spring boot 邮件发送

1.首先开启邮件传输协议SMTP协议，设定授权登陆密码。

2.添加gradle依赖：compile('org.springframework.boot:spring-boot-starter-mail')

3.自动化配置，在application.properties中配置相应的属性内容。

spring.mail.host=smtp.qq.com  --->根据使用的邮箱类型
spring.mail.username=用户名     
spring.mail.password=密码
spring.mail.properties.mail.smtp.auth=true
spring.mail.properties.mail.smtp.starttls.enable=true
spring.mail.properties.mail.smtp.starttls.required=true

//附上几种邮件发送的代码，如下

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.io.FileSystemResource;
import org.springframework.mail.SimpleMailMessage;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.MimeMessageHelper;
import org.springframework.stereotype.Service;
import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;
import java.io.File;

@Service
public class MailService {
    private final Logger logger = LoggerFactory.getLogger(this.getClass());
    @Autowired
    private JavaMailSender sender;
    private String from = "18565772381@163.com";
    private String to = "sam.cheng@valorosoltd.com";
    String subject ="邮件测试";
    String content="邮件测试内容";


    /**
     * 发送纯文本的简单邮件
     *
     * @param to
     * @param subject
     * @param content
     */
    public void sendSimpleMail() {
        SimpleMailMessage message = new SimpleMailMessage();
        message.setFrom(from);
          //若发送至多个邮箱，setTo(String[] to)
        message.setTo(to);
        message.setSubject(subject);
        message.setText(content);

        try {
            sender.send(message);
            logger.info("简单邮件已经发送。");
        } catch (Exception e) {
            logger.error("发送简单邮件时发生异常！", e);
        }
    }
    

    /**
     * 发送html格式的邮件
     *
     * @param to
     * @param subject
     * @param content
     */
    public void sendHtmlMail() {
        MimeMessage message = sender.createMimeMessage();

        try {
            //true表示需要创建一个multipart message
            MimeMessageHelper helper = new MimeMessageHelper(message, true);
            helper.setFrom(from);
            helper.setTo(to);
            helper.setSubject(subject);
            helper.setText(content, true);

            sender.send(message);
            logger.info("html邮件已经发送。");
        } catch (MessagingException e) {
            logger.error("发送html邮件时发生异常！", e);
        }
    }

    /**
     * 发送带附件的邮件
     */
    public void sendAttachmentsMail() {
        MimeMessage message = sender.createMimeMessage();
        String filePath="C:\Users\161209\Desktop\邮件测试.txt";

        try {
            //true表示需要创建一个multipart message
            MimeMessageHelper helper = new MimeMessageHelper(message, true);
            helper.setFrom(from);
            helper.setTo(to);
            helper.setSubject(subject);
            helper.setText(content, true);

            FileSystemResource file = new FileSystemResource(new File(filePath));
            String fileName = filePath.substring(filePath.lastIndexOf(File.separator));
            helper.addAttachment(fileName, file);

            sender.send(message);
            logger.info("带附件的邮件已经发送。");
        } catch (MessagingException e) {
            logger.error("发送带附件的邮件时发生异常！", e);
        }
    }


    /**
     * 发送嵌入静态资源（一般是图片）的邮件
     *
     * @param to
     * @param subject
     * @param content 邮件内容，需要包括一个静态资源的id，比如：<img src="cid:rscId01" >
     * @param rscPath 静态资源路径和文件名
     * @param rscId   静态资源id
     */
    public void sendInlineResourceMail(String rscPath, String rscId) {
        MimeMessage message = sender.createMimeMessage();

        try {
            //true表示需要创建一个multipart message
            MimeMessageHelper helper = new MimeMessageHelper(message, true);
            helper.setFrom(from);
            helper.setTo(to);
            helper.setSubject(subject);
            helper.setText(content, true);

            FileSystemResource res = new FileSystemResource(new File(rscPath));
            helper.addInline(rscId, res);

            sender.send(message);
            logger.info("嵌入静态资源的邮件已经发送。");
        } catch (MessagingException e) {
            logger.error("发送嵌入静态资源的邮件时发生异常！", e);
        }
    }
}