javaweb上传下载实例完整版解析(下)

 @RequestMapping(value = "/download", method = RequestMethod.POST) @ResponseBody public Map download(HttpServletRequest request, HttpServletResponse response, ModelMap model) throws ServletException, IOException{ Map map = fileLoadService.doGet(request, response); return map; } 

 /** * 文件下载显示 * @ClassName: FileLoadServiceImpl * @throws IOException * @throws ServletException */ @Override public Map doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{ //获取上传文件的目录 String uploadFilePath = "/D:/Download/"; //存储要下载的文件名 Map fileNameMap = new HashMap(); //递归遍历filepath目录下的所有文件和目录，将文件的文件名存储到map集合中 listfile(new File(uploadFilePath),fileNameMap); return fileNameMap; } public void listfile(File file,Map map){ //如果file代表的不是一个文件，而是一个目录 if(!file.isFile()){ //列出该目录下的所有文件和目录 File files[] = file.listFiles(); //遍历files[]数组 for(File f : files){ //递归 listfile(f,map); } }else{ String realName = file.getName().substring(file.getName().indexOf("_")+1); //file.getName()得到的是文件的原始名称，这个名称是唯一的，因此可以作为key，realName是处理过后的名称，有可能会重复 map.put(file.getName(), realName); } } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } 

 @RequestMapping(value = "/downloadFile", method = RequestMethod.GET) @ResponseBody public void downloadFile(HttpServletRequest request, HttpServletResponse response, ModelMap model) throws ServletException, IOException{ String filename =request.getParameter("fileName"); fileLoadService.doGetFile(request, response ,filename); } 

 /** * 下载文件到本地 start */ @Override public void doGetFile(HttpServletRequest request, HttpServletResponse response,String filename) throws ServletException,IOException { //得到要下载的文件名 String fileName = filename; fileName = new String(fileName.getBytes("iso8859-1"),"UTF-8"); String fileSaveRootPath="/D:/Download"; File file = new File(fileSaveRootPath + "/" + fileName); //如果文件不存在 if(!file.exists()){ request.setAttribute("message", "您要下载的资源已被删除！！"); return; } //处理文件名 String realname = fileName.substring(fileName.indexOf("_")+1); //设置响应头，控制浏览器下载该文件 response.setHeader("content-disposition", "attachment;filename=" + URLEncoder.encode(realname, "UTF-8")); InputStream fis = new BufferedInputStream(new FileInputStream(fileSaveRootPath + "\\" + fileName)); byte[] buffer = new byte[fis.available()]; fis.read(buffer); //读取文件流 fis.close(); response.reset(); //重置结果集 response.setHeader("content-disposition", "attachment;filename=" + URLEncoder.encode(realname, "UTF-8")); response.addHeader("Content-Length", "" + file.length()); //返回头 文件大小 response.setContentType("application/octet-stream");  //设置数据种类 OutputStream os = new BufferedOutputStream(response.getOutputStream()); os.write(buffer); // 输出文件 os.flush(); os.close(); } public void doPostFile(HttpServletRequest request, HttpServletResponse response,String filename)throws ServletException, IOException { doGetFile(request, response,filename); }