도도의 초록누리

* apache-tomcat-9.0.37-windows-x64

* Maven - 3.6.3/1.16.0.20200610-1735   - http://maven.apache.org/download.cgi

  (pom.xml)

   - javax.servlet-api 4.0.1

   - commons-io 2.8.0 (apache project)   -  http://commons.apache.org/

   - commons-fileupload 1.4 (apache project)   - http://commons.apache.org/

비고: 대략 초기 Maven Project를 생성하면, 1.6? 1.7 버전으로 셋팅되어 있음.

패키지: com.fileWeb.controller

클래스명: FrontController(java)

https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api 
https://mvnrepository.com/artifact/commons-io/commons-io

https://mvnrepository.com/artifact/commons-fileupload/commons-fileupload

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

  <modelVersion>4.0.0</modelVersion>

  <groupId>com.mavenUpload</groupId>

  <artifactId>web</artifactId>

  <version>0.0.1-SNAPSHOT</version>

  <packaging>war</packaging>

  <name>File - Multi Web Upload Project</name>

  <!-- FIXME change it to the project's website -->

  <url>http://www.example.com</url>

  <properties>

    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

    <maven.compiler.source>1.7</maven.compiler.source>

    <maven.compiler.target>1.7</maven.compiler.target>

  </properties>

  <dependencies>

    <dependency>

      <groupId>junit</groupId>

      <artifactId>junit</artifactId>

      <version>4.11</version>

      <scope>test</scope>

    </dependency>

    <!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->

<dependency>

    <groupId>javax.servlet</groupId>

    <artifactId>javax.servlet-api</artifactId>

    <version>4.0.1</version>

    <scope>provided</scope>

</dependency>

<!-- https://mvnrepository.com/artifact/commons-io/commons-io -->

<dependency>

    <groupId>commons-io</groupId>

    <artifactId>commons-io</artifactId>

    <version>2.8.0</version>

</dependency>

<!-- https://mvnrepository.com/artifact/commons-fileupload/commons-fileupload -->

<dependency>

    <groupId>commons-fileupload</groupId>

    <artifactId>commons-fileupload</artifactId>

    <version>1.4</version>

</dependency>

  </dependencies>

  <build>

    <finalName>web</finalName>

    <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->

      <plugins>

        <plugin>

          <artifactId>maven-clean-plugin</artifactId>

          <version>3.1.0</version>

        </plugin>

        <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->

        <plugin>

          <artifactId>maven-resources-plugin</artifactId>

          <version>3.0.2</version>

        </plugin>

        <plugin>

          <artifactId>maven-compiler-plugin</artifactId>

          <version>3.8.0</version>

        </plugin>

        <plugin>

          <artifactId>maven-surefire-plugin</artifactId>

          <version>2.22.1</version>

        </plugin>

        <plugin>

          <artifactId>maven-war-plugin</artifactId>

          <version>3.2.2</version>

        </plugin>

        <plugin>

          <artifactId>maven-install-plugin</artifactId>

          <version>2.5.2</version>

        </plugin>

        <plugin>

          <artifactId>maven-deploy-plugin</artifactId>

          <version>2.8.2</version>

        </plugin>

      </plugins>

    </pluginManagement>

  </build>

</project>

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 

xmlns="http://java.sun.com/xml/ns/javaee" 

xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" 

id="WebApp_ID" version="3.0">

  <display-name>Archetype Created Web Application</display-name>

  <welcome-file-list>

    <welcome-file>index.html</welcome-file>

    <welcome-file>index.htm</welcome-file>

    <welcome-file>index.do</welcome-file>

    <welcome-file>default.html</welcome-file>

    <welcome-file>default.htm</welcome-file>

    <welcome-file>default.do</welcome-file>

  </welcome-file-list>

  <servlet>

  <servlet-name>FrontController</servlet-name>

  <servlet-class>com.fileWeb.controller.FrontController</servlet-class>

  <init-param>

<param-name>charset</param-name>

<param-value>UTF-8</param-value>

</init-param>

  </servlet>

  <servlet-mapping>

  <servlet-name>FrontController</servlet-name>

  <url-pattern>*.do</url-pattern>

  </servlet-mapping>

</web-app>

패키지명: com.fileWeb.controller

클래스명: HttpUtil (java)

package com.fileWeb.controller;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.io.PrintWriter;

import javax.servlet.RequestDispatcher;

import javax.servlet.ServletConfig;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class HttpUtil extends HttpServlet {

private static final long serialVersionUID = 1L;

private static String charset = null;

public static void forward(HttpServletRequest req, HttpServletResponse res,

String path) throws ServletException, IOException {

try {

RequestDispatcher dispatcher = req.getRequestDispatcher(path);

dispatcher.forward(req, res);

