Java利用自己的郵箱傳送郵件需要一下兩個jar包
activation.jar 下面為下載地址及方法
http://www.oracle.com/technetwork/java/javasebusiness/downloads/java-archive-downloads-java-plat-419418.html#7017-jaf-1.1.1-oth-JPR

mail.jar下面為下載地址及方法
http://www.oracle.com/technetwork/java/javasebusiness/downloads/java-archive-downloads-eeplat-419426.html#javamail-1.4.7-oth-JPR

package com.nuanshui.frms.exchange.demo.utils;

import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.Message;
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.FileOutputStream;
import java.util.Properties;

public class EmailUtil {

        /**
         * @param args
         * @throws Exception
         */
        public static void main(String[] args) throws Exception {

            Properties prop = new
 
 Properties();
            prop.setProperty("mail.host", "傳送伺服器地址");
            prop.setProperty("mail.transport.protocol", "smtp");
            prop.setProperty("mail.smtp.auth", "true");
            //使用JavaMail傳送郵件的5個步驟
            //1、建立session
            Session session = Session.getInstance(prop);
            //開啟Session的debug模式，這樣就可以檢視到程式傳送Email的執行狀態
            session.setDebug(true);
            //2、通過session得到transport物件
            Transport ts = session.getTransport();
            //3、連上郵件伺服器
            ts.connect("傳送伺服器地址", "本地郵箱", "郵箱密碼");
            //4、建立郵件
            Message message = createAttachMail(session);
            //5、傳送郵件
            ts.sendMessage(message, message.getAllRecipients());
            ts.close();
        }

        /**
         * @Method: createAttachMail
         * @Description: 建立一封帶附件的郵件
         *
         * @param session
         * @return
         * @throws Exception
         */
        public static MimeMessage createAttachMail(Session session) throws Exception{
            MimeMessage message = new MimeMessage(session);

            //設定郵件的基本資訊
            //發件人
            message.setFrom(new InternetAddress("發件人郵箱 "));
            //收件人
            message.setRecipient(Message.RecipientType.TO, new InternetAddress("收件人郵箱"));
            //郵件標題
            message.setSubject("標題");

            //建立郵件正文，為了避免郵件正文中文亂碼問題，需要使用charset=UTF-8指明字元編碼
            MimeBodyPart text = new MimeBodyPart();
            text.setContent("郵件文字內容", "text/html;charset=UTF-8");

            //建立郵件附件
            MimeBodyPart attach = new MimeBodyPart();
            DataHandler dh = new DataHandler(new FileDataSource("D:/附件地址/附件名稱.xlsx"));
            attach.setDataHandler(dh);
            attach.setFileName(dh.getName());  //

            //建立容器描述資料關係
            MimeMultipart mp = new MimeMultipart();
            mp.addBodyPart(text);
            mp.addBodyPart(attach);
            mp.setSubType("mixed");

            message.setContent(mp);
            message.saveChanges();
            //將建立的Email寫入到E盤儲存
            message.writeTo(new FileOutputStream("d:\\attachMail.eml"));
            //返回生成的郵件
            return message;
        }
}