从增删改查到加密保护详解Java编辑PDF的完整指南

<repositories>
    <repository>
        <id>com.e-iceblue</id>
        <name>e-iceblue</name>
        <url>https://repo.e-iceblue.com/nexus/content/groups/public/</url>
    </repository>
</repositories>
<dependencies>
    <dependency>
        <groupId>e-iceblue</groupId>
        <artifactId>spire.pdf</artifactId>
        <version>11.9.6</version>
    </dependency>
</dependencies>

PdfDocument doc = new PdfDocument();
doc.loadFromFile("C:\work\sample.pdf");

PdfPageBase newPage = doc.getPages().add(PdfPageSize.A4, new PdfMargins(54));
newPage.getCanvas().drawString("这是新添加的页面内容", 
    new PdfTrueTypeFont(new Font("微软雅黑", Font.PLAIN, 18)), 
    PdfBrushes.getBlue(), 0, 0);

PdfPageBase page = doc.getPages().get(0);
Rectangle2D.Float rect = new Rectangle2D.Float(54, 300, 400, 100);
PdfTrueTypeFont font = new PdfTrueTypeFont(new Font("宋体", Font.PLAIN, 14));
PdfSolidBrush brush = new PdfSolidBrush(new PdfRGBColor(Color.BLACK));
page.getCanvas().drawString("这段文字将被绘制在指定的矩形区域内，超出部分会自动换行。", font, brush, rect);

PdfImage image = PdfImage.fromFile("C:\work\logo.png");
page.getCanvas().drawImage(image, 100, 500);

PdfTable table = new PdfTable();
String[][] data = {
    {"姓名", "部门", "入职年份"},
    {"张明", "研发", "2019"},
    {"李丽", "市场", "2020"},
    {"王强", "财务", "2018"}
};
table.setDataSource(data);
// 自定义表格样式
PdfTableStyle style = new PdfTableStyle();
style.getDefaultStyle().setFont(new PdfTrueTypeFont(new Font("Arial", Font.PLAIN, 12)));
table.setStyle(style);
// 在页面上绘制表格
table.draw(page, new Point2D.Float(50, 200));

PdfPopupAnnotation popup = new PdfPopupAnnotation();
popup.setLocation(new Point2D.Double(200, 400));
popup.setText("请确认此数据是否准确。");
popup.setIcon(PdfPopupIcon.Comment);
popup.setColor(new PdfRGBColor(Color.YELLOW));
page.getAnnotations().add(popup);

PdfTextReplaceOptions options = new PdfTextReplaceOptions();
options.setReplaceType(EnumSet.of(ReplaceActionType.IgnoreCase)); // 忽略大小写

for (int i = 0; i < doc.getPages().getCount(); i++) {
    PdfPageBase page = doc.getPages().get(i);
    PdfTextReplacer replacer = new PdfTextReplacer(page);
    replacer.setOptions(options);
    replacer.replaceAllText("Water", "H₂O");
}

PdfImageHelper helper = new PdfImageHelper();
PdfImageInfo[] imageInfos = helper.getImagesInfo(page); // 获取页面上所有图片信息
PdfImage newImage = PdfImage.fromFile("C:\work\new_logo.png");
helper.replaceImage(imageInfos[0], newImage); // 替换第一张图片

doc.getPages().removeAt(0); // 删除第一页

helper.deleteImage(imageInfos[0]); // 删除第一张图片

page.getAnnotationsWidget().removeAt(0); // 删除第一个注释

PdfAttachmentCollection attachments = doc.getAttachments();
if (attachments.size() > 0) {
    attachments.removeAt(0);
}

PdfTrueTypeFont font = new PdfTrueTypeFont(new Font("黑体", Font.PLAIN, 50), true);
String watermark = "机密";
float opacity = 0.3f;

for (int i = 0; i < doc.getPages().getCount(); i++) {
    PdfPageBase page = doc.getPages().get(i);
    page.getCanvas().setTransparency(opacity);
    Dimension2D textSize = font.measureString(watermark);
    double x = (page.getActualSize().getWidth() - textSize.getWidth()) / 2;
    double y = (page.getActualSize().getHeight() - textSize.getHeight()) / 2;
    page.getCanvas().drawString(watermark, font, PdfBrushes.getGray(), x, y);
}

String userPassword = "user123";
String ownerPassword = "admin456";

PdfPasswordSecurityPolicy policy = new PdfPasswordSecurityPolicy(userPassword, ownerPassword);
policy.setEncryptionAlgorithm(PdfEncryptionAlgorithm.AES_256);
policy.setDocumentPrivilege(PdfDocumentPrivilege.getAllowAll());
policy.getDocumentPrivilege().setAllowModifyContents(false);
policy.getDocumentPrivilege().setAllowContentCopying(false);

doc.encrypt(policy);

doc.saveToFile("C:\work\output.pdf");
doc.close();