Java常见的3种文件上传方法和速度对比

@RequestMapping("springUpload")
    public String  springUpload(httpservletRequest request) throws IllegalStateException, IOException
    {
         long  startTime=System.currentTimeMillis();
         //将当前上下文初始化给  CommonsMutipartResolver （多部分解析器）
        CommonsMultipartResolver multipartResolver=new CommonsMultipartResolver(
                request.getSession().getServletContext());
        //检查fORM中是否有enctype="multipart/form-data"
        if(multipartResolver.isMultipart(request))
        {
            //将request变成多部分request
            MultipartHttpServletRequest multiRequest=(MultipartHttpServletRequest)request;
           //获取multiRequest 中所有的文件名
            Iterator iter=multiRequest.getFileNames();
              
            while(iter.hasNext())
            {
                 
                //一次遍历所有文件
                MultipartFile file=multiRequest.getFile(iter.next().toString());
                if(file!=null)
                {
                    String path="E:/springUpload"+file.getOriginalFilename();
                    //上传
                    file.transferTo(new File(path));
                }
                  
            }
            
        }
        long  endTime=System.currentTimeMillis();
        System.out.println("Spring方法的运行时间："+String.valueOf(endTime-startTime)+"ms");
        return "/success";
    }

    @RequestMapping("fileUpload2")
    public String  fileUpload2(@RequestParam("file") CommonsMultipartFile file) throws IOException {
         long  startTime=System.currentTimeMillis();
        System.out.println("fileName："+file.getOriginalFilename());
        String path="E:/"+new Date().getTime()+file.getOriginalFilename();
          
        File newFile=new File(path);
        //通过CommonsMultipartFile的方法直接写文件（注意这个时候）
        file.transferTo(newFile);
        long  endTime=System.currentTimeMillis();
        System.out.println("采用file.Transto的运行时间："+String.valueOf(endTime-startTime)+"ms");
        return "/success";
    }

@RequestMapping("fileUpload")
    public String  fileUpload(@RequestParam("file") CommonsMultipartFile file) throws IOException {
          
        //用来检测程序运行时间
        long  startTime=System.currentTimeMillis();
        System.out.println("fileName："+file.getOriginalFilename());
          
        try {
            //获取输出流
            OutputStream os=new FileOutputStream("E:/"+new Date().getTime()+file.getOriginalFilename());
            //获取输入流 CommonsMultipartFile 中可以直接得到文件的流
            InputStream is=file.getInputStream();
            byte[] bts = new byte[1024];
            //一个一个字节的读取并写入
            while(is.read(bts)!=-1)
            {
                os.write(bts);
            }
           os.flush();
           os.close();
           is.close();
          
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        long  endTime=System.currentTimeMillis();
        System.out.println("采用流上传的方式的运行时间："+String.valueOf(endTime-startTime)+"ms");
        return "/success";
    }