<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

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

  <name>spring-boot-scheduled</name>
  <description>Demo project for Spring Boot</description>

  <!-- 阿里云maven仓库 -->
  <repositories>
    <repository>
      <id>public</id>
      <name>aliyun nexus</name>
      <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
      <releases>
        <enabled>true</enabled>
      </releases>
    </repository>
  </repositories>
  <pluginRepositories>
    <pluginRepository>
      <id>public</id>
      <name>aliyun nexus</name>
      <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
      <releases>
        <enabled>true</enabled>
      </releases>
      <snapshots>
        <enabled>false</enabled>
      </snapshots>
    </pluginRepository>
  </pluginRepositories>

  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.4.5.RELEASE</version>
    <relativePath /> <!-- lookup parent from repository -->
  </parent>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <java.version>1.8</java.version>
  </properties>

  <dependencies>
    <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>

  <build>
    <plugins>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
      </plugin>
    </plugins>
  </build>
</project>

package com.example;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
@Component
public class ExampleTimer {
 SimpleDateFormat dateFormat = new SimpleDateFormat("HH:mm:ss");
 @Scheduled(fixedRate = 10000)
     public void timerRate() {
  System.out.println(dateFormat.format(new Date()));
 }
 //第一次延迟1秒执行，当执行完后2秒再执行
 @Scheduled(initialDelay = 1000, fixedDelay = 2000)
     public void timerInit() {
  System.out.println("init : "+dateFormat.format(new Date()));
 }
 //每天20点16分50秒时执行
 @Scheduled(cron = "50 16 20 * * ?")
     public void timerCron() {
  System.out.println("current time : "+ dateFormat.format(new Date()));
 }
}

package com.example;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.scheduling.annotation.EnableScheduling;
@SpringBootApplication
@EnableScheduling
public class SpringBootScheduledApplication {
 public static void main(String[] args) {
  SpringApplication.run(SpringBootScheduledApplication.class, args);
 }
}

20:16:27
init : 20:16:28
init : 20:16:30
init : 20:16:32
init : 20:16:34
init : 20:16:36
20:16:37
init : 20:16:38
init : 20:16:40
init : 20:16:42
init : 20:16:44
init : 20:16:46
20:16:47
init : 20:16:48
current time : 20:16:50
init : 20:16:50
init : 20:16:52
init : 20:16:54