将文本转换为 PDF

在线尝试。您可以在此链接检查 Aspose.PDF 转换的质量并在线查看结果。 products.aspose.app/pdf/conversion/txt-to-pdf

Aspose.PDF for Android via Java 提供将文本文件转换为 PDF 格式的功能。在本文中，我们演示如何使用 Aspose.PDF 轻松高效地将文本文件转换为 PDF。

当需要将 Text 文件转换为 PDF 时，首先使用某个读取器读取源文本文件。我们使用 StringBuilder 来读取 Text 文件的内容。实例化 Document 对象并在 Pages 集合中添加一个新页面。创建一个 TextFragment 对象并将 StringBuilder 对象传递给其构造函数。使用 TextFragment 对象在 Paragraphs 集合中添加一个新段落，并使用 Document 类的 Save 方法保存生成的 PDF 文件。

将纯文本文件转换为 PDF

public void convertTXTtoPDF_Simple () {
        // Initialize document object

        File pdfDocumentFileName=new File(fileStorage, "demo_txt.pdf");
        File txtDocumentFileName=new File(fileStorage, "Conversion/rfc822.txt");

        // Instantiate a Document object by calling its empty constructor
        document=new Document();

        // Add a new page in Pages collection of Document
        Page page=document.getPages().add();

        String string;
        StringBuilder stringBuilder=new StringBuilder();
        InputStream is;
        try {
            is=new FileInputStream(txtDocumentFileName);
        } catch (FileNotFoundException e) {
            resultMessage.setText(e.getMessage());
            return;
        }
        BufferedReader reader=new BufferedReader(new InputStreamReader(is));
        while (true) {
            try {
                if ((string=reader.readLine()) == null) break;
            } catch (IOException e) {
                resultMessage.setText(e.getMessage());
                return;
            }
            stringBuilder.append(string).append("\n");
        }
        try {
            is.close();
        } catch (IOException e) {
            resultMessage.setText(e.getMessage());
            return;
        }


        // Create an instance of TextFragment and pass the text from reader object to its
        // constructor as argument
        TextFragment text=new TextFragment(stringBuilder.toString());

        // Add a new text paragraph in paragraphs collection and pass the TextFragment
        // object
        page.getParagraphs().add(text);

        // Save resultant PDF file
        try {
            document.save(pdfDocumentFileName.toString());
        } catch (Exception e) {
            resultMessage.setText(e.getMessage());
            return;
        }
        resultMessage.setText(R.string.success_message);
    }

将预格式化文本文件转换为 PDF

    public void convertPreFormattedTextToPdf () {

        File txtDocumentFile=new File(fileStorage, "Conversion/rfc822.txt");
        File pdfDocumentFileName=new File(fileStorage, "demo_txt.pdf");
        Path txtDocumentFileName=Paths.get(txtDocumentFile.toString());

        // Read the text file as array of string
        List<String> lines;
        try {
            lines=Files.readAllLines(txtDocumentFileName, ENCODING);
        } catch (IOException e) {
            resultMessage.setText(e.getMessage());
            return;
        }

        // Instantiate a Document object by calling its empty constructor
        document=new Document();

        // Add a new page in Pages collection of Document
        Page page=document.getPages().add();
        int count=4;

        Font font=FontRepository.findFont("Droid Sans Mono");
        // Set left and right margins for better presentation
        page.getPageInfo().getMargin().setLeft(20);
        page.getPageInfo().getMargin().setRight(10);
        page.getPageInfo().getDefaultTextState().setFont(font);
        page.getPageInfo().getDefaultTextState().setFontSize(12);

        for (String line : lines) {
            // check if line contains "form feed" character
            // see https://en.wikipedia.org/wiki/Page_break
            if (line.startsWith("\f")) {
                page=document.getPages().add();
                page.getPageInfo().getMargin().setLeft(20);
                page.getPageInfo().getMargin().setRight(10);
                page.getPageInfo().getDefaultTextState().setFont(font);
                page.getPageInfo().getDefaultTextState().setFontSize(12);
            } else {
                // Create an instance of TextFragment and
                // pass the line to its
                // constructor as argument
                TextFragment text=new TextFragment(line);

                // Add a new text paragraph in paragraphs collection and pass the TextFragment
                // object
                page.getParagraphs().add(text);
            }
        }
        // Save resultant PDF file
        try {
            document.save(pdfDocumentFileName.toString());
        } catch (Exception e) {
            resultMessage.setText(e.getMessage());
            return;
        }
        resultMessage.setText(R.string.success_message);
    }