Java 如何在SpringMVC中下载PDF文件？

这是我的文件路径

public final static String BOOKINGPDFFILE= "D:/Hotels/pdf/";

下面的代码是我为从上述资源文件夹下载pdf而编写的

Pdf="column name in database  i used for storing in database"

@RequestMapping(value = "/getpdf/{pdf}", method = RequestMethod.GET)
public  void getPdf(@PathVariable("pdf") String fileName, HttpServletResponse response,HttpServletRequest request) throws IOException {


   try {
        File file = new File(FileConstant.BOOKINGPDFFILE + fileName+ ".pdf");


        Files.copy(file.toPath(),response.getOutputStream());
    } catch (IOException ex) {
        System.out.println("Contract Not Found");
        System.out.println(ex.getMessage());
    }

}

---

您需要创建AbstractPdfView的实现来实现这一点。。您可以参考此链接，您可以尝试以下内容：

@RequestMapping(method = { RequestMethod.GET }, value = { "/downloadPdf" })
    public ResponseEntity<InputStreamResource> downloadPdf()
    {
        try
        {
            File file = new File(BOOKINGPDFFILE);
            HttpHeaders respHeaders = new HttpHeaders();
            MediaType mediaType = MediaType.parseMediaType("application/pdf");
            respHeaders.setContentType(mediaType);
            respHeaders.setContentLength(file.length());
            respHeaders.setContentDispositionFormData("attachment", file.getName());
            InputStreamResource isr = new InputStreamResource(new FileInputStream(file));
            return new ResponseEntity<InputStreamResource>(isr, respHeaders, HttpStatus.OK);
        }
        catch (Exception e)
        {
            String message = "Errore nel download del file "+idForm+".csv; "+e.getMessage();
            logger.error(message, e);
            return new ResponseEntity<InputStreamResource>(HttpStatus.INTERNAL_SERVER_ERROR);
        }
    }

@RequestMapping（方法={RequestMethod.GET}，值={”/downloadPdf}）
公众回应下载PDF（）
{
尝试
{
文件文件=新文件（BookingPdfile）；
HttpHeaders respHeaders=新的HttpHeaders（）；
MediaType MediaType=MediaType.parseMediaType（“application/pdf”）；
respHeaders.setContentType（mediaType）；
respHeaders.setContentLength（file.length（））；
setContentDispositionFormData（“附件”，file.getName（））；
InputStreamResource isr=新的InputStreamResource（新文件InputStream（文件））；
返回新的ResponseEntity（isr、RespHeader、HttpStatus.OK）；
}
捕获（例外e）
{
String message=“Errore nel download del file”+idForm+.csv；“+e.getMessage（）；
记录器。错误（消息，e）；
返回新的响应属性（HttpStatus.INTERNAL_SERVER_ERROR）；
}
}

在您的网页中，您可以这样写链接：

<a href="/yourWebAppCtx/yourControllerRoot/downloadPdf" target="_blank"> download PDF </a>

---

这是方法，希望对你有所帮助

@RequestMapping(value = "/getpdf/{pdf}", method = RequestMethod.GET)
public  void getPdf(@PathVariable("pdf") String fileName, HttpServletResponse response) throws IOException {

    try {
        File file = new File(FileConstant.BOOKINGPDFFILE + fileName+ ".pdf");

        if (file.exists()) {
            // here I use Commons IO API to copy this file to the response output stream, I don't know which API you use.
            FileUtils.copyFile(file, response.getOutputStream());

            // here we define the content of this file to tell the browser how to handle it
            response.setContentType("application/pdf");
            response.setHeader("Content-disposition", "attachment;filename=" + fileName + ".pdf");
            response.flushBuffer();
        } else {
            System.out.println("Contract Not Found");
        }
    } catch (IOException exception) {
        System.out.println("Contract Not Found");
        System.out.println(exception.getMessage());
    }
}

---

这是你问题的详细答案。 让我从服务器端代码开始：

下面的类用于创建包含一些随机内容的pdf，并返回等效的字节数组outputstream

public class pdfgen extends AbstractPdfView{

 private static ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();

public ByteArrayOutputStream showHelp() throws Exception {
    Document document = new Document();
   // System.IO.MemoryStream ms = new System.IO.MemoryStream();
    PdfWriter.getInstance(document,byteArrayOutputStream);
    document.open();
    document.add(new Paragraph("table"));
    document.add(new Paragraph(new Date().toString()));
    PdfPTable table=new PdfPTable(2);

