此处以数据源配置为例子，实际任何属性都可。
此方式，可解决修改配置文件，还要重新打包的问题
并且配置文件中的数据修改后，不需要重启服务器，也可获取最新修改后的配置信息。
步骤一：
启动类添加以下代码：
开启一个线程去定时刷新配置文件
@SpringBootApplication(exclude = { DataSourceAutoConfiguration.class })public class MyApplication implements ApplicationRunner{public static void main(String[] args) {// System.setProperty("spring.devtools.restart.enabled", "false");SpringApplication.run(MyApplication.class, args);System.out.println("启动成功");}/**----------------------------------------------- 添加start ---------------------------------------------*/private static ScheduledExecutorService executorService = Executors.newScheduledThreadPool(1);private static String profile;@Overridepublic 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) {System.out.println("加载配置文件application.yml异常");}// 开启定时刷新内存中配置文件内容System.out.println("refresh config file start");executorService.scheduleAtFixedRate(RuoYiApplication::updateConfVal, 0, 10, TimeUnit.SECONDS);System.out.println("refresh config file end");}/*** 更新配置文件值*/private static void updateConfVal(){try{Map lhm = YmlUtil.loadYaml("application-" + profile + ".yml");String url = YmlUtil.getValByKey(lhm,"spring.datasource.druid.master.url").toString();String username = YmlUtil.getValByKey(lhm,"spring.datasource.druid.master.username").toString();String password = YmlUtil.getValByKey(lhm,"spring.datasource.druid.master.password").toString();DruidDynamicConfig instance = DruidDynamicConfig.getInstance();if (!instance.getDynamicUrl().equals(url)) {instance.setDynamicUrl(url);}if (!instance.getDynamicUsername().equals(username)) {instance.setDynamicUsername(username);}if (!instance.getDynamicPassword().equals(password)) {instance.setDynamicPassword(password);}} catch (Exception e){// System.out.println("更新配置文件值异常: ", e);}/**----------------------------------------------- 添加end ---------------------------------------------*/}
步骤二：
修改属性的实例化，添加此实体类
/*** 动态数据源配置实体类*/public class DruidDynamicConfig { private static String url;private static String username;private static String password;private final static DruidDynamicConfig dynamic;static {dynamic = new DruidDynamicConfig();}private DruidDynamicConfig() {url = "";username = "";password = "";}public static DruidDynamicConfig getInstance() {return dynamic;}public String getDynamicUrl() {return url;}public void setDynamicUrl(String url) {this.url = url;}public String getDynamicUsername() {return username;}public void setDynamicUsername(String username) {this.username = username;}public String getDynamicPassword() {return password;}public void setDynamicPassword(String password) {this.password = password;}}
步骤三：
添加Yml工具类：YmlUtil.java
import java.io.File;import java.io.FileInputStream;import java.io.InputStream;import java.util.LinkedHashMap;import java.util.Map;import org.yaml.snakeyaml.Yaml;/*** @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】*/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;}}
步骤四：
将 application.yml 和 application-dev.yml 文件进行拷贝，放置到jar同目录下的config文件夹中(没有config创建即可)
这样就完成了动态加载yml配置信息的工作了，只要yml文件有修改，就会动态去监听并加载。
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