File upload example using servlet and Jsp

By candid | Posted : 22 Aug, 2015 | Updated : 29 Jul, 2017

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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Comments

Jena
The file that you received on your file has not been shown for this error, the program is running. The image of the uploader is not being sent to the image, and the file's original size name is not being displayed, only the heading is shown.

File upload example using servlet and Jsp

Comments

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