File upload example using servlet and Jsp


Environment used:
JDK 1.8
Eclipse Luna
Web module 2.5
Tomcat 8(requires javax.servlet.3.1 jar)
        commons-io-2.4.jar
        commons-fileupload-1.2.2.jar

Step 1:
Create an html file with file upload option
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
	<form method="post" action="upload" enctype="multipart/form-data">
		Choose a file : <input type="file" name="file"> <input
			type="submit" value="upload">
	</form>
</body>
</html>

Step 2:
Create a Servlet program
1. Checks the request type
2. Get the file name, size , content type and content from FileItem object
package com.candidjava.servlet.upload;

import java.io.File;
import java.io.IOException;
import java.util.List;

import javax.servlet.ServletException;
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;

/**
 * Servlet implementation class Uploadservlet
 */
public class UploadServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
	private final String UPLOAD_DIRECTORY = "d:/uploads";

	protected void doPost(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		if (ServletFileUpload.isMultipartContent(request)) {
			try {
				String fname = null;
				String fsize = null;
				String ftype = null;
				List<FileItem> multiparts = new ServletFileUpload(
						new DiskFileItemFactory()).parseRequest(request);
				for (FileItem item : multiparts) {
					if (!item.isFormField()) {
						fname = new File(item.getName()).getName();
						fsize = new Long(item.getSize()).toString();
						ftype = item.getContentType();
						item.write(new File(UPLOAD_DIRECTORY + File.separator
								+ fname));
					}
				}
				// File uploaded successfully
				request.setAttribute("message", "File Uploaded Successfully");
				request.setAttribute("name", fname);
				request.setAttribute("size", fsize);
				request.setAttribute("type", ftype);
			} catch (Exception ex) {
				request.setAttribute("message", "File Upload Failed due to "
						+ ex);
			}

		} else {
			request.setAttribute("message",
					"Sorry this Servlet only handles file upload request");
		}

		request.getRequestDispatcher("/result.jsp").forward(request, response);

	}
	// TODO Auto-generated method stub
}

Step 3:
Display the result page with file name, size and content type
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
	pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
	<div id="result">
		<h3>${requestScope["message"]}</h3>
		<br>
	</div>
	File name : ${requestScope["name"]}
	<br> File size : ${requestScope["size"]}
	<br> File type : ${requestScope["type"]}

</body>
</html>

Step 4:
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <welcome-file-list>
    <welcome-file>fileupload.html</welcome-file>
  </welcome-file-list>
  <servlet>
    <servlet-name>Uploadservlet</servlet-name>
    <servlet-class>com.candidjava.servlet.upload.UploadServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>Uploadservlet</servlet-name>
    <url-pattern>/upload</url-pattern>
  </servlet-mapping>
</web-app>
Output Screen shot



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