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Timer 与 DelayQueue

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 简介有这样一个业务场景，很多业务需要发邮件，如果失败了要重试，每隔5分钟重试一次，最多12次，如果是12次都失败，就记入数据库。粗一想，很简单嘛，但是仔细想一想，好像不是那么容易，在想一想，嗯，也不是那么难。还是要亲自试一下，写一下代码才知道有哪些坑。分析其实，问题的关键在于时间间隔的处理，是使用定时器，还是队列把时间封装一下。注意，很容易把这2中情况混在一起了。下面就来把这两种情况都实现一下。 Timer实现很多对线程池比较熟悉的朋友可能首先想到的是ScheduledThreadPoolExecutor，但是ScheduledThreadPoolExecutor有一个问题就是没有办法取消。比如发送到第5次成功了，就需要取消周期任务，避免重复发送，ScheduledThreadPoolExecutor是不好实现的。所以我们直接使用Timer和TimerTask。先来一个TimerTask import java.util.TimerTask; public class MailSendTimerTask extends TimerTask { private int exeNum; private String name; public MailSendTimerTask(String

应用部署优化方案分享

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 转载本文需注明出处：微信公众号EAWorld，违者必究。引言：在企业级应用实施和运营过程中，为了解决企业中部分业务场景访问量大、并发量高的问题，就需要对系统架构及应用参数做出优化和调整，如架构优化、数据库优化、应用优化等。应用系统部署优化是一个不断尝试、实践、总结的过程，并针对不同企业的特点制定相关解决方案。通过应用系统架构、数据库及应用优化入手，并通过相关案例加以说明和解释。目录： 1、应用系统架构简介 2、数据库及应用优化方案 3、优化案例分析 1. 应用系统架构简介应用系统架构的发展当今互联网技术发展日新月异，应用系统架构也在不断的更新迭代，从传统的单一架构演变为如今的集群架构、分布式、微服务架构等，以便满足用户对系统的要求。 NO1.单机部署架构互联网建设初期，用户访问量有限，数据量不大，多数系统采用单台服务器部署应用服务，系统服务、文件、数据库等所有系统资源部署在一台服务器上. NO2.应用和数据分离随着用户量和数据量的不断攀升，业务对系统的性能要求越来越高，这是需要将应用和数据分离，单独部署相关的业务组件。 NO3.引入NoSQL数据库架构随着用户不断的增加，关系型数据库压力变大，访问延迟，性能下降，这时加入缓存技术，将查询较多数据缓存起来，以加快应用访问速度。 NO4

60秒一口Python：147个demo，助你从新手小白步步进阶编程高手

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 人生苦短，编程苦手，不妨学起Python，感受一飞冲天的快乐。不要害怕学习的过程枯燥无味，这里有程序员jackzhenguo打造的一份中文Python“糖果包”：147个代码小样，60秒一口，营养又好玩，从Python基础到机器学习尽皆囊括。入门简单如十进制转二进制，尽显Python简洁之美： In[1]:bin(10)Out[1]:'0b1010' 冬天到了，就算没有点亮手绘技能，也能用简单几行代码绘出漫天雪花：例子是有趣的例子，教程也是正经教程，学习路径清晰、系统，先一起来看看完整目录：学习路径施工完成： 1、Python基础 2、Python字符串和正则化 3、Python文件 4、Python日期 5、Python利器 6、Python画图 7、Python实战施工中： Python基础算法 python 机器学习，包括机器学习的基础概念和十大核心算法以及Sklearn和Kaggle实战的小例子 PyQt制作GUI Flask前端开发 Python数据分析：NumPy, Pandas, Matplotlib, Plotly等教程开篇，先用 82 段简单易懂的代码，介绍了Python的基础语法、功能。由简入繁，层层递进。掌握了基础概念，就可以开始进一步深入学习了。比如字符串的处理。其中

Configuring LAMP to Send Mails

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问题 I have LAMP stack installed on VPS. Would like to send mails using PHP's internal mail() function. I have an account with Fastmail, and have credentials for their SMTP Server. So would like to use that for mailing purposes instead of setting one of my own. Additionally, there should be a way to throttle/queue the mails. Can someone guide me to the direction to where should I start? EDIT: I am on Ubuntu on Linode. NOTE: This is not for spamming. Its meant for my side project. 回答1: Use Php

send email to localhost from localhost via python

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问题 I'm building and testing a web service on my local machine before i put it in production. I want to test the mail service. I'm using the standard python email and smtplib libraries. import smtplib from email.mime.text import MIMEText fp = open('textfile', 'rb') msg = MIMEText(fp.read()) fp.close() me = 'me_email@localhost' you = 'me_again_email@localhost' msg['Subject'] = 'The contents of %s' %fp msg['From'] = me msg['To'] = you s = smtplib.SMTP('localhost') s.sendmail(me, [you], msg.as

send email to localhost from localhost via python

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How to Send Mail and access Inbox through STMP/POP Connection in BlackBerry?

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问题 I need to access Inbox or Sent item or Send Mail in Blackberry using STMP/POP Connection ? and Is it possible to Configure Email in Blackberry device Programitically ? 来源： https://stackoverflow.com/questions/13775665/how-to-send-mail-and-access-inbox-through-stmp-pop-connection-in-blackberry

Failure sending Mail in asp.net mvc4 smtp.Send(mail)

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问题 I find out number of posts regarding to this Issue in stackoverflow, But Still my problem was not solved. I tried to send a mail using the below code: In Controller: try { MailMessage mail = new MailMessage(); mail.To.Add("mailto@gmail.com"); mail.From = new MailAddress("mailfrom@gmail.com"); mail.Subject = "Feedback for Website"; string Body = "Name:"; mail.Body = Body; mail.IsBodyHtml = true; SmtpClient smtp = new SmtpClient(); smtp.Host = "smtp.gmail.com"; smtp.EnableSsl = true; smtp

Print array in sendmail

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问题 I am trying to echo an array in sendmail's message body. I created a function to print a POST array: function printArray($array, $pad=''){ foreach (array_slice($array, 3) as $key => $value){ echo $pad . "$key: $value <br>"; if(is_array($value)){ printArray($value, $pad.' '); } } } It prints perfectly both through print_r printArray($_POST); and if put in a variable $Parray = printArray($_POST); echo $Parray; But I am not getting it work in sendmail message: $message = printArray($_POST); mail

tkinter text widget as html

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问题 I had built tkinter app for sending email. The body of email should get the text with formatting/style from the text widget. Is there any method for doing the same. get method is only given the text but not the style/formatting. 回答1: The text widget has a method named dump which can serialize everything in the text widget. It returns a list of tuples. Each tuple will be of the form (key, value, index). key will be one of the following: text , mark , tagon , tagoff , image , or window . The

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