如何读取pdf文件并将其写入outputStream

我需要读取带有文件路径“C：\ file.pdf”的pdf文件并将其写入outputStream。 最简单的方法是什么？

@Controller public class ExportTlocrt { @Autowired private PhoneBookService phoneBookSer; private void setResponseHeaderTlocrtPDF(HttpServletResponse response) { response.setContentType("application/pdf"); response.setHeader("content-disposition", "attachment; filename=Tlocrt.pdf" ); } @RequestMapping(value = "/exportTlocrt.html", method = RequestMethod.POST) public void exportTlocrt(Model model, HttpServletResponse response, HttpServletRequest request){ setResponseHeaderTlocrtPDF(response); File f = new File("C:\\Tlocrt.pdf"); try { OutputStream os = response.getOutputStream(); byte[] buf = new byte[8192]; InputStream is = new FileInputStream(f); int c = 0; while ((c = is.read(buf, 0, buf.length)) > 0) { os.write(buf, 0, c); os.flush(); } os.close(); is.close(); } catch (IOException e) { e.printStackTrace(); } } } 

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Answer 1

 import java.io.*; public class FileRead { public static void main(String[] args) throws IOException { File f=new File("C:\\Documents and Settings\\abc\\Desktop\\abc.pdf"); OutputStream oos = new FileOutputStream("test.pdf"); byte[] buf = new byte[8192]; InputStream is = new FileInputStream(f); int c = 0; while ((c = is.read(buf, 0, buf.length)) > 0) { oos.write(buf, 0, c); oos.flush(); } oos.close(); System.out.println("stop"); is.close(); } } 

到目前为止最简单的方法。 希望这可以帮助。

Answer 2

您可以使用Apache的PdfBox ，它易于使用且性能良好。

以下是从PDF文件中提取文本的示例（您可以在此处阅读更多内容）：

 import java.io.*; import org.apache.pdfbox.pdmodel.*; import org.apache.pdfbox.util.*; public class PDFTest { public static void main(String[] args){ PDDocument pd; BufferedWriter wr; try { File input = new File("C:\\Invoice.pdf"); // The PDF file from where you would like to extract File output = new File("C:\\SampleText.txt"); // The text file where you are going to store the extracted data pd = PDDocument.load(input); System.out.println(pd.getNumberOfPages()); System.out.println(pd.isEncrypted()); pd.save("CopyOfInvoice.pdf"); // Creates a copy called "CopyOfInvoice.pdf" PDFTextStripper stripper = new PDFTextStripper(); wr = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(output))); stripper.writeText(pd, wr); if (pd != null) { pd.close(); } // I use close() to flush the stream. wr.close(); } catch (Exception e){ e.printStackTrace(); } } } 

更新：

您可以使用PDFTextStripper获取文本：

 PDFTextStripper reader = new PDFTextStripper(); String pageText = reader.getText(pd); // PDDocument object created