最近公司有個需求，需要在意見反饋模組中增加發送郵件功能，看了網上好多的例子都是用的HtmlEmail和我需求不大一樣因此重新寫了一版傳送郵件程式碼供大家分享。

整理了個EmailUtils工具：1、傳送文字郵件 2、傳送附件郵件

jar包：activation.jar  additionnal.jar  mail.jar 自己去網上搜很多資源

import java.io.File;
import java.util.List;
import java.util.Properties;

import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import 
 
javax.mail.Authenticator;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import javax.mail.internet.MimeUtility;

/**
 
 * 郵件
 * Created by Administrator on 2018/3/26.
 */
@SuppressWarnings("all")
public class EmailUtils {

    private EmailUtils() {
    }

    public static EmailUtils getInstance() {
        return SafeMode.mEmailUtil;
    }

    public static class SafeMode {
        private static final EmailUtils mEmailUtil 
 
= new EmailUtils();
    }

    /**
     * 傳送郵件
     *
     * @param fromEmailAddress
* @param fromEmailPassword
* @param toEmailAddress
* @param Subject
* @param Content
* @return
*/
public boolean sendEmailMessages(String fromEmailAddress, String fromEmailPassword, String toEmailAddress, String Subject, String Content) {// 配置傳送及接收郵箱
try {
            Properties props = new Properties();
            props.put("mail.smtp.protocol", "smtp");
            props.put("mail.smtp.auth", "true");//設定要驗證
props.put("mail.smtp.host", "smtp.exmail.qq.com");//設定host
props.put("mail.smtp.port", "465");  //設定埠
props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");

            PassAuthenticator pass = new PassAuthenticator(fromEmailAddress, fromEmailPassword);   //獲取帳號密碼
Session session = Session.getInstance(props, pass); //獲取驗證會話
            // 始發郵箱
InternetAddress fromAddress = new InternetAddress(fromEmailAddress, fromEmailAddress);
            // 目標郵箱
InternetAddress toAddress = new InternetAddress(toEmailAddress, toEmailAddress);
            // 配置傳送資訊
MimeMessage message = new MimeMessage(session);
            MimeMultipart allMultipart = new MimeMultipart("mixed"); // 附件
message.setContent(allMultipart); // 發郵件時新增附件
message.setSubject(Subject);
            message.setText(Content, "UTF-8");
            message.setFrom(fromAddress);
            message.addRecipient(javax.mail.Message.RecipientType.TO, toAddress);
            message.saveChanges();
            // 連線郵箱併發送
Transport transport = session.getTransport("smtp");
            // 始發郵箱賬號密碼
transport.connect("smtp.exmail.qq.com", fromEmailAddress, fromEmailPassword);
            transport.send(message);
            transport.close();
            return true;
        } catch (Exception e) {
            Log.i("Simon", "sendEmailMessages Exception = " + e.getMessage());
        }
        return false;
    }

    /**
     * 傳送郵件-附件
     *
     * @param fromEmailAddress
* @param fromEmailPassword
* @param toEmailAddress
* @param Subject
* @param Content
* @param files
* @return
*/
public boolean sendEmailMessagesWithFiles(String fromEmailAddress, String fromEmailPassword, String toEmailAddress, String Subject, List<File> files) {
        Properties props = new Properties();
        props.put("mail.smtp.protocol", "smtp");
        props.put("mail.smtp.auth", "true");//設定要驗證
props.put("mail.smtp.host", "smtp.exmail.qq.com");//設定host
props.put("mail.smtp.port", "465");  //設定埠
props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");

        PassAuthenticator pass = new PassAuthenticator(fromEmailAddress, fromEmailPassword);   //獲取帳號密碼
Session session = Session.getInstance(props, pass); //獲取驗證會話
try {
            //配置傳送及接收郵箱
InternetAddress fromAddress, toAddress;
            // 發件郵箱
fromAddress = new InternetAddress(fromEmailAddress, fromEmailAddress);
            // 收件郵箱
toAddress = new InternetAddress(toEmailAddress, toEmailAddress);

            // 附件與內容 只能二選一
MimeMessage message = new MimeMessage(session);
            MimeMultipart allMultipart = new MimeMultipart("mixed"); //附件
for (File file : files) {
                MimeBodyPart attachPart = new MimeBodyPart();
                FileDataSource fds = new FileDataSource(file); //開啟要傳送的檔案
attachPart.setDataHandler(new DataHandler(fds));
                attachPart.setFileName(MimeUtility.encodeText(file.getName()));//TODO
// allMultipart.addBodyPart(attachPart);//新增
}
            message.setContent(allMultipart); //發郵件時新增附件
message.setSubject(Subject);
            message.setFrom(fromAddress);
            message.addRecipient(javax.mail.Message.RecipientType.TO, toAddress);
            message.saveChanges();
            // 連線郵箱併發送
Transport transport = session.getTransport("smtp");
            // 傳送郵件的賬號和密碼
transport.connect("smtp.exmail.qq.com", fromEmailAddress, fromEmailPassword);
            transport.send(message);
            transport.close();
        } catch (Exception e) {
            Log.i("Simon", "sendEmailMessagesWithFiles Exception = " + e.getMessage());
        }
        return false;
    }

    class PassAuthenticator extends Authenticator {
        String username;
        String password;

        public PassAuthenticator(String username, String password) {
            this.username = username;
            this.password = password;
        }

        public PasswordAuthentication getPasswordAuthentication() {
            // 添加發送郵箱的賬號和密碼
return new PasswordAuthentication(username, password);
        }
    }

}