java se da cuenta de enviar correo electrónico

A través del blog de Boss

https://blog.csdn.net/baolingye/article/details/96598222

Propio entendimiento

package com.ceh.test;

import com.sun.mail.util.MailSSLSocketFactory;

import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import java.security.GeneralSecurityException;
import java.util.Properties;

/**
 * java发送邮件测试
 */
public class JavaEmailTest {
    
    
    public static void main(String[] args) throws Exception {
    
    
        //创建properties文件，并赋予参数
        Properties prop = new Properties();
        //设置发件人邮箱服务器地址（可在邮箱官网查看：qq：smtp.qq.com 端口号465/587）
        prop.setProperty("mail.host","smtp.qq.com");
        //邮件发送的协议
        prop.setProperty("mail.transport.protocol","smtp");
        //是否需要验证用户名和密码
        prop.setProperty("mail.smtp.auth","true");


        //ssl验证：qq邮箱是启用了ssl验证了，如果出现错误与ssl有关，就添加下面的代码
        // QQ邮箱设置SSL加密
        MailSSLSocketFactory sf = new MailSSLSocketFactory();
        sf.setTrustAllHosts(true);
        prop.put("mail.smtp.ssl.enable", "true");
        prop.put("mail.smtp.ssl.socketFactory", sf);


        //创建发送邮件有关的session环境
        Session session = Session.getDefaultInstance(prop, new Authenticator() {
    
    
            @Override
            protected PasswordAuthentication getPasswordAuthentication() {
    
    
                //传入发件人的姓名和授权码
                return new PasswordAuthentication("haha","utcbtbizoarzhifj");
            }
        });

        //开启debug模式
        session.setDebug(true);

        //2、通过session获取transport对象
        Transport transport = session.getTransport();
        //3、通过transport对象邮箱用户名和授权码连接邮箱服务器
        transport.connect("smtp.qq.com","[email protected]","utcbtbizoarzhifj");



        创建一个邮件
        MimeMessage mimeMessage = new MimeMessage(session);
        //发件人
        mimeMessage.setFrom(new InternetAddress("[email protected]"));
        //收件人
        mimeMessage.setRecipient(Message.RecipientType.TO,new InternetAddress("[email protected]"));
        //邮件标题
        mimeMessage.setSubject("带图片和附件的邮件");

        //======================================================================================
        //邮件内容
        //准备图片数据
        MimeBodyPart image = new MimeBodyPart();
        DataHandler handler = new DataHandler(new FileDataSource("E:\\image\\a.png"));
        image.setDataHandler(handler);
        image.setContentID("a.png"); //设置图片id


        //准备文本  这是显示在正文中的内容，可以把图片引入过来
        MimeBodyPart text = new MimeBodyPart();
        text.setContent("这是一段文本<a href='https://www.baidu.com/'><img src='cid:a.png'></a>","text/html;charset=utf-8");

        //拼装邮件正文 -->  把图片和文本封装在一起，文本才能正常的引入图片
        MimeMultipart mimeMultipart = new MimeMultipart();
        mimeMultipart.addBodyPart(image);
        mimeMultipart.addBodyPart(text);
        mimeMultipart.setSubType("related");//文本和图片内嵌成功

        //将拼装好的正文内容设置为主体
        MimeBodyPart contentText = new MimeBodyPart();
        contentText.setContent(mimeMultipart);
        //=============================================================================

        //附件 --->在邮箱中下载的文件
        MimeBodyPart appendix = new MimeBodyPart();
        appendix.setDataHandler(new DataHandler(new FileDataSource("E:\\image\\haha.txt")));
        appendix.setFileName("test.txt");

        //拼接附件和正文到住体
        MimeMultipart allFile = new MimeMultipart();
        allFile.addBodyPart(appendix);//附件
        allFile.addBodyPart(contentText);//正文
        allFile.setSubType("mixed"); //正文和附件都存在邮件中，所有类型设置为mixed

        //把所有的内容放到邮件中
        mimeMessage.setContent(allFile);
        mimeMessage.saveChanges();//保存修改

        //5、发送邮件
        transport.sendMessage(mimeMessage,mimeMessage.getAllRecipients());

        //释放资源
        transport.close();
    }
}

Necesita importar <javamail.jar>