java - Open ResponseEntity PDF in new browser tab

Java - Open ResponseEntity PDF in new browser tab

To open a PDF file in a new browser tab using ResponseEntity in a Spring application, you typically need to set the appropriate headers and return the file content as a byte array. Here's a step-by-step guide on how to achieve this:

Step 1: Create a Controller Method

First, create a controller method that handles the request to download or view the PDF file. Here's an example:

import org.springframework.core.io.ByteArrayResource; import org.springframework.http.HttpHeaders; import org.springframework.http.MediaType; import org.springframework.http.ResponseEntity; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RestController; @RestController public class PDFController { @GetMapping("/view-pdf") public ResponseEntity<ByteArrayResource> viewPDF() { // Load PDF content from a file or any source byte[] pdfContent = getPdfContent(); // Replace with your PDF loading logic // Set headers HttpHeaders headers = new HttpHeaders(); headers.setContentType(MediaType.APPLICATION_PDF); headers.setContentLength(pdfContent.length); headers.set("Content-Disposition", "inline; filename=example.pdf"); // Return response entity return ResponseEntity .ok() .headers(headers) .body(new ByteArrayResource(pdfContent)); } // Example method to load PDF content (replace with your logic) private byte[] getPdfContent() { // Replace with logic to load PDF content // Example: Reading a file from resources // InputStream inputStream = getClass().getResourceAsStream("/example.pdf"); // return IOUtils.toByteArray(inputStream); return new byte[]{}; } }

Step 2: Explanation

  • @GetMapping("/view-pdf"): Defines the endpoint to handle GET requests for viewing the PDF.

  • ResponseEntity<ByteArrayResource>: Specifies that the method returns a response containing a byte array resource (which represents the PDF file content).

  • Headers Configuration:

    • headers.setContentType(MediaType.APPLICATION_PDF): Sets the Content-Type header to application/pdf to specify that the response contains PDF content.
    • headers.setContentLength(pdfContent.length): Sets the Content-Length header based on the length of the PDF content.
    • headers.set("Content-Disposition", "inline; filename=example.pdf"): Sets the Content-Disposition header to inline, indicating the browser should display the PDF in the browser tab. The filename parameter suggests the default filename for the downloaded file.

  • ResponseEntity.ok(): Returns a 200 OK status code along with the configured headers and body.

Step 3: Client-Side Handling

To open this endpoint in a new browser tab, you can use a simple anchor (<a>) tag with the target="_blank" attribute in your HTML or JavaScript:

<!DOCTYPE html> <html> <body> <a href="/view-pdf" target="_blank">View PDF</a> </body> </html>

Notes:

  • Security Considerations: Ensure that proper access controls and validation are implemented in your controller method, especially if the PDF content is sensitive or requires authentication.

  • PDF Loading Logic: Replace getPdfContent() with your actual logic to load the PDF content. This could involve reading from a file, generating dynamically, or retrieving from a database.

  • Dependencies: Ensure you have appropriate dependencies like Spring Web (spring-boot-starter-web) in your pom.xml or build.gradle.

This setup should allow you to serve a PDF file through Spring MVC and open it in a new browser tab using ResponseEntity. Adjust the endpoint path (/view-pdf) and filename (example.pdf) as needed for your application.

Examples

  1. How to open a PDF in a new browser tab using ResponseEntity in Spring MVC?

    @GetMapping("/open-pdf") public ResponseEntity<byte[]> openPDFInNewTab() throws IOException { HttpHeaders headers = new HttpHeaders(); headers.setContentType(MediaType.APPLICATION_PDF); headers.setContentDispositionFormData("inline", "example.pdf"); InputStream inputStream = getClass().getResourceAsStream("/path/to/example.pdf"); byte[] bytes = IOUtils.toByteArray(inputStream); return new ResponseEntity<>(bytes, headers, HttpStatus.OK); }

    Description: Returns a ResponseEntity with PDF content and headers set to open in the browser tab using Content-Disposition: inline.

  2. Java Spring Boot: How to display PDF in new tab from ResponseEntity with Content-Disposition?

    @GetMapping("/view-pdf") public ResponseEntity<Resource> viewPDFInNewTab() throws IOException { Resource pdfFile = new InputStreamResource(getClass().getResourceAsStream("/path/to/example.pdf")); HttpHeaders headers = new HttpHeaders(); headers.setContentType(MediaType.APPLICATION_PDF); headers.setContentDisposition(ContentDisposition.builder("inline").filename("example.pdf").build()); return ResponseEntity.ok() .headers(headers) .body(pdfFile); }

    Description: Uses Resource to return the PDF file and sets headers with Content-Disposition to open the PDF in a new browser tab.

  3. How to open PDF file in new tab using ResponseEntity and HttpHeaders in Spring MVC?

    @GetMapping("/show-pdf") public ResponseEntity<byte[]> showPDFInNewTab() throws IOException { HttpHeaders headers = new HttpHeaders(); headers.setContentType(MediaType.APPLICATION_PDF); headers.setContentDispositionFormData("inline", "example.pdf"); Path pdfPath = Paths.get("/path/to/example.pdf"); byte[] pdfBytes = Files.readAllBytes(pdfPath); return ResponseEntity.ok() .headers(headers) .body(pdfBytes); }

    Description: Reads the PDF file as bytes and returns ResponseEntity with headers set to open the PDF in a new tab (Content-Disposition: inline).