}catch(Exception e) {

e.printStackTrace();

}

}

public static void fileUpload(HttpServletRequest req, HttpServletResponse res,

String path) throws ServletException, IOException {

charset = (String) req.getAttribute("charset");

System.out.println(charset);

PrintWriter out = res.getWriter();

// 파일 업로드된 경로

String root = req.getSession().getServletContext().getRealPath("/");

String savePath = root + "upload" + File.separator + "upload";

// 서버에 실제 저장된 파일명

String filename = "1600955663095" ;

System.out.println("파일 실제 폴더경로:" + savePath);

// 실제 내보낼 파일명

String orgfilename = "license한글.txt" ;

req.setCharacterEncoding(charset);

res.setCharacterEncoding(charset);

InputStream in = null;

OutputStream os = null;

File file = null;

boolean skip = false;

String client = "";

try{

    // 파일을 읽어 스트림에 담기

    try{

        file = new File(savePath, filename);

        in = new FileInputStream(file);

    }catch(FileNotFoundException fe){

        skip = true;

    }

    client = req.getHeader("User-Agent");

    // 파일 다운로드 헤더 지정

    res.reset() ;

    res.setContentType("application/octet-stream");

    res.setHeader("Content-Description", "JSP Generated Data");

    if(!skip){

        // IE

        if(client.indexOf("MSIE") != -1){

            res.setHeader ("Content-Disposition", "attachment; filename="+new String(orgfilename.getBytes("KSC5601"),"ISO8859_1"));

        }else{

            // 한글 파일명 처리

            orgfilename = new String(orgfilename.getBytes("KSC5601"),"iso-8859-1");

            res.setHeader("Content-Disposition", "attachment; filename=\"" + orgfilename + "\"");

            res.setHeader("Content-Type", "application/octet-stream; charset=utf-8");

        }  

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

        os = res.getOutputStream();

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

        int leng = 0;

        while( (leng = in.read(b)) > 0 ){

            os.write(b,0,leng);

        }

    }else{

    // 한글 깨짐 - 해결

    res.setContentType("text/html;charset=" + charset);

        out.println("<html><head>");

        out.println("<script language='javascript'>alert('파일을 찾을 수 없습니다.');history.back();</script>");

        out.println("</head><body></body></html>");

    }

    in.close();

    os.close();

}catch(Exception e){

e.printStackTrace();

}

}

}

package com.fileWeb.controller;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public interface Controller {

public void execute(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException;

}

package com.fileWeb.controller;

import java.io.IOException;

import java.util.HashMap;

import java.util.Map;

import javax.servlet.ServletConfig;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

/**

 * Servlet implementation class HomeController

 */

public class FrontController extends HttpServlet {

private static final long serialVersionUID = 1L;

private String charset = null;

    public FrontController() {

        super();

    }

protected void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {

doAction(req, res);

}

protected void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {

doAction(req, res);

}

// FrontController 패턴 & Command 패턴

protected void doAction(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {

ServletConfig sc = this.getServletConfig();

charset = sc.getInitParameter("charset");

req.setAttribute("charset", charset);

req.setCharacterEncoding(charset);

res.setContentType("text/html; charset=" + charset);

System.out.println(charset);

String uri = req.getRequestURI();

System.out.println("uri : " + uri);

String conPath = req.getContextPath();

System.out.println("conPath : " + conPath);

String command = uri.substring(conPath.length());

System.out.println("command : " + command);

Controller subController = null;

System.out.println("reqMapSize : " + req.getParameterMap().size());

if(command.equals("/board/insert.do")){

System.out.println("insert");

System.out.println("----------------");

    subController = new BoardInsertController();

    subController.execute(req, res);

