构建后应该引用了两个JAR：。如果第二个JAR没有的话，大家可以去Maven库找一下，就不多讲述了。
实现的源码如下，一般直接拿来就可以用了~
import java.io.UnsupportedEncodingException; import java.util.ArrayList; import java.util.Date; import java.util.List; import java.util.Properties; import javax.activation.DataHandler; import javax.activation.FileDataSource; import javax.mail.Message; import javax.mail.MessagingException; import javax.mail.Multipart; import javax.mail.Session; import javax.mail.Transport; import javax.mail.internet.AddressException; import javax.mail.internet.InternetAddress; import javax.mail.internet.MimeBodyPart; import javax.mail.internet.MimeMessage; import javax.mail.internet.MimeMultipart; import javax.mail.internet.MimeUtility; /** * Java Mail 工具类 * * @author XueQi * @version 1.0 * */ public class MailUtils { private static String host; private static String username; private static String password; private static String from; private static String nick; static { try { // Test Data host = "smtp.163.com"; username = "邮箱用户名"; password = "邮箱密码"; from = "xxx@abc.com"; nick = "测试admin"; // nick + from 组成邮箱的发件人信息 } catch (Exception e) { e.printStackTrace(); } } /** * 发送邮件 * * @param to * 收件人列表，以","分割 * @param subject * 标题 * @param body * 内容 * @param filepath * 附件列表,无附件传递null * @return * @throws MessagingException * @throws AddressException * @throws UnsupportedEncodingException */ public static boolean sendMail(String to, String subject, String body, List<String> filepath) throws AddressException, MessagingException, UnsupportedEncodingException { // 参数修饰 if (body == null) { body = ""; } if (subject == null) { subject = "无主题"; } // 创建Properties对象 Properties props = System.getProperties(); // 创建信件服务器 props.put("mail.smtp.host", host); props.put("mail.smtp.auth", "true"); // 通过验证 // 得到默认的对话对象 Session session = Session.getDefaultInstance(props, null); // 创建一个消息，并初始化该消息的各项元素 MimeMessage msg = new MimeMessage(session); nick = MimeUtility.encodeText(nick); msg.setFrom(new InternetAddress(nick + "<" + from + ">")); // 创建收件人列表 if (to != null && to.trim().length() > 0) { String[] arr = to.split(","); int receiverCount = arr.length; if (receiverCount > 0) { InternetAddress[] address = new InternetAddress[receiverCount]; for (int i = 0; i < receiverCount; i++) { address[i] = new InternetAddress(arr[i]); } msg.addRecipients(Message.RecipientType.TO, address); msg.setSubject(subject); // 后面的BodyPart将加入到此处创建的Multipart中 Multipart mp = new MimeMultipart(); // 附件操作 if (filepath != null && filepath.size() > 0) { for (String filename : filepath) { MimeBodyPart mbp = new MimeBodyPart(); // 得到数据源 FileDataSource fds = new FileDataSource(filename); // 得到附件本身并至入BodyPart mbp.setDataHandler(new DataHandler(fds)); // 得到文件名同样至入BodyPart mbp.setFileName(fds.getName()); mp.addBodyPart(mbp); } MimeBodyPart mbp = new MimeBodyPart(); mbp.setText(body); mp.addBodyPart(mbp); // 移走集合中的所有元素 filepath.clear(); // Multipart加入到信件 msg.setContent(mp); } else { // 设置邮件正文 msg.setText(body); } // 设置信件头的发送日期 msg.setSentDate(new Date()); msg.saveChanges(); // 发送信件 Transport transport = session.getTransport("smtp"); transport.connect(host, username, password); transport.sendMessage(msg, msg.getRecipients(Message.RecipientType.TO)); transport.close(); return true; } else { System.out.println("None receiver!"); return false; } } else { System.out.println("None receiver!"); return false; } } public static void main(String[] args) throws AddressException, UnsupportedEncodingException, MessagingException { List<String> filepath = new ArrayList<>(); filepath.add("E:\\Resources\\Development Test\\AuctionServer\\src\\main\\java\\com\\auction\\dao\\IBaseDAO.java"); filepath.add("E:\\Resources\\Development Test\\AuctionServer\\src\\main\\java\\com\\auction\\dao\\IMemcacheDAO.java"); sendMail("000000@qq.com,000002@live.cn", "注册信息邮件", "注册邮件，有附件", filepath); } }