邮件发送

maven依赖

<!-- https://mvnrepository.com/artifact/javax.mail/mail -->
    <dependency>
      <groupId>javax.mail</groupId>
      <artifactId>mail</artifactId>
      <version>1.4.7</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/javax.activation/activation -->
    <dependency>
      <groupId>javax.activation</groupId>
      <artifactId>activation</artifactId>
      <version>1.1.1</version>
    </dependency>

普通邮件

package org.example.test;

import com.sun.mail.util.MailSSLSocketFactory;

import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.util.Properties;

public class MailDemo {
    public static void main(String[] args) throws Exception {
        Properties properties = new Properties();
        properties.setProperty("mail.host","smtp.qq.com");//设置QQ邮件服务器
        properties.setProperty("mail.transport.protocol","smtp");//邮件发送协议
        properties.setProperty("mail.smtp.auth","true");//需要验证用户名和密码
        //关于QQ邮箱，还要设置SSL加密，加上以下代码即可
        MailSSLSocketFactory mailSSLSocketFactory = new MailSSLSocketFactory();
        mailSSLSocketFactory.setTrustAllHosts(true);
        properties.put("mail.smtp.ssl.enable","true");
        properties.put("mail.smtp.ssl.socketFactory",mailSSLSocketFactory);
        //使用JavaMail发送邮件的5个步骤

        //1、创建定义整个应用程序所需的环境信息的Session对象
        //QQ才有！其他邮箱不用
        Session session = Session.getDefaultInstance(properties, new Authenticator() {
            @Override
            protected PasswordAuthentication getPasswordAuthentication() {
                //发件人邮件用户名、授权码
                return new PasswordAuthentication("你的qq号", "你的授权码");
            }
        });
        //开启Session的debug模式，这样就可以查看到程序发送Email的运行状态
        session.setDebug(true);
        //2、通过session得到transport对象
        Transport transport = session.getTransport();
        //3、使用邮箱的用户名和授权码连上邮件服务器
        transport.connect("smtp.qq.com","你的qq号","你的授权码");
        //4、创建邮件
        //需要传递Session
        MimeMessage mimeMessage = new MimeMessage(session);
        //指明邮件的发件人
        mimeMessage.setFrom(new InternetAddress("你的qq号"));
        //指明邮件的收件人，如果发件人和收件人是一样的，那就是自己给自己发
        mimeMessage.setRecipient(Message.RecipientType.TO,new InternetAddress("收件人qq号"));
        //邮件的标题
        mimeMessage.setSubject("测试邮件");
        //邮件的文本内容
        mimeMessage.setContent("<h3>您好！测试邮件请勿回复！！！</h3>","text/html;charset=utf-8");
        //5、发送邮件
        transport.sendMessage(mimeMessage,mimeMessage.getAllRecipients());
        //6、关闭连接
        transport.close();
    }
}

附件邮件

package org.example.test;

import com.sun.mail.util.MailSSLSocketFactory;

import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.util.Properties;

public class MailDemo {
    public static void main(String[] args) throws Exception {
        Properties properties = new Properties();
        properties.setProperty("mail.host","smtp.qq.com");//设置QQ邮件服务器
        properties.setProperty("mail.transport.protocol","smtp");//邮件发送协议
        properties.setProperty("mail.smtp.auth","true");//需要验证用户名和密码
        //关于QQ邮箱，还要设置SSL加密，加上以下代码即可
        MailSSLSocketFactory mailSSLSocketFactory = new MailSSLSocketFactory();
        mailSSLSocketFactory.setTrustAllHosts(true);
        properties.put("mail.smtp.ssl.enable","true");
        properties.put("mail.smtp.ssl.socketFactory",mailSSLSocketFactory);
        //使用JavaMail发送邮件的5个步骤

        //1、创建定义整个应用程序所需的环境信息的Session对象
        //QQ才有！其他邮箱不用
        Session session = Session.getDefaultInstance(properties, new Authenticator() {
            @Override
            protected PasswordAuthentication getPasswordAuthentication() {
                //发件人邮件用户名、授权码
                return new PasswordAuthentication("你的qq号", "你的授权码");
            }
        });
        //开启Session的debug模式，这样就可以查看到程序发送Email的运行状态
        session.setDebug(true);
        //2、通过session得到transport对象
        Transport transport = session.getTransport();
        //3、使用邮箱的用户名和授权码连上邮件服务器
        transport.connect("smtp.qq.com","你的qq号","你的授权码");
        //4、创建邮件
        //需要传递Session
        MimeMessage mimeMessage = new MimeMessage(session);
        //指明邮件的发件人
        mimeMessage.setFrom(new InternetAddress("你的qq号"));
        //指明邮件的收件人，如果发件人和收件人是一样的，那就是自己给自己发
        mimeMessage.setRecipient(Message.RecipientType.TO,new InternetAddress("收件人qq号"));
        //邮件的标题
        mimeMessage.setSubject("测试邮件");
        //准备图片数据
        MimeBodyPart image = new MimeBodyPart();
        //图片需要经过数据处理，DataHandler：数据处理
        DataHandler dataHandler = new DataHandler(new FileDataSource("附件路径"));
        image.setDataHandler(dataHandler);//在MimeBodyPart中放入处理的图片的数据
        image.setContentID("起一个附件id");//给图片设置一个ID，在后面可以使用
        //准备正文数据
        MimeBodyPart text = new MimeBodyPart();
        text.setContent("这是一封附件邮件。<img src='cid:附件id'/>","text/html;charset=utf-8");
        //描述数据关系
        MimeMultipart mimeMultipart = new MimeMultipart();
        mimeMultipart.addBodyPart(text);
        mimeMultipart.addBodyPart(image);
        mimeMultipart.setSubType("related");
        //设置到消息中，保存修改
        mimeMessage.setContent(mimeMultipart);//把编辑好的邮件放入到消息中
        mimeMessage.saveChanges();//保存修改
        //5、发送邮件
        transport.sendMessage(mimeMessage,mimeMessage.getAllRecipients());
        //6、关闭连接
        transport.close();
    }
}