关于使用JavaMail发送邮件

 import lombok.extern.slf4j.Slf4j;
 import org.apache.commons.lang3.StringUtils;

 import javax.activation.DataHandler;
 import javax.activation.FileDataSource;
 import javax.mail.Address;
 import javax.mail.Message;
 import javax.mail.Session;
 import javax.mail.Transport;
 import javax.mail.internet.*;
 import java.util.Date;
 import java.util.Properties;

 /**
  * @author <a herf="mailto:yanwu0527@163.com">yanwu</a>
  * @date 2019-10-22 14:17.
  * <p>
  * description: 邮件工具类
  */
 @Slf4j
 public class EmailUtil {
     /*** 发件人地址 */
     private static final String SEND_ADDRESS = "xxxxxxx@qq.com";
     /*** 发件人账户名 */
     private static final String ACCOUNT = "xxxxxxx@qq.com";
     /*** 发件人账户密码[注：此密码不是邮箱登陆密码，而是邮箱授权密码] */
     private static final String PASSWORD = "xxxxxxx";

     private static final String UTF_8 = "UTF-8";
     private static final String CONTENT_TYPE = "text/html;charset=UTF-8";

     /*** 连接邮件服务器的参数配置 */
     private static final Properties PROPERTIES;

     static {
         PROPERTIES = new Properties();
         // ----- 设置用户的认证方式
         PROPERTIES.setProperty("mail.smtp.auth", "true");
         // ----- 设置传输协议
         PROPERTIES.setProperty("mail.transport.protocol", "smtp");
         // ----- 设置发件人的SMTP服务器地址
         PROPERTIES.setProperty("mail.smtp.host", "smtp.qq.com");
     }

     public static void main(String[] args) throws Exception {
         String toRecipient = "xxx@163.com";
         String[] ccRecipient = {"xxx@qq.com", "xxx@qq.com"};
         String subject = "测试邮件";
         String content = "尊敬的用户：xxx@qq.com，您的车票已经抢票成功！信息如下:乘客:xx,日期:xxxx-xx-xx,车次:xxx,地点:杭州xx:xx-合肥xx:xx,席别:硬座。请在30分钟内完成付款！更多信息请查询未付款订单。";
         String[] attachments = {"F:\\compression\\base_menu.sql", "E:\\log\\tcp-client.log"};
         sendEmail(toRecipient, ccRecipient, subject, content, attachments);
     }

     /**
      * 发送邮件[使用默认的发件人信息]
      *
      * @param toRecipient 接收人地址
      * @param ccRecipient 抄送人地址 [为null则不抄送]
      * @param subject     主题
      * @param content     内容
      * @param attachments 附件 [为null则表示无附件]
      * @throws Exception
      */
     public static void sendEmail(String toRecipient, String[] ccRecipient,
                                  String subject, String content, String... attachments) throws Exception {
         sendEmail(SEND_ADDRESS, ACCOUNT, PASSWORD, toRecipient, ccRecipient, subject, content, attachments);
     }

