我正在使用iText將 HTML 轉換為 PDF 文件。我意識到輸出文件大小太大，因此我決定使用它PdfSmartCopy來刪除對象重復項。PdfSmartCopy我可以在 HTML 到 PDF 過程完成后使用，例如，我用來PdfSmartCopy從磁盤加載文件并將 PDF 轉換為較小的尺寸。我的問題是，我可以簡化PdfSmartCopyHTML 到 PDF 的流程嗎？我發現這PdfSmartCopy是 的子類PdfWriter。所以我將代碼更改為：public static void main(String[] args) throws Exception { try (OutputStream file = new FileOutputStream(new File("output.pdf"))) { Document document = new Document(PageSize.A4); //PdfWriter writer = PdfWriter.getInstance(document, file); // remove this line PdfSmartCopy pdfCopy = new PdfSmartCopy(document, file); // change to this line pdfCopy.setInitialLeading(12.5f); document.open(); CSSResolver cssResolver = new StyleAttrCSSResolver(); CssFile cssFile = XMLWorkerHelper.getCSS(new FileInputStream("itext2\\css\\bootstrap.min.css")); cssResolver.addCss(cssFile); HtmlPipelineContext htmlContext = new HtmlPipelineContext(null); htmlContext.setTagFactory(Tags.getHtmlTagProcessorFactory()); PdfWriterPipeline pdf = new PdfWriterPipeline(document, pdfCopy); HtmlPipeline html = new HtmlPipeline(htmlContext, pdf); CssResolverPipeline css = new CssResolverPipeline(cssResolver, html); XMLWorker worker = new XMLWorker(css, true); XMLParser p = new XMLParser(worker); String fileContent = PdfTest.readFile("itext2\\template.html"); p.parse(new StringReader(fileContent)); document.close(); pdfCopy.close(); file.close(); } catch (Exception e) { e.printStackTrace(); }}PdfSmartCopy是否可以在進行 HTML 到 PDF 渲染的同時使用？https://api.itextpdf.com/iText5/5.5.9/com/itextpdf/text/pdf/PdfSmartCopy.html#PdfSmartCopy-com.itextpdf.text.Document-java.io.OutputStream-
1 回答
qq_遁去的一_1
TA貢獻1725條經驗 獲得超8個贊
在HTML到PDF的渲染過程中，我將其保存到內存中，稍后用于PdfSmartCopy生成slim pdf版本，這可以防止我在文件系統中生成兩個不同的pdf文件（稍后無法刪除）非纖薄的），如果對其他人有幫助，請粘貼以下代碼：
try (ByteArrayOutputStream byteData = new ByteArrayOutputStream()) {
? ? Document document = new Document(PageSize.A4);
? ? PdfWriter writer = PdfWriter.getInstance(document, byteData);? ? ? ? ? ?
? ? writer.setInitialLeading(12.5f);
? ? document.open();
? ? CSSResolver cssResolver = new StyleAttrCSSResolver();
? ? CssFile cssFile = XMLWorkerHelper.getCSS(new FileInputStream("itext2\\css\\bootstrap.min.css"));
? ? cssResolver.addCss(cssFile);
? ? HtmlPipelineContext htmlContext = new HtmlPipelineContext(null);
? ? htmlContext.setTagFactory(Tags.getHtmlTagProcessorFactory());
? ? PdfWriterPipeline pdf = new PdfWriterPipeline(document, writer);
? ? HtmlPipeline html = new HtmlPipeline(htmlContext, pdf);
? ? CssResolverPipeline css = new CssResolverPipeline(cssResolver, html);
? ? XMLWorker worker = new XMLWorker(css, true);
? ? XMLParser p = new XMLParser(worker);
? ? String fileContent = PdfTest.readFile("itext2\\template.html");
? ? p.parse(new StringReader(fileContent));
? ? document.close();
? ? PdfReader reader = new PdfReader(byteData.toByteArray());
? ? Document document1 = new Document();
? ? File resultFile = new File("result.pdf");
? ? PdfSmartCopy pdfCopy = new PdfSmartCopy(document1, new FileOutputStream(resultFile));
? ? document1.open();
? ? PdfImportedPage page;
? ? for (int pageNumber = 1; pageNumber <= reader.getNumberOfPages(); pageNumber++) {
? ? ? ? page = pdfCopy.getImportedPage(reader, pageNumber);
? ? ? ? pdfCopy.addPage(page);
? ? }
? ? document1.close();
? ? byteData.close();
} catch (Exception e) {
? ? e.printStackTrace();
}
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