java smtp 发送邮件

package com.foxti.szzy.util;

import java.util.Properties;

import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

public class MailUtil {
    public static void main(String[] args) {
        final String from = "发件人@qq.com";
        final String pwd = "授权码";
        String to = "收件人@qq.com";
        String host = "smtp.qq.com";

        // 获取系统属性
        Properties properties = System.getProperties();

        // 设置邮件服务器
        properties.setProperty("mail.smtp.host", host);
        properties.put("mail.smtp.auth", "true");
        Session session = Session.getDefaultInstance(properties, new Authenticator() {
            public PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(from, pwd); // 发件人邮件用户名、授权码
            }
        });

        try {
            // 创建默认的 MimeMessage 对象
            MimeMessage message = new MimeMessage(session);
            // Set From: 头部头字段
            message.setFrom(new InternetAddress(from));
            // Set To: 头部头字段
            message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));
            // Set Subject: 头部头字段
            message.setSubject("This is the Subject Line!");
            // 设置消息体
            message.setText("This is actual message");
            // 发送消息
            Transport.send(message);
            System.out.println("Sent message successfully....");
        } catch (Exception mex) {
            mex.printStackTrace();
        }
    }

}