In this tutorial we are going to look at how to enable your user to upload files to your web application using Servlet/JSP. File uploading is most common feature in every web application for example uploading the profile picture, cover picture etc. We can observe these while applying government jobs and in social networking sites. I used JSP technology for front end purpose and servlet as backend both are related to java programming languages. First we will see how to create dynamic project in eclipse and creating servlet and web.xml in eclipse IDE.
Step 1: Go to File menu -> New -> Dynamic Web Project
Step 2: Sometimes web.xml will not generate while creating project so we have to create manually.
Step 3 : Create the upload.jsp file and in that take a form tag with action and encType=”multipart/
form-data” attributes. If you want to upload binary file we should encTypeattribute to form tag. Using this we can upload binary stuff and in form include two input tags one for to browse the file and another to submit (upload) the file.
<%@ 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>File Uploading using Java</title>
</head>
<body>
<form method="post" action="${ pageContext.request.contextPath}/Uploader"
encType="multipart/form-data">
<input type="file" name="file" value="select images..."/>
<input type="submit" value="start upload"/>
</form>
</body>
</html>
Step 4: To Create servlet class in eclipse right click on src -> new -> other -> web -> servlet. Now Provide the servlet name and package name.
package Demo;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
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.tomcat.util.http.fileupload.FileItem;
import org.apache.tomcat.util.http.fileupload.FileItemFactory;
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 Uploader
*/
@WebServlet("/Uploader")
public class Uploader extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
PrintWriter out = response.getWriter();
if(!ServletFileUpload.isMultipartContent(request)){
out.println("Nothing to upload");
return;
}
FileItemFactory itemfactory = new DiskFileItemFactory();
ServletFileUpload upload = new ServletFileUpload(itemfactory);
try{
List items = upload.parseRequest(request);
for(FileItem item:items){
String contentType = item.getContentType();
if(!contentType.equals("image/png")){
out.println("only png format image files supported");
continue;
}
File uploadDir = new File("F:\\UploadedFiles");
File file = File.createTempFile("img",".png",uploadDir);
item.write(file);
out.println("File Saved Successfully");
}
}
catch(FileUploadException e){
out.println("upload fail");
}
catch(Exception ex){
out.println("can't save");
}
}
}
Could you tell me how to upload an image file on a server on Linux. i'm having problems with the path. i know i have to use the real path but i don't really know how to use the getRealPath() method. Gracias :)
ReplyDeletecan u help, itry,but error in line 37
ReplyDeleteThis comment has been removed by the author.
Deletechange fileitem to FileItem in tipe the list.
Deleteerror is still their...
DeleteMultiple markers at this line
- The method parseRequest(RequestContext) in the type FileUploadBase is not applicable for the arguments
(HttpServletRequest)
- Fileitem cannot be resolved to a type
;(( same problem bro..
DeleteHi kayum iman,
ReplyDeleteI didn't get u, can u please paste the error here?
I am also facing same problem in line 37.
Deleteerror is--The method ParseRequest(HttpServletRequest) is undefined for the type ServletFileUpload
and one more thing i want to ask. instead or image i want to upload .csv file so where change will require and what.
please help me out.
This comment has been removed by the author.
Deletei to got same error .....
DeleteThis comment has been removed by the author.
ReplyDeleteHi I had an issue when saving the image into my computer whether it's png or jpg the image can't be read always when trying to open it can u help me please I've been stuck in this for several hours
ReplyDeleteHi sweety,
ReplyDeletecan u paste the error message here?
The problem is There is no error Message everything's fine but when I go the Image Location on my Computer and try to open it the Image editor return an error saying it's damaged or too large.
DeleteWhich image format your uploading did u checked with both format jpg and png? Please check it once and give the exact path
DeleteTo get idea please check the video demo once.
DeleteI did use jpg and png both but in vain I saw the demo
DeleteI'm using ServletContext().getRealPath("/") as the directory where I upload the image.
Filename never is the same as source filename. it's img27536998724642373.png
DeleteI am also facing same problem in line 37.
Deleteerror is--The method ParseRequest(HttpServletRequest) is undefined for the type ServletFileUpload
and one more thing i want to ask. instead or image i want to upload .csv file so where change will require and what.
please help me out.
sir how can we store other image extensions like jpg
DeleteI am getting this error
ReplyDeletejava.lang.NoSuchMethodError: org.apache.tomcat.util.http.fileupload.servlet.ServletFileUpload.parseRequest(Ljavax/servlet/http/HttpServletRequest;)Ljava/util/List;
at line 40
i am facing this error..can anyone help me:-
ReplyDeleteorg.apache.catalina.connector.RequestFacade cannot be cast to org.apache.tomcat.util.http.fileupload.RequestContext
[-( Error in Line 37 The method ParseRequest(HttpServletRequest) is undefined for the type ServletFileUpload
ReplyDeleteWhy is not someone saying the right answer?
ReplyDeleteCan not line 37 and handle what to do?
The problem is that HttpRequestServlet can not handle it
The problem is that HttpRequestServlet can not handle it.......HELP IN LINE 37....
ReplyDeleteChange in line 37: change: List items = upload.parseRequest(new ServletRequestContext(request));
ReplyDeleteI have these error-
ReplyDeleteThe method parseRequest(RequestContext) in the type FileUploadBase is not applicable for the arguments (HttpServletRequest)
cant save exception generate
ReplyDeleteI wanted to thank you for this excellent read!! I definitely loved every little bit of it. I have you bookmarked your site to check out the new stuff you post. file storage
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