使用Javamail發送html模板郵件

依賴

<dependency>
    <groupId>org.jsoup</groupId>
    <artifactId>jsoup</artifactId>
    <version>1.10.3</version>
</dependency>

<dependency>
    <groupId>javax.mail</groupId>
    <artifactId>mail</artifactId>
    <version>1.4.1</version>
</dependency>

工具類

package test.email;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.util.Date;
import java.util.Properties;
import javax.mail.Message;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 發送郵件工具類
 */
public class MailUtil {
	
	private final static Logger logger = LoggerFactory.getLogger(MailUtil.class);
	
	/**
	 * 郵件發送
	 * @param mailHost 郵件服務地址
	 * @param fromMail 發件人
	 * @param fromName 發件人名
	 * @param fromMailPwd 發件人密碼
	 * @param toMails 收件人，多個用英文逗號分隔
	 * @param mailTitle 郵件標題
	 * @param mailContent 郵件內容
	 * @throws Exception
	 */
	public static void sendMail(String mailHost, String fromMail, String fromName, String fromMailPwd,
			String toMails, String mailTitle, String mailContent) throws Exception {
		String[] toMailArr = null;
		if (toMails != null && !toMails.equals("")) {
			toMailArr = toMails.split(",");
		} else {
			throw new Exception("郵件發送人不能爲空");
		}
		
		// 郵件屬性信息
		Properties props = new Properties();
		props.put("mail.host", mailHost);
		props.put("mail.transport.protocol", "smtp");
		props.put("mail.smtp.auth", "true");
		
		Session session = Session.getInstance(props); // 根據屬性新建一個郵件會話
		//session.setDebug(true); // 是否打印調試信息
		toMailArr = toMails.split(",");
		for (String to : toMailArr) {
			MimeMessage message = new MimeMessage(session); // 由郵件會話新建一個消息對象
			message.setFrom(new InternetAddress(fromMail));// 設置發件人的地址
			message.setRecipient(Message.RecipientType.TO, new InternetAddress(to, fromName));// 設置收件人,並設置其接收類型爲TO
			message.setSubject(mailTitle);// 設置標題
			message.setContent(mailContent, "text/html;charset=UTF-8"); // 設置郵件內容類型爲html
			message.setSentDate(new Date());// 設置發信時間
			message.saveChanges();// 存儲郵件信息

			// 發送郵件
			Transport transport = session.getTransport();
			transport.connect(fromMail, fromMailPwd);
			transport.sendMessage(message, message.getAllRecipients());
			transport.close();
		}
	}

	/**
	 * 郵件發送（羣發）
	 * @param mailHost 郵件服務地址
	 * @param fromMail 發件人
	 * @param fromName 發件人名
	 * @param fromMailPwd 發件人密碼
	 * @param toMails 收件人，多個用英文逗號分隔
	 * @param mailTitle 郵件標題
	 * @param mailContent 郵件內容
	 * @throws Exception
	 */
	public static void sendGroupMail(String mailHost, String fromMail, String fromName, String fromMailPwd,
			String toMails, String mailTitle, String mailContent) throws Exception {
		String[] toMailArr = null;
		if (toMails != null && !toMails.equals("")) {
			toMailArr = toMails.split(",");
		} else {
			throw new Exception("郵件發送人不能爲空");
		}
		
		// 郵件屬性信息
		Properties props = new Properties();
		props.put("mail.host", mailHost);
		props.put("mail.transport.protocol", "smtp");
		props.put("mail.smtp.auth", "true");
		

		Session session = Session.getInstance(props); // 根據屬性新建一個郵件會話
		//session.setDebug(true); // 是否打印調試信息
		MimeMessage message = new MimeMessage(session); // 由郵件會話新建一個消息對象
		message.setFrom(new InternetAddress(fromMail)); // 設置發件人的地址
		InternetAddress[] sendTo = new InternetAddress[toMailArr.length];
		for (int i = 0; i < toMailArr.length; i++) {
			sendTo[i] = new InternetAddress(toMailArr[i], fromName);
		}
		message.setRecipients(Message.RecipientType.TO, sendTo); // 設置收件人,並設置其接收類型爲TO
		message.setSubject(mailTitle); // 設置標題
		message.setContent(mailContent, "text/html;charset=UTF-8"); // 設置郵件內容類型爲html
		message.setSentDate(new Date()); // 設置發信時間
		message.saveChanges(); // 存儲郵件信息

		// 發送郵件
		Transport transport = session.getTransport();
		transport.connect(fromMail, fromMailPwd);
		transport.sendMessage(message, message.getAllRecipients());
		transport.close();
	}

	/**
	 * 讀取html文件爲String
	 * @param htmlFileName
	 * @return
	 * @throws Exception
	 */
	public static String readHtmlToString(String htmlFileName) throws Exception{
		InputStream is = null;
		Reader reader = null;
		try {
			is = MailUtil.class.getClassLoader().getResourceAsStream(htmlFileName);
			if (is ==  null) {
				throw new Exception("未找到模板文件");
			}
			reader = new InputStreamReader(is, "UTF-8");  
			StringBuilder sb = new StringBuilder();
			int bufferSize = 1024;
			char[] buffer = new char[bufferSize];
			int length = 0;
			while ((length = reader.read(buffer, 0, bufferSize)) != -1){
				sb.append(buffer, 0, length);
			}
			return sb.toString();
		} finally {
			try {
				if (is != null) {
					is.close();
				}
			} catch (IOException e) {
				logger.error("關閉io流異常", e);
			}
			try {
				if (reader != null) {
					reader.close();
				}
			} catch ( IOException e) {
				logger.error("關閉io流異常", e);
			}
		}
	}

}

html模板

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8"/>
		<title>java 郵件發送</title>
	</head>
	<body>
		<h1 id="title"></h1>
		<div id="content"></div>
	</body>
</html>

測試

package test.email;

import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;

public class SendHtmlTemplateMail {
	
	public static void main(String[] args) throws Exception {
		// 讀取html模板
		String html = MailUtil.readHtmlToString("mailTemplate.html");
		
		// 寫入模板內容
		Document doc = Jsoup.parse(html);
		doc.getElementById("title").html("java 郵件發送測試");
		doc.getElementById("content").html("麼麼噠");
		String result = doc.toString();
		
		String mailHost = "smtp.qq.com";
		String fromMail = "";
		String fromName = "小灰";
		String fromMailPwd = "";
		String toMails = "";
		String mailTitle = "hello javamail";
		String mailContent = result;
        
		// 發送郵件
		MailUtil.sendMail(mailHost, fromMail, fromName, fromMailPwd, toMails, mailTitle, mailContent);
	}
}