【Email】邮件发送

前言

　　项目主要是通过Java进行Email的发送，需要注意邮件发送的频率、内容，不然会被识别成垃圾邮件。

正文

　　1.前端代码：

Ps:需要注意引用layui的文件，并且需要注意引用的路径问题。　　

# spring mvc
spring.mvc.static-path-pattern=/static/**
# resources
spring.resources.static-locations=classpath:/static

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="utf-8">
    <title>SendEmail</title>
    <link rel="stylesheet" type="text/css" href="../../static/layui/css/layui.css"/>
    <style type="text/css">
        form {
            margin-top: 20px;
        }

        .layui-input {
            width: 300px;
        }

        .layui-textarea {
            width: 300px;
            height: 150px;
        }
    </style>
</head>
<body>
<form class="layui-form" action="/sendEmail/send" enctype="multipart/form-data" method="post">
    <div class="layui-form-item">
        <label class="layui-form-label">From</label>
        <div class="layui-input-block">
            <input type="text" name="from" class="layui-input" value="" />
        </div>
    </div>
    <div class="layui-form-item">
        <label class="layui-form-label">To</label>
        <div class="layui-input-block">
            <input type="text" name="to" class="layui-input" value="" />
        </div>
    </div>
    <div class="layui-form-item">
        <label class="layui-form-label">Subject</label>
        <div class="layui-input-block">
            <input type="text" name="subject" class="layui-input" autocomplete="off"/>
        </div>
    </div>
    <div class="layui-form-item">
        <label class="layui-form-label">Affix</label>
        <div class="layui-input-block">
            <button type="button" class="layui-btn" name="file" id="affix">
                <i class="layui-icon">&#xe64c;</i>附件
            </button>
        </div>
    </div>
    <div class="layui-form-item">
        <label class="layui-form-label">Content</label>
        <div class="layui-input-block">
            <textarea class="layui-textarea" name="content"></textarea>
        </div>
    </div>
    <div class="layui-form-item">
        <div class="layui-input-block">
            <button id="send" class="layui-btn" lay-submit lay-filter="formDemo">Send</button>
        </div>
    </div>
</form>
<span th:text="${msg}"></span>
</body>
</html>
<script type="text/javascript" src="../../static/layui/layui.js"></script>
<script type="text/javascript">
    layui.use('upload', function () {
        var upload = layui.upload;
        upload.render({
            elem: '#affix',
            auto: false,
            accept: 'file',
            bindAction: '#send',
            error: function (index, upload) {
                upload.preventDefault();
            }
        });
    });
</script>

　　2.工具类EmailUtil

package com.example.utils;

import org.springframework.web.multipart.MultipartFile;

import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.FileDataSource;
import javax.mail.*;
import javax.mail.internet.*;
import java.io.File;
import java.io.IOException;
import java.util.Properties;

public class EmailUtil {

    /**
     * 保存附件并返回附件路径字符串
     *
     * @param file
     * @return
     */
    public static String saveFile(MultipartFile file, String fileName) {
        //文件保存路径
        File filePath = new File("src/main/resources/file" + File.separator + fileName);
        // 路径字符串
        String path = filePath.getAbsolutePath();
        if (!filePath.exists()) {
            try {
                file.transferTo(new File(path));
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return path;
    }

    /**
     * 发送邮件
     *
     * @param fileName
     * @param from
     * @param to
     * @param subject
     * @param content
     * @param path
     * @return
     */
    public static String send(String fileName, String from, String to, String subject, String content, String path) {
        // 消息
        String msg = "";
        // 服务器
        String host = "smtp.163.com";
        // 用户名
        String user = "**********";
        // 密码（授权码）
        String pwd = "**********";
        Properties prop = new Properties();
        // 发送服务器属性
        prop.put("mail.smtp.host", host);
        // 验证
        prop.put("mail.smtp.auth", "true");
        Session session = Session.getDefaultInstance(prop);
        // debug
        session.setDebug(true);
        // 定义消息对象
        MimeMessage message = new MimeMessage(session);
        try {
            message.setFrom(new InternetAddress(from));
            message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));
            message.setSubject(subject);
            Multipart multipart = new MimeMultipart();
            BodyPart contentPart = new MimeBodyPart();
            contentPart.setText(content);
            multipart.addBodyPart(contentPart);
            if (path != null && path != "") {
                BodyPart affixPart = new MimeBodyPart();
                DataSource dataSource = new FileDataSource(path);
                affixPart.setDataHandler(new DataHandler(dataSource));
                affixPart.setFileName(MimeUtility.encodeText(fileName));
                multipart.addBodyPart(affixPart);
            }
            message.setContent(multipart);
            message.saveChanges();
            Transport transport = session.getTransport("smtp");
            transport.connect(host, user, pwd);
            transport.sendMessage(message, message.getAllRecipients());
            transport.close();
            msg = "发送成功！";
        } catch (Exception e) {
            msg = "发送失败！";
            e.printStackTrace();
        }
        return msg;
    }

}

　　3.Controller

package com.example.controller;

import com.example.utils.EmailUtil;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

@Controller
@RequestMapping("/sendEmail")
public class SendEmailController {

    /**
     * 初始化页面
     * @return
     */
    @RequestMapping(value = "/initIndexPage", method = RequestMethod.GET)
    public String initIndexPage() {
        return "email/index";
    }

    /**
     * 发送邮件
     * @param from
     * @param to
     * @param subject
     * @param file
     * @param content
     * @param model
     * @return
     * @throws Exception
     */
    @RequestMapping(value = "/send", method = RequestMethod.POST)
    public String send(@RequestParam("from") String from,
                       @RequestParam("to") String to,
                       @RequestParam("subject") String subject,
                       @RequestParam("file") MultipartFile file,
                       @RequestParam("content") String content,
                       Model model) throws Exception {
        String fileName = "";
        String path = "";
        if (file.getSize()>0) {
            fileName = file.getOriginalFilename();
            path = EmailUtil.saveFile(file, fileName);
        }
        String msg = EmailUtil.send(fileName, from, to, subject, content, path);
        model.addAttribute("msg", msg);
        return "email/index";
    }
}