Java Mail 发送邮件（SSL加密方式，TSL加密方式）

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);