Java发送邮件

本文只是简单说明一下使用java实现邮件发送，具体业务具体封装。

废话不多说，直接上码。

1、使用spring cloud项目，引用依赖

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-mail</artifactId>
        </dependency>

2、配置相关信息，具体配置参数取值，登录自己的邮件服务器查看，每家的配置都不一样，我这里使用的是腾讯的企业邮箱。

spring:
  mail:
    host: smtp.exmail.qq.com
    port: 465
    username: uud@nuosoon.com
    password: 12smik
    protocol: smtps
    properties:
      mail:
        display:
          sendname: 迈极集团
          sendmail: 迈极集团
    from: admin@nuosoon.com

app:
  mail:
    defaultFrom: uud@nuosoon.com
    warningTo: weilikoo@qq.com

3、封装自己的发送邮件类。

package com.vlihub.common.helper;

import com.alibaba.fastjson.JSON;
import com.vlihub.common.configs.AppMailConfig;
import com.vlihub.common.exception.VlihubException;
import com.vlihub.common.model.vo.MailAttachment;
import com.vlihub.common.model.vo.MailInfo;
import lombok.extern.slf4j.Slf4j;
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.Service;
import org.springframework.util.StringUtils;

import javax.activation.DataSource;
import javax.activation.URLDataSource;
import javax.annotation.Resource;
import javax.mail.internet.MimeMessage;
import java.io.File;
import java.net.URL;

/**
 * 创建人：  537974（韦立）
 * 创建时间: 2021-2-2 13:52
 */
@Service
@Slf4j
public class MailHelper {

    @Resource
    private JavaMailSender mailSender;

    @Resource
    private AppMailConfig appMailConfig;

    /**
     * 发送文本邮件
     */
    public void sendTextMail(MailInfo mailInfo) {
        try {
            SimpleMailMessage message = new SimpleMailMessage();
            message.setFrom(mailInfo.getFrom());
            message.setTo(mailInfo.getTo());
            if (mailInfo.getBcc() != null) {
                message.setBcc(mailInfo.getBcc());
            }
            if (mailInfo.getCc() != null) {
                message.setCc(mailInfo.getCc());
            }
            message.setSubject(mailInfo.getSubject());
            message.setText(mailInfo.getText());
            mailSender.send(message);
        } catch (Exception e) {
            log.error("邮件发送失败，内容：" + JSON.toJSONString(mailInfo) + ";\r\n 异常信息：" + e.toString());
        }
    }

    /**
     * 发送邮件
     */
    public void sendMail(MailInfo mailInfo) {
        try {
            MimeMessage message = mailSender.createMimeMessage();
            MimeMessageHelper helper = new MimeMessageHelper(message, true);
            if (!StringUtils.isEmpty(mailInfo.getFrom())) {
                helper.setFrom(mailInfo.getFrom());
            } else {
                helper.setFrom(appMailConfig.getDefaultFrom());
            }
            helper.setTo(mailInfo.getTo());
            if (mailInfo.getBcc() != null) {
                helper.setBcc(mailInfo.getBcc());
            }
            if (mailInfo.getCc() != null) {
                helper.setCc(mailInfo.getCc());
            }
            helper.setSubject(mailInfo.getSubject());
            helper.setText(mailInfo.getText(), mailInfo.getIsHtml());
            setAttachment(mailInfo, helper);

            mailSender.send(message);
        } catch (Exception e) {
            log.error("邮件发送失败，内容：" + JSON.toJSONString(mailInfo) + ";\r\n 异常信息：" + e.toString());
        }
    }

    private void setAttachment(MailInfo mailInfo, MimeMessageHelper helper) {
        try {
            if (mailInfo.getAttachments() != null && mailInfo.getAttachments().size() > 0) {
                for (MailAttachment att : mailInfo.getAttachments()) {
                    if (StringUtils.isEmpty(att.getPath()) && StringUtils.isEmpty(att.getUrl())) {
                        continue;
                    }
                    if (!StringUtils.isEmpty(att.getUrl())) {
                        String[] name = att.getUrl().split("/");
                        URL url = new URL(att.getUrl());
                        DataSource source = new URLDataSource(url);
                        if (StringUtils.isEmpty(att.getName())) {
                            helper.addAttachment(name[name.length - 1], source);
                        } else {
                            helper.addAttachment(att.getName(), source);
                        }
                        continue;
                    }
                    if (!StringUtils.isEmpty(att.getPath())) {
                        FileSystemResource file = new FileSystemResource(new File(att.getPath()));
                        String fileName = att.getPath().substring(att.getPath().lastIndexOf(File.separator));
                        if (StringUtils.isEmpty(att.getName())) {
                            helper.addAttachment(fileName, file);
                        } else {
                            helper.addAttachment(att.getName(), file);
                        }
                    }
                }
            }
        } catch (Exception e) {
            throw new VlihubException(e);
        }
    }
}

4、测试发送功能。

    @Resource
    private MailHelper mailHelper;

    @Override
    public BaseResult<String> sendMailTest() {
        MailInfo mailInfo = new MailInfo();
        List<MailAttachment> attachments = new ArrayList<>();
        MailAttachment attachment1 = new MailAttachment();
        attachment1.setName("PDF模板制作.png");
        attachment1.setUrl("https://file.mainki.com/2021-01-19/1611063778634.png");
        attachments.add(attachment1);

        mailInfo.setIsHtml(false);
        mailInfo.setTo(new String[]{"weilikoo@qq.com", "weili@giveu.cn"});
        mailInfo.setSubject("迈极集团-研发邮件");
        mailInfo.setText("请注意项目进度，注意代码质量，注意附件内容！");
        mailInfo.setAttachments(attachments);

        mailHelper.sendMail(mailInfo);
        return BaseResult.success();
    }

到这里就完成了邮件发送的开发。