JavaMail是一个通过邮件服务器发送和接收邮件的平台独立的框架。
一、简单邮件发送
首先我们需要创建一个Session对象,然后创建一个默认的MimeMessage对象。
import javax.mail.*; import javax.mail.internet.*; import java.util.Properties; public class EmailSender { public void sendEmail(String recipient, String subject, String messageBody) { //定义发送邮件的属性 final String username = "your-email-id"; final String password = "your-password"; Properties props = new Properties(); props.put("mail.smtp.auth", "true"); props.put("mail.smtp.starttls.enable", "true"); props.put("mail.smtp.host", "smtp.gmail.com"); props.put("mail.smtp.port", "587"); //获取Session对象 Session session = Session.getInstance(props, new javax.mail.Authenticator() { protected PasswordAuthentication getPasswordAuthentication() { return new PasswordAuthentication(username, password); } }); try { //创建MimeMessage对象 Message message = new MimeMessage(session); message.setFrom(new InternetAddress("from-email")); message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(recipient)); message.setSubject(subject); message.setText(messageBody); //发送邮件 Transport.send(message); } catch (MessagingException e) { throw new RuntimeException(e); } } }
二、发送含有附件的邮件
如果你想要在邮件中添加附件,则需要创建一个使用Multipart实例的MimeMessage,并添加至少一个BodyPart实例到这个Multipart实例中。
public class EmailSenderWithAttachment { public void sendEmailWithAttachment(String recipient, String subject, String messageBody, String fileName) { //创建和配置Session //...省略相同的部分代码... try { //创建含有附件的邮件 Message message = new MimeMessage(session); message.setFrom(new InternetAddress("from-email")); message.setRecipients(Message.RecipientType.TO,InternetAddress.parse(recipient)); message.setSubject(subject); Multipart multipart = new MimeMultipart(); BodyPart messageBodyPart = new MimeBodyPart(); messageBodyPart.setText(messageBody); multipart.addBodyPart(messageBodyPart); //创建附件部分 messageBodyPart = new MimeBodyPart(); DataSource source = new FileDataSource(fileName); messageBodyPart.setDataHandler(new DataHandler(source)); messageBodyPart.setFileName(fileName); multipart.addBodyPart(messageBodyPart); //设置邮件内容 message.setContent(multipart); //发送邮件 Transport.send(message); } catch (MessagingException e) { throw new RuntimeException(e); } } }
这段代码中添加了一个新的MimeBodyPart对象到Multipart实例中,这个新的对象包含了附件的内容