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How to Return PDF Files from a Micronaut Endpoint
- Micronaut is a JVM-based framework for building microservices, and returning a PDF from a REST API endpoint is a common need in business applications.
- Micronaut uses compile-time annotation processing, reducing memory usage and startup time compared to traditional Java frameworks like Spring.
- Key features of Micronaut include compile-time dependency injection, fast startup time, integration with GraalVM, reactive support, built-in HTTP server/client, and cloud-native readiness.
- To return a PDF in Micronaut, dependencies like micronaut-http-server-netty and OpenPDF library need to be added to the project.
- A PdfService class is used to generate the PDF content in memory using OpenPDF library, and a PdfController class handles the REST endpoint for returning the PDF.
- The PdfController method calls pdfService.generatePdf() to get the PDF content as a byte array and constructs an HTTP response with the PDF content, content type, and download header.
- By structuring the PDF generation logic in a service class, the codebase becomes cleaner and more maintainable in Micronaut applications.
- Using OpenPDF for PDF generation in Micronaut allows for working with an open-source and LGPL-licensed library suitable for various commercial applications.
- This approach provides a foundation for building advanced PDF workflows with tables, images, dynamic data, and charts in Micronaut-based applications.
- The integration of OpenPDF for PDF generation and delivery in Micronaut allows for streamlined and efficient handling of PDF content.
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