Java实现邮件发送【带附件】

package com.mailSend;

/**
* @author pc-zw
* @describe
* @date 2016/8/11
*/

import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.*;
import javax.mail.internet.*;
import java.io.IOException;
import java.io.InputStream;
import java.util.Date;
import java.util.Enumeration;
import java.util.Properties;
import java.util.Vector;

public class SendMailHasAttachUtil {

private MimeMessage message;
private Session session;
private Transport transport;
private String mailHost="";
private int mailPort;
private String sender_username="";
private String sender_password="";
private String smtp_auth = "";
private Vector file;

private Properties properties = new Properties();
/*
* 初始化方法
*/
public SendMailHasAttachUtil(boolean debug) {
InputStream in = SendMailHasAttachUtil.class.getClassLoader().getResourceAsStream("config.properties");
try {
properties.load(in);
this.mailHost = properties.getProperty("mail.smtp.host");
this.mailPort = Integer.parseInt(properties.getProperty("mail.smtp.port"));
this.sender_username = properties.getProperty("mail.sender.username");
this.sender_password = properties.getProperty("mail.sender.password");
this.smtp_auth = properties.getProperty("mail.smtp.auth");
} catch (IOException e) {
e.printStackTrace();
}
Authenticator auth = new MyAuthenticator(sender_username, sender_password);
session = Session.getDefaultInstance(properties, auth);
session.setDebug(debug);//开启后有调试信息
message = new MimeMessage(session);
}

/**
* 发送邮件
*
* @param subject
*            邮件主题
* @param sendHtml
*            邮件内容
* @param receiveUser
*            收件人地址
*/
public void doSendHtmlEmail(String subject, String sendHtml,String fileName,
String receiveUser) {
try {
// 发件人
//InternetAddress from = new InternetAddress(sender_username);
// 下面这个是设置发送人的Nick name
InternetAddress from = new InternetAddress(MimeUtility.encodeWord("sky")+" <"+sender_username+">");
message.setFrom(from);
// 收件人
InternetAddress to = new InternetAddress(receiveUser);
message.setRecipient(Message.RecipientType.TO, to);//还可以有CC、BCC
// 抄送人
message.setRecipient(Message.RecipientType.CC, new InternetAddress("zhangwu@100.com"));
// 暗送人
message.setRecipient(Message.RecipientType.BCC, new InternetAddress("zhangwu@yy.com"));
// 邮件主题
message.setSubject(subject);
String content = sendHtml.toString();
// 邮件内容,也可以使纯文本"text/plain"
message.setContent(content, "text/html;charset=UTF-8");
file = new Vector();
file.addElement(fileName);
Multipart mp = new MimeMultipart();
MimeBodyPart mbp = new MimeBodyPart();
mbp.setContent(content.toString(), "text/html;charset=gb2312");
mp.addBodyPart(mbp);
if(!file.isEmpty()){//有附件
Enumeration efile=file.elements();
while(efile.hasMoreElements()){
mbp=new MimeBodyPart();
fileName=efile.nextElement().toString(); //选择出每一个附件名
FileDataSource fds=new FileDataSource(fileName); //得到数据源
mbp.setDataHandler(new DataHandler(fds)); //得到附件本身并至入BodyPart
mbp.setFileName(fds.getName());  //得到文件名同样至入BodyPart
mp.addBodyPart(mbp);
}
file.removeAllElements();
}
message.setContent(mp); //Multipart加入到信件
message.setSentDate(new Date());     //设置信件头的发送日期
// 保存邮件
message.saveChanges();

transport = session.getTransport("smtp");
// smtp验证，就是你用来发邮件的邮箱用户名密码
transport.connect(mailHost,mailPort, sender_username, sender_password);
// 发送
transport.sendMessage(message, message.getAllRecipients());
//System.out.println("send success!");
} catch (Exception e) {
e.printStackTrace();
}finally {
if(transport!=null){
try {
transport.close();
} catch (MessagingException e) {
e.printStackTrace();
}
}
}
}

public static void main(String[] args) {
SendMailHasAttachUtil se = new SendMailHasAttachUtil(false);
se.doSendHtmlEmail("邮件主题", "我错了","D:\\hello.txt", "xx@qq.com");
}
}