代码如下:

package com.weimob.finance.utils;

import java.io.UnsupportedEncodingException;

import java.util.Date;

import java.util.List;

import java.util.Properties;

import javax.activation.DataHandler;

import javax.activation.FileDataSource;

import javax.mail.Message;

import javax.mail.MessagingException;

import javax.mail.Multipart;

import javax.mail.Session;

import javax.mail.Transport;

import javax.mail.internet.AddressException;

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;

/**

 * Java Mail 工具类

 *  

 * @author XueQi

 * @version 1.0

 *  

 */  

public class MailUtils {  

    private static String host;  

    private static String username;  

    private static String password;  

    private static String from;  

    private static String nick;  

 

    static {  

        try {  

            // Test Data  

            host = "smtp.qq.com";  

            username = "yourqq@qq.com";  

            password = "*******";  

            from = "yourqq@qq.com";  

            nick = "nickinfo";  

            // nick + from 组成邮箱的发件人信息  

        } catch (Exception e) {  

            e.printStackTrace();  

        }  

    }  

 

    /**

     * 发送邮件

     *  

     * @param to

     *            收件人列表，以","分割

     * @param subject

     *            标题

     * @param body

     *            内容

     * @param filepath

     *            附件列表,无附件传递null

     * @return

     * @throws MessagingException

     * @throws AddressException

     * @throws UnsupportedEncodingException

     */  

    public static boolean sendMail(String to, String subject, String body,  

            List<String> filepath) throws AddressException, MessagingException,  

            UnsupportedEncodingException {  

        // 参数修饰  

        if (body == null) {  

            body = "";  

        }  

        if (subject == null) {  

            subject = "无主题";  

        }  

        // 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.auth", "true"); // 通过验证  

        props.put("mail.smtp.port", "465");

        props.put("mail.transport.protocol", "smtp");

        props.put("mail.smtp.ssl.enable", "true");

       //props.put("mail.debug", "true");

        // 得到默认的对话对象  

        Session session = Session.getDefaultInstance(props, null);  

        // 创建一个消息，并初始化该消息的各项元素  

        MimeMessage msg = new MimeMessage(session);  

        nick = MimeUtility.encodeText(nick);  

        msg.setFrom(new InternetAddress(nick + "<" + from + ">"));  

        // 创建收件人列表  

        if (to != null && to.trim().length() > 0) {  

            String[] arr = to.split(",");  

            int receiverCount = arr.length;  

            if (receiverCount > 0) {  

                InternetAddress[] address = new InternetAddress[receiverCount];  

                for (int i = 0; i < receiverCount; i++) {  

                    address[i] = new InternetAddress(arr[i]);  

                }  

                msg.addRecipients(Message.RecipientType.TO, address);  

                msg.setSubject(subject);  

                // 后面的BodyPart将加入到此处创建的Multipart中  

                Multipart mp = new MimeMultipart();  

                // 附件操作  

                if (filepath != null && filepath.size() > 0) {  

                    for (String filename : filepath) {  

                        MimeBodyPart mbp = new MimeBodyPart();  

                        // 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);  

                    }  

                    MimeBodyPart mbp = new MimeBodyPart();  

                    mbp.setText(body);  

                    mp.addBodyPart(mbp);  

                    // 移走集合中的所有元素  

                    filepath.clear();  

                    // Multipart加入到信件  

                    msg.setContent(mp);  

                } else {  

                    // 设置邮件正文  

                    msg.setText(body);  

                }  

                // 设置信件头的发送日期  

                msg.setSentDate(new Date());  

                msg.saveChanges();  

                // 发送信件  

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

                transport.connect(username, password);

                transport.sendMessage(msg,  

                        msg.getRecipients(Message.RecipientType.TO));  

                transport.close();  

                return true;  

            } else {  

                System.out.println("None receiver!");  

                return false;  

            }  

        } else {  

            System.out.println("None receiver!");  

            return false;  

        }  

    }  

 

    public static void main(String[] args) throws AddressException,  

            UnsupportedEncodingException, MessagingException {  

        sendMail("toother@qq.com,yourqq@qq.com", "注册信息邮件", "注册邮件，有附件", null);

        System.out.println("sendMail success!");

    }  

}

准备过程:

1.QQ邮箱两个

2.发送邮件的jar包

mail.jar

<dependency>

            <groupId>javax.mail</groupId>

            <artifactId>mail</artifactId>

            <version>1.5.0-b01</version>

</dependency>

3.用QQ给QQ发送邮件，发送方得开启第三方登录，也就是授权登录，下面就是获取授权码解释链接

需要开始POP3和SMTP，还有点击生成授权码

4.java代码(上面已附)

5运行,最后显示 250 Mail OK即发送成功

中间可能遇到的问题:

1.邮箱，帐号，密码配置不正确导致报connection failed error!

2.邮箱没有开启smpt协议。如上面步骤3操作

3.报 java.io.FileNotFoundException: 

原因是,eclipse 自带的mail jar包与maven导入的mail jar包冲突，删除掉j2ee中mail jar ，冲突即可解决！