Java PDFStamper 是一个用于处理 PDF 文档的库,但它已经被废弃,现在推荐使用 iText 或 Apache PDFBox 等其他库。这里我将为您提供一些关于使用 iText 库的建议来解决常见问题。
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添加 iText 依赖项:
对于 Maven 项目,请在 pom.xml 文件中添加以下依赖项:
对于 Gradle 项目,请在 build.gradle 文件中添加以下依赖项:
implementation 'com.itextpdf:itext7-core:7.1.16'
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合并 PDF 文件:
import com.itextpdf.kernel.pdf.*; public void mergePdfFiles(List
inputFiles, String outputFile) { PdfWriter writer = new PdfWriter(outputFile); PdfDocument pdfDocument = new PdfDocument(writer); for (String inputFile : inputFiles) { PdfReader reader = new PdfReader(inputFile); PdfDocument sourceDocument = new PdfDocument(reader); sourceDocument.copyPagesTo(1, sourceDocument.getNumberOfPages(), pdfDocument); sourceDocument.close(); } pdfDocument.close(); } -
分割 PDF 文件:
import com.itextpdf.kernel.pdf.*; public void splitPdfFile(String inputFile, String outputPath, int startPage, int endPage) { PdfReader reader = new PdfReader(inputFile); PdfDocument pdfDocument = new PdfDocument(reader); int numberOfPages = pdfDocument.getNumberOfPages(); for (int i = startPage; i <= endPage && i <= numberOfPages; i++) { PdfWriter writer = new PdfWriter(outputPath + "/page_" + i + ".pdf"); PdfDocument splitDocument = new PdfDocument(writer); pdfDocument.copyPagesTo(i, i, splitDocument); splitDocument.close(); } pdfDocument.close(); }
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添加水印:
import com.itextpdf.kernel.pdf.*; import com.itextpdf.layout.Document; import com.itextpdf.layout.element.Paragraph; import com.itextpdf.layout.property.TextAlignment; public void addWatermark(String inputFile, String outputFile, String watermarkText) { PdfReader reader = new PdfReader(inputFile); PdfWriter writer = new PdfWriter(outputFile); PdfDocument pdfDocument = new PdfDocument(reader, writer); Document document = new Document(pdfDocument); for (int i = 1; i <= pdfDocument.getNumberOfPages(); i++) { Paragraph watermark = new Paragraph(watermarkText) .setFontSize(48) .setFontColor(ColorConstants.RED) .setTextAlignment(TextAlignment.CENTER); document.showTextAligned(watermark, 297.5f, 421, i, TextAlignment.CENTER, VerticalAlignment.MIDDLE, 45); } document.close(); }
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添加页眉和页脚:
import com.itextpdf.kernel.pdf.*; import com.itextpdf.layout.Document; import com.itextpdf.layout.element.Paragraph; import com.itextpdf.layout.property.TextAlignment; public void addHeaderAndFooter(String inputFile, String outputFile, String headerText, String footerText) { PdfReader reader = new PdfReader(inputFile); PdfWriter writer = new PdfWriter(outputFile); PdfDocument pdfDocument = new PdfDocument(reader, writer); Document document = new Document(pdfDocument); for (int i = 1; i <= pdfDocument.getNumberOfPages(); i++) { // Add header Paragraph header = new Paragraph(headerText) .setFontSize(12) .setTextAlignment(TextAlignment.CENTER); document.showTextAligned(header, 297.5f, 806, i, TextAlignment.CENTER, VerticalAlignment.MIDDLE, 0); // Add footer Paragraph footer = new Paragraph(footerText + " | Page " + i) .setFontSize(12) .setTextAlignment(TextAlignment.CENTER); document.showTextAligned(footer, 297.5f, 55, i, TextAlignment.CENTER, VerticalAlignment.MIDDLE, 0); } document.close(); }
这些示例应该可以帮助您解决使用 Java PDFStamper 时遇到的常见问题。如果您需要更多功能,请查看 iText 官方文档:https://itextpdf.com/en/resources/documentation