介绍

发邮件mail是常见的软件功能，下面利于spring和java的mail库实现发送内容支持html，带多附件的案例

开启SMTP邮件发送协议

谁提供的SMTP邮件服务，就找谁开启。QQ邮箱类似。

依赖

        <!--Java MAil 发送邮件API-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-mail</artifactId>
        </dependency>
        <dependency>
            <groupId>javax.mail</groupId>
            <artifactId>javax.mail-api</artifactId>
            <version>1.6.2</version>
        </dependency>

代码

package com.mail;

import com.sun.xml.internal.messaging.saaj.packaging.mime.MessagingException;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.PropertySource;
import org.springframework.mail.javamail.JavaMailSenderImpl;
import org.springframework.mail.javamail.MimeMessageHelper;

import javax.mail.Authenticator;
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.File;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Properties;

/**
 * @version v1.0 创建时间：2023/11/20 15:59
 * @author: 作者：陈子枢
 * @web CSDN：https://blog.csdn.net/nutony
 * @description 描述：读取属性配置文件，发送邮件
 */

@Slf4j
@PropertySource("classpath:mail.properties")
public class MailClient {

    @Value("${host}")
    private String minioUrl;
    @Value("${port}")
    private int port;

    public static void sender(String form, String cc, String subject, String html, List<String> attachments) throws javax.mail.MessagingException {
        JavaMailSenderImpl sender = new JavaMailSenderImpl();
        sender.setHost("smtp.163.com");
        sender.setPort(25);

        sender.setUsername(form);
        sender.setPassword("配置的授权码");
        sender.setDefaultEncoding("UTF-8");

        // 简化对mimeMessage的封装
        MimeMessage message = sender.createMimeMessage();
        MimeMessageHelper helper = new MimeMessageHelper(sender.createMimeMessage(), true, "UTF-8");

        helper.setFrom(sender.getUsername());  //邮件发送人
        helper.setCc(cc);                  //抄送
        helper.setSubject(subject);            //标题
        helper.setText(html,true);       //正文

        //邮件附件
        for(String attachment: attachments) {
            File file = new File(attachment);
            helper.addAttachment(file.getName(), file);
        }
        sender.send(helper.getMimeMessage());
    }

    public static void main(String[] args) throws MessagingException, javax.mail.MessagingException {
        List<String> attachments = new ArrayList<>();
        attachments.add("d:\\1.png");
        attachments.add("d:\\2.png");

        MailClient.sender("13261758319@163.com", "52399178@qq.com", "HTML邮件", "<h1 style='color:red'>hello,world!</h1>",attachments);


        log.info("邮件发送成功！");

    }

}