javaMail自动发邮件，可以带附件

import javax.mail.*; 
import javax.mail.internet.*; 
import java.util.*; 
import javax.activation.*; 
 
public class Mail { 
 
    public static void main(String[] args) { 
 
        Properties props = System.getProperties(); 
        // 设置smtp服务器 
        props.setProperty("mail.smtp.host", "smtp.163.com"); 
        // 现在的大部分smpt都需要验证了 
        props.put("mail.smtp.auth", "true"); 
 
        Session s = Session.getInstance(props); 
        // 为了查看运行时的信息 
        s.setDebug(true); 
        // 由邮件会话新建一个消息对象 
        MimeMessage message = new MimeMessage(s); 
        try { 
            // 发件人 
            InternetAddress from = new InternetAddress(" [e-mail]"); 
            message.setFrom(from); 
            // 收件人 
            InternetAddress to = new InternetAddress(" [e-mail]"); 
            message.setRecipient(Message.RecipientType.TO, to); 
            // 邮件标题 
            message.setSubject("test"); 
            String content = "测试内容"; 
            // 邮件内容,也可以使纯文本"text/plain" 
            message.setContent(content, "text/html;charset=GBK"); 
 
            /****下面代码是发送附件******
            String fileName = "d://hello.txt";
            MimeBodyPart messageBodyPart = new MimeBodyPart();
            messageBodyPart.setText("Hi");
            Multipart multipart = new MimeMultipart();
            multipart.addBodyPart(messageBodyPart);
 
            messageBodyPart = new MimeBodyPart();
            DataSource source = new FileDataSource(fileName);
            messageBodyPart.setDataHandler(new DataHandler(source));
            messageBodyPart.setFileName(fileName);
            multipart.addBodyPart(messageBodyPart);
 
            message.setContent(multipart);*/ 
             
            message.saveChanges(); 
            Transport transport = s.getTransport("smtp"); 
            // smtp验证，就是你用来发邮件的邮箱用户名密码 
            transport.connect("smtp.163.com", "test", "pwd"); 
            // 发送 
            transport.sendMessage(message, message.getAllRecipients()); 
            transport.close(); 
 
        } catch (Exception e) { 
            e.printStackTrace(); 
        } 
 
    } 
 
}