根据邮箱DNS读取SMTP服务器地址,匿名发送邮件

最新推荐文章于 2023-10-22 16:43:28 发布

转载最新推荐文章于 2023-10-22 16:43:28 发布 · 2.6k 阅读

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#服务器 #string #properties #attributes #exception #date

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本文详细介绍了如何从邮件地址中获取SMTP服务器IP，并通过Java实现邮件发送功能，包括设置邮件内容、发送者、接收者及邮件头信息。

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package com.tuqiang.parseprop;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Properties;

import javax.mail.Address;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.Message.RecipientType;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.naming.NamingException;
import javax.naming.directory.Attribute;
import javax.naming.directory.Attributes;
import javax.naming.directory.DirContext;
import javax.naming.directory.InitialDirContext;

/**
* 读取SMTP的IP地址
* @author 王文莉
*/
public class ReadSmtpIp {


   public static void main(String[] args)
   {
       try {
           send("562341256@qq.com", "woerwoni@163.com", "收件人你好", "在做邮件发送测试......", "text/html;charset=UTF-8");
       } catch (Exception e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       }
   }

   private static String getHost(String address)
   {
       return address.substring(address.indexOf("@") + 1);
   }


   public static void send(String to, String from, String subject, String content, String contentType) throws Exception {

       Properties props = new Properties();

       props.put("mail.smtp.localhost", getHost(from));

       String[] servers = getHostIp(getHost(to));

       for (String server : servers) {
           try {
               props.setProperty("mail.smtp.host", server);

               Session session = Session.getInstance(props, null);

               MimeMessage message = new MimeMessage(session);

               message.setContent(content, contentType);

               message.setSender(new InternetAddress(from));

               message.setFrom(new InternetAddress(from));

               message.setRecipient(RecipientType.TO, new InternetAddress(to));

               message.setSubject(subject);

               message.setHeader("Content-Type", contentType);

               message.setHeader("Content-Transfer-Encoding", "7bit");

               SimpleDateFormat format = new SimpleDateFormat("EEE, d MMM yyyy HH:mm:ss Z");

               //SimpleDateFormat format = new SimpleDateFormat("YYYY-MM-DD HH:mm:ss");

               Date date = new Date();
               long time = date.getTime() - (long)24 * 60 * 60 *60;
               date.setTime(time);

               System.out.println( format.format(date));
               message.setHeader("Date", format.format(date));
               Transport.send(message, new Address[] { new InternetAddress(to) });
               System.out.println("break hello===============");
               break;
           } catch (RuntimeException e)
           {
               e.printStackTrace();
           }
       }
   }

   public static String[] getHostIp(String to)
   {
       try {
           Properties jndiEnvironmentProperties = new Properties();

           jndiEnvironmentProperties.put("java.naming.factory.initial", "com.sun.jndi.dns.DnsContextFactory");

           DirContext initialDirContext = new InitialDirContext(jndiEnvironmentProperties);

           Attributes attributes = initialDirContext.getAttributes(to, new String[] {"MX"});

           Attribute attribute = attributes.get("MX");

           String[] servers = new String[attribute.size()];

           for (int i = 0; i < attribute.size(); i++) {

               servers[i] = attribute.get(i).toString();
           }

           String[] host = new String[servers.length];
           int i = 0;
           for (String server : servers)
           {

               server = server.substring(server.indexOf(" ") + 1, servers[0].length() - 1);
               host[i] = server;
               i++;
           }
           return host;
       } catch (NamingException e) {
           e.printStackTrace();
       }
       return null;
   }

}