Barcode zu PDF in Java hinzufügen – Signieren & Verifizieren mit GroupDocs

<dependency>
    <groupId>com.groupdocs</groupId>
    <artifactId>groupdocs-signature</artifactId>
    <version>23.12</version>
</dependency>

implementation 'com.groupdocs:groupdocs-signature:23.12'

import com.groupdocs.signature.Signature;

public class SignatureTest {
    public static void main(String[] args) {
        try {
            Signature signature = new Signature("test.pdf");
            System.out.println("GroupDocs.Signature initialized successfully!");
            signature.dispose();
        } catch (Exception e) {
            System.err.println("Setup issue: " + e.getMessage());
        }
    }
}

import com.groupdocs.signature.Signature;

Signature signature = new Signature("path/to/your/document.pdf");

try (Signature signature = new Signature("path/to/your/document.pdf")) {
    // Your signing operations here
} catch (Exception e) {
    System.err.println("Error working with document: " + e.getMessage());
}

String filePath = "YOUR_DOCUMENT_DIRECTORY/sample.docx";
String outputFilePath = "YOUR_OUTPUT_DIRECTORY/signed_sample.docx";

Signature signature = new Signature(filePath);

BarcodeSignOptions signOptions = new BarcodeSignOptions("John Smith", BarcodeTypes.Code128);
signOptions.setVerticalAlignment(VerticalAlignment.Top);
signOptions.setHorizontalAlignment(HorizontalAlignment.Center);
signOptions.setWidth(100);
signOptions.setHeight(40);
signOptions.setMargin(new java.awt.Rectangle(20, 20, 0, 0));
signOptions.setForeColor(Color.RED);

SignatureFont signatureFont = new SignatureFont();
signatureFont.setSize(12);
signatureFont.setFamilyName("Comic Sans MS");
signOptions.setFont(signatureFont);

signature.sign(outputFilePath, signOptions);

String invoiceId = "INV-2025-0042";
String approver = "john.smith@company.com";
String timestamp = LocalDateTime.now().toString();

// Combine into barcode data
String barcodeData = invoiceId + "|" + approver + "|" + timestamp;

BarcodeSignOptions signOptions = new BarcodeSignOptions(barcodeData, BarcodeTypes.QR);
signOptions.setVerticalAlignment(VerticalAlignment.Bottom);
signOptions.setHorizontalAlignment(HorizontalAlignment.Right);

signature.sign(outputFilePath, signOptions);

Signature signature = new Signature("YOUR_OUTPUT_DIRECTORY/signed_sample.docx");

BarcodeVerifyOptions verifyOptions = new BarcodeVerifyOptions();
verifyOptions.setAllPages(false); // Only check the first page
verifyOptions.setPageNumber(1);
verifyOptions.setEncodeType(BarcodeTypes.Code128);
verifyOptions.setText("John Smith");

boolean isValid = signature.verify(verifyOptions) != null;

if (isValid) {
    System.out.println("Document signature verified successfully!");
} else {
    System.out.println("Warning: Signature verification failed!");
}

BarcodeVerifyOptions flexibleOptions = new BarcodeVerifyOptions();
flexibleOptions.setAllPages(true);
flexibleOptions.setEncodeType(BarcodeTypes.Code128);
// No setText() call = accept any text with this barcode type

boolean hasAnySignature = signature.verify(flexibleOptions) != null;

BarcodeVerifyOptions formatOnly = new BarcodeVerifyOptions();
formatOnly.setEncodeType(BarcodeTypes.QR);
// Confirms a QR code exists, regardless of content

Signature signature = new Signature("YOUR_OUTPUT_DIRECTORY/signed_sample.docx");

BarcodeSearchOptions searchOptions = new BarcodeSearchOptions();
searchOptions.setAllPages(true); // Search the entire document

BarcodeSearchOptions narrowSearch = new BarcodeSearchOptions();
narrowSearch.setAllPages(false);
narrowSearch.setPageNumber(1); // Only search page 1
narrowSearch.setEncodeType(BarcodeTypes.Code128); // Only find Code128 barcodes

java.util.List<BarcodeSignature> signatures = signature.search(BarcodeSignature.class, searchOptions);

System.out.println("Found " + signatures.size() + " barcode signature(s)");

for (BarcodeSignature bcSignature : signatures) {
    System.out.println("Barcode Type: " + bcSignature.getEncodeType().getTypeName());
    System.out.println("Text: " + bcSignature.getText());
    System.out.println("Position: (" + bcSignature.getLeft() + ", " + bcSignature.getTop() + ")");
    System.out.println("Size: " + bcSignature.getWidth() + "x" + bcSignature.getHeight());
    System.out.println("---");
}

