Java发送邮件jdk11- java.lang.NoClass

在jdk8以上需要包含2个jar包

• javamail: http://java.sun.com/products/javamail/downloads/index.html ，其中包括mail.jar和文档
• Activation.jar : http://www.oracle.com/technetwork/java/javasebusiness/downloads/java-archive-downloads-java-plat-419418.html#jaf-1.1.1-fcs-oth-JPR ,其中包括Activation.jar
• 然后在调用发送邮件的工具类 具体代码如下

package com.xmg.store.utils;

import java.util.Properties;

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

public class MailUtils {
    public static void sendMail(String email, String emailMsg)
            throws AddressException, MessagingException {
        // 1.创建一个程序与邮件服务器会话对象 Session
        Properties props = new Properties();
        //设置发送的协议
        //props.setProperty("mail.transport.protocol", "SMTP");

        //设置发送邮件的服务器
        props.setProperty("mail.host", "smtp.163.com");
        props.setProperty("mail.smtp.auth", "true");// 指定验证为true

        // 创建验证器
        Authenticator auth = new Authenticator() {
            public PasswordAuthentication getPasswordAuthentication() {
                //设置发送人的帐号和密码 你的密码
                return new PasswordAuthentication("simplyou@163.com", "xxxx");
            }
        };
        Session session = Session.getInstance(props, auth);

        // 2.创建一个Message，它相当于是邮件内容
        Message message = new MimeMessage(session);

        //设置发送者
        message.setFrom(new InternetAddress("simplyou@163.com"));

        //设置发送方式与接收者
        message.setRecipient(RecipientType.TO, new InternetAddress(email));

        //设置邮件主题
        message.setSubject("这是来自遥远的东方的一封邮件");
       
        //设置邮件内容
        message.setContent(emailMsg, "text/html;charset=utf-8");

        // 3.创建 Transport用于将邮件发送
        Transport.send(message);
    }
    public static void main(String[] args) throws AddressException, MessagingException {
        MailUtils.sendMail("997745354@qq.com", "邮件内容");
    }
}

• 如果不添加Activation.jar会报这个错误
  java.lang.NoClassDefFoundError: javax/activation/DataSource

• 输入发送者的邮箱和密码 权限验证一定要打开 如果不打开会报 com.sun.mail.smtp.SMTPSendFailedException: 553 authentication is required,163 smtp1,C9GowABHeFeyYeFb

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