1 protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

 2         String realPath = "C:\\CS\\Java\\IdeaProjects\\JavaWebLearn\\practice01\\src\\main\\resources\\csgo.png";//绝对路径写法

 3

 4         String path = realPath.substring(realPath.lastIndexOf("\\"));

 5

 6         resp.setHeader("Content-Disposition", "attachment;filename" + path);

 7

 8         FileInputStream in = new FileInputStream(realPath);

 9         int len = 0;

10         byte[] buffer = new byte[1024];

11

12         ServletOutputStream out = resp.getOutputStream();

13

14         while ((len = in.read(buffer)) != -1) {

15             out.write(buffer,0,len);

16         }

17

18         out.close();

19         in.close();

20     }