     /**
      * 发送邮件[使用指定的发件人信息]
      *
      * @param sendAddress 发送人地址
      * @param account     发送人账号
      * @param password    发送人密码
      * @param toRecipient 接收人地址
      * @param ccRecipient 抄送人地址 [为null则不抄送]
      * @param subject     主题
      * @param content     内容
      * @param attachments 附件 [为null则表示无附件]
      * @throws Exception
      */
     public static void sendEmail(String sendAddress, String account, String password,
                                  String toRecipient, String[] ccRecipient,
                                  String subject, String content, String... attachments) throws Exception {
         log.info("发送人: [{}], 接收人: [{}], 抄送人: {}, 主题: [{}], 内容: [{}], 附件: {}", sendAddress, toRecipient, ccRecipient, subject, content, attachments);
         // ===== 参数校验
         checkParam(sendAddress, "sender address cannot be empty!");
         checkParam(account, "sender account cannot be empty!");
         checkParam(password, "sender password cannot be empty!");
         checkParam(toRecipient, "recipient address cannot be empty!");
         checkParam(subject, "mail subject cannot be empty!");
         checkParam(content, "mail content cannot be empty!");
         // ===== 创建定义整个应用程序所需的环境信息的 Session 对象
         Session session = Session.getInstance(PROPERTIES);
         // ===== 创建邮件的实例对象
         Message msg = getMimeMessage(session, sendAddress, toRecipient, ccRecipient, subject, content, attachments);
         // ===== 根据session对象获取邮件传输对象Transport
         Transport transport = session.getTransport();
         // ----- 设置发件人的账户名和密码
         transport.connect(account, password);
         // ----- 发送邮件，并发送到所有收件人地址，message.getAllRecipients() 获取到的是在创建邮件对象时添加的所有收件人, 抄送人, 密送人
         transport.sendMessage(msg, msg.getAllRecipients());
         // ===== 关闭邮件连接
         transport.close();
     }

     /**
      * 获得创建一封邮件的实例对象
      *
      * @param session     session
      * @param sendAddress 发送人地址
      * @param toRecipient 接收人地址
      * @param ccRecipient 抄送人地址
      * @param subject     主题
      * @param content     内容
      * @param attachments 附件
      * @return 邮件的实例对象
      * @throws Exception
      */
     private static MimeMessage getMimeMessage(Session session, String sendAddress,
                                               String toRecipient, String[] ccRecipient,
                                               String subject, String content, String... attachments) throws Exception {
         // ----- 创建一封邮件的实例对象
         MimeMessage msg = new MimeMessage(session);
         // ===== 发件人地址
         msg.setFrom(new InternetAddress(sendAddress));
         // ===== 收件人地址
         msg.setRecipients(MimeMessage.RecipientType.TO, toRecipient);
         if (ArrayUtil.isNotEmpty(ccRecipient)) {
             // ----- 抄送人
             Address[] addresses = new InternetAddress[ccRecipient.length];
             for (int i = 0; i < ccRecipient.length; i++) {
                 String cc = ccRecipient[i];
                 checkParam(cc, "Cc address cannot be empty!");
                 addresses[i] = new InternetAddress(cc);
             }
             msg.setRecipients(MimeMessage.RecipientType.CC, addresses);
         }
         // ===== 邮件主题
         msg.setSubject(subject, UTF_8);
         // ===== 邮件处理附件
         if (ArrayUtil.isEmpty(attachments)) {
             // ----- 邮件正文
             msg.setContent(content, CONTENT_TYPE);
         } else {
             // ----- 附件
             MimeMultipart mm = new MimeMultipart();
             // ----- 邮件正文
             MimeBodyPart text = new MimeBodyPart();
             text.setContent(content, CONTENT_TYPE);
             mm.addBodyPart(text);
             // ----- 处理附件
             for (String path : attachments) {
                 if (StringUtils.isBlank(path)) {
                     continue;
                 }
                 // ===== 创建附件节点
                 MimeBodyPart attachment = new MimeBodyPart();
                 // ----- 读取本地文件
                 DataHandler dh = new DataHandler(new FileDataSource(path));
                 // ----- 将附件数据添加到节点
                 attachment.setDataHandler(dh);
                 // ----- 设置附件的文件名（需要编码）
                 attachment.setFileName(MimeUtility.encodeText(dh.getName(), UTF_8, null));
                 mm.addBodyPart(attachment);
             }
             mm.setSubType("mixed");
             msg.setContent(mm);
         }
         // ----- 设置邮件的发送时间,默认立即发送
         msg.setSentDate(new Date());
         return msg;
     }

     /**
      * 参数校验
      *
      * @param str 参数
      * @param msg 异常信息
      */
     private static void checkParam(String str, String msg) {
         if (StringUtils.isBlank(str)) {
             throw new RuntimeException(msg);
         }
     }
 }