Java实现txt转pdf完整demo，开箱即用。
// 读取TXT文件
FileInputStream inputStream = new FileInputStream(new File(inputTxtFile));
byte[] inputBytes = new byte[inputStream.available()];
inputStream.read(inputBytes);
inputStream.close();
// 创建PDF文档
Document document = new Document();
PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(outputPdfFile));
document.open();