}else if (command.equals("/board/insertResult.do")) {

System.out.println("insertResult");

System.out.println("----------------");

    subController = new BoardInsertResultController();

subController.execute(req, res);

}

else if(command.equals("/board/insertMultiResult.do")){

System.out.println("insertResult");

System.out.println("----------------");

    subController = new BoardInsertMultiResultController();

subController.execute(req, res);

}else if(command.equals("/board/download.do")) {

System.out.println("download");

System.out.println("----------------");

    HttpUtil.fileUpload(req, res, null);

}else if(command.equals("/board/update.do")){

System.out.println("update");

System.out.println("----------------");

}else if(command.equals("/board/select.do")){

System.out.println("select");

System.out.println("----------------");

}else if(command.equals("/board/delete.do")){

System.out.println("delete");

System.out.println("----------------");

}

}

}

package com.fileWeb.controller;

import java.io.IOException;

import java.util.HashMap;

import java.util.Map;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class BoardInsertController implements Controller {

@Override

public void execute(HttpServletRequest req, HttpServletResponse res) throws

ServletException, IOException {

HttpUtil.forward(req, res, "/WEB-INF/view/board/insert.jsp");

}

}

실험 결과를 먼저 소개하면, 

1. multipart/form-data를 정의해버리면, 기본 정의된 request로는 parameter를 전송받을 수가 없다.

* com.oreilly.servlet   (결과: 오래된 프로젝트 / 서블릿 버전 충돌 발생)

  - http://www.servlets.com/cos/

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<!DOCTYPE html>

<html>

<head>

<meta charset="UTF-8">

<title>삽입</title>

</head>

<body>

<h3>삽입</h3>

<!-- 파일 업로드 화면 -->

<!-- 일반적으로 Multipart form으로 전송된 데이터는

      일반 request 메서드로 받아올 수 없습니다.  enctype="multipart/form-data" -->

<form method="post" action="insertResult.do" >

<table style="width:700px;border:1px solid #e2e2e2;">

<tr>

<td style="width:20%">

파일명

</td>

<td>

<input type="text" name="usrID" size="10">

<input type="file" name="uploadFile" multiple>

</td>

</tr>

<tr>

<td colspan="2">

<input type="submit" value="전송">

</td>

</tr>

</table>

</form>

<!-- 멀티파트/데이터 전송 -->

<form method="post" action="insertMultiResult.do" enctype="multipart/form-data" >

<table style="width:700px;border:1px solid #e2e2e2;">

<tr>

<td style="width:20%">

파일명

</td>

<td>

<input type="text" name="usrID" size="10">

<input type="password" name="usrPasswd" size="10">

<input type="file" name="uploadFile" multiple>

<input type="file" name="uploadFile" multiple>

<input type="file" name="uploadFile" multiple>

</td>

</tr>

<tr>

<td colspan="2">

<input type="submit" value="전송">

</td>

</tr>

</table>

</form>

</body>

</html>

package com.fileWeb.controller;

import java.io.IOException;

import java.util.HashMap;

import java.util.Map;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class BoardInsertResultController implements Controller {

@Override

public void execute(HttpServletRequest req, HttpServletResponse res) throws

ServletException, IOException {

Map<String, Object> reqMap = new HashMap<String, Object>();

reqMap.put("usrID", req.getParameter("usrID"));

reqMap.put("usrPasswd", req.getParameter("filename"));

            req.setAttribute("reqMap", reqMap);

HttpUtil.forward(req, res, "/WEB-INF/view/board/insertResult.jsp");

}

}

- [JSP] 12. Jsp/Servlet(MVC) Maven 기반의 다중 파일 업로드, 다운로드 구현(2), 2020-09-24

   https://yyman.tistory.com/1415

[작업 환경]

* 웹 서버: Apache-tomcat-9.0.37-windows-x64

* IDE: Spring-Tool-Suite 4-4.7.2. Releases.

