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.