带你走进EJB--MDB实现发送邮件(3)

接上篇,在业务逻辑中已经发送JMS消息,而接下来的消息驱动Bean作为JMS消息监听器,主要是负责监听指定的JMS消息,此时已经接受到JMS的消息,那么MDB的onMessage()方法会被触发.调用SimpleMailSender类,发送邮件.

	import javax.ejb.ActivationConfigProperty;
	import javax.ejb.MessageDriven;
	import javax.jms.MapMessage;
	import javax.jms.Message;

	import org.jnqqls.auction.util.SimpleMailSender;

	@MessageDriven(activationConfig = {
			/* 指定MDB所监听消息目的的类型 */
			@ActivationConfigProperty(propertyName = "destinationType", propertyValue = "javax.jms.Queue"),
			@ActivationConfigProperty(propertyName = "acknowledgeMode", propertyValue = "Auto-acknowledge"),
			/* 指定MDB所监听的消息目的的JNDI绑定名 */
			@ActivationConfigProperty(propertyName = "destiniation", propertyValue = "Queue") },
			/* 让MDB的Bean实现类间接地实现MessageListener接口 */
			messageListenerInterface = javax.jms.MessageListener.class,
			/* 指定MDB所监听的消息目的的JNDI绑定名 */
			mappedName = "Queue")
	public class MailMDB {

		//实现onMessage方法——当JMS消息被送达消息目的时，
		//该方法被触发
		public void onMessage(Message rawMsg){
			try {
				if(rawMsg instanceof MapMessage){
					//将消息强制转换为MapMessage
					MapMessage msg=(MapMessage) rawMsg;
					String mailTo=msg.getString("mailTo");
					String userName=msg.getString("userName");
					//准备发送邮件
					SimpleMailSender simpleMailSender = new SimpleMailSender();
					//设置smtp服务器地址
					simpleMailSender.setSmtpServer("smtp.163.com");
					//设置登录的用户名
					simpleMailSender.setUsername("用户名");
					//设置登录密码
					simpleMailSender.setPassword("密码");
					//设置收件人地址
					simpleMailSender.setTo(mailTo);
					//设置发送人地址
					simpleMailSender.setFrom("发件人地址");
					//设置标题
					simpleMailSender.setSubject("注册通知");
					//设置邮件内容
					simpleMailSender.setContent("亲爱的" +userName
							+ ", 您注册网站成功!
							);

					if (simpleMailSender.send()) {
						System.out.println("恭喜邮件发送成功");
					}else{
						System.out.println("邮件发送失败");
					}
				}
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}

以上内容完成了对消息的接受和处理,并且调用JavaMail的相关工具类,这里是指的SimpleMailSender类,完整的将此类写在下面.

	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.Authenticator;
	import javax.mail.Message;
	import javax.mail.MessagingException;
	import javax.mail.Multipart;
	import javax.mail.PasswordAuthentication;
	import javax.mail.Session;
	import javax.mail.Transport;
	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;

	public class SimpleMailSender {

		// 收件人地址。
		private String to;
		// 发件人地址
		private String from;
		// SMTP服务器
		private String smtpServer;
		// 登录服务器用户名.
		private String username;
		// 登录服务器密码
		private String password;
		// 邮件主题
		private String subject;
		// 邮件正文.
		private String content;

		// 记录附件集合.
		List<String> attachments = new ArrayList<>();

		public String getTo() {
			return to;
		}

		public void setTo(String to) {
			this.to = to;
		}

		public String getFrom() {
			return from;
		}

		public void setFrom(String from) {
			this.from = from;
		}

		public String getSmtpServer() {
			return smtpServer;
		}

		public void setSmtpServer(String smtpServer) {
			this.smtpServer = smtpServer;
		}

		public String getUsername() {
			return username;
		}

		public void setUsername(String username) {
			this.username = username;
		}

		public String getPassword() {
			return password;
		}

		public void setPassword(String password) {
			this.password = password;
		}

		public String getSubject() {
			return subject;
		}

		public void setSubject(String subject) {
			this.subject = subject;
		}

		public String getContent() {
			return content;
		}

		public void setContent(String content) {
			this.content = content;
		}

		public List<String> getAttachments() {
			return attachments;
		}

		public void setAttachments(List<String> attachments) {
			this.attachments = attachments;
		}

		// 无参数的构造器.
		public SimpleMailSender() {

		}

		public SimpleMailSender(String to, String from, String smtpServer, String username,
				String password, String subject, String content) {
			super();
			this.to = to;
			this.from = from;
			this.smtpServer = smtpServer;
			this.username = username;
			this.password = password;
			this.subject = subject;
			this.content = content;
		}

		/**
		 * 把邮件主题转换为中文
		 *
		 * @param strText
		 * @return
		 */
		public String transferChinese(String strText) {
			try {
				strText = MimeUtility.encodeText(new String(strText.getBytes(),
						"GB2312"), "GB2312", "B");
			} catch (Exception e) {
				e.printStackTrace();
			}
			return strText;
		}

		/**
		 * 增加附件,将附件文件名添加到List集合中.
		 *
		 * @param name
		 */
		public void attachfile(String name) {
			attachments.add(name);
		}

		/**
		 * 发送邮件
		 * @return
		 */
		/**
		 * @return
		 */
		public boolean send(){
			//创建邮件Session所需要的Properties对象
			Properties props = new Properties();
			props.put("mail.smtp.host", smtpServer);
			props.put("mail.smtp.auth", "true");

			//创建Session对象
			Session session= Session.getDefaultInstance(props
					//以匿名内部类的形式创建登录服务器的认证对象.
					,new Authenticator() {
						public PasswordAuthentication getPasswordAuthentication(){
							return new PasswordAuthentication(username, password);
						}
					});

			try {
				//构造MimeMessage并设置相关属性.
				MimeMessage msg = new MimeMessage(session);
				//设置发件人
				msg.setFrom(new InternetAddress(from));
				//设置收件人
				InternetAddress[] addresses={new InternetAddress(to)};
				msg.setRecipients(Message.RecipientType.TO, addresses);
				//设置邮件主题
				subject = transferChinese(subject);
				msg.setSubject(subject);
				//构造Multipart
				Multipart mp = new MimeMultipart();
				//向 Multipart中 添加正文
				MimeBodyPart mbpContext = new MimeBodyPart();
				mbpContext.setText(content);
				//将BodyPart添加到Multipart容器中.
				mp.addBodyPart(mbpContext);
				//向Multipart添加附件.
				//遍历附件列表,将所有的文件添加到邮件消息里
				for (String efile  : attachments) {
					MimeBodyPart mbpFile = new MimeBodyPart();
					//通过文件名创建FileDataSource对象.
					FileDataSource fds = new FileDataSource(efile);
					//处理附件
					mbpFile.setDataHandler(new DataHandler(fds));
					mbpFile.setFileName(fds.getName());
					//将bodypart添加到Multipart容器中.
					mp.addBodyPart(mbpFile);
				}
				//清空附件列表
				attachments.clear();
				//向Multipart添加MimeMessage
				msg.setContent(mp);
				//设置发送日期
				msg.setSentDate(new Date());
				//发送邮件
				Transport.send(msg);

			} catch (MessagingException mex) {
				mex.printStackTrace();
				return false;

			}
			return true;
		}

	}

通过以上的四个步骤,我们基本上完成了用JavaMail来发送邮件通知的业务需求,当然,读者也可以根据JavaMail的相关API来实现接收邮件.这样就类似一个迷你的邮箱系统了.