前提：確認匯入了jar包：mail.jar

          *注：網易郵箱給網易郵箱發的較快。

MailUtils.java

package com.pb.utils;

import java.util.Properties;

import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMessage.RecipientType;

public class MailUtils {

	public static void sendMail(String email, String emailMsg)
			throws AddressException, MessagingException {
		// 1.建立一個程式與郵件伺服器會話物件 Session

		Properties props = new Properties();
		props.setProperty("mail.transport.protocol", "SMTP");//傳送協議
		props.setProperty("mail.host", "smtp.163.com");//郵箱伺服器地址
		props.setProperty("mail.smtp.auth", "true");// 指定驗證為true

		// 建立驗證器
		Authenticator auth = new Authenticator() {
			public PasswordAuthentication getPasswordAuthentication() {// ↓ 傳送者的郵箱名和密碼(這裡也可以設定為授權碼，防止郵箱被盜取)
				return new PasswordAuthentication("176****
 
[email protected]", "w****2");
			}
		};

		Session session = Session.getInstance(props, auth);

		// 2.建立一個Message，它相當於是郵件內容
		Message message = new MimeMessage(session);

		message.setFrom(new InternetAddress("176****[email protected]")); // 設定傳送者

		message.setRecipient(RecipientType.TO, new InternetAddress(email)); // 設定傳送方式與接收者

		message.setSubject("使用者啟用");
		// message.setText("這是一封啟用郵件，請<a href='#'>點選</a>");

		message.setContent(emailMsg, "text/html;charset=utf-8");

		// 3.建立 Transport用於將郵件傳送

		Transport.send(message);
	}
}
 

呼叫者：

String emailMsg = "恭喜您註冊成功，請點選下面的連線進行啟用賬戶"
					+ "<a href='http://localhost:9100/shop/active?
activeCode="+activeCode+"'>"
							+ "http://localhost:9100/shop/active?activeCode="+activeCode+"</a>";

				MailUtils.sendMail(user.getEmail(), emailMsg);  從表單獲取的使用者郵箱