@RestController
public class PdfController {
    
    @GetMapping("/generate-pdf")
    public ResponseEntity<byte[]> generatePdf() throws IOException {
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        Document document = new Document();
        PdfWriter.getInstance(document, outputStream);
        
        document.open();
        document.add(new Paragraph("Hello, this is a PDF generated by REST API"));
        document.close();
        
        byte[] bytes = outputStream.toByteArray();
        
        return ResponseEntity.ok()
                .header(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=\"example.pdf\"")
                .contentType(MediaType.APPLICATION_PDF)
                .body(bytes);
    }
}

const express = require('express');
const PDFDocument = require('pdfkit');
const app = express();

app.get('/generate-pdf', (req, res) => {
    const doc = new PDFDocument();
    
    res.setHeader('Content-Type', 'application/pdf');
    res.setHeader('Content-Disposition', 'attachment; filename="example.pdf"');
    
    doc.pipe(res);
    doc.fontSize(25).text('Hello from PDFKit!', 100, 100);
    doc.end();
});

app.listen(3000);

@RestController
public class ExcelController {
    
    @GetMapping("/generate-excel")
    public ResponseEntity<byte[]> generateExcel() throws IOException {
        Workbook workbook = new XSSFWorkbook();
        Sheet sheet = workbook.createSheet("Sheet1");
        
        Row headerRow = sheet.createRow(0);
        headerRow.createCell(0).setCellValue("ID");
        headerRow.createCell(1).setCellValue("Name");
        
        Row dataRow = sheet.createRow(1);
        dataRow.createCell(0).setCellValue(1);
        dataRow.createCell(1).setCellValue("Example");
        
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        workbook.write(outputStream);
        workbook.close();
        
        byte[] bytes = outputStream.toByteArray();
        
        return ResponseEntity.ok()
                .header(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=\"example.xlsx\"")
                .contentType(MediaType.parseMediaType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"))
                .body(bytes);
    }
}

const express = require('express');
const ExcelJS = require('exceljs');
const app = express();

app.get('/generate-excel', async (req, res) => {
    const workbook = new ExcelJS.Workbook();
    const worksheet = workbook.addWorksheet('Sheet1');
    
    worksheet.columns = [
        { header: 'ID', key: 'id' },
        { header: 'Name', key: 'name' }
    ];
    
    worksheet.addRow({ id: 1, name: 'Example' });
    
    res.setHeader('Content-Type', 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
    res.setHeader('Content-Disposition', 'attachment; filename="example.xlsx"');
    
    await workbook.xlsx.write(res);
    res.end();
});

app.listen(3000);