![img](public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html;charset=utf-8");
String filename = request.getParameter("filename");
//String folder = "/jier/";
response.addHeader("Content-Type", "application/octet-stream");
response.addHeader("Content-Disposition", "attachment;filename="+filename);
//
InputStream in = getServletContext().getResourceAsStream(folder+filename);
//
OutputStream out = response.getOutputStream();
byte[] buffer = new byte[1024];
int len;
while((len = in.read(buffer))!= -1) {
out.write(buffer,0,len);
}
}https://img-mid.csdnimg.cn/release/static/image/mid/ask/401008025626115.png)
filename 是绝对路径 代码怎么写才能运行