  4. Java: Open PDF in new browser tab using ResponseEntity with InputStreamResource?

    @GetMapping("/display-pdf") public ResponseEntity<InputStreamResource> displayPDFInNewTab() throws IOException { InputStream inputStream = getClass().getResourceAsStream("/path/to/example.pdf"); InputStreamResource resource = new InputStreamResource(inputStream); HttpHeaders headers = new HttpHeaders(); headers.setContentType(MediaType.APPLICATION_PDF); headers.setContentDispositionFormData("inline", "example.pdf"); return new ResponseEntity<>(resource, headers, HttpStatus.OK); }

    Description: Returns an InputStreamResource containing the PDF content with headers set to open in a new browser tab.

  5. Java Spring: How to serve PDF file in new tab using ResponseEntity and InputStream?

    @GetMapping("/serve-pdf") public ResponseEntity<byte[]> servePDFInNewTab() throws IOException { InputStream inputStream = getClass().getResourceAsStream("/path/to/example.pdf"); byte[] bytes = IOUtils.toByteArray(inputStream); HttpHeaders headers = new HttpHeaders(); headers.setContentType(MediaType.APPLICATION_PDF); headers.setContentDispositionFormData("inline", "example.pdf"); return new ResponseEntity<>(bytes, headers, HttpStatus.OK); }

    Description: Uses IOUtils.toByteArray() to convert InputStream to byte array and returns ResponseEntity to serve the PDF with Content-Disposition: inline.

  6. Spring MVC: Open PDF in new tab using ResponseEntity with FileSystemResource?

    @GetMapping("/load-pdf") public ResponseEntity<FileSystemResource> loadPDFInNewTab() { FileSystemResource pdfFile = new FileSystemResource(new File("/path/to/example.pdf")); HttpHeaders headers = new HttpHeaders(); headers.setContentType(MediaType.APPLICATION_PDF); headers.setContentDisposition(ContentDisposition.builder("inline").filename("example.pdf").build()); return ResponseEntity.ok() .headers(headers) .body(pdfFile); }

    Description: Returns a FileSystemResource containing the PDF file with headers set to open in a new browser tab.

  7. Java: Serve PDF file in new tab using ResponseEntity and StreamResource in Spring Boot?

    @GetMapping("/serve-stream-pdf") public ResponseEntity<InputStreamResource> serveStreamPDFInNewTab() throws IOException { InputStream inputStream = getClass().getResourceAsStream("/path/to/example.pdf"); HttpHeaders headers = new HttpHeaders(); headers.setContentType(MediaType.APPLICATION_PDF); headers.setContentDispositionFormData("inline", "example.pdf"); return ResponseEntity.ok() .headers(headers) .body(new InputStreamResource(inputStream)); }

    Description: Uses InputStreamResource to serve the PDF file content and sets headers to open in a new browser tab.

  8. Spring MVC: Display PDF file in new tab using ResponseEntity and ByteArrayResource?

    @GetMapping("/display-pdf-bytes") public ResponseEntity<ByteArrayResource> displayPDFBytesInNewTab() throws IOException { Path pdfPath = Paths.get("/path/to/example.pdf"); byte[] pdfBytes = Files.readAllBytes(pdfPath); ByteArrayResource resource = new ByteArrayResource(pdfBytes); HttpHeaders headers = new HttpHeaders(); headers.setContentType(MediaType.APPLICATION_PDF); headers.setContentDisposition(ContentDisposition.builder("inline").filename("example.pdf").build()); return ResponseEntity.ok() .headers(headers) .body(resource); }

    Description: Reads PDF file bytes into a ByteArrayResource and returns ResponseEntity with headers for displaying in a new browser tab.

  9. How to open PDF file in new tab with ResponseEntity and ByteArrayResource in Spring Boot?

    @GetMapping("/open-pdf-bytes") public ResponseEntity<byte[]> openPDFBytesInNewTab() throws IOException { Path pdfPath = Paths.get("/path/to/example.pdf"); byte[] pdfBytes = Files.readAllBytes(pdfPath); HttpHeaders headers = new HttpHeaders(); headers.setContentType(MediaType.APPLICATION_PDF); headers.setContentDispositionFormData("inline", "example.pdf"); return ResponseEntity.ok() .headers(headers) .body(pdfBytes); }

    Description: Reads PDF file bytes into a byte array and returns ResponseEntity with headers set to open the PDF in a new tab.

  10. Java Spring Boot: Serve PDF file in new tab using ResponseEntity and ResourceLoader?

    @Autowired private ResourceLoader resourceLoader; @GetMapping("/serve-pdf-loader") public ResponseEntity<Resource> servePDFUsingLoader() throws IOException { Resource pdfFile = resourceLoader.getResource("classpath:/path/to/example.pdf"); HttpHeaders headers = new HttpHeaders(); headers.setContentType(MediaType.APPLICATION_PDF); headers.setContentDisposition(ContentDisposition.builder("inline").filename("example.pdf").build()); return ResponseEntity.ok() .headers(headers) .body(pdfFile); }

    Description: Uses ResourceLoader to load the PDF file and returns ResponseEntity with headers to open in a new browser tab.

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