CS►network►网络协议-OSI七层模型►1. 第七层 应用层

introduction

三种实现：

  • python的smtplib
  • javamail.lib
  • 自己写简易socket实现
  • telnet实现

smtplib实现发送email

  1. 利用smtplib发送email，源代码。

见song.common.autoalert.email.send.py:

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# 以python源代码为基准
import smtplib  
from email.mime.text import MIMEText  
from config import *
import socket

def send_mail(to_list,subject,content):  
    me="hello"+"<"+mail_user+"@"+mail_postfix+">"  
    msg = MIMEText(content,_subtype='plain',_charset='gb2312')  
    msg['Subject'] = subject
    msg['From'] = me
    msg['To'] = ";".join(to_list)  
    try:  
        server = smtplib.SMTP()

        server.connect(smtp_host, smtp_port) # 这里有response吗？加ssl连接吗？
        server.ehlo()  # 与服务器打招呼，并告知客户端使用的机器名字，可以随便填写
        server.starttls() # 登录时需要启动TLS加密 (smtp服务器规定的)
        server.login(mail_user,mail_pass)  # 这里做了什么？建立了tls加密的socket连接，然后发送加密后的数据获取认证吗？
        server.sendmail(me, to_list, msg.as_string())  # 这里有response吗，没有response应该就是UDP连接吧
        server.close()
        return True  
    except Exception, e:  
        print str(e)  
        return False  

if __name__ == '__main__':  
    if send_mail(mailto_list,"hello","send from python smtplib"):  
        print "发送成功"  
    else:  
        print "发送失败"
  1. 修改源代码 smtpliba.py
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def putcmd(self, cmd, args=""):
    """Send a command to the server."""
    if args == "":
        str = '%s%s' % (cmd, CRLF)
    else:
        str = '%s %s%s' % (cmd, args, CRLF)
    print 'sending:' + str  # 在smtpliba.py中添加这一行代码
    self.send(str)
  1. 运行
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# Authentication methods
Authentication methods the server supports:
authlist: ['LOGIN', 'PLAIN', 'XOAUTH2']  # outlook竟然还支持plain的登录方式？

# authmethod = AUTH_PLAIN
sending: ehlo [192.168.253.1]
sending: STARTTLS
sending: ehlo [192.168.253.1]
sending: AUTH PLAIN AHMyamFja3NvbkBob3RtYWlsLmNvbQBrZGY4KmRmNSFzNF9q
sending: mail FROM:<s2jackson@hotmail.com> size=215
sending: rcpt TO:<13521649928@139.com>
sending: data
# 发送成功

# authmethod = AUTH_LOGIN
sending: ehlo [192.168.253.1]
sending: STARTTLS
sending: ehlo [192.168.253.1]
sending: AUTH LOGIN czJqYWNrc29uQGhvdG1haWwuY29t
sending: a2RmOCpkZjUhczRfag==
sending: mail FROM:<s2jackson@hotmail.com> size=215
sending: rcpt TO:<13521649928@139.com>
sending: data
# 发送成功

javamail实现

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// 以java源代码为基准
package song.net.mail.demo;

import javax.mail.*;
import javax.mail.internet.*;
import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.PasswordAuthentication;
import java.util.Properties;
import song.config.Info;

public class SendWithAuth {
    private static final String SMTP_HOST_NAME = Info.SMTP_HOST;
    private static final Integer SMTP_PORT = Info.SMTP_PORT;
    private static final String SMTP_AUTH_USER = Info.SMTP_AUTH_USER;
    private static final String SMTP_AUTH_PWD  = Info.SMTP_AUTH_PWD;
    private static final String MAIL_TO  = Info.MAIL_TO;

    public static void main(String[] args) throws Exception{
       new SendWithAuth().test();
    }

    public void test() throws Exception{
        Properties props = new Properties();
        // property列表，见 https://javamail.java.net/nonav/docs/api/com/sun/mail/smtp/package-summary.html
        props.put("mail.transport.protocol", "smtp");
        props.put("mail.smtp.host", SMTP_HOST_NAME);
        props.put("mail.smtp.port", SMTP_PORT); // 默认是25端口，但是这个smtp服务器要求是587端口
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.starttls.enable", true); //  登录时需要启动TLS加密 (smtp服务器规定的)

        Authenticator auth = new SMTPAuthenticator();
        Session mailSession = Session.getDefaultInstance(props, auth);
        Transport transport = mailSession.getTransport();

        // header是在什么时候加的？比如Subject，from，to, cc等
        MimeMessage message = new MimeMessage(mailSession);
        message.setContent("send from java mail", "text/plain"); // 等价于message.setText
        message.setFrom(new InternetAddress(SMTP_AUTH_USER)); // Set From: header field of the header.
        message.addRecipient(Message.RecipientType.TO,
             new InternetAddress(MAIL_TO));  // Set To: header field of the header.
        message.setSubject("hi"); // Set Subject: header field， 可省略


        transport.connect();
        transport.sendMessage(message,
            message.getRecipients(Message.RecipientType.TO));
        transport.close();
    }

    private class SMTPAuthenticator extends javax.mail.Authenticator {
        public PasswordAuthentication getPasswordAuthentication() {
           String username = SMTP_AUTH_USER;
           String password = SMTP_AUTH_PWD;
           return new PasswordAuthentication(username, password);
        }
    }

}

自己写简易socket实现smtp邮件发送

telnet实现smtp邮件发送