一、一般配置

发送邮件需要用到  mail包 maven 依赖如下：

 <!-- https://mvnrepository.com/artifact/javax.mail/mail -->

         <dependency>

             <groupId>javax.mail</groupId>

             <artifactId>mail</artifactId>

             <version>1.4</version>

         </dependency>

SSL加密方式需要用到MailSSLSocketFactory类

<!-- https://mvnrepository.com/artifact/com.sun.mail/javax.mail -->

        <dependency>

            <groupId>com.sun.mail</groupId>

            <artifactId>javax.mail</artifactId>

            <version>1.4.4</version>

        </dependency>

获取配置文件：

 //获取邮箱发送邮件的配置信息

     public Properties getEmailProperties(){

         Properties props = new Properties();

         String host = evn.getProperty("email.host");

         String protocol = evn.getProperty("email.protocol");

         String port = evn.getProperty("email.port");

         String from = evn.getProperty("email.from");

         String pwd = evn.getProperty("email.password");

         props.put("mail.smtp.host", host);//设置服务器地址

         props.put("mail.store.protocol" , protocol);//设置协议

         props.put("mail.smtp.port", port);//设置端口

         props.put("from" , from);

         props.put("pwd" , pwd);

         props.put("mail.smtp.auth" , "true");

         return props;

     }

邮件发送代码类：

 /**

  *

  * @file springBootExample.example.infrastructure

  *

  */

 package com.tyky.educloud.platform.util;

 /**

  * @ClassName: SendEmail

  * @Description: TODO(这里用一句话描述这个类的作用)

  * @author hoojjack

  * @date 2017年7月19日 下午3:23:42

  *

  */

 import java.util.Date;

 import java.util.Properties;

 import javax.mail.Authenticator;

 import javax.mail.Message;

 import javax.mail.MessagingException;

 import javax.mail.PasswordAuthentication;

 import javax.mail.Session;

 import javax.mail.Transport;

 import javax.mail.internet.AddressException;

 import javax.mail.internet.InternetAddress;

 import javax.mail.internet.MimeMessage;

 public class SendEmail {

     public static Properties props = new Properties();

     public static void setProps(Properties props) {

         SendEmail.props = props;

     }

     public static Properties getProps() {

         return props;

     }

     /**

      * 获取Session

      *

      * @return

      */

     private static Session getSession(final String from, final String pwd) {

         Authenticator authenticator = new Authenticator() {

             @Override

             protected PasswordAuthentication getPasswordAuthentication() {

                 return new PasswordAuthentication(from, pwd);

             }

         };

         Session session = Session.getDefaultInstance(props, authenticator);

         return session;

     }

     public static void send(String content, String toEmail) throws AddressException, MessagingException {

         Properties properties = getProps();

         String from = properties.getProperty("from");

         String pwd = properties.getProperty("pwd");

         String subject = properties.getProperty("subject");

         if (null == from || null == pwd) {

             System.out.println("发送邮箱为空");

             return;

         }

         if (null == subject) {

             subject = "平台";

         }

         Session session = getSession(from, pwd);

         // Instantiate a message

         Message msg = new MimeMessage(session);

         // Set message attributes

         msg.setFrom(new InternetAddress(from));

         InternetAddress[] address = { new InternetAddress(toEmail) };

         msg.setRecipients(Message.RecipientType.TO, address);

         msg.setSubject(subject);

         msg.setSentDate(new Date());

         msg.setContent(content, "text/html;charset=utf-8");

         // Send the message

         Transport.send(msg);

     }

     public static String generateContent(String contentTitle, String url, String username, String email,

             String validateCode) {

         // String validataCode = MD5Util.encode2hex(email);

         /// 邮件的内容

         StringBuffer sb = new StringBuffer(contentTitle);

         sb.append("<a href=\"" + url + "?username=");

         sb.append(username);

         sb.append("&email=");

         sb.append(email);

         sb.append("&validateCode=");

         sb.append(validateCode);

         sb.append("\">" + url + "?username=");

         sb.append(username);

         sb.append("&email=");

         sb.append(email);

         sb.append("&validateCode=");

         sb.append(validateCode);

         sb.append("</a>");

         return sb.toString();

     }

 }

邮件发送完整的代码：

 /**

  * @ClassName: SendEmail

  * @Description: TODO(这里用一句话描述这个类的作用)

  * @author hoojjack

  * @date 2017年7月19日 下午3:23:42

  *

  */

 import java.util.Date;

 import java.util.Properties;

 import javax.mail.Authenticator;

 import javax.mail.Message;

 import javax.mail.MessagingException;

 import javax.mail.PasswordAuthentication;

 import javax.mail.Session;

 import javax.mail.Transport;

 import javax.mail.internet.AddressException;

 import javax.mail.internet.InternetAddress;

 import javax.mail.internet.MimeMessage;

 public class SendEmail {

     public static Properties props = new Properties();

     public static void setProps(Properties props) {

         SendEmail.props = props;

     }

     public static Properties getProps() {

         props.put("mail.smtp.host", "smtp.163.com");// 设置服务器地址

         props.put("mail.store.protocol", "smtp.163.com");// 设置协议

         props.put("mail.smtp.port", 25);// 设置端口

         props.put("from", "XXX");

         props.put("pwd", "XXX");

         props.put("mail.smtp.auth", "true");

