java tool class SendEmailUtil implements sending mail

This example shares the tool class for sending email with java for your reference, which is as follows

SendEmailUtil

<dependency>
 <groupId>javax.mail</groupId>
 <artifactId>mail</artifactId>
 <version>1.4.5</version>
</dependency>

import javax.mail.Address;
import javax.mail.Message;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import com.sun.mail.util.MailSSLSocketFactory;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Properties;
 
public class SendmailUtil {
 
 //邮件服务器主机名
 // QQ邮箱的 SMTP 服务器地址为: smtp.qq.com
 private static String myEmailSMTPHost = "smtp.qq.com";
 
 //发件人邮箱
 private static String myEmailAccount = "xxxxxxxxxx@xx.com";
 
 //发件人邮箱密码（授权码）
 //在开启SMTP服务时会获取到1个授权码，把授权码填在这里
 private static String myEmailPassword = "xxxxxxxxxxxx";
 
 /**
  * 邮件单发（自由编辑短信，并发送，适用于私信）
  *
  * @param toEmailAddress 收件箱地址
  * @param emailTitle 邮件主题
  * @param emailContent 邮件内容
  * @throws Exception
  */
 public static void sendEmail(String toEmailAddress, String emailTitle, String emailContent) throws Exception{
    
  Properties props = new Properties();
   
  // 开启debug调试
  props.setProperty("mail.debug", "true");
     
  // 发送服务器需要身份验证
  props.setProperty("mail.smtp.auth", "true");
   
  // 端口号
  props.put("mail.smtp.port", 465);
   
  // 设置邮件服务器主机名
  props.setProperty("mail.smtp.host", myEmailSMTPHost);
   
  // 发送邮件协议名称
  props.setProperty("mail.transport.protocol", "smtp");
   
  /**SSL认证，注意腾讯邮箱是基于SSL加密的，所以需要开启才可以使用**/
  MailSSLSocketFactory sf = new MailSSLSocketFactory();
  sf.setTrustAllHosts(true);
   
  //设置是否使用ssl安全连接（1般都使用）
  props.put("mail.smtp.ssl.enable", "true");
  props.put("mail.smtp.ssl.socketFactory", sf);
   
  //创建会话
  Session session = Session.getInstance(props);
   
  //获取邮件对象
  //发送的消息，基于观察者模式进行设计的
  Message msg = new MimeMessage(session);
   
  //设置邮件标题
  msg.setSubject(emailTitle);
   
  //设置邮件内容
  //使用StringBuilder，因为StringBuilder加载速度会比String快，而且线程安全性也不错
  StringBuilder builder = new StringBuilder();
   
  //写入内容
  builder.append("\n" + emailContent);
   
  //写入我的官网
  builder.append("\n官网：" + "https://www.hbuecx.club");
   
  //定义要输出日期字符串的格式
  SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
   
  //在内容后加入邮件发送的时间
  builder.append("\n时间：" + sdf.format(new Date()));
   
  //设置显示的发件时间
  msg.setSentDate(new Date());
   
  //设置邮件内容
  msg.setText(builder.toString());
   
  //设置发件人邮箱
  // InternetAddress 的3个参数分别为: 发件人邮箱, 显示的昵称(只用于显示, 没有特别的要求), 昵称的字符集编码
  msg.setFrom(new InternetAddress(myEmailAccount,"你好！", "UTF-8"));
   
  //得到邮差对象
  Transport transport = session.getTransport();
   
  //连接自己的邮箱账户
  //密码不是自己QQ邮箱的密码，而是在开启SMTP服务时所获取到的授权码
  //connect(host, user, password)
  transport.connect( myEmailSMTPHost, myEmailAccount, myEmailPassword);
   
  //发送邮件
  transport.sendMessage(msg, new Address[] { new InternetAddress(toEmailAddress) });
   
  //将该邮件保存到本地
  OutputStream out = new FileOutputStream("MyEmail.eml");
  msg.writeTo(out);
  out.flush();
  out.close();
 
  transport.close();
 }
}

//toEmailAddress  Target mailbox address 
//emailTitle  Mail Title 
//emailContent  Mail Content  
SendmailUtil.sendEmail(toEmailAddress, emailTitle, emailContent);