filedown

package com.java.fileup;

import java.io.BufferedInputStream;

import java.io.BufferedOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

 public class Download extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet {

  protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

  execute(request, response);

}  

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

execute(request, response);

}        

//사용자정의 함수---------------------------------------------------------------------------

protected void execute(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

String path = getServletContext().getRealPath("/storage");  //서비스항목으로 위치 찾기

String filename = new String(request.getParameter("clip").getBytes("8859_1"),"euckr");

String originalfilename = new String(request.getParameter("original").getBytes("8859_1"),"euckr");

File file = new File(path + "/" + filename);

System.out.println("파일경로 : " + file);

setHeaderType(response, file,originalfilename);

transport(new FileInputStream(file), response.getOutputStream(), file);

}

//파일의 이름, 용량, 파일의 타입(이미지,음악,텍스트....) : 사용자정의함수----------------

private void setHeaderType(HttpServletResponse response, File file,String originalfilename)

{

String mime = getServletContext().getMimeType(file.toString());

if(mime != null)mime = "application/octet-stream";

response.setContentType(mime);

response.setHeader("Content-Disposition",

                         "attachment;filename=" + K2E(replace(originalfilename)));

response.setHeader("Content-Length", ""+file.length());

}

//파일전송 : 사용자정의함수----------------------------------------------------------------

private void transport(InputStream in, OutputStream out, File file)

throws IOException

{

BufferedInputStream  bin = null;

BufferedOutputStream bos = null;

try{

bin = new BufferedInputStream(in);

bos = new BufferedOutputStream(out);

byte [] buf = new byte[(int) file.length()];

int read=0;

while((read = bin.read(buf))  != -1)

{

bos.write(buf, 0, read);                //객체, 시작(offset),길이

}

}catch(Exception e){

System.out.println("transport error : " + e);

}finally{

bos.close();

bin.close();

}

}

 ///////////////////////////////////////////////////////////////////////

public String K2E(String  str)

{

String tmp = null;

try{

tmp = new String (str.getBytes("euckr"), "8859_1");

}catch(Exception e){ }

return tmp;

}

 

////파일이름에 .이 있는 경우 [] 붙는거 방지////////////////////////////

// subject는 파일이름

// replace() 파일을 받을시 '.'이 [].으로 변경을 방지..

public String replace(String subject)

{

String replaced="";

int index=0;

StringBuffer st=new StringBuffer();

index=subject.lastIndexOf(".");

replaced=new String(subject.substring(0,index));

//           '.'    =>    UTF-8 code    =>   '%2e'

replaced=replaced.replaceAll("\\.","%2e");

st.append(replaced);

st.append(subject.subSequence(index,subject.length()));

return st.toString();

}

 }