     }

     /**

      * 获取Session

      *

      * @return

      */

     private static Session getSession(final String from, final String pwd) {

         Authenticator authenticator = new Authenticator() {

             @Override

             protected PasswordAuthentication getPasswordAuthentication() {

                 return new PasswordAuthentication(from, pwd);

             }

         };

         Session session = Session.getDefaultInstance(props, authenticator);

         return session;

     }

     public static void send(String content, String toEmail) throws AddressException, MessagingException {

         Properties properties = getProps();

         String from = properties.getProperty("from");

         String pwd = properties.getProperty("pwd");

         String subject = properties.getProperty("subject");

         if (null == from || null == pwd) {

             System.out.println("发送邮箱为空");

             return;

         }

         if (null == subject) {

             subject = "平台";

         }

         Session session = getSession(from, pwd);

         // Instantiate a message

         Message msg = new MimeMessage(session);

         // Set message attributes

         msg.setFrom(new InternetAddress(from));

         InternetAddress[] address = { new InternetAddress(toEmail) };

         msg.setRecipients(Message.RecipientType.TO, address);

         msg.setSubject(subject);

         msg.setSentDate(new Date());

         msg.setContent(content, "text/html;charset=utf-8");

         // Send the message

         Transport.send(msg);

     }

     public static String generateContent(String contentTitle, String url, String username, String email,

             String validateCode) {

         // String validataCode = MD5Util.encode2hex(email);

         /// 邮件的内容

         StringBuffer sb = new StringBuffer(contentTitle);

         sb.append("<a href=\"" + url + "?username=");

         sb.append(username);

         sb.append("&email=");

         sb.append(email);

         sb.append("&validateCode=");

         sb.append(validateCode);

         sb.append("\">" + url + "?username=");

         sb.append(username);

         sb.append("&email=");

         sb.append(email);

         sb.append("&validateCode=");

         sb.append(validateCode);

         sb.append("</a>");

         return sb.toString();

     }

 }

以下是两种不同加密方式的代码，与上面默认25端口的方式差别较小，注意不同加密方式红色部分。

1. JavaMail – via TLS

 package com.mkyong.common;

 import java.util.Properties;

 import javax.mail.Message;

 import javax.mail.MessagingException;

 import javax.mail.PasswordAuthentication;

 import javax.mail.Session;

 import javax.mail.Transport;

 import javax.mail.internet.InternetAddress;

 import javax.mail.internet.MimeMessage;

 public class SendMailTLS {

     public static void main(String[] args) {

         final String username = "username@gmail.com";

         final String password = "password";

         Properties props = new Properties();

         props.put("mail.smtp.auth", "true");

         props.put("mail.smtp.starttls.enable", "true");

         props.put("mail.smtp.host", "smtp.gmail.com");

         props.put("mail.smtp.port", "587");

         Session session = Session.getInstance(props,

           new javax.mail.Authenticator() {

             protected PasswordAuthentication getPasswordAuthentication() {

                 return new PasswordAuthentication(username, password);

             }

           });

         try {

             Message message = new MimeMessage(session);

             message.setFrom(new InternetAddress("from-email@gmail.com"));

             message.setRecipients(Message.RecipientType.TO,

                 InternetAddress.parse("to-email@gmail.com"));

             message.setSubject("Testing Subject");

             message.setText("Dear Mail Crawler,"

                 + "\n\n No spam to my email, please!");

             Transport.send(message);

             System.out.println("Done");

         } catch (MessagingException e) {

             throw new RuntimeException(e);

         }

     }

 }

2. JavaMail – via SSL

package com.mkyong.common;

import java.util.Properties;

import javax.mail.Message;

import javax.mail.MessagingException;

import javax.mail.PasswordAuthentication;

import javax.mail.Session;

import javax.mail.Transport;

import javax.mail.internet.InternetAddress;

import javax.mail.internet.MimeMessage;

public class SendMailSSL {

    public static void main(String[] args) {

        Properties props = new Properties();

        props.put("mail.smtp.host", "smtp.gmail.com");

        props.put("mail.smtp.socketFactory.port", "465");

        props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");

        props.put("mail.smtp.auth", "true");

        props.put("mail.smtp.port", "465");

        Session session = Session.getDefaultInstance(props,

            new javax.mail.Authenticator() {

                protected PasswordAuthentication getPasswordAuthentication() {

                    return new PasswordAuthentication("username","password");

                }

            });

        try {

            Message message = new MimeMessage(session);

            message.setFrom(new InternetAddress("from@no-spam.com"));

            message.setRecipients(Message.RecipientType.TO,

                    InternetAddress.parse("to@no-spam.com"));

            message.setSubject("Testing Subject");

            message.setText("Dear Mail Crawler," +

                    "\n\n No spam to my email, please!");

            Transport.send(message);

            System.out.println("Done");

        } catch (MessagingException e) {

            throw new RuntimeException(e);

        }

    }

}

注意：如果以上ssl不行可以尝试将ssl红色部分用以下代码替换：

      MailSSLSocketFactory sf = null;

      try {

            sf = new MailSSLSocketFactory();

            sf.setTrustAllHosts(true);

      } catch (GeneralSecurityException e1) {

            e1.printStackTrace();

      }

      props.put("mail.smtp.ssl.enable", "true");

      props.put("mail.smtp.ssl.socketFactory", sf);

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