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  • SpringBoot和任务

    1 异步任务

    1.1 概述

    • 在Java应用中,绝大多数情况下都是通过同步的方式来实现交互处理的;但是在处理和第三方系统交互的时候,容易造成响应迟缓的情况,之前大部分都是使用多线程来完成此类任务,其实,在Spring3.x之后,就已经内置了@Async来完美解决这个问题。

    1.2 使用步骤

    • 使用@EnableAysnc注解开启异步功能。
    • 将@Async注解标注在需要异步的类或方法上。

    1.3 应用示例

    • 导入所需要的jar包的Maven坐标:
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    
    • 使用@EnableAysnc注解开启异步功能:
    package com.sunxiaping.springboot;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.scheduling.annotation.EnableAsync;
    
    @SpringBootApplication
    @EnableAsync //开启异步注解功能
    public class SpringbootApplication {
    
        public static void main(String[] args) {
            SpringApplication.run(SpringbootApplication.class, args);
        }
    
    }
    
    • AsyncService.java:
    package com.sunxiaping.springboot.service;
    
    import org.springframework.scheduling.annotation.Async;
    import org.springframework.stereotype.Service;
    
    @Service
    public class AsyncService {
    
        @Async
        public void hello(){
            try {
                Thread.sleep(3000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println("。。。。数据处理中。。。。");
        }
    }
    
    • AsyncController.java:
    package com.sunxiaping.springboot.web;
    
    import com.sunxiaping.springboot.service.AsyncService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    @RequestMapping(value = "/async")
    public class AsyncController {
    
        @Autowired
        private AsyncService asyncService;
    
        @GetMapping(value = "/hello")
        public String hello() {
            asyncService.hello();
            return "成功";
        }
    
    }
    

    2 定时任务

    2.1 概述

    • 项目开发中经常需要执行一些定时任务,比如需要在每天凌晨的时候,分析一次前一天的日志信息。Spring为我们提供了异步执行任务调度的方式,提供TaskExecutor、TaskScheduler接口。

    2.2 使用步骤

    • 使用@EnableScheduling注解开启定时任务功能。
    • 将@Scheduled注解标注需要定时的类或方法上。

    2.3 应用示例

    • 导入所需要的jar包的Maven坐标:
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    
    • 使用@EnableScheduling注解开启定时任务功能:
    package com.sunxiaping.springboot;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.scheduling.annotation.EnableScheduling;
    
    @SpringBootApplication
    @EnableScheduling
    public class SpringbootApplication {
    
        public static void main(String[] args) {
            SpringApplication.run(SpringbootApplication.class, args);
        }
    
    }
    
    • ScheduledService.java:
    package com.sunxiaping.springboot.service;
    
    import org.springframework.scheduling.annotation.Scheduled;
    import org.springframework.stereotype.Service;
    
    @Service
    public class ScheduledService {
    
        @Scheduled(cron = "*/5 * * * * ?")
        public void hello(){
            System.out.println("hello");
        }
    }
    

    3 邮件任务

    3.1 导入相关jar包的Maven坐标

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-mail</artifactId>
    </dependency>
    

    3.2 配置application.yml

    spring:
     mail:
        username: 1900919313@qq.com
        password: unwcjvjwuknlbffb #授权码
        host: smtp.qq.com
        properties:
          mail:
            smpt:
              ssl:
                enable: true
    

    3.3 测试

    package com.sunxiaping.springboot;
    
    import org.junit.Test;
    import org.junit.runner.RunWith;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.boot.test.context.SpringBootTest;
    import org.springframework.mail.SimpleMailMessage;
    import org.springframework.mail.javamail.JavaMailSender;
    import org.springframework.mail.javamail.MimeMessageHelper;
    import org.springframework.test.context.junit4.SpringRunner;
    
    import javax.mail.MessagingException;
    import javax.mail.internet.MimeMessage;
    import java.io.File;
    
    @SpringBootTest
    @RunWith(SpringRunner.class)
    public class SpringbootApplicationTests {
    
        @Autowired
        private JavaMailSender mailSender;
    
        /**
         * 简单邮件
         */
        @Test
        public void test(){
    
            SimpleMailMessage message = new SimpleMailMessage();
            //设置邮件
            message.setSubject("通知--开会啦");
            message.setText("一会开会啊");
            message.setTo("1975356467@qq.com");
            message.setFrom("1900919313@qq.com");
    
            mailSender.send(message);
    
        }
    
        /**
         * 复杂邮件
         */
        @Test
        public void test2() throws MessagingException {
            MimeMessage mimeMessage = mailSender.createMimeMessage();
    
            MimeMessageHelper helper = new MimeMessageHelper(mimeMessage,true);
    
            //设置邮件
            helper.setSubject("通知--开会啦");
            helper.setText("<b style='color:red'>今天开会啦</b>",true);
            helper.setTo("1975356467@qq.com");
            helper.setFrom("1900919313@qq.com");
    
            helper.addAttachment("1.jpg", new File("C:\Users\Administrator\Pictures\1.png"));
    
            mailSender.send(mimeMessage);
        }
        
    }
    
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  • 原文地址:https://www.cnblogs.com/xuweiweiwoaini/p/13716282.html
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