Java / JSP 文件上传与下载

冷不防 2022-07-11 08:06 154阅读 0赞

## 文件上传 ##

jsp:

java:

@RequestMapping(value = "/save")
    public String save(ModelMap model, HttpServletRequest request)
    {//TODO 保存
        String dirPath = "/pdffiles/"; //文件夹名
        dirPath = request.getRealPath(dirPath)+"/"; 
        String fileName;
        try {
            MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
            List<MultipartFile> fileList = multipartRequest.getFiles("fileUpload");
            for (MultipartFile mf : fileList) {
                if(!mf.isEmpty()){
                    if (mf.getContentType().equals("application/pdf")){
                        fileName = UUID.randomUUID() + "." + FilenameUtils.getExtension(mf.getOriginalFilename());
                        String savePath = dirPath  + fileName;
                        File file =new File(savePath); 
                        if (!file.getParentFile().exists()) 
                        {
                            file.getParentFile().mkdirs();
                        }
                        InputStream in=mf.getInputStream(); 
                        FileOutputStream fos=new FileOutputStream(savePath); 
                        byte[] buffer=new byte[1024]; 
                        while(in.read(buffer)>0){  
                            fos.write(buffer); 
                            fos.flush(); 
                        }  
                        in.close(); 
                        fos.close(); 
                        getParames().put("instructionBookDirectory", savePath);
                    }
                }
            }
        }catch (Exception e) {
            e.printStackTrace();
        }
        service.update(getParames());
        return "redirect:list.jhtml";
    }

## 文件下载 ##

jsp:

java:

// 下载文件
    @RequestMapping(value = "/downloadfile")
    public void downloadfile(ModelMap model, HttpServletResponse response)
    {
       response.setContentType("charset=UTF-8"); 
       Object dir = getParames().get("dir");
       if(dir!=null){
           File file = new File(dir.toString());  
           response.setHeader("Content-Disposition", "attachment; filename=a");   
           BufferedInputStream bis = null;  
           BufferedOutputStream bos = null;  
           OutputStream fos = null;  
           InputStream fis = null;  
           try {  
                fis = new FileInputStream(file.getAbsolutePath());  
                bis = new BufferedInputStream(fis);  
                fos = response.getOutputStream();  
                bos = new BufferedOutputStream(fos);  
                int bytesRead = 0;  
                byte[] buffer = new byte[5 * 1024];  
                while ((bytesRead = bis.read(buffer)) != -1) {  
                    bos.write(buffer, 0, bytesRead);  
                }  
                bos.flush();  
            }catch(Exception e){  
                e.printStackTrace();
            }finally {  
                try {  
                    bis.close();  
                    bos.close();  
                    fos.close();  
                    fis.close();  
                } catch (Exception e) {  
                    e.printStackTrace();  
                }  
            } 
       } 
    }