Java发送邮件

import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Properties;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.activation.DataHandler;
import javax.mail.Authenticator;
import javax.mail.BodyPart;
import javax.mail.Message;
import javax.mail.MessagingException;
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 javax.mail.internet.MimeUtility;
import javax.mail.util.ByteArrayDataSource;

public class MailUtil {

 String from = ""; // 发件人

 String host = ""; // SMTP地址

 String subject = ""; // 主题

 String body = ""; // 邮件内容

 String user = ""; // 用户名

 String passwd = ""; // 密码

 String fileName = ""; // 附件名

 byte[] fileContent = null;// 附件内容

 private String[] receiverAddress; // 收件人

 public MailUtil(String[] receiverAddress, String from, String smtpServer,
   String subject, String user, String passwd) {
  // 初始化收件人、发件人、主题等
  this.receiverAddress = receiverAddress;
  this.from = from;
  this.host = smtpServer;
  this.subject = subject;
  this.user = user;
  this.passwd = passwd;
 }

 // 该方法用于添加邮件内容
 public void setBody(String mailbody) {
  this.body = mailbody;
 }

 // 该方法用于添加附件
 public void setFile(String fileName, byte[] fileContent) {
  this.fileName = fileName;
  this.fileContent = fileContent;
 }

 public String[] getReceiverAddress() {
  return receiverAddress;
 }

 public void setReceiverAddress(String[] receiverAddress) {
  this.receiverAddress = receiverAddress;
 }

 // 发送信件的方法
 public boolean sendMail() {

  // 创建Properties对象
  Properties props = System.getProperties();

  // 创建信件服务器
  props.put("mail.smtp.host", host);
  props.put("mail.smtp.user", user);
  props.put("mail.smtp.auth", "true");

  // 邮件服务器登录验证
  Authenticator auth = new SMTPAuthenticator(user, passwd);

  // 初始化Session实例
  Session session = Session.getInstance(props, auth);

  try {

   // 创建一个消息，并初始化该消息的各项元素
   MimeMessage msg = new MimeMessage(session);
   msg.setFrom(new InternetAddress(from));

   InternetAddress[] address = null;
   List addressList = new ArrayList();

   // 过滤不合法的收信地址
   for (int i = 0; i < receiverAddress.length; i++) {
    if (receiverAddress[i] != null
      && !receiverAddress[i].equals("")
      && this.isEmail(receiverAddress[i])) {
     addressList.add(receiverAddress[i]);
    }
   }

   if (addressList.size() > 0) {
    address = new InternetAddress[addressList.size()];
    for (int j = 0; j < addressList.size(); j++) {
     address[j] = new InternetAddress((String) addressList
       .get(j));

    }
    // 添加收件人
    msg.setRecipients(Message.RecipientType.TO, address);

    // 添加主题
    msg.setSubject(subject);

    // 加入邮件内容
    BodyPart bp = new MimeBodyPart();
    bp.setContent("" + body, "text/html;charset=GB2312");
    Multipart mp = new MimeMultipart();
    mp.addBodyPart(bp);

    // 添加附件
    if (fileContent != null) {
     setFileByByte(mp, fileContent, fileName);
    }

    // Multipart加入到信件
    msg.setContent(mp);

    // 设置信件头的发送日期
    msg.setSentDate(new Date());

    // 发送信件
    Transport.send(msg);
   }
  } catch (MessagingException mex) {
   mex.printStackTrace();
   Exception ex = null;
   if ((ex = mex.getNextException()) != null) {
    ex.printStackTrace();
   }
   return false;
  } catch (Exception e) {
   e.printStackTrace();
  }
  return true;
 }

 public boolean isEmail(String inputChar) {
  Pattern pattern = Pattern.compile(".+@.+\\..+");
  Matcher matcher = pattern.matcher(inputChar);
  return matcher.matches();
 }

 public void setFileByByte(Multipart mp, byte[] fileInfo, String fileName)
   throws MessagingException, UnsupportedEncodingException {
  MimeBodyPart mbp = new MimeBodyPart();
  DataHandler dh = new DataHandler(new ByteArrayDataSource(fileInfo,
    "application/octet-stream"));
  mbp.setDataHandler(dh);
  mbp.setFileName(MimeUtility.encodeText(fileName, "GBK", "B"));
  mp.addBodyPart(mbp);
 }
}

 

public class SMTPAuthenticator extends javax.mail.Authenticator {

 private String username;

 private String password;

 public SMTPAuthenticator(String username, String password) {
  this.username = username;
  this.password = password;
 }

 public PasswordAuthentication getPasswordAuthentication() {
  return new PasswordAuthentication(username, password);
 }

}