javaMail的maven坐标：
<!-- /artifact/javax.mail/mail --><dependency><groupId>javax.mail</groupId><artifactId>mail</artifactId><version>1.4</version></dependency>
注意：
阿里云邮箱默认是开启了smtp，所以无需在阿里云邮箱设置这个（目前是这样的，.10.19）；163邮箱普通用户是不能通过smtp协议发送邮件，除非是vip用户。
发送邮件代码：
package com.day24.JavaMail;import java.util.Properties;import javax.mail.Message;import javax.mail.MessagingException;import javax.mail.Session;import javax.mail.Transport;import javax.mail.internet.AddressException;import javax.mail.internet.InternetAddress;import javax.mail.internet.MimeMessage;public class MailTestForAliYunExample {public static void main(String[] args) throws MessagingException {Properties prop=new Properties();prop.put("mail.host","" );prop.put("mail.transport.protocol", "smtp");prop.put("mail.smtp.auth", "true");//使用java发送邮件5步骤//1.创建sesssionSession session=Session.getInstance(prop);//开启session的调试模式，可以查看当前邮件发送状态session.setDebug(true);//2.通过session获取Transport对象（发送邮件的核心API）Transport ts=session.getTransport();//3.通过邮件用户名密码链接，阿里云默认是开启个人邮箱pop3、smtp协议的，所以无需在阿里云邮箱里设置ts.connect("XXXX@", "password");//4.创建邮件Message msg=createSimpleMail(session);//5.发送电子邮件ts.sendMessage(msg, msg.getAllRecipients());}public static MimeMessage createSimpleMail(Session session) throws AddressException,MessagingException{//创建邮件对象MimeMessage mm=new MimeMessage(session);//设置发件人mm.setFrom(new InternetAddress("XXXX@"));//设置收件人mm.setRecipient(Message.RecipientType.TO, new InternetAddress("targetUser@"));//设置抄送人mm.setRecipient(, new InternetAddress("XXXX@"));mm.setSubject("XXX网站注册邮件！");mm.setContent("验证码为690", "text/html;charset=gbk");return mm;}}
