在 Java 應(yīng)用程序中使用 GMail、Yahoo 或 Hotmail 發(fā)送電子郵件

問(wèn)題：

Java 應(yīng)用程序可以使用電子郵件帳戶像 GMail、Yahoo 或 Hotmail 一樣發(fā)送電子郵件？如何實(shí)現(xiàn)這一點(diǎn)？

答案：

第 1 步：導(dǎo)入 JavaMail API

在繼續(xù)之前，請(qǐng)確保您已下載所需的 JavaMail API jar 并將其添加到您的

第 2 步：GMail 配置

以下 Java 代碼片段演示使用 GMail 帳戶發(fā)送電子郵件：

import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;

public class Main {

    private static String USER_NAME = "*****"; // GMail user name (before "@gmail.com")
    private static String PASSWORD = "********"; // GMail password
    private static String RECIPIENT = "[email protected]";

    public static void main(String[] args) {
        String from = USER_NAME;
        String pass = PASSWORD;
        String[] to = { RECIPIENT }; // List of recipient email addresses
        String subject = "Java send mail example";
        String body = "Welcome to JavaMail!";

        sendFromGMail(from, pass, to, subject, body);
    }

    private static void sendFromGMail(String from, String pass, String[] to, String subject, String body) {
        Properties props = System.getProperties();
        String host = "smtp.gmail.com";
        props.put("mail.smtp.starttls.enable", "true");
        props.put("mail.smtp.host", host);
        props.put("mail.smtp.user", from);
        props.put("mail.smtp.password", pass);
        props.put("mail.smtp.port", "587");
        props.put("mail.smtp.auth", "true");

        Session session = Session.getDefaultInstance(props);
        MimeMessage message = new MimeMessage(session);

        try {
            // Set email properties
            message.setFrom(new InternetAddress(from));

            // Create InternetAddress array for recipients
            InternetAddress[] toAddress = new InternetAddress[to.length];
            for (int i = 0; i < to.length; i++) {
                toAddress[i] = new InternetAddress(to[i]);
            }

            // Set recipients
            for (InternetAddress addr : toAddress) {
                message.addRecipient(Message.RecipientType.TO, addr);
            }

            // Set subject and body
            message.setSubject(subject);
            message.setText(body);

            // Establish connection and send email
            Transport transport = session.getTransport("smtp");
            transport.connect(host, from, pass);
            transport.sendMessage(message, message.getAllRecipients());
            transport.close();
        } catch (AddressException ae) {
            ae.printStackTrace();
        } catch (MessagingException me) {
            me.printStackTrace();
        }
    }
}

注意： 將 USER_NAME、PASSWORD、RECIPIENT、subject 和 body 變量替換為適當(dāng)?shù)?/p>

其他注意事項(xiàng)：

• 應(yīng)該在 catch 塊中實(shí)現(xiàn)正確的錯(cuò)誤處理。
• 您可能需要調(diào)整代碼對(duì)于不同的電子郵件提供商，通過(guò)更新服務(wù)器地址（主機(jī)）和端口（例如，對(duì)于雅虎：主機(jī)=“smtp.mail.yahoo.com”和端口=“587”）。

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