请生成java代码 用springboot发邮件带pdf附件

在Spring Boot中发送包含PDF附件的电子邮件，你可以使用JavaMail API配合Spring的`SimpleMailMessage`和`JavaMailSender`。下面是一个简单的示例代码：

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.mail.SimpleMailMessage;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.stereotype.Service;

import javax.mail.internet.MimeMessage;
import java.io.File;
import java.util.Properties;

@Service
public class EmailService {

    @Autowired
    private JavaMailSender mailSender;

    public void sendEmailWithPdfAttachment(String to, String subject, String text, File pdfFile) throws Exception {
        SimpleMailMessage message = new SimpleMailMessage();
        message.setTo(to);
        message.setSubject(subject);
        message.setText(text);

        // 创建MimeMessage，添加附件
        MimeMessage mimeMessage = mailSender.createMimeMessage();
        Properties properties = mailSender.getJavaMailProperties();
        properties.put("mail.smtp.starttls.enable", "true");
        MimeMessageHelper helper = new MimeMessageHelper(mimeMessage, true); // 使用HTML邮件
        helper.addAttachment(pdfFile.getName(), pdfFile);
        
        // 发送邮件
        helper.send();
    }
}

在这个例子中，你需要确保已经配置了Spring Boot的邮箱设置（`application.properties`或`application.yml`），例如：

spring.mail.host=smtp.example.com
spring.mail.port=587
spring.mail.username=your-email@example.com
spring.mail.password=your-password
spring.mail.protocol=smtp

然后在需要的地方调用这个服务：

@Autowired
private EmailService emailService;

emailService.sendEmailWithPdfAttachment("recipient@example.com", "Subject with PDF Attachment", "This is a test email.", new File("/path/to/your/pdf/file.pdf"));