library 추가, temp와 upload폴더, MultipartTest.html생성
MultipartTest.html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>파일 업로드</title>
</head>
<body>
<h3>파일 업로드 POST 요청 : Multipart 인코딩</h3>
<p>입력폼의 method를 POST로 지정하고,
enctype 속성의 값을 multipart/form-data로 설정
</p>
<form action="FileUploadServlet" method="post"
enctype="multipart/form-data">
사진: <input type="file" name="photo"><br>
설명: <textarea name="description" cols="50" rows="3"></textarea><br>
<input type="submit" value="추가"><br>
</form>
</body>
</html>FileUploadServlet
package lesson02.file;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Iterator;
import java.util.List;
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 org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
/*
/WEB-INF/temp 는 임시 폴더 (외부에서 접근 못하게 하기 위해 web-inf 안에 두었다.)
/upload는 모든 파일 정보를 수신하면 temp -> upload로 이동
*/
@SuppressWarnings("serial")
@WebServlet("/FileUploadServlet")
public class FileUploadServlet extends HttpServlet{
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// 응답데이터를 UTF-8로 해석하자
req.setCharacterEncoding("UTF-8");
// 전송데이터를 UTF-8로 해석하도록 하자
resp.setContentType("text/html; charset=UTF-8");
// 클라이언트와 연결된 통신객체
PrintWriter out = resp.getWriter();
out.println("<html><head><title>Multipart Test" +
"</title></head><body>");
try {
String contextRootPath =
this.getServletContext().getRealPath("/");
System.out.println("contextRootPath : " + contextRootPath);
DiskFileItemFactory diskFactory = new DiskFileItemFactory();
diskFactory.setRepository(
new File(contextRootPath + "/WEB-INF/temp"));
ServletFileUpload upload = new ServletFileUpload(diskFactory);
@SuppressWarnings("unchecked")
List<FileItem> items = upload.parseRequest(req);
FileItem item = null;
for(int i=0;i<items.size();i++) {
item = items.get(i);
if(item.isFormField()) // 일반 전달변수
processFormField(out, item);
else // 업로드 파일
processUploadFile(out, item, contextRootPath);
}
// List items = upload.parseRequest(req);
// Iterator iterator = items.iterator();
// FileItem item = null;
// while(iterator.hasNext()) {
// item = (FileItem)iterator.next();
// if(item.isFormField())
// processFormField(out, item);
// else
// processUploadFile(out, item, contextRootPath);
// }
}catch(Exception e) {
out.println("<pre>");
e.printStackTrace(out);
out.println("</pre>");
}
out.println("</body></html>");
}
private void processUploadFile(
PrintWriter out, FileItem item, String contextRootPath)
throws Exception{
String name = item.getFieldName();
String fileName = item.getName();
String contentType = item.getContentType();
long fileSize = item.getSize();
String uploadedFileName = System.currentTimeMillis() +
fileName.substring(fileName.lastIndexOf("."));
File uploadedFile = new File(
contextRootPath + "/upload/" + uploadedFileName);
item.write(uploadedFile);
// 클라이언트한테 정보보여주기
out.println("<p>");
out.println("파라미터 이름: " + name + "<br>");
out.println("파일 이름: " + fileName + "<br>");
out.println("콘텐츠 타입: " + contentType + "<br>");
out.println("파일 크기: " + fileSize + "<br>");
out.println("<img src='./upload/" + uploadedFileName
+ "' width='500'><br>");
out.println("</p>");
}
private void processFormField(PrintWriter out, FileItem item)
throws Exception{
String name = item.getFieldName();
String value = item.getString("UTF-8");
out.println(name + ":" + value + "<br>");
}
}
파일은 eclipse 안의 upload 폴더가 아니라 tomcat 안의 폴더에 올라가는 것이다.
/Users/jenna/Desktop/Programming/Servlet_JSP/lecture/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/_03_Http/upload
