新增: 初始化工程

.gitignore

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+HELP.md
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<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
+         https://maven.apache.org/xsd/maven-4.0.0.xsd">
+
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.7.7</version>
+        <relativePath/>
+    </parent>
+
+    <groupId>space.caoshd</groupId>
+    <artifactId>dynamic-schedule</artifactId>
+    <version>1.0.0-SNAPSHOT</version>
+
+    <name>dynamic-schedule</name>
+
+    <properties>
+        <java.version>1.8</java.version>
+    </properties>
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <scope>provided</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>

src/main/java/space/caoshd/dyn_sch/DynamicScheduleApplication.java

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+package space.caoshd.dyn_sch;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.scheduling.annotation.EnableScheduling;
+
+@SpringBootApplication
+@EnableScheduling
+public class DynamicScheduleApplication {
+    public static void main(String[] args) {
+        SpringApplication.run(DynamicScheduleApplication.class, args);
+    }
+}

src/main/java/space/caoshd/dyn_sch/schedule/DynamicSchedule.java

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+package space.caoshd.dyn_sch.schedule;
+
+
+import lombok.Data;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.scheduling.annotation.SchedulingConfigurer;
+import org.springframework.scheduling.config.ScheduledTaskRegistrar;
+import org.springframework.scheduling.support.CronTrigger;
+import org.springframework.scheduling.support.PeriodicTrigger;
+import org.springframework.stereotype.Component;
+
+import java.time.LocalDateTime;
+
+@Data
+@Slf4j
+@Component
+public class DynamicSchedule implements SchedulingConfigurer {
+
+    @Value("${app.schedule.cron: */1 * * * * ?}")
+    private String cron;
+
+    @Value("${app.schedule.period: 1000}")
+    private Long period;
+
+    @Override
+    public void configureTasks(ScheduledTaskRegistrar taskRegistrar) {
+        // 使用 cron 表达式 动态设置循环间隔
+        taskRegistrar.addTriggerTask(
+            () -> log.info("current time trigger by cron  : {}", LocalDateTime.now()),
+            context -> new CronTrigger(cron).nextExecutionTime(context)
+        );
+
+        // 使用 固定周期 动态设置循环间隔
+        taskRegistrar.addTriggerTask(
+            () -> log.info("current time trigger by period: {}", LocalDateTime.now()),
+            context -> new PeriodicTrigger(period).nextExecutionTime(context)
+        );
+    }
+
+}

src/test/java/space/caoshd/dyn_sch/DemoApplicationTests.java

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+package space.caoshd.dyn_sch;
+
+import lombok.extern.slf4j.Slf4j;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import space.caoshd.dyn_sch.schedule.DynamicSchedule;
+
+import java.util.concurrent.TimeUnit;
+
+@SpringBootTest
+@Slf4j
+class DemoApplicationTests {
+    @Autowired
+    DynamicSchedule dynamicSchedule;
+
+    @Test
+    public void updateCron() throws Exception {
+        // 先是每隔一秒执行一次
+        TimeUnit.SECONDS.sleep(10);
+
+        // 十秒钟后 更新 cron 配置
+        String cron = "*/5 * * * * ?";
+        log.info("update cron: {}", cron);
+
+        dynamicSchedule.setCron(cron);
+
+        // 20 秒后 程序关闭
+        TimeUnit.SECONDS.sleep(20);
+    }
+
+    @Test
+    public void updatePeriod() throws Exception {
+        // 先是每隔一秒执行一次
+        TimeUnit.SECONDS.sleep(10);
+
+        // 十秒钟后 更新 period 配置
+        Long period = 5000L;
+        log.info("update period: {}", period);
+
+        dynamicSchedule.setPeriod(period);
+
+        // 20 秒后 程序关闭
+        TimeUnit.SECONDS.sleep(20);
+    }
+
+}