javamail邮件发送demo code

Properties props = System.getProperties();
props.setProperty("mail.smtp.host", "smtp.qq.com");
props.setProperty("mail.smtp.port", "25");
props.put("mail.smtp.auth", "true");

final String username = "xxx@qq.com";
final String password = "xxx";
Session session = Session.getDefaultInstance(props,
new Authenticator()  {
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(username, password);
}
});

try {
// -- Create a new message --
Message msg = new MimeMessage(session);
// -- Set the FROM and TO fields --
msg.setFrom(new InternetAddress(username));
msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse("xxx@qq.com",false));
msg.setSubject("邮件标题");

MimeMultipart mp=new MimeMultipart();
BodyPart bp = new MimeBodyPart();
String html = "邮件内容<h1>Hello World</h1>";
bp.setContent("<meta http-equiv=Content-Type content=text/html; charset=gb2312>"   + html, "text/html;charset=UTF-8");
mp.addBodyPart(bp);

BodyPart bp1 = new MimeBodyPart();

//附件
FileDataSource fileds = new FileDataSource("C:/people.xml");
bp1.setDataHandler(new DataHandler(fileds));
bp1.setFileName(fileds.getName());
mp.addBodyPart(bp1);

msg.setSentDate(new Date());
msg.setContent(mp);

msg.saveChanges();
Transport.send(msg);
System.out.println("Message sent.");
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}