index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>File</title>
<script src="https://code.jquery.com/jquery-3.5.0.js"></script>
</head>
<body>
	<form action="upload.file" method="post" enctype="multipart/form-data">
		<input type=file name="file">
		<input type=submit value="업로드">
	</form>
</body>
</html>

 

 

request는 가방

텍스트부분과 파일 부분을 구분 하기 위해 파트를 나눈다 : multipart

 

서버 측에서 꺼내는 방법

 

 

라이브러리 필요

http://servlets.com/cos/

 

Servlets.com | com.oreilly.servlet

 

servlets.com

cos-20.08.zip
0.27MB

cos.jar : 세미프로젝트 단계에서 적당

 

fileController.java

package kh.backend.controller;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.oreilly.servlet.MultipartRequest;


@WebServlet(".file")
public class fileController extends HttpServlet {

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

		String requestURI = request.getRequestURI();
		String ctxPath = request.getContextPath();
		String cmd = requestURI.substring(ctxPath.length());
		
		String uploadPath = request.getServletContext().getRealPath("upload");
		
		System.out.println("저장 경로 : "+ uploadPath );
		
		
//		if(cmd.contentEquals("/upload.file")) {
//			MutipartRequest multi = new MultipartRequest(
//					request,
//					uploadPath
//					
//					);
//		}
		
	}


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

}

 

 

수정한 내용/ 업로드한 이미지가 바로 적용되지 않는 경우

프로젝트 경로에 있어도 실행시 복사가 안되면 실행되지 않음

 

RealPath는 실행되는 진짜 위치를 말한다

 

index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>File</title>
<script src="https://code.jquery.com/jquery-3.5.0.js"></script>
</head>
<body>
	<form action="upload.file" method="post" enctype="multipart/form-data">
		<input type=file name="file">
		<input type=submit value="업로드">
	</form>
</body>
</html>
package kh.backend.controller;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.oreilly.servlet.MultipartRequest;


@WebServlet("*.file")
public class fileController extends HttpServlet {

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

		String requestURI = request.getRequestURI();
		String ctxPath = request.getContextPath();
		String cmd = requestURI.substring(ctxPath.length());
		
		String uploadPath = request.getServletContext().getRealPath("upload");
		
		System.out.println("저장 경로 : "+ uploadPath );
		
		
//		if(cmd.contentEquals("/upload.file")) {
//			MutipartRequest multi = new MultipartRequest(
//					request,
//					uploadPath
//					
//					);
//		}
		
	}


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

}

 

upload라는 파일 없음

		String uploadPath = request.getServletContext().getRealPath("upload");

		if(!uploadPathF.exists()) { //경로가 없다면
			uploadPathF.mkdir();    //만들어라
		}
package kh.backend.controller;

import java.io.File;
import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.oreilly.servlet.MultipartRequest;
import com.oreilly.servlet.multipart.DefaultFileRenamePolicy;

@WebServlet("*.file")
public class fileController extends HttpServlet {

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


		String requestURI = request.getRequestURI();
		String ctxPath = request.getContextPath();
		String cmd = requestURI.substring(ctxPath.length());
		
		String uploadPath = request.getServletContext().getRealPath("upload");
		
		File uploadPathF = new File(uploadPath);
		
		if(!uploadPathF.exists()) { //경로가 없다면
			uploadPathF.mkdir();    //만들어라
		}
		
		System.out.println("저장 경로 : "+ uploadPath );
		
		
		if(cmd.contentEquals("/upload.file")) {
			MultipartRequest multi = new MultipartRequest(
					request,
					uploadPath,
					1024*1024*10, //사이즈
					"utf8", //인코딩
					new DefaultFileRenamePolicy() // 이름 겹치면 덮어씌워짐 -> 중복 방지 필요 : 처리코드를 직접 쓸수도 있지만, 디폴트값으로
					);
		}
		
	}


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

}

 

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