Write simple email sending system with JavaMail [reproduced]

zhaozj2021-02-16 81

Write simple email sending system with JavaMail

Introduction Have you ever thought about using JSP to build a simple email release system? If you want, this article can complete your dreams. This article is an entry-level tutorial that will introduce some important features that use the HTML page used to collect email information, then introduce some of the important features of the JavaMail mail application interface, and finally use JSP to integrate into a mail publishing system. Once you have mastered the use of Javamail, it can become a powerful application interface for the JSP application. This article requires you to understand some of JSP, JavaBeans, and JavaMail's basic knowledge. I think you must now want to take them in the hottest, then see the relevant tutorials on JSP and Javabean on the day of the day. Of course, you can also see the relevant introductions on Sun's official website. JavaMail I will introduce below. If you are not very understanding of this knowledge, you can support JSP and JavaMail on your server, then copy the examples described in this article to your server's related directory. JavaMail is what JavaMail is an application interface of the SUN released by the e-mail, which presets some of the most commonly used mail transfer protocols, and provides a very easy way to call them. JavaMail is an application interface published by the Sun, so it is currently not included in JDK. So you need to download to the JavaMail class file from the official website of Sun. In addition, Sun's JAF (JavaBeans Activation Framework) is required, otherwise JavaMail will not run. Is it tired of being sweaty? Don't worry, this is the hardest part of the tutorial, and the rest is very simple. If you are confident that everything is installed, we can start.

One of the biggest features of HTML mail form JSP is to classify or divide a number of components, thereby improving the re-utilization of components, which also reduces the difficulty of programming. Therefore, we also think about how to divide a big problem into one module when programming: Module One HTML form, you can transfer email information to the JSP program module 2 Processing and send mail JSP page this article An HTML form will be provided to send information to the JSP page. Copy the following HTML source code to your host. Code 1: HTML source code for email

Recipient:	sender:
topic:
mail body: </ textarea> </ p> </ td> </ tr> </ Table> <input type = "submit" name = "cb_submit" value = "send"> <input type = "reset" name = "cb_reset" value = "rewrite"> </ form> </ body> </ html > This example only includes the most important information in e-mail, like "Received", "Servers", "Theme", and "Mail Text".</p> <p>The biggest advantage of your own mail system is to increase the information you need, such as "Cc", etc., completely according to your needs. This HTML document has two main needs to modify according to your requirements. First, the action (action) must be sent to the JSP utility to be described in the following lesson, you can also use the corresponding programs in your system instead of it. Second, modify the form that contains the fields that you want the user to send. JavaMail's basics use javamail is the components you need to send emails. JavaMail's agency makes it easy to process emails. Some of the classes we need are listed below: 1. Properties JavaMail Requires Properties to create a session object. It will look for strings "mail.smtp.host", the attribute value is the host that sends a message, such as Properties PROPS = New Properties (); Props.Put ("mail.smtp.host", "smtp.abcd.com" ); / / Can be replaced with your SMTP hostname. 2. Session This session class represents a message Session in JavaMail. Each JavaMail-based application has at least one session but can have any SESSION. In this example, the Session object needs to know the SMTP server used to process the mail. In order to do this, you can use the example below with Properties to create a session sension session sendmailsession; sendmailsession = session.getInstance (Props, NULL); 3. TRANSPORT mail can be sent or can be received. JavaMail uses two different classes to complete these two features: Transport and Store. Transport is used to send information, while the Store is used to receive. We only need to use Transport objects for this tutorial. Please see Sun's JavaMail documentation for the SUN. Usage: Transport Transport; Transport = Sendmailsession.getTransport ("SMTP"); initializes Transport with the GetTransport method of the JavaMail Session object. The passed string declares the protocols to be used by the object, such as "SMTP". This will save us a lot of time. Because Javamail has a lot of protocols in JavaMail. Note: JavaMail is not absolutely supporting each protocol, currently supporting IMAP, SMTP, and POP3. 4. The Message Message object stores the email information we actually sends, and the Message object is created as a mimeMessage object and needs to know which JavaMail Session should be selected. How to use: Message NewMessage = New MimeMail (SendmailSession); JavaMail combines JSP 1. Build a JSP program before we built an HTML form to send mail information, and introduce some of JavaMail some objects and methods in JavaMail. Now we will set these components to constitute our mail system. The first step is also the most important step, and it is sure that the required class is imported in the Page instruction. Don't forget to import Java.util.Date, because we need it to cover the email.</p> <p><% @ Page import = "javax.mail. , Javax.mail.internet. , Javax.activation. , Java.util. "%> Next, create a confirmation information sent out, such as "yours" Mail sent, return "II. Create and send Message objects to create a Message object. We can discuss in the third lesson, we can use Message to handle messages, just like GET and SET on the Message object The property is as simple as. This part uses a lot of request.getParameter (). newMessage.setFrom (new InternetAddress (request.getParameter ( "from"))); newMessage.setRecipient (Message.RecipientType.TO, new InternetAddress (request.getParameter ( "to"))); newMessage.setSubject (request.getParameter ( "Subject")); newMessage.setSentDate (New Date ()); newMessage.Settext ("text")); now you can finally send the message: Transport.send (newMessage); Third, complete The program is some zero fragmented code, and now we write them into a complete JSP program. 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