JavaMail認證/驗證
在前面的章節查詢電子郵件和讀取電子郵件，我們通過授權憑證（用戶名和密碼）以及主機，連接到您的郵箱中存儲時。相反，我們可以配置屬性有主機，並告訴您的自定義的Authenticator實例的會話。這示於下面的例子：
創建Java類
我們將修改CheckingMails.java 請先閱讀 章查詢電子郵件 這章。其內容如下所述：
package com.yiibai; import java.util.Properties; import javax.mail.Authenticator; import javax.mail.Folder; import javax.mail.Message; import javax.mail.MessagingException; import javax.mail.NoSuchProviderException; import javax.mail.PasswordAuthentication; import javax.mail.Session; import javax.mail.Store; public class CheckingMails { public static void check(String host, String storeType, String user, String password) { try { // create properties field Properties properties = new Properties(); properties.put("mail.pop3s.host", host); properties.put("mail.pop3s.port", "995"); properties.put("mail.pop3s.starttls.enable", "true"); // Setup authentication, get session Session emailSession = Session.getInstance(properties, new javax.mail.Authenticator() { protected PasswordAuthentication getPasswordAuthentication() { return new PasswordAuthentication( "manishapatil3may@gmail.com", "manisha123"); } }); // emailSession.setDebug(true); // create the POP3 store object and connect with the pop server Store store = emailSession.getStore("pop3s"); store.connect(); // create the folder object and open it Folder emailFolder = store.getFolder("INBOX"); emailFolder.open(Folder.READ_ONLY); // retrieve the messages from the folder in an array and print it Message[] messages = emailFolder.getMessages(); System.out.println("messages.length---" + messages.length); for (int i = 0, n = messages.length; i < n; i++) { Message message = messages[i]; System.out.println("---------------------------------"); System.out.println("Email Number " + (i + 1)); System.out.println("Subject: " + message.getSubject()); System.out.println("From: " + message.getFrom()[0]); System.out.println("Text: " + message.getContent().toString()); } // close the store and folder objects emailFolder.close(false); store.close(); } catch (NoSuchProviderException e) { e.printStackTrace(); } catch (MessagingException e) { e.printStackTrace(); } catch (Exception e) { e.printStackTrace(); } } public static void main(String[] args) { String host = "pop.gmail.com";// change accordingly String mailStoreType = "pop3"; String username = "abc@gmail.com";// change accordingly String password = "*****";// change accordingly check(host, mailStoreType, username, password); } }
您可以通過取消註釋語句上設置調試emailSession.setDebug(true);
編譯並運行
現在，我們班是準備好了，讓我們編譯上面的類。我已經保存了類CheckingMails.java目錄： /home/manisha/JavaMailAPIExercise. 我們需要 javax.mail.jar andactivation.jar 在classpath中。執行下面的命令從命令提示符編譯類（兩個罐子被放置在 /home/manisha/ 目錄下）：
javac -cp /home/manisha/activation.jar:/home/manisha/javax.mail.jar: CheckingMails.java
現在，這個類被編譯，執行下面的命令來運行：
java -cp /home/manisha/activation.jar:/home/manisha/javax.mail.jar: CheckingMails
驗證輸出
你可以看到一個類似的消息，如下命令控制檯上：
messages.length---3
Email Number 1
Subject: Today is a nice day
From: XYZ xyz@gmail.com
Text: javax.mail.internet.MimeMultipart@45f676cb
Email Number 2
Subject: hiiii....
From: XYZ xyz@gmail.com
Text: javax.mail.internet.MimeMultipart@37f12d4f
Email Number 3
Subject: helloo
From: XYZ xyz@gmail.com
Text: javax.mail.internet.MimeMultipart@3ad5ba3a