List<BarcodeSignature> foundSignatures = signature.search(BarcodeSignature.class, searchOptions);

for (BarcodeSignature sig : foundSignatures) {
    String barcodeData = sig.getText();
    
    // Parse your custom format (remember our invoice example?)
    String[] parts = barcodeData.split("\\|");
    if (parts.length == 3) {
        String invoiceId = parts[0];
        String approver = parts[1];
        String timestamp = parts[2];
        
        System.out.println("Invoice " + invoiceId + " approved by " + approver + " at " + timestamp);
    }
}

Signature signature = new Signature("YOUR_OUTPUT_DIRECTORY/signed_sample.docx");

BarcodeSearchOptions searchOptions = new BarcodeSearchOptions();
searchOptions.setAllPages(true);

List<BarcodeSignature> signatures = signature.search(BarcodeSignature.class, searchOptions);

List<BarcodeSignature> signaturesToUpdate = new ArrayList<>();

if (!signatures.isEmpty()) {
    BarcodeSignature bcSignature = signatures.get(0); // Update the first found signature
    
    // Move it 100px right and 100px down
    bcSignature.setLeft(bcSignature.getLeft() + 100);
    bcSignature.setTop(bcSignature.getTop() + 100);
    
    // Make it bigger
    bcSignature.setWidth(200);
    bcSignature.setHeight(50);
    
    signaturesToUpdate.add(bcSignature);
}

bcSignature.setLeft(50);
bcSignature.setTop(50);
bcSignature.setWidth(150);
bcSignature.setHeight(45);
// Note: You can't change the encoded text or barcode type with update
// For that, you'd need to delete and re-sign

ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
signature.update(outputStream, signaturesToUpdate);

// If you want to save to a file instead:
// signature.update("path/to/updated_document.docx", signaturesToUpdate);

List<BarcodeSignature> allSignatures = signature.search(BarcodeSignature.class, searchOptions);
List<BarcodeSignature> toUpdate = new ArrayList<>();

for (BarcodeSignature sig : allSignatures) {
    // Move all signatures down by 50px to clear space for new logo
    if (sig.getTop() < 100) {
        sig.setTop(sig.getTop() + 50);
        toUpdate.add(sig);
    }
}

if (!toUpdate.isEmpty()) {
    signature.update(outputStream, toUpdate);
    System.out.println("Repositioned " + toUpdate.size() + " signature(s)");
}

Signature signature = new Signature("YOUR_OUTPUT_DIRECTORY/signed_sample.docx");

BarcodeSearchOptions searchOptions = new BarcodeSearchOptions();
searchOptions.setAllPages(true);

List<BarcodeSignature> signatures = signature.search(BarcodeSignature.class, searchOptions);

List<BarcodeSignature> signaturesToDelete = new ArrayList<>();

// Delete all Code128 signatures (for example)
for (BarcodeSignature sig : signatures) {
    if (sig.getEncodeType().equals(BarcodeTypes.Code128)) {
        signaturesToDelete.add(sig);
    }
}

if (!signaturesToDelete.isEmpty()) {
    boolean result = signature.delete(signaturesToDelete);
    
    if (result) {
        System.out.println("Successfully deleted " + signaturesToDelete.size() + " signature(s)");
    } else {
        System.err.println("Failed to delete signatures");
    }
}

LocalDateTime cutoffDate = LocalDateTime.now().minusDays(30);
List<BarcodeSignature> outdatedSignatures = new ArrayList<>();

for (BarcodeSignature sig : signatures) {
    try {
        String text = sig.getText();
        // Assuming format like "data|timestamp"
        String[] parts = text.split("\\|");
        if (parts.length > 1) {
            LocalDateTime sigDate = LocalDateTime.parse(parts[1]);
            if (sigDate.isBefore(cutoffDate)) {
                outdatedSignatures.add(sig);
            }
        }
    } catch (Exception e) {
        // Skip signatures that don't match our format
        continue;
    }
}

if (!outdatedSignatures.isEmpty()) {
    signature.delete(outdatedSignatures);
    System.out.println("Removed " + outdatedSignatures.size() + " outdated signature(s)");
}

// Remove all signatures containing "TEST" in their text
List<BarcodeSignature> testSignatures = signatures.stream()
    .filter(sig -> sig.getText().toUpperCase().contains("TEST"))
    .collect(Collectors.toList());

if (!testSignatures.isEmpty()) {
    signature.delete(testSignatures);
    System.out.println("Cleaned up " + testSignatures.size() + " test signature(s)");
}