* Eclipse Marketplace: STS 검색 후 Spring Tools 3 Add-On for Spring Tools 4 3.9.14.Release 설치할 것

* POM 라이브러리: 

  - Apache Commons IO 2.8.0 (2020. 09)

  - Apache Commons FileUpload (2018. 12)

* C태그(JSTL)

(중략)

<!-- Servlet -->

<!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->

<dependency>

    <groupId>javax.servlet</groupId>

    <artifactId>javax.servlet-api</artifactId>

    <version>4.0.1</version>

    <scope>provided</scope>

</dependency>

<dependency>

<groupId>javax.servlet.jsp</groupId>

<artifactId>jsp-api</artifactId>

<version>2.1</version>

<scope>provided</scope>

</dependency>

<dependency>

<groupId>javax.servlet</groupId>

<artifactId>jstl</artifactId>

<version>1.2</version>

</dependency>

<!-- https://mvnrepository.com/artifact/commons-io/commons-io -->

<dependency>

    <groupId>commons-io</groupId>

    <artifactId>commons-io</artifactId>

    <version>2.8.0</version>

</dependency>

<!-- https://mvnrepository.com/artifact/commons-fileupload/commons-fileupload -->

<dependency>

    <groupId>commons-fileupload</groupId>

    <artifactId>commons-fileupload</artifactId>

    <version>1.4</version>

</dependency>

(중략)

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"

version="3.1">

(중략)

경로: /src/main/webapp/WEB-INF/spring/appServlet/

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns:context="http://www.springframework.org/schema/context" 

xmlns:p="http://www.springframework.org/schema/p" 

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 

xmlns="http://www.springframework.org/schema/beans" 

xmlns:mvc="http://www.springframework.org/schema/mvc" 

xmlns:cache="http://www.springframework.org/schema/cache" 

xmlns:aop="http://www.springframework.org/schema/aop" 

xsi:schemaLocation="http://www.springframework.org/schema/beans 

http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 

http://www.springframework.org/schema/context 

http://www.springframework.org/schema/context/spring-context-3.0.xsd 

http://www.springframework.org/schema/mvc 

http://www.springframework.org/schema/mvc/spring-mvc.xsd 

http://www.springframework.org/schema/cache 

http://www.springframework.org/schema/cache/spring-cache.xsd">

<!-- MultipartResolver 설정 --> 

<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> 

<property name="maxUploadSize" value="100000000" /> 

<property name="maxInMemorySize" value="100000000" /> 

</bean>

</beans>

[비고]

파일 크기의 제한을 두기 위한 코드이다.

예: 최대 업로드 파일 크기는 20MB, 메모리에 최대로 저장할 수 있는 파일 크기는 10MB로 제한함.

1MB = 1,024KB

10MB = 10,485,760KB(1,024*1,024*10)

20MB = 20,971,520KB(1,024*1,024*20)

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"

version="3.1">

<!-- The definition of the Root Spring Container shared by all Servlets and Filters -->

<context-param>

<param-name>contextConfigLocation</param-name>

<param-value>/WEB-INF/spring/root-context.xml</param-value>

</context-param>

<!-- Creates the Spring Container shared by all Servlets and Filters -->

<listener>

<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>

</listener>

<!-- Processes application requests -->

<servlet>

<servlet-name>appServlet</servlet-name>

<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

<init-param>

<param-name>contextConfigLocation</param-name>

<param-value>

/WEB-INF/spring/appServlet/servlet-context.xml

/WEB-INF/spring/appServlet/context-common.xml

</param-value>

</init-param>

<load-on-startup>1</load-on-startup>

</servlet>

<servlet-mapping>

<servlet-name>appServlet</servlet-name>

<url-pattern>/</url-pattern>

</servlet-mapping>

<!-- UTF-8 -->

<filter>

<filter-name>encodingFilter</filter-name>

<filter-class>

org.springframework.web.filter.CharacterEncodingFilter

</filter-class>

<init-param>

<param-name>encoding</param-name>

<param-value>UTF-8</param-value>

</init-param> <init-param>

<param-name>forceEncoding</param-name>

<param-value>true</param-value>

</init-param>

</filter>

<filter-mapping>

<filter-name>encodingFilter</filter-name>

<url-pattern>/*</url-pattern>

</filter-mapping>

</web-app>

* 패키지 경로: com.example.postget.vo

package com.example.postget.vo;

public class MemberVO {

private int num;

private String id;

private String passwd;

private String address;

public int getNum() {

return num;

}

public void setNum(int num) {

this.num = num;

}

public String getId() {

return id;

}

public void setId(String id) {

this.id = id;

}

public String getPasswd() {

return passwd;

}

public void setPasswd(String passwd) {

this.passwd = passwd;

}

public String getAddress() {

return address;

}

public void setAddress(String address) {

this.address = address;

}

}

* 패키지 경로: com.example.postget.controller

POST 방식으로 업로드 처리에 관한 것이다.

