SpringBoot——异步、定时、发送邮件

一、异步任务

在异步执行的函数上使用注解@Async，并在主配置类上启用（@EnableAsync）

@Service
public class AsyncService {

    @Async
    @Scheduled(cron = "")  //定时任务
    public void hello(){
        try {
            Thread.sleep(3000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println("异步：hello!");
    }
}

@RestController
public class AsyncController {

    @Autowired
    AsyncService asyncService;

    @RequestMapping("/hello")
    public String hello(){
        asyncService.hello();
        return "hello world!";
    }
}

@EnableAsync  //启用异步任务
@EnableScheduling  //启用定时任务
@SpringBootApplication
public class Springboot20200603Application {

    public static void main(String[] args) {
        SpringApplication.run(Springboot20200603Application.class, args);
    }

}

二、定时任务

在需要定时执行的函数上添加注解@Scheduled(cron = “”)
cron是定时表达式：
@Scheduled(cron=“0 */5 * * * ?”) //每5分钟执行一次
@Scheduled(cron=“0 */1 * * * ?”) //每1分钟执行一次

三、发送邮件

1.在pom文件中添加依赖

		<dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-mailartifactId>
        dependency>

2.配置邮件服务器

spring.mail.username=ning0539@foxmail.com  
spring.mail.password=qtfohyuziiszbiic   
spring.mail.host=smtp.qq.com 

3.使用JavaMailSenderImpl操作邮件发送

class Springboot20200603ApplicationTests {

    @Autowired
    JavaMailSenderImpl javaMailSender;

    /**
     * 发送简单邮件
     */
    @Test
    void contextLoads() {
        SimpleMailMessage message = new SimpleMailMessage();
        message.setSubject("测试邮箱服务器");//邮件主题
        message.setText("测试邮件。");//邮件内容
        message.setTo("wang526132456@163.com");//收件人邮箱地址
        message.setFrom("ning0539@foxmail.com");//发件人邮箱地址

        javaMailSender.send(message);
    }


    /**
     * 发送复杂邮件：附件
     */
    @Test
    void sendMail() throws Exception {
        MimeMessage mimeMessage = javaMailSender.createMimeMessage();
        MimeMessageHelper helper = new MimeMessageHelper(mimeMessage,true);

        helper.setSubject("测试邮箱服务器");
        helper.setText("测试复杂邮件。",true);//参数true：是否为html内容
        helper.setTo("wang526132456@163.com");
        helper.setFrom("ning0539@foxmail.com");

        helper.addAttachment("1.jpg",new File("C:\\Users\\K\\Pictures\\1.jpg"));//附件
        helper.addAttachment("2.jpg",new File("C:\\Users\\K\\Pictures\\2.jpg"));

        javaMailSender.send(mimeMessage);
    }

}