Java中实现分布式定时任务的方法_java

    
      net.javacrumbs.shedlock
      shedlock-spring
      4.11.1
    

    
      net.javacrumbs.shedlock
      shedlock-provider-jdbc-template
      4.11.1
    

import net.javacrumbs.shedlock.core.LockProvider;
import net.javacrumbs.shedlock.provider.jdbctemplate.JdbcTemplateLockProvider;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.jdbc.core.JdbcTemplate;
import javax.annotation.Resource;
import javax.sql.DataSource;
import java.util.TimeZone;

/**
 * @descrition shedlock配置类
 * @since 2021-01-10 22:39
 */
@Configuration
public class ShedLockConfig {
  @Resource
  private DataSource dataSource;

  /**
   * @description
   * @date 2021/1/10 22:39
   */
  @Bean
  public LockProvider lockProvider() {
    return new JdbcTemplateLockProvider(
        JdbcTemplateLockProvider.Configuration.builder()
            .withJdbcTemplate(new JdbcTemplate(dataSource))
            .withTimeZone(TimeZone.getTimeZone("GMT+8"))
            .build()
    );
  }
}

CREATE TABLE shedlock (
  NAME VARCHAR ( 64 ) NOT NULL,
  lock_until TIMESTAMP ( 3 ) NOT NULL,
  locked_at TIMESTAMP ( 3 ) NOT NULL DEFAULT CURRENT_TIMESTAMP ( 3 ),
  locked_by VARCHAR ( 255 ) NOT NULL,
  PRIMARY KEY ( NAME ) 
);

import lombok.extern.slf4j.Slf4j;
import net.javacrumbs.shedlock.spring.annotation.SchedulerLock;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
import java.text.SimpleDateFormat;
import java.util.Date;


/**
 * @author shane
 * @date 2021/1/10 23:39
 */
@Slf4j
@Component
public class TestJob {
  /**
   * @description 每隔1min打印一次
   * @date 2021/1/10 23:39
   */
  @Scheduled(cron = "0 0/1 * * * ?")
  // lockAtMostFor为锁默认持有时间，会覆盖启动类中的默认持有时间
  @SchedulerLock(name = "demo", lockAtMostFor = "70m")
  public void print() throws InterruptedException {
    SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//设置日期格式
    log.warn("当前时间："+df.format(new Date()));
  }
}

@SpringBootApplication
@MapperScan("com.example.test.mapper")
@EnableScheduling
@EnableSchedulerLock(defaultLockAtMostFor = "10m") // 默认的锁的时间
public class TestApplication {

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

}