1、准備上傳下載的api組件
<dependency> <groupId>commons-io</groupId> <artifactId>commons-io</artifactId> <version>2.4</version> </dependency> <dependency> <groupId>commons-fileupload</groupId> <artifactId>commons-fileupload</artifactId> <version>1.3.1</version> </dependency>
2、編寫前台上傳表單
<body>
請點擊下載：<a href="user/download?filename=moni.jpg">moni.jpg</a>
</body>
3、編寫controller層（
在conreoller層拼接附件名字和所在文件夾位置（path）,創建輸出流直接寫入response中）
/** * 文件下載 * @throws IOException */ @RequestMapping(value="/download",method=RequestMethod.GET) public void download(@RequestParam(value="filename")String filename, HttpServletRequest request, HttpServletResponse response) throws IOException { //模擬文件，myfile.txt為需要下載的文件 String path = request.getSession().getServletContext().getRealPath("statics\\upload")+"\\"+filename; //獲取輸入流 InputStream bis = new BufferedInputStream(new FileInputStream(new File(path))); //轉碼，免得文件名中文亂碼 filename = URLEncoder.encode(filename,"UTF-8"); //設置文件下載頭 response.addHeader("Content-Disposition", "attachment;filename=" + filename); //1.設置文件ContentType類型，這樣設置，會自動判斷下載文件類型 response.setContentType("multipart/form-data"); BufferedOutputStream out = new BufferedOutputStream(response.getOutputStream()); int len = 0; while((len = bis.read()) != -1){ out.write(len); out.flush(); } out.close(); }