jsp 파일 업로드/다운로드 구현

//업로드

String subject = null;
String content = null;
String fileName = null;
 // 절대 경로
 String savePath = getServletContext().getRealPath("/saveFile//");
 ServletContext context = getServletContext();
 String absFolder = context.getRealPath(savePath);   //절대경로를 구하는 부분
 int maxSize = 5 * 1024 * 1024; // 최대 업로드 파일 크기 5MB(메가)로 제한
 try {
  MultipartRequest multi = new MultipartRequest(request, savePath, maxSize, "euc-kr", new DefaultFileRenamePolicy());
  subject = multi.getParameter("subject");
  content = multi.getParameter("content");
  fileName = multi.getFilesystemName("notice_file"); // 파일의 이름 얻기
  System.out.println(fileName);
 } catch (Exception e) {
  out.print("예외 발생 : " + e);
 }//catch

//다운로드

<%@ page contentType="text/html; charset=euc-kr" %>
<%@ page import="java.io.*" %>
<%
String filename = new String((request.getParameter("fileName")).getBytes("8859_1"),"EUC_KR");
String  filePath = getServletContext().getRealPath("/saveFile//"); // 절대경로.
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"),"euc-kr");

 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("euc-kr"),"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=euc-kr");
   response.setHeader("Content-Disposition", "filename="+new String(fname.getBytes("euc-kr"),"8859_1"));
  } else {
   response.setHeader("Content-Type", "application/octet-stream; charset=euc-kr");
   response.setHeader("Content-Disposition", "attachment; filename="+new String(fname.getBytes("euc-kr"),"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
%>