邮件发送工具类

配置文件：

spring:
  mail:
    #主题前缀
    mailHead: 【xxx管理平台】
    #配置smtp服务器地址
    host: smtp.xxxxx.cn
    #协议 默认就是smtp
    protocol: smtp
    #发送者邮箱
    username: [email protected]
    #配置密码或者授权码
    password: xxxxxx
    #smtp的指定端口(465或587)
    port: 465
    #默认的邮件编码为UTF-8
    default-encoding: UTF-8
    #配置SSL 加密工厂
    properties:
      mail:
        smtp:
          auth: true
          ssl:
            enable: true
            trust: ${spring.mail.host}

工具类

package org.isbg.common.util;

import cn.hutool.core.convert.Convert;
import lombok.extern.slf4j.Slf4j;
import org.isbg.common.constant.SymbolConstant;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.core.io.FileSystemResource;
import org.springframework.mail.SimpleMailMessage;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.MimeMessageHelper;
import org.springframework.stereotype.Component;

import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;
import java.io.File;
import java.util.List;

/**
 * 发邮件
 *
 */
@Slf4j
@Component
public class EmailUtil {

    @Autowired
    private JavaMailSender mailSender;
    @Value("${spring.mail.mailHead:}")
    private String mailHead;
    @Value("${spring.mail.username}")
    private String fromUser;

    /**
     * 简单文本邮件
     *
     * @param toUsers 收件人(多人用英文逗号分割:"[email protected],[email protected],[email protected]")
     * @param subject 主题
     * @param content 内容
     */
    public void sendSimpleMail(String toUsers, String subject, String content) {
        sendSimpleMail(toUsers, null, subject, content);
    }

    /**
     * 简单文本邮件
     *
     * @param toUsers 收件人(多人用英文逗号分割:"[email protected],[email protected],[email protected]")
     * @param ccUsers 抄送人(多人用英文逗号分割:"[email protected],[email protected],[email protected]")
     * @param subject 主题
     * @param content 内容
     */
    public void sendSimpleMail(String toUsers, String ccUsers, String subject, String content) {
        //创建SimpleMailMessage对象
        SimpleMailMessage message = new SimpleMailMessage();
        //邮件发送人
        message.setFrom(fromUser);
        //邮件接收人
        message.setTo(toUsers.split(SymbolConstant.COMMA));
        //邮件抄送人
        if (ObjectUtils.isNotEmpty(ccUsers)) {
            message.setCc(ccUsers.split(SymbolConstant.COMMA));
        }
        //邮件主题
        message.setSubject(mailHead + subject);
        //邮件内容
        message.setText(content);
        //发送邮件
        mailSender.send(message);
    }


    /**
     * html邮件
     *
     * @param toUsers 收件人(多人用英文逗号分割:"[email protected],[email protected],[email protected]")
     * @param subject 主题
     * @param content 内容
     */
    public void sendHtmlMail(String toUsers, String subject, String content) throws MessagingException {
        sendHtmlMail(toUsers, null, subject, content);
    }

    /**
     * html邮件
     *
     * @param toUsers 收件人(多人用英文逗号分割:"[email protected],[email protected],[email protected]")
     * @param ccUsers 抄送人(多人用英文逗号分割:"[email protected],[email protected],[email protected]")
     * @param subject 主题
     * @param content 内容
     * @throws MessagingException
     */
    public void sendHtmlMail(String toUsers, String ccUsers, String subject, String content) throws MessagingException {
        MimeMessage message = mailSender.createMimeMessage();
        MimeMessageHelper messageHelper;
        messageHelper = new MimeMessageHelper(message, true);
        //邮件发送人
        messageHelper.setFrom(fromUser);
        //邮件接收人
        messageHelper.setTo(toUsers.split(SymbolConstant.COMMA));
        //邮件抄送人
        if (ObjectUtils.isNotEmpty(ccUsers)) {
            messageHelper.setCc(ccUsers.split(SymbolConstant.COMMA));
        }
        //邮件主题
        message.setSubject(mailHead + subject);
        //邮件内容，html格式
        messageHelper.setText(content, true);
        //发送
        mailSender.send(message);
    }

    /**
     * 带附件的邮件
     *
     * @param toUsers  收件人(多人用英文逗号分割:"[email protected],[email protected],[email protected]")
     * @param subject  主题
     * @param content  内容
     * @param filePath 附件地址
     * @throws MessagingException
     */
    public void sendAttachFileMailByPath(String toUsers, String subject, String content, String filePath) throws MessagingException {
        sendAttachFileMailByPath(toUsers, null, subject, content, filePath);
    }

