How to quickly create an email task in SpringBoot project

1. First create a springboot project

提示：选择的java版本不要太高

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I chose Spring Web here

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2.Introduce related dependencies

只需要引入这一个依赖即可

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

3. Analyze source code

1. First we introduce the dependency and find the mail automatic configuration name according to the name - MailSenderAutoConfiguration

Please refer to SpringBoot automatic configuration principle

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2. After coming in, we see MailProperties.class, drill in, and find the content required to be configured.

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3. See that you need to configure the host name, user name, password, etc.

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4. Return to the previous level and drill into MailSenderJndiConfiguration

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You will find that there is an "email sending implementation class", we can call it

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4. Get email code

这里使用的qq邮箱

1. Open QQ mailbox, click Settings - Select Account - Click the first service to open

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2. Click to open and send a text message, and then get the authorization code

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3. Copy and paste the authorization code into spring.mail.password= in the configuration file, as shown in point 5

5.Configuration content

这里使用的是application.properties

#邮箱地址
spring.mail.username=2787567683@qq.com
#邮箱密码（授权码自行获取）
spring.mail.password=gsfqpsmmuwnfdhce
#主机名
spring.mail.host=smtp.qq.com

#开启加密验证
spring.mail.properties.mail.smtp.ssl.enable=true

6. Write code

这里我将发送邮件的功能封装为一个工具类

1.Write ToolUtil

/**
 * @Author liuyun
 * @Date 2023/3/6 11:16
 * @Version 1.0
 * 发送邮件工具类
 */

@Configuration//申明该配置
public class ToolUtil {
    
    
    
    //引入邮件发送实现类
    @Autowired
    JavaMailSenderImpl javaMailSender;

    /**
     *
     * @param html:是否支持多文本上传
     * @param subject：邮件标题
     * @param text：邮件主要内容
     * @param jpg：附件
     * @param jpgWay：附件路径
     * @param from：发件人邮箱地址
     * @param to：收件人邮箱地址
     * @throws MessagingException
     * 发送邮件
     */
    public void sendMail(Boolean html, String subject, String text, List<String> jpg, List<String> jpgWay, String from, String to) throws MessagingException {
    
    
        //一个复杂的邮件
        MimeMessage mimeMessage = javaMailSender.createMimeMessage();
        //组装
        MimeMessageHelper mailMessage = new MimeMessageHelper(mimeMessage,html);

        //正文
        mailMessage.setSubject(subject);
        mailMessage.setText(text);

        //附件，遍历得到的附件内容
        for (int i = 0; i < jpg.size(); i++) {
    
    
            for (int j = 0; j < jpgWay.size(); j++) {
    
    
                if (i==j){
    
    
                    mailMessage.addAttachment(jpg.get(i),new File(jpgWay.get(i)));
                }
            }
        }

        mailMessage.setFrom(from);
        mailMessage.setTo(to);


        javaMailSender.send(mimeMessage);
    }
}

2. Retrieval method

 @RequestMapping("/mailSend")
    public String mailSend() throws MessagingException {
    
    
		
		//邮件标题
        String subject = "入职申请";
        //邮件内容
        String text = "我申请入职腾讯高管";
        //发件人邮箱地址
        String from = "[email protected]";
        //收件人邮箱地址
        String to = "[email protected]";
        //附件内容
        List<String> jpgs = new ArrayList<>();
        jpgs.add("7.png");
        jpgs.add("q.jpeg");
        //附件路径
        List<String> jpgWays = new ArrayList<>();
        jpgWays.add("C:\\Users\\internet\\Desktop\\folder\\7.png");
        jpgWays.add("C:\\Users\\internet\\Desktop\\folder\\q.jpeg");

		//调取方法，将内容传进去
        toolUtil.sendMail(true,subject,text,jpgs,jpgWays,from,to);

        return "Success";
    }

7. Start, access, and successfully receive the email

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received e-mail

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This is the email task function; reference

Hope it helps you

`~感谢您的光临~`

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