實現郵件發送

把需要的參數填寫進去就可了，發送的HTML格式的內容 

郵件實體類

import lombok.Data;


@Data
public class MailInfo {
    public static final String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory";

    // SMTP服務器地址
    private String smtpServer;
    private String port; // 端口
    private String fromUserName;
    private String fromUserPassword;//密碼/授權碼
    // 登錄SMTP服務器的密碼
    private String toUser;   // 收件人
    private String subject; // 郵件主題
    private String content; // 郵件正文

    public MailInfo() {

    }
    public MailInfo(String toUser, String content) {
        this.toUser = toUser;
        this.content = content;
    }
}

package com.x.bmp.policy.utils.mail;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.stereotype.Component;

import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import java.util.Date;
import java.util.Properties;
@RefreshScope
@Component
public class MailSender {
    // SMTP服務器地址
    @Value("${policy.renew.mail.smtpServer}")
    private String smtpServer;
    @Value("${policy.renew.mail.port}")
    private String port; // 端口
    @Value("${policy.renew.mail.fromUserName}")
    private String fromUserName;
    @Value("${policy.renew.mail.fromUserPassword}")
    private String fromUserPassword;
    @Value("${policy.renew.mail.subject}")
    private String subject; // 郵件主題

    public void sendMailText(MailInfo mailInfo) throws Exception {
        mailInfo.setSmtpServer(smtpServer);
        mailInfo.setPort(port);
        mailInfo.setFromUserName(fromUserName);
        mailInfo.setFromUserPassword(fromUserPassword);
        mailInfo.setSubject(subject);
        //1、連接郵件服務器的參數配置
        Properties props = new Properties();
        //設置用戶的認證方式
        props.setProperty("mail.smtp.auth", "true");
        //設置傳輸協議
        props.setProperty("mail.transport.protocol", "smtp");
        //設置發件人的SMTP服務器地址
        props.setProperty("mail.smtp.host", mailInfo.getSmtpServer());
//        MailSSLSocketFactory sf = new MailSSLSocketFactory();
//        sf.setTrustAllHosts(true);
        props.put("mail.smtp.ssl.enable", "true");
        props.put("mail.smtp.ssl.socketFactory",MailInfo.SSL_FACTORY);
        props.put("mail.smtp.socketFactory.fallback","false");
        props.put("mail.smtp.socketFactory.port",mailInfo.getPort());
        //2、創建定義整個應用程序所需的環境信息的 Session 對象
        Session session = Session.getInstance(props);
        //設置調試信息在控制檯打印出來
        session.setDebug(true);
        //3、創建郵件的實例對象
        Message msg = getMimeMessage(session,mailInfo);
        //4、根據session對象獲取郵件傳輸對象Transport
        Transport transport = session.getTransport("smtp");
        //設置發件人的賬戶名和密碼
        transport.connect(mailInfo.getSmtpServer(),mailInfo.getFromUserName(), mailInfo.getFromUserPassword());
        //發送郵件，併發送到所有收件人地址，message.getAllRecipients() 獲取到的是在創建郵件對象時添加的所有收件人, 抄送人, 密送人
        transport.sendMessage(msg,msg.getAllRecipients());

        //如果只想發送給指定的人，可以如下寫法
        //transport.sendMessage(msg, new Address[]{new InternetAddress("[email protected]")});

        //5、關閉郵件連接
        transport.close();
    }


    /**
     * 獲得創建一封郵件的實例對象
     * @param session
     * @return MimeMessage
     */
    public static MimeMessage getMimeMessage(Session session,MailInfo mailInfo) throws Exception{
        // String content,String senderAddress,String recipientAddress

        //創建一封郵件的實例對象
        MimeMessage msg = new MimeMessage(session);
        //設置發件人地址
        msg.setFrom(new InternetAddress(mailInfo.getFromUserName()));
        /**
         * 設置收件人地址（可以增加多個收件人、抄送、密送），即下面這一行代碼書寫多行
         * MimeMessage.RecipientType.TO:發送
         * MimeMessage.RecipientType.CC：抄送
         * MimeMessage.RecipientType.BCC：密送
         */
        msg.setRecipient(MimeMessage.RecipientType.TO,new InternetAddress(mailInfo.getToUser()));

        Multipart multipart = new MimeMultipart();
        // 創建一個包含HTML內容的MimeBodyPart
        BodyPart html = new MimeBodyPart();
        //設置郵件主題
        msg.setSubject(mailInfo.getSubject(),"UTF-8");
        //設置郵件正文
        html.setContent(mailInfo.getContent(), "text/html;charset=UTF-8");
        multipart.addBodyPart(html);
        msg.setContent(multipart);
        //設置郵件的發送時間,默認立即發送
        msg.setSentDate(new Date());
        msg.saveChanges();
        return msg;
    }

//    public static void main(String [] args){
//      MailSender mailSender = new MailSender();
//        try {
//            mailSender.sendMailText("你好啊，這個是一個簡單的純文本郵件！");
//        } catch (Exception e) {
//            e.printStackTrace();
//        }
//    }
}