BarcodeSignOptions code128 = new BarcodeSignOptions("INV-2025-042", BarcodeTypes.Code128);

String jsonData = "{\"invoice\":\"INV-042\",\"amount\":1500.00,\"approver\":\"john@company.com\"}";
BarcodeSignOptions qrCode = new BarcodeSignOptions(jsonData, BarcodeTypes.QR);

// Always normalize your data
String signatureText = originalText.trim().toLowerCase();

// When signing:
BarcodeSignOptions signOptions = new BarcodeSignOptions(signatureText, BarcodeTypes.Code128);

// When verifying:
BarcodeVerifyOptions verifyOptions = new BarcodeVerifyOptions();
verifyOptions.setText(signatureText); // Use the same normalized text
verifyOptions.setEncodeType(BarcodeTypes.Code128);

// Increase size for longer strings
int dataLength = barcodeText.length();
int minWidth = Math.max(100, dataLength * 10); // 10px per character minimum

BarcodeSignOptions signOptions = new BarcodeSignOptions(barcodeText, BarcodeTypes.Code128);
signOptions.setWidth(minWidth);
signOptions.setHeight(60); // Taller = easier to scan

// Use high-contrast colors
signOptions.setForeColor(Color.BLACK); // Black on white is most reliable
signOptions.setBackColor(Color.WHITE);

// Process pages in batches instead of all at once
BarcodeSearchOptions searchOptions = new BarcodeSearchOptions();
searchOptions.setAllPages(false);

List<BarcodeSignature> allSignatures = new ArrayList<>();

for (int page = 1; page <= totalPages; page++) {
    searchOptions.setPageNumber(page);
    List<BarcodeSignature> pageSignatures = signature.search(BarcodeSignature.class, searchOptions);
    allSignatures.addAll(pageSignatures);
    
    // Process and clear as you go
    if (page % 10 == 0) {
        System.gc(); // Suggest garbage collection every 10 pages
    }
}

// Use relative positioning instead of absolute
signOptions.setVerticalAlignment(VerticalAlignment.Bottom);
signOptions.setHorizontalAlignment(HorizontalAlignment.Right);

// Then use margins for fine-tuning
Padding margin = new Padding();
margin.setRight(50); // 50px from right edge
margin.setBottom(50); // 50px from bottom
signOptions.setMargin(margin);

// This works consistently across PDF, DOCX, XLSX, etc.

// When updating, explicitly set all visual properties
bcSignature.setLeft(newLeft);
bcSignature.setTop(newTop);
bcSignature.setWidth(originalWidth); // Don't forget these!
bcSignature.setHeight(originalHeight);
// Note: Color and font can't be updated - you'd need to delete and re-sign

// Bad - Creates new instance each time
public void processDocument(String path) {
    Signature sig1 = new Signature(path);
    sig1.search(/* ... */);
    
    Signature sig2 = new Signature(path); // Unnecessary reload
    sig2.verify(/* ... */);
}

// Good - Reuse the same instance
public void processDocument(String path) {
    try (Signature signature = new Signature(path)) {
        signature.search(/* ... */);
        signature.verify(/* ... */);
        signature.update(/* ... */);
    }
}

// Slow for 100+ page documents
BarcodeSearchOptions slowSearch = new BarcodeSearchOptions();
slowSearch.setAllPages(true);

// Fast - only check where signatures actually are
BarcodeSearchOptions fastSearch = new BarcodeSearchOptions();
fastSearch.setAllPages(false);
fastSearch.setPageNumber(1); // Only check cover page

// Overkill for simple IDs
BarcodeSignOptions slow = new BarcodeSignOptions("12345", BarcodeTypes.QR);

// Faster and more appropriate
BarcodeSignOptions fast = new BarcodeSignOptions("12345", BarcodeTypes.Code128);

// Bad - exposes sensitive data
String barcodeData = "SSN:123-45-6789|Password:hunter2";

// Good - use reference IDs
String barcodeData = "USER-REF-7721X"; // Look up sensitive data server-side

// Client scans barcode and extracts "APPROVED-BY-ADMIN"
// Always verify server-side:
public boolean verifyApproval(String documentId, String scannedData) {
    // Load document from secure storage
    Signature signature = new Signature(getSecureDocument(documentId));
    
    BarcodeVerifyOptions verifyOptions = new BarcodeVerifyOptions();
    verifyOptions.setText(scannedData);
    
    boolean isValid = signature.verify(verifyOptions) != null;
    