    /**
     * 带附件的邮件
     *
     * @param toUsers      收件人(多人用英文逗号分割:"[email protected],[email protected],[email protected]")
     * @param subject      主题
     * @param content      内容
     * @param filePathList 附件地址列表
     * @throws MessagingException
     */
    public void sendAttachFileMailByPath(String toUsers, String subject, String content, List filePathList) throws MessagingException {
        sendAttachFileMailByPath(toUsers, null, subject, content, filePathList);
    }

    /**
     * 带附件的邮件
     *
     * @param toUsers  收件人(多人用英文逗号分割:"[email protected],[email protected],[email protected]")
     * @param ccUsers  抄送人(多人用英文逗号分割:"[email protected],[email protected],[email protected]")
     * @param subject  主题
     * @param content  内容
     * @param filePath 附件地址
     * @throws MessagingException
     */
    public void sendAttachFileMailByPath(String toUsers, String ccUsers, String subject, String content, String filePath) throws MessagingException {
        sendAttachFileMailByPath(toUsers, ccUsers, subject, content, Convert.toList(String.class, filePath));
    }

    /**
     * 带附件的邮件
     *
     * @param toUsers      收件人(多人用英文逗号分割:"[email protected],[email protected],[email protected]")
     * @param ccUsers      抄送人(多人用英文逗号分割:"[email protected],[email protected],[email protected]")
     * @param subject      主题
     * @param content      内容
     * @param filePathList 附件地址列表
     * @throws MessagingException
     */
    public void sendAttachFileMailByPath(String toUsers, String ccUsers, String subject, String content, List filePathList) throws MessagingException {
        MimeMessage message = mailSender.createMimeMessage();
        MimeMessageHelper helper = new MimeMessageHelper(message, true);
        helper.setFrom(fromUser);
        //邮件接收人
        helper.setTo(toUsers.split(SymbolConstant.COMMA));
        //邮件抄送人
        if (ObjectUtils.isNotEmpty(ccUsers)) {
            helper.setCc(ccUsers.split(SymbolConstant.COMMA));
        }
        helper.setSubject(mailHead + subject);
        helper.setText(content, true);
        for (String filePath : filePathList) {
            FileSystemResource file = new FileSystemResource(new File(filePath));
            String fileName = FileUtil.getName(filePath);
            helper.addAttachment(fileName, file);
        }
        mailSender.send(message);
    }

    /**
     * 带附件的邮件
     *
     * @param toUsers 收件人(多人用英文逗号分割:"[email protected],[email protected],[email protected]")
     * @param subject 主题
     * @param content 内容
     * @param file    附件
     * @throws MessagingException
     */
    public void sendAttachFileMail(String toUsers, String subject, String content, File file) throws MessagingException {
        sendAttachFileMail(toUsers, null, subject, content, file);
    }

    /**
     * 带附件的邮件
     *
     * @param toUsers  收件人(多人用英文逗号分割:"[email protected],[email protected],[email protected]")
     * @param subject  主题
     * @param content  内容
     * @param fileList 附件列表
     * @throws MessagingException
     */
    public void sendAttachFileMail(String toUsers, String subject, String content, List fileList) throws MessagingException {
        sendAttachFileMail(toUsers, null, subject, content, fileList);
    }

    /**
     * 带附件的邮件
     *
     * @param toUsers 收件人(多人用英文逗号分割:"[email protected],[email protected],[email protected]")
     * @param ccUsers 抄送人(多人用英文逗号分割:"[email protected],[email protected],[email protected]")
     * @param subject 主题
     * @param content 内容
     * @param file    附件
     * @throws MessagingException
     */
    public void sendAttachFileMail(String toUsers, String ccUsers, String subject, String content, File file) throws MessagingException {
        sendAttachFileMail(toUsers, ccUsers, subject, content, Convert.toList(File.class, file));
    }

    /**
     * 带附件的邮件
     *
     * @param toUsers  收件人(多人用英文逗号分割:"[email protected],[email protected],[email protected]")
     * @param ccUsers  抄送人(多人用英文逗号分割:"[email protected],[email protected],[email protected]")
     * @param subject  主题
     * @param content  内容
     * @param fileList 附件列表
     * @throws MessagingException
     */
    public void sendAttachFileMail(String toUsers, String ccUsers, String subject, String content, List fileList) throws MessagingException {
        MimeMessage message = mailSender.createMimeMessage();
        MimeMessageHelper helper = new MimeMessageHelper(message, true);
        helper.setFrom(fromUser);
        //邮件接收人
        helper.setTo(toUsers.split(SymbolConstant.COMMA));
        //邮件抄送人
        if (ObjectUtils.isNotEmpty(ccUsers)) {
            helper.setCc(ccUsers.split(SymbolConstant.COMMA));
        }
        helper.setSubject(mailHead + subject);
        helper.setText(content, true);
        for (File file : fileList) {
            helper.addAttachment(file.getName(), file);
        }
        mailSender.send(message);
    }
}