工具类：
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.PropertySource;
import org.springframework.core.env.Environment;
import org.springframework.stereotype.Service;

import javax.mail.Address;
import javax.mail.Message;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.io.UnsupportedEncodingException;
import java.util.Date;
import java.util.Properties;

@Service
@PropertySource("classpath:mail.properties")
public class MailService {
@Autowired
private Environment env;
private static String match = "^[\w-]+(\.[\w-]+)@[\w-]+(\.[\w-]+)+$";
private int port; // 端口
private String server;// 邮件服务器
private String fromName; // 发送时显示的名字
private String user; // 发送的用户名email
private String password;// 密码
private Properties props = new Properties(); // 属性
private Session session; // 一次会话
private String[] cc;
private boolean isload = false;
private String SSL_FACTORY;
/*
*
* @param port
* 服务器端口号 入25
* @param server
* 邮件发送服务器 如：smtp.163.com
* @param fromName
* 发件人的名字 如：我
* @param user
* 邮箱账号 如：xxx@163.com
* @param password
* 邮箱密码
*/
public void init() {
if(isload){
return;
}
this.port = Integer.parseInt(env.getProperty("mail.port"));//25;
this.server = env.getProperty("mail.stmp");//"smtp.mxhichina.com";
this.fromName = env.getProperty("mail.from");
this.user = env.getProperty("mail.from");
this.password = env.getProperty("mail.password");

    String otheremail = env.getProperty("cc");
    if(!StringUtils.isEmpty(otheremail)){
        cc = otheremail.split(",");
    }
    //
    props.put("mail.smtp.host", server);
    props.put("mail.smtp.socketFactory.port", String.valueOf(port));
    props.put("mail.smtp.port", String.valueOf(port));
    props.put("mail.smtp.auth", "true");
    
    try {
        // 得到一次会话
        MailAuthenticator myauth = new MailAuthenticator(user, password);
        session = Session.getDefaultInstance(props, myauth);
        // 得到通道
        //Transport transport = session.getTransport("smtp");
        // 连接
        //transport.connect(server, user, password);
    } catch (Exception e) {
        e.printStackTrace();
    }
    isload = true;
}

/**
 * 发送邮件
 * 
 * @param toEmail
 *            目的地地址
 * @param subject
 *            邮件标题
 * @param body
 *            邮件正文
 * @throws UnsupportedEncodingException
 */
public void sendEmail(String toEmail,String subject, String body) {
    init();
    try {
        // 验证email
        if (!toEmail.matches(match)) {
            return;
        }
        // 发送的邮件地址
        InternetAddress fromAddress = null;
        InternetAddress[] toAddress = new InternetAddress[1];
        // 创建消息
        MimeMessage msg = new MimeMessage(session);
        // 设置发送日期
        msg.setSentDate(new Date());
        fromAddress = new InternetAddress(user, fromName, "UTF-8");
        msg.setFrom(fromAddress);
        toAddress[0] = new InternetAddress(toEmail);
        msg.setRecipients(Message.RecipientType.TO, toAddress);
        if (null != cc) {
            Address[] ccAdresses = new InternetAddress[cc.length];
            for (int i = 0; i < cc.length; i++) {
                ccAdresses[i] = new InternetAddress(cc[i]);
            }
            // 将抄送者信息设置到邮件信息中
            msg.setRecipients(Message.RecipientType.CC, ccAdresses);
        }
        // 标题

        msg.setSubject(subject, "UTF-8");
        // 文本体

        msg.setContent(body, "text/html;charset = utf-8");  
        msg.setText(body, "UTF-8");
        msg.saveChanges();
        // 发送
        Transport.send(msg, msg.getAllRecipients());
    } catch (Exception e) {
        e.printStackTrace();
    }
}

}
配置：

mail.port=465
mail.stmp=smtp.mxhichina.com
mail.from=xxxx@xxx.com
mail.password=xxxxxxxx
mail.factory=javax.net.ssl.SSLSocketFactory
阿里企业邮箱：
25端口已被封禁，所以使用465端口，
需加入设置
props.setProperty("mail.smtp.socketFactory.class",SSL_FACTORY);
props.setProperty("mail.smtp.socketFactory.fallback","false");
端口：
25（smtp）,简单邮件传输协议
465（smtps）smtp-over-SSL 协议