1.项目结构图：
2.pom.xml：
3.EmailManager.java：
public class EmailManager { public static String username = "test@qq.com"; // 服务邮箱，发送方邮箱 public static String password = "abcdef"; // 邮箱授权码，需要设置 public static String senderNick = "飘逸的画笔~~"; // 发件人昵称 private Properties props; // 系统属性 private Session session; // 邮件会话对象 private MimeMessage mimeMsg; // MIME邮件对象 private Multipart mp; // Multipart对象,邮件内容,标题,附件等内容均添加到其中后再生成MimeMessage对象 private static EmailManager instance = null; public EmailManager() { props = System.getProperties(); props.put("mail.smtp.auth", "true"); props.put("mail.transport.protocol", "smtp"); props.put("mail.smtp.host", "smtp.qq.com"); props.put("mail.smtp.port", "465"); props.put("mail.smtp.timeout", "60000"); props.put("mail.smtp.socketFactory.port", "465"); props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory"); props.put("username", username); props.put("password", password); // 建立会话 session = Session.getDefaultInstance(props); session.setDebug(false); } public static EmailManager getInstance() { if (instance == null) { instance = new EmailManager(); } return instance; } public boolean sendMail(String from, String[] to, String[] copyto, String subject, String content, String[] fileList) { boolean success = true; try { mimeMsg = new MimeMessage(session); mp = new MimeMultipart(); // 自定义发件人昵称 String nick = ""; try { nick = javax.mail.internet.MimeUtility.encodeText(senderNick); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } // 设置发件人 mimeMsg.setFrom(new InternetAddress(from, nick)); // 设置收件人 if (to != null && to.length > 0) { String toListStr = getMailList(to); mimeMsg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(toListStr)); } // 设置抄送人 if (copyto != null && copyto.length > 0) { String ccListStr = getMailList(copyto); mimeMsg.setRecipients(Message.RecipientType.CC, InternetAddress.parse(ccListStr)); } // 设置主题 mimeMsg.setSubject(subject); // 设置正文 BodyPart bp = new MimeBodyPart(); bp.setContent(content, "text/html;charset=utf-8"); mp.addBodyPart(bp); // 设置附件 if (fileList != null && fileList.length > 0) { for (int i = 0; i < fileList.length; i++) { bp = new MimeBodyPart(); FileDataSource fds = new FileDataSource(fileList[i]); bp.setDataHandler(new DataHandler(fds)); bp.setFileName(MimeUtility.encodeText(fds.getName(), "UTF-8", "B")); mp.addBodyPart(bp); } } mimeMsg.setContent(mp); mimeMsg.saveChanges(); // 发送邮件 if (props.get("mail.smtp.auth").equals("true")) { Transport transport = session.getTransport("smtp"); transport.connect((String)props.get("mail.smtp.host"), (String)props.get("username"), (String)props.get("password")); transport.sendMessage(mimeMsg, mimeMsg.getAllRecipients()); transport.close(); } else { Transport.send(mimeMsg); } System.out.println("邮件发送成功"); } catch (MessagingException e) { e.printStackTrace(); success = false; } catch (UnsupportedEncodingException e) { e.printStackTrace(); success = false; } return success; } public String getMailList(String[] mailArray) { StringBuffer toList = new StringBuffer(); int length = mailArray.length; if (mailArray != null && length < 2) { toList.append(mailArray[0]); } else { for (int i = 0; i < length; i++) { toList.append(mailArray[i]); if (i != (length - 1)) { toList.append(","); } } } return toList.toString(); } public static void main(String[] args) { String from = username; String[] to = {"lisi@qq.com","wangwu@163.com"}; String[] copyto = {"zhaoliu@163.com"}; String subject = "测试一下"; String content = "这是邮件内容，仅仅是测试，不需要回复."; String[] fileList = new String[3]; fileList[0] = "E:/1.jpg"; fileList[1] = "E:/1.txt"; fileList[2] = "E:/2.txt"; EmailManager.getInstance().sendMail(from, to, copyto, subject, content, fileList); }}