技术介绍（1）邮件，定时器

最新推荐文章于 2021-05-15 15:16:59 发布

原创最新推荐文章于 2021-05-15 15:16:59 发布 · 257 阅读

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本文介绍如何使用Spring Task进行定时任务调度，包括配置、注解使用及cron表达式的解析。同时，详细讲解了集成邮件功能的方法，从依赖引入到配置文件设置，再到测试代码示例。

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1.Spring-Task 定时调度任务

Spring-task，我们可以将它比作一个轻量级的Quartz，使用简单方便，
除spring相关的包外不需要额外的包，
而且支持注解，主要用于定时处理一些业务的框架

1.1.配置

<!-- 支持异步方法执行 -->
<task:executor id="myexecutor" pool-size="10"  />
<!--开启这个配置，spring才能识别@Scheduled注解-->
<task:annotation-driven executor="myexecutor"/>

1.2.使用@Scheduled 定时任务注解

创建task包和MyTask类，并扫描包
<context:component-scan base-package="cn.itsource.task" />

代码

@Component
public class MyTask {
    @Autowired
    UserService userService;
    // 每2秒执行一次
    @Scheduled(cron = "0/2 * *  * * ? ")
    public void test(){
        System.out.println(new Date()+"==="+userService.queryAllList().size());
    }
}
cron表达式 http://cron.qqe2.com/

2.集成邮件

maven-jar包依赖

2.2. maven-jar包依赖
<!-- 邮件-->
<dependency>
   <groupId>javax.mail</groupId>
   <artifactId>mail</artifactId>
   <version>1.4.7</version>
</dependency>

2.3spring-msg.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:task="http://www.springframework.org/schema/task"
       xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.1.xsd
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.1.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.1.xsd
        http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-4.1.xsd">

    <!-- 支持异步方法执行 -->
    <task:executor id="myexecutor" pool-size="10"  />
    <!--开启这个配置，spring才能识别@Scheduled注解-->
    <task:annotation-driven executor="myexecutor"/>


    <bean id="emailSender" class="org.springframework.mail.javamail.JavaMailSenderImpl">
        <!--邮件服务器-->
        <property name="host" value="${email.host}"/>
        <property name="protocol" value="${email.protocol}"/>
        <!--邮箱号码-->
        <property name="username" value="${email.username}"/>
        <!--邮箱授权码-->
        <property name="password" value="${email.password}"/>
        <property name="defaultEncoding" value="UTF-8"/>
        <property name="javaMailProperties">
            <props>
                <prop key="mail.smtp.auth">true</prop>
                <prop key="mail.smtp.timeout">25000</prop>
            </props>
        </property>

    </bean>
</beans>

2.4 spring-conifg.xml添加属性配置


<!-- 引入属性文件
<context:property-placeholder location="classpath:properties/jdbc.properties" />-->

<!-- 引入系统属性文件 -->
<bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
   <property name="locations">
      <list>
         <value>classpath:properties/dev.properties</value>
         <value>classpath:properties/jdbc.properties</value>
      </list>
   </property>
</bean>

2.5 测试

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class Email_Test {
    @Autowired
    JavaMailSenderImpl emailSender;
    @Autowired
    EmailUtill emailUtill;
    @Value("${email.username}")
    private String  username;


    // 简单邮件
    @Test
    public void SimpleMailMessage() throws Exception {
        SimpleMailMessage mailMessage = new SimpleMailMessage();
        mailMessage.setFrom(username);//        发送人
        mailMessage.setTo("605271504@qq.com");//          收件人
        mailMessage.setSubject("隐世集团");//               标题
        mailMessage.setText("隐无为-祝福你");            //            内容
        emailSender.send(mailMessage);
    }

    //  html 文件
    @Test
    public void htmlMailMessage() {
        MimeMessage mimeMsg = emailSender.createMimeMessage();
        try {
            String html = "<h1>隐世集团祝福你</h1>";
            MimeMessageHelper helper = new MimeMessageHelper(mimeMsg, true);
            helper.setTo(username);
            helper.setFrom("605271504@qq.com");
            helper.setSubject("隐世集团");
            helper.setText(html, true);
            emailSender.send(mimeMsg);
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}


1.5. 抽离成工具类

@Component
public class EmailUtill {
    @Autowired
    JavaMailSenderImpl emailSender;

    @Value("${email.username}")
    private String  username;

    //@Async
    public void sendMail(String sendTo,String title,String content) throws Exception {
        SimpleMailMessage mailMessage = new SimpleMailMessage();
        mailMessage.setFrom(username);//        发送人
        mailMessage.setTo(sendTo);//          收件人
        mailMessage.setSubject(title);//               标题
        mailMessage.setText(content);            //            内容
        emailSender.send(mailMessage);
    }

}

注意：加上这个注解@Component交给spring所管理
@Async 异步方法注解