javamail 发送邮件

import java.util.Enumeration;
import java.util.Properties;
import java.util.Vector;
import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.Multipart;
import javax.mail.PasswordAuthentication;
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 java.io.FileReader;
import java.io.FileInputStream;
import java.io.IOException;
import javax.activation.DataHandler;
import javax.activation.FileDataSource;

public class MailTest {

  //邮件体
  Multipart mp = new MimeMultipart();

  //定义字符串
  //邮件服务器地址
  String mailserver = "";
  //用户名
  String user = "";
  //密码
  String password = "";
  //主题
  String subject = "";
  //发件人地址
  String fromAddr = "";
  //收件人地址
  String toAddr = "";
  //邮件正文引入文件路径
  String msgfilepath = "";
  //抄送人地址
  String ccAddr = "";
  //密送人地址
  String bccAddr = "";
  //附件路径
  String withfilepath = "";

  public MailTest() {
  }

  public static void main(String[] args) throws IOException {
    //发送邮件
    new MailTest().sendMail();
  }

  /**
   * 获取文本文件内容
   * @param path String
   * @throws IOException
   * @return String
   */
  public String getFile(String path) throws IOException {
    //读取文件内容
    char[] chrBuffer = new char[10];//缓冲十个字符
    int intLength;
    String s = "";//文件内容字符串
    FileReader fis = new FileReader(path);
    while ( (intLength = fis.read(chrBuffer)) != -1) {
      String temp = String.valueOf(chrBuffer);//转换字符串
      s = s + temp;//累加字符串
    }
    return s;
  }

  public void sendMail() throws IOException {
    //读取配置文件
    Properties setupfile = new Properties();
    FileInputStream fis = new FileInputStream("setup.properites");
    setupfile.load(fis);
    mailserver = setupfile.getProperty("mailserver");
    user = setupfile.getProperty("user");
    password = setupfile.getProperty("password");
    subject = setupfile.getProperty("subject");
    fromAddr = setupfile.getProperty("fromAddr");
    toAddr = setupfile.getProperty("toAddr");
    ccAddr = setupfile.getProperty("ccAddr");
    bccAddr = setupfile.getProperty("bccAddr");
    withfilepath = setupfile.getProperty("withfilepath");
    //信件内容文件路径
    msgfilepath = setupfile.getProperty("msgfilepath");
    //获取信件内容
    String message = getFile(msgfilepath);

    try {
      Properties props = new Properties();
      props.put("mail.smtp.host", mailserver); //例如：202.108.44.206 smtp.163.com
      props.put("mail.smtp.auth", "true"); //认证是否设置

      //建立会话并且认证
      Session session = Session.getDefaultInstance(props,
          new Authenticator() {
        public PasswordAuthentication getPasswordAuthentication() {
          return new PasswordAuthentication(user, password);
        }
      }
      );
      Message msg = new MimeMessage(session);
//发送源地址
      msg.setFrom(new InternetAddress(fromAddr));
//发送目的地址
      InternetAddress[] tos = InternetAddress.parse(toAddr);
      msg.setRecipients(Message.RecipientType.TO, tos);
//抄送目的地址
      InternetAddress[] toscc = InternetAddress.parse(ccAddr);
      msg.setRecipients(Message.RecipientType.CC, toscc);

//密送目的地址
      InternetAddress[] tosbcc = InternetAddress.parse(bccAddr);
      msg.setRecipients(Message.RecipientType.BCC, tosbcc);

//主题
      msg.setSubject(subject);

//邮件内容
      //msg.setText(message);//发送不带附件时用，简单信件。
      //把信件内容放入mp内，和附件一样的放发，作为一个整体发送。
      MimeBodyPart mbps = new MimeBodyPart();
      mbps.setText(message);
      mp.addBodyPart(mbps);

//附件
      Vector file = new Vector();
      file.addElement(withfilepath);
      //附件名集合枚举
      Enumeration efile = file.elements();
      while (efile.hasMoreElements()) {
        MimeBodyPart mbp = new MimeBodyPart();
        //选择出每一个附件名
        String filename = efile.nextElement().toString();
        //得到数据源
        FileDataSource fds = new FileDataSource(filename);
        //得到附件本身并至入BodyPart
        mbp.setDataHandler(new DataHandler(fds));
        //得到文件名同样至入BodyPart
        mbp.setFileName(fds.getName());
        mp.addBodyPart(mbp);
      }
      //移走集合中的所有元素
      file.removeAllElements();
      //Multipart加入到信件
      msg.setContent(mp);

//发送
      Transport.send(msg);
      System.out.println("Mail is Sent");
    }
    catch (Exception e) {
      System.out.println(e);
    }

  }
}