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package com.hoge;
 
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.List;
 
import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
import org.apache.tomcat.util.http.fileupload.FileItem;
import org.apache.tomcat.util.http.fileupload.FileUploadException;
import org.apache.tomcat.util.http.fileupload.disk.DiskFileItemFactory;
import org.apache.tomcat.util.http.fileupload.servlet.ServletFileUpload;
 
/**
 * Servlet implementation class FileUploadServlet
 */
@WebServlet("/FileUploadServlet")
public class FileUploadServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
	private String uploadDirectoryString = "upload";
	private File storeFile;
	/**
	 * @see HttpServlet#HttpServlet()
	 */
	public FileUploadServlet() {
		super();
		// TODO Auto-generated constructor stub
	}
 
	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
	}
 
	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 
		if(ServletFileUpload.isMultipartContent(request)) {
 
			DiskFileItemFactory factory = new DiskFileItemFactory();
			factory.setSizeThreshold(1024);
			ServletFileUpload upload = new ServletFileUpload(factory);
			upload.setSizeMax(-1);
			upload.setFileSizeMax(-1);
 
			List<FileItem> items = null;
			try {
				items = upload.parseRequest(request);
			} catch (FileUploadException e) {
				e.printStackTrace();
			}
 
			for(FileItem item : items) {
				if(item.isFormField()) {
				} else {
					writeFile(item);
					showThumbnail(request, response);
				}
			}
		}
	}
 
	private void showThumbnail(HttpServletRequest request, HttpServletResponse response) throws IOException {
		BufferedImage image = ImageIO.read(storeFile);
		response.setContentType("image/jpg");
		ServletOutputStream out = response.getOutputStream();
		ImageIO.write(image, "jpg", out);
		out.close();
	}
 
	private void writeFile(FileItem item) {
		try {
			String uploadPath = getServletContext().getRealPath("") + File.separator + uploadDirectoryString;
			File uploadDirectory = new File(uploadPath);
			if(!uploadDirectory.exists()) uploadDirectory.mkdir();
			String fileName = new File(item.getName()).getName();
			String filePath = uploadPath + File.separator + fileName;
			storeFile = new File(filePath);
			item.write(storeFile);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
 
}
 

Main.java:25: error: class FileUploadServlet is public, should be declared in a file named FileUploadServlet.java
public class FileUploadServlet extends HttpServlet {
       ^
Main.java:9: error: package javax.servlet does not exist
import javax.servlet.ServletException;
                    ^
Main.java:10: error: package javax.servlet does not exist
import javax.servlet.ServletOutputStream;
                    ^
Main.java:11: error: package javax.servlet.annotation does not exist
import javax.servlet.annotation.WebServlet;
                               ^
Main.java:12: error: package javax.servlet.http does not exist
import javax.servlet.http.HttpServlet;
                         ^
Main.java:13: error: package javax.servlet.http does not exist
import javax.servlet.http.HttpServletRequest;
                         ^
Main.java:14: error: package javax.servlet.http does not exist
import javax.servlet.http.HttpServletResponse;
                         ^
Main.java:16: error: package org.apache.tomcat.util.http.fileupload does not exist
import org.apache.tomcat.util.http.fileupload.FileItem;
                                             ^
Main.java:17: error: package org.apache.tomcat.util.http.fileupload does not exist
import org.apache.tomcat.util.http.fileupload.FileUploadException;
                                             ^
Main.java:18: error: package org.apache.tomcat.util.http.fileupload.disk does not exist
import org.apache.tomcat.util.http.fileupload.disk.DiskFileItemFactory;
                                                  ^
Main.java:19: error: package org.apache.tomcat.util.http.fileupload.servlet does not exist
import org.apache.tomcat.util.http.fileupload.servlet.ServletFileUpload;
                                                     ^
Main.java:25: error: cannot find symbol
public class FileUploadServlet extends HttpServlet {
                                       ^
  symbol: class HttpServlet
Main.java:24: error: cannot find symbol
@WebServlet("/FileUploadServlet")
 ^
  symbol: class WebServlet
Main.java:40: error: cannot find symbol
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
	                     ^
  symbol:   class HttpServletRequest
  location: class FileUploadServlet
Main.java:40: error: cannot find symbol
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
	                                                 ^
  symbol:   class HttpServletResponse
  location: class FileUploadServlet
Main.java:40: error: cannot find symbol
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
	                                                                                      ^
  symbol:   class ServletException
  location: class FileUploadServlet
Main.java:47: error: cannot find symbol
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
	                      ^
  symbol:   class HttpServletRequest
  location: class FileUploadServlet
Main.java:47: error: cannot find symbol
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
	                                                  ^
  symbol:   class HttpServletResponse
  location: class FileUploadServlet
Main.java:47: error: cannot find symbol
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
	                                                                                       ^
  symbol:   class ServletException
  location: class FileUploadServlet
Main.java:74: error: cannot find symbol
	private void showThumbnail(HttpServletRequest request, HttpServletResponse response) throws IOException {
	                           ^
  symbol:   class HttpServletRequest
  location: class FileUploadServlet
Main.java:74: error: cannot find symbol
	private void showThumbnail(HttpServletRequest request, HttpServletResponse response) throws IOException {
	                                                       ^
  symbol:   class HttpServletResponse
  location: class FileUploadServlet
Main.java:82: error: cannot find symbol
	private void writeFile(FileItem item) {
	                       ^
  symbol:   class FileItem
  location: class FileUploadServlet
Main.java:49: error: cannot find symbol
		if(ServletFileUpload.isMultipartContent(request)) {
		   ^
  symbol:   variable ServletFileUpload
  location: class FileUploadServlet
Main.java:51: error: cannot find symbol
			DiskFileItemFactory factory = new DiskFileItemFactory();
			^
  symbol:   class DiskFileItemFactory
  location: class FileUploadServlet
Main.java:51: error: cannot find symbol
			DiskFileItemFactory factory = new DiskFileItemFactory();
			                                  ^
  symbol:   class DiskFileItemFactory
  location: class FileUploadServlet
Main.java:53: error: cannot find symbol
			ServletFileUpload upload = new ServletFileUpload(factory);
			^
  symbol:   class ServletFileUpload
  location: class FileUploadServlet
Main.java:53: error: cannot find symbol
			ServletFileUpload upload = new ServletFileUpload(factory);
			                               ^
  symbol:   class ServletFileUpload
  location: class FileUploadServlet
Main.java:57: error: cannot find symbol
			List<FileItem> items = null;
			     ^
  symbol:   class FileItem
  location: class FileUploadServlet
Main.java:60: error: cannot find symbol
			} catch (FileUploadException e) {
			         ^
  symbol:   class FileUploadException
  location: class FileUploadServlet
Main.java:64: error: cannot find symbol
			for(FileItem item : items) {
			    ^
  symbol:   class FileItem
  location: class FileUploadServlet
Main.java:77: error: cannot find symbol
		ServletOutputStream out = response.getOutputStream();
		^
  symbol:   class ServletOutputStream
  location: class FileUploadServlet
Main.java:84: error: cannot find symbol
			String uploadPath = getServletContext().getRealPath("") + File.separator + uploadDirectoryString;
			                    ^
  symbol:   method getServletContext()
  location: class FileUploadServlet
32 errors

Standard output is empty