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                # 如何使用SMTP發郵件? 應用中發送郵件是一個很常見的功能。經過大量用戶實踐反饋,只推薦一種發郵件的方式,即安裝郵件插調用第三方郵件系統的STMP相關賬號來進行郵件發送。 不同于LAMP下發送郵件,Windows下,SMTP發送郵件前,需要以下5個步驟: 1. 下載 [javax.mail.jar](https://download.csdn.net/download/u010182075/7145569)包到 *C:\wwwroot\www.example.com/WEB-INF/lib/* 示例目錄下 >注意:上傳前,如果*C:\wwwroot\www.example.com* 目錄下存在其他文件,請將其清空后再上傳 2. 新建一個以.jsp后綴的文件,假設命名為“index.jsp”,將其放到與 */WEB-INF* 目錄同級上 3. 拷貝下面的配置文件模板到index.jsp文件中,并保存 ``` <%@ page import="java.util.*" %> <%@ page import="javax.mail.*" %> <%@ page import="javax.mail.internet.*" %> <%@ page import="javax.activation.*" %> <% String result; // 收信方Email String to = "***********@qq.com"; String from = "norelpy@smtp.websoft9.cn"; String psd = "WebSoft23221"; String user = "norelpy@smtp.websoft9.cn"; Properties properties = new Properties(); try { properties.setProperty( "mail.smtp.auth", "true" ); properties.setProperty( "mail.transport.protocol", "smtp" ); properties.setProperty( "mail.smtp.host", "smtpdm.aliyun.com" ); // SSL properties.setProperty("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory"); properties.setProperty("mail.smtp.socketFactory.fallback", "false"); properties.setProperty("mail.smtp.socketFactory.port", "465"); properties.setProperty("mail.smtp.port", "465"); Session mailSession = Session.getDefaultInstance( properties ); Message message = new MimeMessage( mailSession ); Transport transport = mailSession.getTransport(); message.setFrom( new InternetAddress( from ) ); message.addRecipient( Message.RecipientType.TO, new InternetAddress( to ) ); message.setSubject( "This is the Subject Line!" ); BodyPart messageBodyPart = new MimeBodyPart(); //郵件信息內容 messageBodyPart.setText("This is message body"); Multipart multipart = new MimeMultipart(); multipart.addBodyPart(messageBodyPart); message.setContent(multipart); message.setSentDate(new Date()); transport.connect(user,psd); transport.sendMessage( message, message.getAllRecipients() ); result = "Sent message successfully...."; } catch (Exception e) { e.printStackTrace(); result = "Error: unable to send message...."; } %> <html> <head> <title>Send Email using JSP</title> </head> <body> <center> <h1>Send Email using JSP</h1> </center> <p align="center"> <% out.println("Result: " + result + "\n"); %> </p> </body> </html> ``` 4. 重啟Tomcat。桌面雙擊Tomcat,單擊`General->stop->start`即可 5. 本地瀏覽器訪問:http://服務器公網IP, 如果網頁上出現 `Send Email using JSP Result: Sent message successfully.... ` 這樣的反饋信息說明郵件發送成功 ## SMTP測試失敗 如果使用第三方提供的SMTP服務(如qq郵箱、網易郵箱等),配置也沒有問題,但是仍然無法發送郵件。請檢查如下兩個問題: 1. win+R,輸入cmd,驗證是否可以連接SMTP,命令如下 ~~~ //測試qq郵箱 端口有465和587 telnet smtp.qq.com 465 //測試網易郵箱 端口有465和994 telnet smtp.163.com 465 ~~~ 如果沒有出現 `正在連接smtp....` 這樣的反饋信息說明可以連接
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