Java发送邮件

• 所需资源
  1. JavaMail API jar包
  2. mail.properties
     文件：
     

import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Date;
import java.util.Properties;

import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.Message.RecipientType;
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;

public class MailUtils {
	private static Session session = null;

	private static String myEmailAccount;
	private static String myEmailPassword;
	private static String myEmailSMTPHost;

	private MailUtils(){
		
	}
	
	private static Session getSession() throws IOException {
		if (session == null) {
			// 读取配置信息
			Properties prop = new Properties();
			InputStream ins = new BufferedInputStream(new FileInputStream("src/mail.properties"));
			// InputStream ins =
			// this.getClass().getResourceAsStream("/mail.properties");
			prop.load(ins);
			myEmailAccount = prop.getProperty("myEmailAccount");
			myEmailPassword = prop.getProperty("myEmailPassword");
			myEmailSMTPHost = prop.getProperty("myEmailSMTPHost");

			// 1.创建连接对象，连接到邮件服务器
			Properties props = new Properties();
			// props.setProperty("host", value);
			props.setProperty("mail.transport.protocol", "smtp");
			props.setProperty("mail.smtp.host", myEmailSMTPHost);
			props.setProperty("mail.smtp.auth", "true");

			session = Session.getInstance(props, new Authenticator() {
				@Override
				protected PasswordAuthentication getPasswordAuthentication() {
					// 发送帐号
					return new PasswordAuthentication(myEmailAccount, myEmailPassword);
				}
			});
		}
		return session;
	}

	/**
	 * 根据配置文件发送邮件的方法
	 * 
	 * @param toAddress
	 *            :收件人地址
	 * @param code
	 *            :激活码
	 * @throws IOException
	 * @throws MessagingException
	 * @throws AddressException
	 * @throws Exception
	 */
	public static void sendMailByNet2(String toAddress, String subject, String content)
			throws IOException, AddressException, MessagingException {
		Session session = getSession();
		session.setDebug(true);

		// 2.创建邮件对象
		Message message = new MimeMessage(session);

		// 2.1设置发件人
		message.setFrom(new InternetAddress(myEmailAccount));
		// 2.2设置收件人
		message.setRecipient(RecipientType.TO, new InternetAddress(toAddress));
		// 2.3设置邮件主题
		message.setSubject(subject);
		// 2.4设置邮件的正文
		message.setContent(content, "text/html;charset=UTF-8");
		message.setSentDate(new Date());
		message.saveChanges();

		// 3.发送激活邮件
		 Transport.send(message);

		/*Transport transport = session.getTransport();
		transport.connect(myEmailAccount, myEmailPassword);
		transport.sendMessage(message, message.getAllRecipients());
		transport.close();
*/
	}

	public static void main(String[] args) {
		long startTime = System.currentTimeMillis();

		try {
			sendMailByNet2("bigzxxxx@qq.com", "测试邮件1", "Hello");
		} catch (AddressException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} catch (MessagingException e) {
			e.printStackTrace();
		}
		long endTime = System.currentTimeMillis();

		System.out.println(endTime - startTime + "ms");
	}
}

#mail.properties
mail.transport.protocol=smtp
myEmailSMTPHost=smtp.163.com
myEmailAccount=xxxx@163.com
myEmailPassword=xxx
#password可能不是网页邮箱的登录密码，注意查看，一般QQ需要设置第三方的授权登录密码，此处填写第三方的授权登录密码