Email and pdf generation integration

Greenhorn

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posted 2 years ago

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This is a spring boot project making use of the Thymeleaf template engine. I have a project where I can send mail to the hardcoded mail id. The problem is with the pdf generation using Thymeleaf. I am able to create a pdf but it is getting stored in the boot and not in any external folder. I wanted to send the generated pdf along with the mail when I run the program. I have made use of flying saucer for the pdf and below is my code. The problem I am facing is that I am not able to integrate blank generated pdf into the mail sent. Could really use some help with this.

Entity Class:

EmailService Class:

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.io.FileSystemResource;
import org.springframework.mail.SimpleMailMessage;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.MimeMessageHelper;
import org.springframework.stereotype.Service;
import org.thymeleaf.spring5.SpringTemplateEngine;

import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;
import java.io.File;

@Service
public class EmailService {
    @Autowired
    private JavaMailSender emailSender;

@Autowired
    private SpringTemplateEngine templateEngine;

@Autowired
    private PdfService pdfService;

public void sendSimpleEmail(String toEmail,
                                String body,
                                String subject) {
        SimpleMailMessage message = new SimpleMailMessage();

message.setFrom("mailId@gmail.com");
        message.setTo(toEmail);
        message.setText(body);
        message.setSubject(subject);

emailSender.send(message);
        System.out.println("Mail Send...");
    }

public void sendEmailWithAttachment(String toEmail,
                                        String body,
                                        String subject,
                                        String attachment) throws MessagingException {

MimeMessage mimeMessage = emailSender.createMimeMessage();
        MimeMessageHelper mimeMessageHelper
                = new MimeMessageHelper(mimeMessage, true);
        mimeMessageHelper.setFrom("spring.email.from@gmail.com");
        mimeMessageHelper.setTo(toEmail);
        mimeMessageHelper.setText(body);
        mimeMessageHelper.setSubject(subject);
        FileSystemResource fileSystem
                = new FileSystemResource(new File(attachment));
        mimeMessageHelper.addAttachment(fileSystem.getFilename(),
                fileSystem);

emailSender.send(mimeMessage);
        System.out.println("Mail Send...");

}
}

PdfService Class:

import com.itextpdf.text.DocumentException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.stereotype.Service;
import org.thymeleaf.TemplateEngine;
import org.thymeleaf.context.Context;
import org.xhtmlrenderer.pdf.ITextRenderer;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

@Service
public class PdfService {
    @Autowired
    private TemplateEngine templateEngine;

@Autowired
    private JavaMailSender sender;
    
    public void createPdf() throws IOException, DocumentException {
        Context context = new Context();
        context.setVariable("name","whatsup!");
        String processHtml = templateEngine.process("hello",context);
        OutputStream outputStream = new FileOutputStream("message.pdf");
        ITextRenderer renderer = new ITextRenderer();
        renderer.setDocumentFromString(processHtml);
        renderer.layout();
        renderer.createPDF(outputStream,false);
        renderer.finishPDF();
        outputStream.close();
    }
}

Thymeleaf Configuration Class:

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.thymeleaf.spring5.SpringTemplateEngine;
import org.thymeleaf.spring5.templateresolver.SpringResourceTemplateResolver;
import org.thymeleaf.templatemode.TemplateMode;
import org.thymeleaf.templateresolver.ClassLoaderTemplateResolver;

import java.nio.charset.StandardCharsets;

@Configuration
public class ThymeleafConfig {
    @Bean
    public SpringTemplateEngine springTemplateEngine() {
        SpringTemplateEngine templateEngine = new SpringTemplateEngine();
        templateEngine.addTemplateResolver(htmlTemplateResolver());
        return templateEngine;
    }

@Bean
    public ClassLoaderTemplateResolver templateResolver(){
        ClassLoaderTemplateResolver templateResolver = new ClassLoaderTemplateResolver();
        templateResolver.setPrefix("templates/");
        templateResolver.setTemplateMode("HTML5");
        templateResolver.setSuffix(".html");
        templateResolver.setTemplateMode("XHTML");
        templateResolver.setCharacterEncoding("UTF-8");
        return templateResolver;
    }
    @Bean
    public SpringResourceTemplateResolver htmlTemplateResolver(){
        SpringResourceTemplateResolver emailTemplateResolver = new SpringResourceTemplateResolver();
        emailTemplateResolver.setPrefix("classpath:/templates/");
        emailTemplateResolver.setSuffix(".html");
        emailTemplateResolver.setTemplateMode(TemplateMode.HTML);
        emailTemplateResolver.setCharacterEncoding(StandardCharsets.UTF_8.name());
        return emailTemplateResolver;
    }
}

Main Class:

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.context.event.ApplicationReadyEvent;
import org.springframework.context.event.EventListener;
import javax.mail.MessagingException;

@SpringBootApplication
public class FlyingsaucerApplication implements CommandLineRunner {
	String filepath="C:\\xxxx\\xxxx\\xxxx\\xxxxx\\folder_name\\sample1.pdf";//filepath

@Autowired
	private PdfService pdfService;
	@Autowired
	EmailService emailService;

public static void main(String[] args) {
		SpringApplication.run(FlyingsaucerApplication.class, args);
	}

@Override
	public void run(String... args) throws Exception {
		System.out.println("Creating PDF");
		pdfService.createPdf();
		System.out.println("pdf creation done");

}

@EventListener(ApplicationReadyEvent.class)
	public void triggerMail() throws MessagingException {
		emailService.sendEmailWithAttachment("mailId@gmail.com",
				"This is Email Body with Attachment...",
				"This email has attachment", filepath);

}
}

Html Template FIle:

Himai Minh

Bartender

Posts: 2436

posted 2 years ago

1
Number of slices to send:

Optional 'thank-you' note:

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Do you find these posts and article helpful:
https://stackoverflow.com/questions/40708272/springboot-application-startup-failed-due-to-autowire-javamailsender-version-2

https://mkyong.com/spring-boot/spring-boot-how-to-send-email-via-smtp/

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