    // Also check against your database
    boolean isInDatabase = checkApprovalDatabase(documentId, scannedData);
    
    return isValid && isInDatabase;
}

import java.time.LocalDateTime;
import java.time.temporal.ChronoUnit;

String timestamp = LocalDateTime.now().truncatedTo(ChronoUnit.SECONDS).toString();
String barcodeData = "APPROVAL|" + userId + "|" + timestamp;

// When verifying, check the timestamp isn't too old
public boolean isSignatureRecent(String barcodeData, int maxAgeHours) {
    String[] parts = barcodeData.split("\\|");
    if (parts.length < 3) return false;
    
    LocalDateTime signatureTime = LocalDateTime.parse(parts[2]);
    LocalDateTime now = LocalDateTime.now();
    
    long hoursSince = ChronoUnit.HOURS.between(signatureTime, now);
    return hoursSince <= maxAgeHours;
}

try (Signature signature = new Signature(documentPath)) {
    // Your operations here
    signature.sign(outputPath, signOptions);
} catch (Exception e) {
    logger.error("Failed to sign document: " + documentPath, e);
    throw new DocumentSigningException("Could not process document", e);
}

public void signDocument(String inputPath, String outputPath) {
    File inputFile = new File(inputPath);
    
    if (!inputFile.exists()) {
        throw new IllegalArgumentException("Input file not found: " + inputPath);
    }
    
    if (!inputFile.canRead()) {
        throw new SecurityException("Cannot read input file: " + inputPath);
    }
    
    File outputDir = new File(outputPath).getParentFile();
    if (outputDir != null && !outputDir.exists()) {
        outputDir.mkdirs();
    }
    
    try (Signature signature = new Signature(inputPath)) {
        signature.sign(outputPath, signOptions);
    }
}

import java.util.concurrent.locks.ReentrantLock;
import java.util.concurrent.ConcurrentHashMap;

public class SignatureManager {
    private final ConcurrentHashMap<String, ReentrantLock> documentLocks = new ConcurrentHashMap<>();
    
    public void signDocument(String documentPath, BarcodeSignOptions options) {
        ReentrantLock lock = documentLocks.computeIfAbsent(documentPath, k -> new ReentrantLock());
        
        lock.lock();
        try (Signature signature = new Signature(documentPath)) {
            signature.sign(documentPath + ".signed", options);
        } finally {
            lock.unlock();
        }
    }
}

import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.io.TempDir;
import static org.junit.jupiter.api.Assertions.*;

public class BarcodeSignatureTest {
    
    @TempDir
    Path tempDir;
    
    @Test
    public void testSignAndVerify() throws Exception {
        // Setup
        String testDoc = "test-document.pdf";
        String outputDoc = tempDir.resolve("signed-test.pdf").toString();
        String testData = "TEST-USER-12345";
        
        // Sign
        try (Signature signature = new Signature(testDoc)) {
            BarcodeSignOptions signOptions = new BarcodeSignOptions(testData, BarcodeTypes.Code128);
            signature.sign(outputDoc, signOptions);
        }
        
        // Verify
        try (Signature signature = new Signature(outputDoc)) {
            BarcodeVerifyOptions verifyOptions = new BarcodeVerifyOptions();
            verifyOptions.setText(testData);
            verifyOptions.setEncodeType(BarcodeTypes.Code128);
            
            boolean isValid = signature.verify(verifyOptions) != null;
            assertTrue(isValid, "Signature should be valid");
        }
    }
    
    @Test
    public void testSearchFindsSignature() throws Exception {
        String signedDoc = "signed-document.pdf";
        
        try (Signature signature = new Signature(signedDoc)) {
            BarcodeSearchOptions searchOptions = new BarcodeSearchOptions();
            searchOptions.setAllPages(true);
            
            List<BarcodeSignature> signatures = signature.search(BarcodeSignature.class, searchOptions);
            
            assertFalse(signatures.isEmpty(), "Should find at least one signature");
            assertEquals("TEST-USER-12345", signatures.get(0).getText());
        }
    }
}

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class DocumentSigningService {
    private static final Logger logger = LoggerFactory.getLogger(DocumentSigningService.class);
    
    public void signDocument(String docPath, String barcodeData) {
        logger.info("Starting signature process for document: {}", docPath);
        logger.debug("Barcode data length: {} characters", barcodeData.length());
        
        try (Signature signature = new Signature(docPath)) {
            BarcodeSignOptions options = new BarcodeSignOptions(barcodeData, BarcodeTypes.Code128);
            
            long startTime = System.currentTimeMillis();
            signature.sign(docPath + ".signed", options);
            long duration = System.currentTimeMillis() - startTime;
            
            logger.info("Successfully signed document in {}ms", duration);
        } catch (Exception e) {
            logger.error("Failed to sign document: {}", docPath, e);
            throw new RuntimeException("Signature operation failed", e);
        }
    }
}

