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java 21.0.4 2024-07-16 LTSJava(TM) SE Runtime Environment (build 21.0.4+8-LTS-274)
Java HotSpot(TM) 64-Bit Server VM (build 21.0.4+8-LTS-274, mixed mode, sharing)
Tomcatv 10.1
EclipseVersion: 2024-06 (4.32.0)Build id: 20240606-1231
pom.xml
dependency: "commons-fileupload2-jakarta-servlet6"를 추가합니다.
<!--https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>6.1.11</version>
</dependency>
<!--https://mvnrepository.com/artifact/org.springframework/spring-context -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>6.1.11</version>
</dependency>
<!--https://mvnrepository.com/artifact/jakarta.servlet/jakarta.servlet-api -->
<dependency>
<groupId>jakarta.servlet</groupId>
<artifactId>jakarta.servlet-api</artifactId>
<version>6.0.0</version>
<scope>provided</scope> <!-- 배포 시에는 포함되지 않습니다. -->
</dependency>
<!--https://mvnrepository.com/artifact/jakarta.servlet.jsp.jstl/jakarta.servlet.jsp.jstl-api -->
<dependency>
<groupId>jakarta.servlet.jsp.jstl</groupId>
<artifactId>jakarta.servlet.jsp.jstl-api</artifactId>
<version>3.0.0</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.glassfish.web/jakarta.servlet.jsp.jstl -->
<dependency>
<groupId>org.glassfish.web</groupId>
<artifactId>jakarta.servlet.jsp.jstl</artifactId>
<version>3.0.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.commons/commons-fileupload2-jakarta-servlet6 -->
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-fileupload2-jakarta-servlet6</artifactId>
<version>2.0.0-M2</version>
</dependency>
web.xml
"<multipart-config>" 설정을 추가합니다.
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="https://jakarta.ee/xml/ns/jakartaee"
xsi:schemaLocation="https://jakarta.ee/xml/ns/jakartaee https://jakarta.ee/xml/ns/jakartaee/web-app_5_0.xsd"
id="WebApp_ID" version="5.0">
<display-name>COM.FILE</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.jsp</welcome-file>
<welcome-file>default.htm</welcome-file>
</welcome-file-list>
<!-- ContextLoaderListener -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</context-param>
<!-- DispatcherServlet -->
<servlet>
<servlet-name>dispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:dispatcherServlet.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
<multipart-config>
<location>/tmp</location> <!-- 임시 파일 저장 경로 -->
<max-file-size>5242880</max-file-size> <!-- 파일당 최대 크기 5MB -->
<max-request-size>20971520</max-request-size> <!-- 전체 요청 최대 크기 20MB -->
<file-size-threshold>0</file-size-threshold>
</multipart-config>
</servlet>
<servlet-mapping>
<servlet-name>dispatcherServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<!-- 한글 깨짐 설정(텍스트 인코딩) -->
<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>
Controller
FileManagement.java 파일을 생성합니다.
package com.file.controller;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.UUID;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.servlet.ModelAndView;
import jakarta.servlet.ServletOutputStream;
import jakarta.servlet.http.HttpServletResponse;
@Controller
public class FileManagement {
// 파일 확장자를 추출하는 메서드
private String getFileExtension(String fileName) {
if (fileName != null && fileName.contains(".")) {
return fileName.substring(fileName.lastIndexOf(".") + 1);
}
return "";
}
@RequestMapping(value="/fileUpload", method=RequestMethod.GET)
public String fileUploadGet() {
return "fileUpload";
}
@RequestMapping(value="/fileUpload", method=RequestMethod.POST)
public ModelAndView fileUploadPost(@RequestParam("files") MultipartFile[] files) {
// if (files.length == 0) {
// 업로드할 파일을 선택해주세요.
// }
ModelAndView modelAndView = new ModelAndView("fileUpload");
String uploadDir = "/Users/jangjeonghun/eclipse-workspace/uploadedFiles";
List<String> failedFiles = new ArrayList<String>();
List<String> allowedExtensions = Arrays.asList("jpg", "jpeg", "png", "gif", "pdf");
for (MultipartFile file : files) {
if (file.isEmpty()) {
continue;
}
try {
Path uploadPath = Paths.get(uploadDir);
if (!Files.exists(uploadPath)) {
Files.createDirectories(uploadPath);
}
String originalFileName = file.getOriginalFilename();
String fileExtension = getFileExtension(originalFileName);
// 확장자 제한 체크
if (!allowedExtensions.contains(fileExtension.toLowerCase())) {
failedFiles.add(String.format("%s(허용되지 않는 확장자 파일)", originalFileName));
continue;
}
// 파일명 중복 방지
String uniqueFileName = String.format("%s_%s", UUID.randomUUID().toString(), originalFileName);
// 파일 저장
Path filePath = uploadPath.resolve(uniqueFileName);
Files.copy(file.getInputStream(), filePath);
modelAndView.addObject("fileName", uniqueFileName);
} catch (IOException e) {
e.printStackTrace();
failedFiles.add(String.format("%s(업로드 실패)", file.getOriginalFilename()));
}
}
if(failedFiles.isEmpty()) {
modelAndView.addObject("message", "파일 업로드가 완료 되었습니다.");
} else {
modelAndView.addObject("message", String.join(",", failedFiles));
}
return modelAndView;
}
@RequestMapping(value="/fileDownload", method=RequestMethod.GET)
public void fileDownload(
@RequestParam("fileName") String fileName,
HttpServletResponse response
) throws Exception {
String downloadFile = "/Users/jangjeonghun/eclipse-workspace/uploadedFiles/" + fileName;
ServletOutputStream out = response.getOutputStream();
File file = new File(downloadFile);
response.setHeader("Cache-Control", "no-cache");
response.setHeader("Content-disposition", "attachment; fileName="+fileName);
FileInputStream in = new FileInputStream(file);
byte[] buffer = new byte[1024 * 8];
while(true) {
int count = in.read(buffer);
if(count == -1) { break; }
out.write(buffer, 0, count);
}
in.close();
out.close();
}
}
View
fileUpload.jsp 파일을 생성합니다.
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" isELIgnored="false" %>
<%@ taglib prefix="c" uri="jakarta.tags.core"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>파일 업로</title>
</head>
<body>
<h1>this is a file page.</h1>
<h1 style="color:red">${ message }</h1>
<form action="${ contextPath }/fileUpload" method="post" enctype="multipart/form-data">
<label>파일</label><br><br>
<input type="file" name="files" multiple /><br><br>
<!-- <input type="file" name="files" /><br><br> -->
<input type="submit" value="send data" />
</form>
<br>
fileName= ${ fileName }
<c:if test="${ not empty fileName }">
<img src="/fileDownload?fileName=${ fileName }" />
</c:if>
</body>
</html>
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