<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>

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(fā)送郵件工具類
?*/
public class MailUtil {
?? ?
?? ?private final static Logger logger = LoggerFactory.getLogger(MailUtil.class);
?? ?
?? ?/**
?? ? * 郵件發(fā)送
?? ? * @param mailHost 郵件服務地址
?? ? * @param fromMail 發(fā)件人
?? ? * @param fromName 發(fā)件人名
?? ? * @param fromMailPwd 發(fā)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(nèi)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(fā)送人不能為空");
?? ??? ?}
?? ??? ?
?? ??? ?// 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(jù)屬性新建一個郵件會話
?? ??? ?//session.setDebug(true); // 是否打印調(diào)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(fā)件人的地址
?? ??? ??? ?message.setRecipient(Message.RecipientType.TO, new InternetAddress(to, fromName));// 設置收件人,并設置其接收類型為TO
?? ??? ??? ?message.setSubject(mailTitle);// 設置標題
?? ??? ??? ?message.setContent(mailContent, "text/html;charset=UTF-8"); // 設置郵件內(nèi)容類型為html
?? ??? ??? ?message.setSentDate(new Date());// 設置發(fā)信時間
?? ??? ??? ?message.saveChanges();// 存儲郵件信息

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

?? ?/**
?? ? * 郵件發(fā)送（群發(fā)）
?? ? * @param mailHost 郵件服務地址
?? ? * @param fromMail 發(fā)件人
?? ? * @param fromName 發(fā)件人名
?? ? * @param fromMailPwd 發(fā)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(nèi)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(fā)送人不能為空");
?? ??? ?}
?? ??? ?
?? ??? ?// 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(jù)屬性新建一個郵件會話
?? ??? ?//session.setDebug(true); // 是否打印調(diào)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(fā)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,并設置其接收類型為TO
?? ??? ?message.setSubject(mailTitle); // 設置標題
?? ??? ?message.setContent(mailContent, "text/html;charset=UTF-8"); // 設置郵件內(nèi)容類型為html
?? ??? ?message.setSentDate(new Date()); // 設置發(fā)信時間
?? ??? ?message.saveChanges(); // 存儲郵件信息

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

?? ?/**
?? ? * 讀取html文件為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);
?? ??? ??? ?}
?? ??? ?}
?? ?}

}

<!DOCTYPE html>
<html>
?? ?<head>
?? ??? ?<meta charset="utf-8"/>
?? ??? ?<title>java 郵件發(fā)送</title>
?? ?</head>
?? ?<body>
?? ??? ?<h1 id="title"></h1>
?? ??? ?<div id="content"></div>
?? ?</body>
</html>

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(nèi)容
?? ??? ?Document doc = Jsoup.parse(html);
?? ??? ?doc.getElementById("title").html("java 郵件發(fā)送測試");
?? ??? ?doc.getElementById("content").html("么么噠");
?? ??? ?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(fā)送郵件
?? ??? ?MailUtil.sendMail(mailHost, fromMail, fromName, fromMailPwd, toMails, mailTitle, mailContent);
?? ?}
}