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MapMessageMapMessage 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MultipartMultipart 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MimeMessagemsg.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.