发送邮件到Gmail帐户 [英] send mail to Gmail account

问题描述

我从我的Java应用程序向Gmail帐户发送邮件。我曾使用Java邮件API，它工作正常。但是，是否可以在不使用Java中的邮件API的情况下发送电子邮件？

我的意思是使用套接字：

  public class Main {
 public static void main（String [] args）throws Exception {
 String host =smtp.gmail.com; 
 int port = 465; 
 String =[e-mail]; 
 String toAddr =[e-mail]; 
 
 
 Socket servSocket = new Socket（host，port）; 
 DataOutputStream os = new DataOutputStream（servSocket.getOutputStream（））; 
 DataInputStream is = new DataInputStream（servSocket.getInputStream（））; 
 
 if（servSocket！= null&& os！= null&& is！= null）{
 os.writeBytes（HELO\r\\\
） ; 
 os.writeBytes（MAIL From：+ from +\r\\\
）; 
 os.writeBytes（RCPT To：+ toAddr +\r\\\
）; 
 os.writeBytes（DATA \r\\\
）; 
 os.writeBytes（X-Mailer：Java \r\\\
）; 
 os.writeBytes（DATE：+ DateFormat.getDateInstance（DateFormat.FULL，
 Locale.US）.format（new Date（））+\r\\\
）; 
 os.writeBytes（From：+ from +\r\\\
）; 
 os.writeBytes（To：+ toAddr +\r\\\
）; 
} 
 
 os.writeBytes（Subject：\r\\\
）; 
 os.writeBytes（body \r\\\
）; 
 os.writeBytes（\r\\\
.\r\\\
）; 
 os.writeBytes（QUIT \r\\\
）; 
字符串响应; （（responseline = is.readUTF（））！= null）{
 if（responseline.indexOf（Ok）！= -1）
 break; 
} 
} 
} 
  

但它不起作用，它不发送邮件。谁能告诉我可能是什么问题？

b $ b

  public class SMTPDemo {
 
 public static void main（String args []）throws IOException，
 UnknownHostException {
 String msgFile =file.txt; 
 String =[e-mail]; 
 String to =[e-mail]; 
 String mailHost =yourHost; 
 SMTP邮件=新SMTP（mailHost）; 
 if（mail！= null）{
 if（mail.send（new FileReader（msgFile），from，to））{
 System.out.println（Mail sent。） ; 
} else {
 System.out.println（连接到SMTP服务器失败！）; 
} 
} 
 System.out.println（完成。）; 
} 
 
静态类SMTP {
 private final static int SMTP_PORT = 25; 
 
 InetAddress mailHost; 
 
 InetAddress localhost; 
 
 BufferedReader in; 
 
 PrintWriter out; 
 
 public SMTP（String host）throws UnknownHostException {
 mailHost = InetAddress.getByName（host）; 
 localhost = InetAddress.getLocalHost（）; 
 System.out.println（mailhost =+ mailHost）; 
 System.out.println（localhost =+ localhost）; 
 System.out.println（SMTP构造函数done \\\
）; 
 
 $ b $ public boolean send（FileReader msgFileReader，String from，String to）
抛出IOException {
 Socket smtpPipe; 
 InputStream inn; 
 OutputStream outt; 
 BufferedReader味精; 
 msg =新的BufferedReader（msgFileReader）; 
 smtpPipe =新的套接字（mailHost，SMTP_PORT）; 
 if（smtpPipe == null）{
 return false; 
} 
 inn = smtpPipe.getInputStream（）; 
 outt = smtpPipe.getOutputStream（）; 
 in = new BufferedReader（new InputStreamReader（inn））; 
 out = new PrintWriter（new OutputStreamWriter（outt），true）; 
 if（inn == null || outt == null）{
 System.out.println（无法打开流到套接字。）; 
返回false; 
} 
 String initialID = in.readLine（）; 
 System.out.println（initialID）; 
 System.out.println（HELO+ localhost.getHostName（））; 
 out.println（HELO+ localhost.getHostName（））; 
 String welcome = in.readLine（）; 
 System.out.println（欢迎）; 
 System.out.println（MAIL From：<+ from +>）; 
 out.println（MAIL From：<+ from +>）; 
字符串senderOK = in.readLine（）; 
 System.out.println（senderOK）; 
 System.out.println（RCPT TO：<+ to +>）; 
 out.println（RCPT TO：<+ to +>）; 
字符串recipientOK = in.readLine（）; 
 System.out.println（recipientOK）; 
 System.out.println（DATA）; 
 out.println（DATA）; 
字符串行; （（line = msg.readLine（））！= null）{
 out.println（line）; 
 while 
} 
 System.out.println（。）; 
 out.println（。）; 
 String acceptedOK = in.readLine（）; 
 System.out.println（acceptedOK）; 
 System.out.println（QUIT）; 
 out.println（QUIT）; 
返回true; 
 
 
 
  

- > http://www.java2s.com/Code/Java/Network-Protocol/SendingMailUsingSockets.htm

I am sending mail from my Java app to Gmail Account. I had used the Java Mail API and it worked fine. But is it possible to send an e-mail without using the mail API in java?

