticLoggerBinder;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import ch.qos.logback.classic.Level;
import ch.qos.logback.classic.LoggerContext;

@RestController
public class LoggerController {

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

     // TODO

}

@RequestMapping("/logger/print")
public Map loggerPrint(){
    Map result = new HashMap();
    result.put("code", 200);
    result.put("msg", "success");

    logger.debug("loggerPrint debug>>>>");
    logger.info("loggerPrint info>>>>");
    logger.warn("loggerPrint warn>>>>");
    logger.error("loggerPrint error>>>>");

    return result;
}

@RequestMapping("/logger/printAllLogger")
public Map printAllLogger(){
    Map result = new HashMap();
    result.put("code", 200);
    result.put("msg", "success");

    LoggerContext loggerContext = (LoggerContext) LoggerFactory.getILoggerFactory();
    List<ch.qos.logback.classic.Logger> loggers = loggerContext.getLoggerList();
    Iterator<ch.qos.logback.classic.Logger> iter = loggers.iterator();
    System.out.println("printAllLogger begin>>>>>>>>");
    while(iter.hasNext()){
        System.out.println(iter.next().getName());
    }
    System.out.println("printAllLogger end>>>>>>>>");
    return result;
}

@RequestMapping("/logger/level")
public Map loggerLevelChange(String level){
    Map result = new HashMap();
    result.put("code", 200);
    result.put("msg", "success");

    String loggerFactoryClassStr = StaticLoggerBinder.getSingleton().getLoggerFactoryClassStr();
    System.out.println("loggerFactoryClassStr>>>>" + loggerFactoryClassStr);

    LoggerContext loggerContext = (LoggerContext) LoggerFactory.getILoggerFactory();
    ch.qos.logback.classic.Logger logger = loggerContext.getLogger("ROOT");
    switch (level) {
    case "debug":
        logger.setLevel(Level.DEBUG);
        break;
    case "info":
        logger.setLevel(Level.INFO);
        break;
    case "warn":
        logger.setLevel(Level.WARN);
        break;
    case "error":
        logger.setLevel(Level.ERROR);
        break;
    default:
        break;
    }
    return result;
}

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Application 
{
    public static void main( String[] args )
    {
        SpringApplication.run(Application.class, args);
    }
}

printAllLogger begin>>>>>>>>
ROOT
com.olive.Application
com.olive.controller.LoggerController
// 省略一万条记录
printAllLogger end>>>>>>>>

2021-05-12 22:10:27.959 [http-nio-8080-exec-3] INFO  com.olive.controller.LoggerController - loggerPrint info>>>>
2021-05-12 22:10:27.959 [http-nio-8080-exec-3] WARN  com.olive.controller.LoggerController - loggerPrint warn>>>>
2021-05-12 22:10:27.960 [http-nio-8080-exec-3] ERROR com.olive.controller.LoggerController - loggerPrint error>>>>