(중략)

@RequestMapping(value = "uploadResult", method = RequestMethod.POST)

public String uploadResult(Model model, MemberVO memberVO, MultipartHttpServletRequest request) {

     // 루트 경로

           String rootUploadDir = "C:"+File.separator+"Upload"; // C:/Upload

           File dir = new File(rootUploadDir + File.separator + "testfile"); 

           if(!dir.exists()) { //업로드 디렉토리가 존재하지 않으면 생성

                dir.mkdirs();

           }

     Iterator<String> iterator = request.getFileNames(); // 다중 업로드 지원

           ArrayList<String> list = new ArrayList<String>();

           int fileLoop = 0;

           String uploadFileName;

           MultipartFile mFile = null;

           String orgFileName = ""; // 진짜 파일명

           String sysFileName = ""; // 변환된 파일명

            list.add("루트경로:" + dir + File.separator );

            while(iterator.hasNext()) {

                 fileLoop++;

                 uploadFileName = iterator.next();

                 mFile = request.getFile(uploadFileName);

                 orgFileName = mFile.getOriginalFilename();

                 logger.info(orgFileName);

                 if(orgFileName != null && orgFileName.length() != 0) { //sysFileName 생성

                   SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyyMMDDHHmmss-" + fileLoop);

                   Calendar calendar = Calendar.getInstance();

                   sysFileName = simpleDateFormat.format(calendar.getTime()); //sysFileName: 날짜-fileLoop번호

                    try {

                        logger.info("try 진입");

                        mFile.transferTo(new File(dir + File.separator + sysFileName)); // C:/Upload/testfile/sysFileName

                        list.add("원본파일명: " + orgFileName + ", 시스템파일명: " + sysFileName);

                        list.add("파일크기: " + mFile.getSize() + ", 파일형식: " + mFile.getContentType() );

                    }catch(Exception e){

                         list.add("오류: 파일 업로드 중 에러발생!!!");

                    }

                }//if

            }//while

            model.addAttribute("list", list);

return "/board/uploadResult";

}

(중략)

<!-- 파일 업로드 영역 -->

<h3>파일 업로드</h3>

<form method="POST" action="uploadResult" enctype="multipart/form-data">

<table style="width:900px; height:70px;">

<tr>

<td style="width:10%">아이디(UserID)</td>

<td style="width:90%">

<input type="text" name="id" class="login_id">

</td>

</tr>

<tr>

<td>

비밀번호(Password)

</td>

<td>

<input type="password" name="passwd" class="login_pwd">

</td>

</tr>

<tr>

<td colspan="2">

<input type="file" name="uploadFile" multiple>

</td>

</tr>

<tr>

<td colspan="2">

<input type="submit" value="로그인">

</td>

</tr>

</table>

</form>

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>

<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt"%>

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<!DOCTYPE html>

<html>

<head>

<meta charset="UTF-8">

<title>업로드 - 결과</title>

</head>

<body>

<!-- 업로드 결과 (출력) -->

<c:set var="i" value="1" />

<c:set var="num" value="1" />

<table style="width:700px; border:1px;">

<c:forEach items="${list}" var="list">

<c:choose>

<c:when test="${i == 1}">

<tr>

<td colspan="2" style="background-color:#e2e2e2;">

<c:out value="${num}" />

</td>

</tr>

</c:when>

</c:choose>

<c:choose>

<c:when test="${i <= 3}">

<tr>

<td><c:out value="${i}" /></td>

<td>${list}</td>

<c:set var="i" value="${i + 1}" />

</tr>

</c:when>

<c:otherwise>

<c:set var="i" value="1" />

<c:set var="num" value="${num + 1}" />

</c:otherwise>

</c:choose>

</c:forEach>

</table>

</body>

</html>