// Track success/failure rates
metricsService.incrementCounter("signature.sign.success");
metricsService.incrementCounter("signature.verify.failure");

// Track performance
metricsService.recordTimer("signature.sign.duration", duration);

// Track document sizes
metricsService.recordHistogram("signature.document.pages", pageCount);

public void signBatch(List<String> documents, String barcodePrefix) {
    int total = documents.size();
    int completed = 0;
    int failed = 0;
    
    for (String docPath : documents) {
        try {
            String barcodeData = barcodePrefix + "-" + UUID.randomUUID().toString();
            signDocument(docPath, barcodeData);
            completed++;
            
            if (completed % 10 == 0) {
                logger.info("Progress: {}/{} documents signed", completed, total);
            }
        } catch (Exception e) {
            failed++;
            logger.warn("Failed to sign: {}", docPath, e);
        }
    }
    
    logger.info("Batch complete: {} succeeded, {} failed", completed, failed);
}

public class BarcodeConfig {
    private int defaultWidth = 100;
    private int defaultHeight = 40;
    private String defaultBarcodeType = "Code128";
    private String defaultColor = "BLACK";
    
    // Load from properties file or environment variables
    public BarcodeConfig() {
        this.defaultWidth = Integer.parseInt(
            System.getProperty("barcode.width", "100")
        );
        // ... load other properties
    }
    
    public BarcodeSignOptions createDefaultOptions(String text) {
        BarcodeSignOptions options = new BarcodeSignOptions(text, getBarcodeType());
        options.setWidth(defaultWidth);
        options.setHeight(defaultHeight);
        options.setForeColor(getColor());
        return options;
    }
}

public class BarcodeDataBuilder {
    private String userId;
    private String action;
    private LocalDateTime timestamp;
    private String documentId;
    
    public BarcodeDataBuilder setUserId(String userId) {
        this.userId = userId;
        return this;
    }
    
    public BarcodeDataBuilder setAction(String action) {
        this.action = action;
        return this;
    }
    
    public BarcodeDataBuilder setDocumentId(String documentId) {
        this.documentId = documentId;
        return this;
    }
    
    public String build() {
        this.timestamp = LocalDateTime.now();
        
        // Format: VERSION|USER|ACTION|DOC_ID|TIMESTAMP|CHECKSUM
        String data = String.join("|",
            "v1",
            userId,
            action,
            documentId,
            timestamp.toString()
        );
        
        // Add simple checksum
        int checksum = data.hashCode();
        return data + "|" + checksum;
    }
    
    public static ParsedBarcodeData parse(String barcodeData) {
        String[] parts = barcodeData.split("\\|");
        if (parts.length != 6 || !parts[0].equals("v1")) {
            throw new IllegalArgumentException("Invalid barcode format");
        }
        
        return new ParsedBarcodeData(parts[1], parts[2], parts[3], 
                                     LocalDateTime.parse(parts[4]));
    }
}

// Usage:
String barcodeData = new BarcodeDataBuilder()
    .setUserId("john.smith")
    .setAction("APPROVED")
    .setDocumentId("INV-2025-042")
    .build();

public BarcodeSignOptions getOptimalOptions(String documentPath, String text) {
    String extension = documentPath.substring(documentPath.lastIndexOf(".") + 1).toLowerCase();
    
    BarcodeSignOptions options = new BarcodeSignOptions(text, BarcodeTypes.Code128);
    
    switch (extension) {
        case "pdf":
            // PDFs can handle larger, detailed barcodes
            options.setWidth(150);
            options.setHeight(50);
            break;
        case "docx":
        case "doc":
            // Word docs need compact signatures that don't disrupt flow
            options.setWidth(100);
            options.setHeight(35);
            options.setVerticalAlignment(VerticalAlignment.Bottom);
            break;
        case "xlsx":
        case "xls":
            // Excel needs signatures that don't obscure data
            options.setWidth(80);
            options.setHeight(30);
            options.setHorizontalAlignment(HorizontalAlignment.Right);
            break;
        default:
            // Safe defaults
            options.setWidth(100);
            options.setHeight(40);
    }
    
    return options;
}