I mean just by using sockets:

public class Main {
  public static void main(String[] args) throws Exception {
    String host = "smtp.gmail.com";
    int port = 465;
    String from = "[e-mail]";
    String toAddr = "[e-mail]";


    Socket servSocket = new Socket(host, port);
    DataOutputStream os = new DataOutputStream(servSocket.getOutputStream());
    DataInputStream is = new DataInputStream(servSocket.getInputStream());

    if (servSocket != null && os != null && is != null) {
      os.writeBytes("HELO\r\n");
      os.writeBytes("MAIL From:" + from + " \r\n");
      os.writeBytes("RCPT To:" + toAddr + "\r\n");
      os.writeBytes("DATA\r\n");
      os.writeBytes("X-Mailer: Java\r\n");
      os.writeBytes("DATE: " + DateFormat.getDateInstance(DateFormat.FULL, 
                                   Locale.US).format(new Date()) + "\r\n");
      os.writeBytes("From:" + from + "\r\n");
      os.writeBytes("To:" + toAddr + "\r\n");
    }

    os.writeBytes("Subject:\r\n");
    os.writeBytes("body\r\n");
    os.writeBytes("\r\n.\r\n");
    os.writeBytes("QUIT\r\n");
    String responseline;
    while ((responseline = is.readUTF()) != null) { 
      if (responseline.indexOf("Ok") != -1)
        break;
    }
  }
}

But it is not working, it doesn't send out the mail. Can anyone tell me what could be the problem?

解决方案

Here is a good example:

public class SMTPDemo {

  public static void main(String args[]) throws IOException,
      UnknownHostException {
    String msgFile = "file.txt";
    String from = "[e-mail]";
    String to = "[e-mail]";
    String mailHost = "yourHost";
    SMTP mail = new SMTP(mailHost);
    if (mail != null) {
      if (mail.send(new FileReader(msgFile), from, to)) {
        System.out.println("Mail sent.");
      } else {
        System.out.println("Connect to SMTP server failed!");
      }
    }
    System.out.println("Done.");
  }

  static class SMTP {
    private final static int SMTP_PORT = 25;

    InetAddress mailHost;

    InetAddress localhost;

    BufferedReader in;

    PrintWriter out;

    public SMTP(String host) throws UnknownHostException {
      mailHost = InetAddress.getByName(host);
      localhost = InetAddress.getLocalHost();
      System.out.println("mailhost = " + mailHost);
      System.out.println("localhost= " + localhost);
      System.out.println("SMTP constructor done\n");
    }

    public boolean send(FileReader msgFileReader, String from, String to)
        throws IOException {
      Socket smtpPipe;
      InputStream inn;
      OutputStream outt;
      BufferedReader msg;
      msg = new BufferedReader(msgFileReader);
      smtpPipe = new Socket(mailHost, SMTP_PORT);
      if (smtpPipe == null) {
        return false;
      }
      inn = smtpPipe.getInputStream();
      outt = smtpPipe.getOutputStream();
      in = new BufferedReader(new InputStreamReader(inn));
      out = new PrintWriter(new OutputStreamWriter(outt), true);
      if (inn == null || outt == null) {
        System.out.println("Failed to open streams to socket.");
        return false;
      }
      String initialID = in.readLine();
      System.out.println(initialID);
      System.out.println("HELO " + localhost.getHostName());
      out.println("HELO " + localhost.getHostName());
      String welcome = in.readLine();
      System.out.println(welcome);
      System.out.println("MAIL From:<" + from + ">");
      out.println("MAIL From:<" + from + ">");
      String senderOK = in.readLine();
      System.out.println(senderOK);
      System.out.println("RCPT TO:<" + to + ">");
      out.println("RCPT TO:<" + to + ">");
      String recipientOK = in.readLine();
      System.out.println(recipientOK);
      System.out.println("DATA");
      out.println("DATA");
      String line;
      while ((line = msg.readLine()) != null) {
        out.println(line);
      }
      System.out.println(".");
      out.println(".");
      String acceptedOK = in.readLine();
      System.out.println(acceptedOK);
      System.out.println("QUIT");
      out.println("QUIT");
      return true;
    }
  }
}

-> http://www.java2s.com/Code/Java/Network-Protocol/SendingMailUsingSockets.htm

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