SpringBoot怎么动态修改yml配置文件

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前言

记录下SpringBoot修改yml配置文件后无需重启服务的方式（打包后生效），效果如下：

具体实现

实现代码

pom.xml

            org.springframework.boot        spring-boot-starter-web                org.projectlombok        lombok    

application.yml

#端口号server:  port: 31091spring:  profiles:    active: dev

application-dev.yml

coisini:    mail: maggieq8324@gmail.com

InitializationConfig.java

import lombok.extern.slf4j.Slf4j;import org.springframework.boot.ApplicationArguments;import org.springframework.boot.ApplicationRunner;import org.springframework.stereotype.Component;import java.util.Map;import java.util.concurrent.Executors;import java.util.concurrent.ScheduledExecutorService;import java.util.concurrent.TimeUnit;/** * @Description spring容器初始化完成后进行一些其他初始化操作 * @date Mar 24, 2022 * @version 1.0 */@Slf4j@Componentpublic class InitializationConfig implements ApplicationRunner {    private static ScheduledExecutorService executorService = Executors.newScheduledThreadPool(1);    private static String profile;    @Override    public void run(ApplicationArguments applicationArguments) throws Exception {        scheduleUpdateConf();    }    private void scheduleUpdateConf() {        try {            Map lhm = YmlUtil.loadYaml("application.yml");            profile = (String) YmlUtil.getValByKey(lhm, "spring.profiles.active");        } catch (Exception e) {            log.error("加载配置文件application.yml异常");        }        // TODO 开启定时刷新内存中配置文件内容        log.info("refresh config file start");        executorService.scheduleAtFixedRate(InitializationConfig::updateConfVal, 0, 10, TimeUnit.SECONDS);        log.info("refresh config file end");    }    /**     * 更新配置文件值     */    private static void updateConfVal(){        try{            Map lhm = YmlUtil.loadYaml("application-" + profile + ".yml");            String mail = YmlUtil.getValByKey(lhm,"coisini.mail").toString();            DynamicMailConfig instance = DynamicMailConfig.getInstance();            if (!instance.getDynamicMail().equals(mail)) {                instance.setDynamicMail(mail);                log.info("实时配置mail更新：" + instance.getDynamicMail());            }        } catch (Exception e){            log.error("更新配置文件值异常: ", e);        }    }}

DynamicMailConfig.java

/** * @Description 动态邮箱单例 * @date Mar 24, 2022 * @version 1.0 */public class DynamicMailConfig {    private static String mail;    private final static DynamicMailConfig dynamic;    static {        dynamic = new DynamicMailConfig();    }    private DynamicMailConfig() {        mail = "";    }    public static DynamicMailConfig getInstance() {        return dynamic;    }    public String getDynamicMail() {        return mail;    }    public void setDynamicMail(String mail) {        this.mail = mail;    }}

YmlUtil.java

import org.yaml.snakeyaml.Yaml;import java.io.File;import java.io.FileInputStream;import java.io.InputStream;import java.util.LinkedHashMap;import java.util.Map;/** * @Description 动态操作yml配置文件工具类 *  【需要将config配置文件夹和项目jar包放在同级别目录下，这样修改config下的配置文件后，jvm才能及时得获取新的配置】 * @date Mar 24, 2022 * @version 1.0 */public class YmlUtil {    public static LinkedHashMap loadYaml(String fileName) throws Exception{        String path = System.getProperty("user.dir");        File file = new File(path + "/config/" + fileName);        InputStream in;        if (file.exists()) {            in = new FileInputStream(path + "/config/" + fileName);        } else {            // TODO 如果没有config文件夹，则从项目的resources目录下找            in = YmlUtil.class.getClassLoader().getResourceAsStream(fileName);        }        LinkedHashMap lhm = new Yaml().loadAs(in, LinkedHashMap.class);        return lhm;    }    public static Object getValByKey(Map lhm, String key) throws Exception{        String[] keys = key.split("[.]");        Map ymlInfo = lhm;        for (int i = 0; i < keys.length; i++) {            Object value = ymlInfo.get(keys[i]);            if (i < keys.length - 1) {                ymlInfo = (Map) value;            } else if (value == null) {                throw new Exception("key不存在");            } else {                return value;            }        }        return null;    }}

测试

TestController.java

@Slf4j@RestControllerpublic class TestController {    @GetMapping("/getDynamicMail")    public String getDynamicMail() {        String dynamicMail = DynamicMailConfig.getInstance().getDynamicMail();        log.info("getDynamicMail: " + dynamicMail);        return dynamicMail;    }}

打包后配置文件放在与jar同级的config目录下

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