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src/pages/pdf/index.js

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+// src/App.js (Your 'pdfForm' page equivalent)
+import React, { useEffect, useRef, useState } from 'react';
+import './App.css'; // For basic styling
+import axios from 'axios';
+
+// Import your chosen commercial PDF SDK (e.g., PSPDFKit)
+import PSPDFKit from 'pspdfkit';
+
+function App() {
+    const viewerRef = useRef(null); // Ref for the DOM element where PDF will render
+    const instanceRef = useRef(null); // Ref for the PSPDFKit instance
+    const [pdfLoaded, setPdfLoaded] = useState(false);
+
+    useEffect(() => {
+        const loadPdfViewer = async () => {
+            if (viewerRef.current) {
+                try {
+                    // 1. Fetch the blank PDF template from your Spring Boot backend
+                    const response = await axios.get('http://localhost:8080/api/pdf/template', {
+                        responseType: 'arraybuffer' // Essential for binary data
+                    });
+                    const pdfBlob = new Blob([response.data], { type: 'application/pdf' });
+                    const pdfUrl = URL.createObjectURL(pdfBlob);
+
+                    // 2. Initialize the PDF SDK (e.g., PSPDFKit)
+                    const instance = await PSPDFKit.load({
+                        container: viewerRef.current,
+                        document: pdfUrl,
+                        // Remember to add your SDK license key if applicable
+                        // licenseKey: "YOUR_PSPDFKIT_LICENSE_KEY",
+                        baseUrl: process.env.PUBLIC_URL + '/pspdfkit-lib/', // Path to SDK assets
+                        // Enable form filling UI
+                        formDesignerViewMode: PSPDFKit.FormDesignerViewMode.Enabled
+                    });
+
+                    instanceRef.current = instance;
+                    setPdfLoaded(true);
+
+                    // 3. Clean up on component unmount
+                    return () => {
+                        if (instance) {
+                            instance.unload(); // Unload SDK instance
+                        }
+                        URL.revokeObjectURL(pdfUrl); // Revoke the Blob URL
+                    };
+
+                } catch (error) {
+                    console.error('Error loading PDF:', error);
+                }
+            }
+        };
+
+        loadPdfViewer();
+    }, []); // Empty dependency array means this runs once on mount
+
+    const handleSavePdf = async () => {
+        if (instanceRef.current) {
+            try {
+                // Export the filled PDF from the SDK as an ArrayBuffer
+                const arrayBuffer = await instanceRef.current.exportPDF();
+                const filledPdfBlob = new Blob([arrayBuffer], { type: 'application/pdf' });
+
+                // Create FormData to send the file to Spring Boot
+                const formData = new FormData();
+                formData.append('file', filledPdfBlob, 'filled_form.pdf');
+
+                // Send the filled PDF to your Spring Boot backend's save endpoint
+                const response = await axios.post('http://localhost:8080/api/pdf/saveFilled', formData, {
+                    headers: {
+                        'Content-Type': 'multipart/form-data' // Important for file uploads
+                    }
+                });
+                console.log('PDF saved on server:', response.data);
+                alert('PDF saved successfully on server!');
+            } catch (error) {
+                console.error('Error saving PDF:', error);
+                alert('Failed to save PDF.');
+            }
+        }
+    };
+
+    const handlePrintPdf = () => {
+        if (instanceRef.current) {
+            // Trigger the SDK's built-in print functionality
+            instanceRef.current.print();
+        }
+    };
+
+    return (
+        <div className="pdf-form-page"> {/* This is your 'pdfForm' page */}
+            <header className="page-header">
+                <h1>Fill and Manage Your PDF Form</h1>
+                {pdfLoaded ? (
+                    <div className="action-buttons">
+                        <button onClick={handleSavePdf} className="action-button save-button">
+                            Save Filled PDF
+                        </button>
+                        <button onClick={handlePrintPdf} className="action-button print-button">
+                            Print PDF
+                        </button>
+                    </div>
+                ) : (
+                    <p>Loading PDF viewer...</p>
+                )}
+            </header>
+            <div
+                ref={viewerRef}
+                className="pdf-viewer-container"
+                style={{
+                    width: '100%',
+                    height: 'calc(100vh - 180px)', // Adjust height based on header/footer
+                    border: '1px solid #ccc'
+                }}
+            >
+                {/* The PDF SDK will render the PDF viewer here */}
+            </div>
+        </div>
+    );
+}
+
+export default App;