파일 다운로드

현재의 폴더 위치를 얻은후에 폴더/파일명에 접근합니다

파일명이 계속 달라져야 하는 경우 jsp에서 submit 하면 되겠습니다

String filename = "파일명";

			String path = "/";   

			ServletContext context = getServletContext();
			String absFolder = context.getRealPath(path);   

			System.out.println(absFolder);


			String filePath = absFolder+"/폴더/"; 
			InputStream in = null;
			OutputStream os = null;
			File file = null;
			File viewFile = null;
			boolean skip = false;
			String client = "";

			try {
				String fname1 = "";
				String fname2 = "";
				String fname = "";
				fname = filename;
				fname1 = new String(fname.getBytes("8859_1"), "utf-8");

				try {
					file = new File(filePath, fname);
					viewFile = new File(filePath, fname1);
					//out.print("file : " + file);
					in = new FileInputStream(file);
				} catch (FileNotFoundException fe) {
					skip = true;
				}//catch

				fname2 = new String(fname1.getBytes("utf-8"), "8859_1");

				response.reset();
				client = request.getHeader("User-Agent");
				response.setContentType("application/x-msdownload;");
				response.setHeader("Content-Description", "JSP Generated Data");

				if (!skip) {
					if (client.indexOf("MSIE 5.5") != -1) {
						response.setHeader("Content-Type",
								"doesn/matter; charset=utf-8");
						response.setHeader("Content-Disposition", "filename="
								+ new String(fname.getBytes("utf-8"), "8859_1"));
					} else {
						response.setHeader("Content-Type",
								"application/octet-stream; charset=utf-8");
						response.setHeader(
								"Content-Disposition",
								"attachment; filename="
										+ new String(fname.getBytes("utf-8"),
												"8859_1"));
					}//else
					response.setHeader("Content-Transfer-Encoding", "binary;");
					response.setHeader("Content-Length", "" + file.length());
					response.setHeader("Pragma", "no-cache;");
					response.setHeader("Expires", "-1;");

					os = response.getOutputStream();
					byte b[] = new byte[4096];
					int leng = 0;
					while ((leng = in.read(b)) > 0) {
						os.write(b, 0, leng);
					}//while
				} else {
					//out.println("<script language='javascript'>");
					//out.println("alert('File Downloading Fail !!');");
					//out.println("</script>");
					return;
				}//else
			} catch (Exception e) {
				System.out.println(e);
			} finally {
				if (in != null)
					in.close();
				if (os != null)
					os.close();
			}//finally