import java.util.Date;
import java.util.Properties;
import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.Message.RecipientType;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
public class MailDemo {
public static void main(String args[]) throws Exception {
Properties props = new Properties();
props.setProperty("mail.smtp.auth", "true");
props.setProperty("mail.transport.protocol", "smtp");
props.setProperty("mail.host", "smtp.sina.com");
props.setProperty("mail.port", "25");

Session session = Session.getInstance(props, new Authenticator() {
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication("test", "123456");
}
});
session.setDebug(true);
Message msg = new MimeMessage(session);
msg.setFrom(new InternetAddress("test@sina.com"));
msg.setSubject("你好吗？");
msg.setSentDate(new Date());
msg.setContent("我很好，你呢？", "text/html;charset=gbk");
msg.setRecipients(RecipientType.TO, InternetAddress.parse("test@sina.com,test@sohu.com"));
Transport.send(msg);
}
}