Java中如何发送邮件 掌握JavaMail API的使用

<dependency>
    <groupId>com.sun.mail</groupId>
    <artifactId>javax.mail</artifactId>
    <version>1.6.2</version>
</dependency>

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

public class EmailSender {

    public static void main(String[] args) {
        // 1. 配置邮件服务器信息
        String host = "smtp.example.com"; // 你的SMTP服务器地址
        String username = "your_email@example.com"; // 你的邮箱地址
        String password = "your_password"; // 你的邮箱密码

        // 2. 创建Session对象
        Properties properties = new Properties();
        properties.put("mail.smtp.host", host);
        properties.put("mail.smtp.port", "587"); // 或 465，取决于你的服务器配置
        properties.put("mail.smtp.auth", "true");
        properties.put("mail.smtp.starttls.enable", "true"); // 启用TLS加密

        Session session = Session.getInstance(properties, new Authenticator() {
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(username, password);
            }
        });

        try {
            // 3. 构建Message对象
            Message message = new MimeMessage(session);
            message.setFrom(new InternetAddress(username));
            message.setRecipients(Message.RecipientType.TO, InternetAddress.parse("recipient@example.com")); // 收件人地址
            message.setSubject("JavaMail测试邮件");
            message.setText("这是一封使用JavaMail发送的测试邮件。");

            // 4. 发送邮件
            Transport.send(message);

            System.out.println("邮件发送成功！");

        } catch (MessagingException e) {
            e.printStackTrace();
        }
    }
}

import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.FileDataSource;
import javax.mail.*;
import javax.mail.internet.*;
import java.util.Properties;

public class EmailWithAttachmentSender {

    public static void main(String[] args) {
        // 1. 配置邮件服务器信息 (与前面的例子相同)
        String host = "smtp.example.com";
        String username = "your_email@example.com";
        String password = "your_password";

        // 2. 创建Session对象 (与前面的例子相同)
        Properties properties = new Properties();
        properties.put("mail.smtp.host", host);
        properties.put("mail.smtp.port", "587");
        properties.put("mail.smtp.auth", "true");
        properties.put("mail.smtp.starttls.enable", "true");

        Session session = Session.getInstance(properties, new Authenticator() {
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(username, password);
            }
        });

        try {
            // 3. 构建Message对象
            Message message = new MimeMessage(session);
            message.setFrom(new InternetAddress(username));
            message.setRecipients(Message.RecipientType.TO, InternetAddress.parse("recipient@example.com"));
            message.setSubject("JavaMail带附件测试邮件");

            // 创建 MimeBodyPart 对象，用于存放邮件内容和附件
            MimeBodyPart messageBodyPart = new MimeBodyPart();

            // 设置邮件文本内容
            messageBodyPart.setText("这是一封带附件的测试邮件。\n请查收附件。");

            // 创建 MimeMultipart 对象，用于存放多个 MimeBodyPart 对象
            Multipart multipart = new MimeMultipart();
            multipart.addBodyPart(messageBodyPart);

            // 添加附件
            String filename = "path/to/your/attachment.txt"; // 附件路径
            DataSource source = new FileDataSource(filename);
            messageBodyPart = new MimeBodyPart();
            messageBodyPart.setDataHandler(new DataHandler(source));
            messageBodyPart.setFileName(filename); // 设置附件名称
            multipart.addBodyPart(messageBodyPart);

            // 将 MimeMultipart 对象设置为邮件内容
            message.setContent(multipart);

            // 4. 发送邮件
            Transport.send(message);

            System.out.println("带附件邮件发送成功！");

        } catch (MessagingException e) {
            e.printStackTrace();
        }
    }
}