java 实现邮件发送

import java.util.Properties;

import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.FileDataSource;
import javax.mail.BodyPart;
import javax.mail.Message;
import javax.mail.Message.RecipientType;
import javax.mail.Multipart;
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 sun.misc.BASE64Encoder;

public class AnnexMailService {
    private String host = "";
    private String from = "";
    private String to = "";
    private String affix = "";
    private String affixName = "";
    private String user = "";
    private String pwd = "";
    private String subject = "";

    public void setAddress(String from, String to, String subject) {
        this.from = from;
        this.to = to;
        this.subject = subject;
    }

    public void setAffix(String affix, String affixName) {
        this.affix = affix;
        this.affixName = affixName;
    }

    public void send(String host, String user, String pwd) {
        this.host = host;
        this.user = user;
        this.pwd = pwd;

        Properties props = new Properties();

        props.put("mail.smtp.host", host);

        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.port", Integer.valueOf(465));
        props.put("mail.smtp.ssl.enable", Boolean.valueOf(true));

        Session session = Session.getDefaultInstance(props);

        session.setDebug(true);

        MimeMessage message = new MimeMessage(session);
        try {
            message.setFrom(new InternetAddress(this.from));

            message.addRecipient(Message.RecipientType.TO, new InternetAddress(
                    this.to));

            message.setSubject(this.subject);

            Multipart multipart = new MimeMultipart();

            BodyPart contentPart = new MimeBodyPart();
            contentPart.setText("第二种方法···");
            multipart.addBodyPart(contentPart);

            BodyPart messageBodyPart = new MimeBodyPart();
            DataSource source = new FileDataSource(this.affix);

            messageBodyPart.setDataHandler(new DataHandler(source));

            BASE64Encoder enc = new BASE64Encoder();
            messageBodyPart.setFileName("=?GBK?B?"
                    + enc.encode(this.affixName.getBytes()) + "?=");
            multipart.addBodyPart(messageBodyPart);

            message.setContent(multipart);

            message.saveChanges();

            Transport transport = session.getTransport("smtp");

            transport.connect(host, user, pwd);

            transport.sendMessage(message, message.getAllRecipients());
            transport.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        
        AnnexMailService cn = new AnnexMailService();
        // 设置发件人地址、收件人地址和邮件标题
        cn.setAddress("xxx@163.com", "xxxx@qq.com", "text测试");
        // 设置要发送附件的位置和标题
        cn.setAffix("D:\\adcfg.json", "abcfg.json");
        // 设置smtp服务器以及邮箱的帐号和密码
        cn.send("smtp.163.com", "xxx@163.com", "****");
    }
}