    PdfPCell cell = new PdfPCell (new Paragraph ("table"));

    cell.setColspan (2);
    cell.setHorizontalAlignment (Element.ALIGN_CENTER);
    cell.setPadding (10.0f);
    //cell.setBackgroundColor (new BaseColor (140, 221, 8));                                  

    table.addCell(cell);                                    
    ArrayList<String[]> row=new ArrayList<String[]>();
    String[] data=new String[2];
    data[0]="1";
    data[1]="2";
    String[] data1=new String[2];
    data1[0]="3";
    data1[1]="4";
    row.add(data);
    row.add(data1);

    for(int i=0;i<row.size();i++) {
      String[] cols=row.get(i);
      for(int j=0;j<cols.length;j++){
        table.addCell(cols[j]);
      }
    }

    document.add(table);
    document.close();

    return byteArrayOutputStream;   
}

---

好的，我正在浏览它，如果我想在浏览器中打开文件，在下一个选项卡中打开它自己，我也在使用Commons IO，但在这一部分我得到了错误FileUtils.copyFile（file，response.getOutputStream（））；如果你能留下更多关于错误和Spring MVC配置的详细信息，我可以帮助你。错误基本上是404找不到。当我单击下载按钮时，它会重定向到新选项卡并显示“404找不到”。我需要添加这部分吗我使用的是4.0.1 Spring framework..itext for pdf generationLook，您误解了资源标记的用法，因为它被配置为向WEB声明公共资源，如图像、静态html等。您可能正在使用itext生成PDF，并在OS temp目录中执行此操作。如果不是这样，那么我建议您使用此文件夹进行此类工作。然后，一旦准备好下载文件，只需使用以下代码指示文件的位置：

file file file=new file（FileUtils.gettempredirectorypath（）+“/”+fileName+”.pdf）。魔法是通过
response.flushBuffer（）完成的指令。您对我提供的指令所做的是：1。将我的文件复制到将写入客户端（本例中为浏览器）的缓冲区。2.告诉客户端要处理的文件的内容和名称。3.将此文件提交到客户端。
ResponseEntity
从何处导入？
@RequestMapping(path="/home")
public ResponseEntity<byte[]> render(HttpServletRequest request , HttpServletResponse response) throws IOException
{
  pdfgen pg=new pdfgen();
    response.setContentType("application/pdf");
    response.setHeader("Content-Disposition", "attachment:filename=report.pdf");
    try {
            OutputStream out = response.getOutputStream();
    }
  catch (IOException e){
        e.printStackTrace();
    }
    byte[] contents = null;
    try {
        contents = pg.showHelp().toByteArray();
    } 
  catch (Exception e) {
        e.printStackTrace();
    }
  //These 3 lines are used to write the byte array to pdf file
  /*FileOutputStream fos = new FileOutputStream("/Users/naveen-pt2724/desktop/nama.pdf");
  fos.write(contents);
  fos.close();*/
    HttpHeaders headers = new HttpHeaders();
    headers.setContentType(MediaType.parseMediaType("application/pdf"));
//Here you have to set the actual filename of your pdf
    String filename = "output.pdf";
    headers.setContentDispositionFormData(filename, filename);
    headers.setCacheControl("must-revalidate, post-check=0, pre-check=0");
    ResponseEntity<byte[]> respons = new ResponseEntity<byte[]>(contents, headers, HttpStatus.OK);
    return respons;
}

 $.ajax({
            url:'/PDFgen/home',
            method:'POST',
            cache:false,
             xhrFields: {
                    responseType: 'blob'
                  },
              success: function(data) {
                  //alert(data);
                let blob = new Blob([data], {type: 'application/pdf'}); //mime type is important here
                let link = document.createElement('a'); //create hidden a tag element
                let objectURL = window.URL.createObjectURL(blob); //obtain the url for the pdf file
                link.href = objectURL; // setting the href property for a tag
                link.target = '_blank'; //opens the pdf file in  new tab
                link.download = "fileName.pdf"; //makes the pdf file download
                (document.body || document.documentElement).appendChild(link); //to work in firefox
                link.click(); //imitating the click event for opening in new tab
              },
            error:function(xhr,stats,error){
                 alert(error);
            }  
        });