1 request.setCharacterEncoding("utf-8"); 2         String name=request.getParameter("name"); 3         //1、设置响应头 4         response.setContentType("application/force-download"); 5         //2、读取文件 6         String path=getServletContext().getRealPath("/file/"+name); 7         InputStream in=new FileInputStream(path); 8         //3、对文件名进行编码 9         name=URLEncoder.encode(name, "utf-8");10         //4、设置响应头11         response.setHeader("Content-Disposition","attachment;filename="+name);//如果不写attachment，则会在浏览器中打开12         response.setContentLength(in.available());13         //5、开始copy文件14         OutputStream out=response.getOutputStream();15         byte[] b=new byte[1024];16         int len=-1;17         while((len=in.read(b))!=-1)18         {19             out.write(b, 0, len);20         }21         out.close();22         in.close();23         24         25     }