html:file标签的使用

html:file标签的使用

        FormFile upfile  =  update.getUpfile();


        String realPath  =  getServlet().getServletContext().getRealPath( " / " );

        
//         String realPath = request.getRealPath("");

        
        String filepath  =  realPath + " /upfile " ;
        String filename  =  upfile.getFileName();
         int  filesize  =  upfile.getFileSize();
        File file = new  File(filepath,filename);
         byte  a[]  =   new   byte [filesize];
         try  {
            InputStream in  =  upfile.getInputStream();
             int  read = 0 ;                  // 实际读出的文件长度
             int  allread = 0 ;                // 共读出的文件长度
             while (allread < filesize){
                read = in.read(a,allread,filesize);
                allread += read;
            }
            FileOutputStream out = new  FileOutputStream(file);
            out.write(a);
            in.close();
            out.close();
            
        }  catch  (FileNotFoundException e) {
             //  TODO Auto-generated catch block
            e.printStackTrace();
        }  catch  (IOException e) {
             //  TODO Auto-generated catch block
            e.printStackTrace();
        }