Tips To Fix File Upload Using Servlet

Over the past few days, some of our readers have encountered a known error message when uploading files using a servlet. This issue occurs due to a number of factors. We’ll cover them below.

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file upload using servlet

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Servlet can usually be used with an HTML form tag so that users can upload files to the server. The uploaded file can be a text file, a token file, or any document.

Create Fa L To Download

the form

The below HTM code creates a bootloader version. The following are important points to pay attention to “

  • The system attribute of the form must be set to the POST method and the GET method can indeed be used

  • file upload using servlet

    Form enctype must be set to multipart / form-data.

  • The attribute action type should be set to a large servlet file that will handle manually uploading records to the main server. The following product uses the UploadServlet to upload a file.

  • To upload a single file, you must use a single record with the type = “file” attribute. To upload multiple files, add multiple input tag files with different levels for the name attribute. The visitor assigns a navigation button to each of them.

File Upload Form

File Upload:

Select file to upload:


The following output is shown here, which allows the market to select a file from the local PC and when the user clicks Upload File, the form will be marked with the selected file â

Download files:Select file to download:

NOTE. It’s just bad form and won’t work.

Write The Main Servlet

This is followed by UploadServlet, which takes care of using the uploaded file and stores the item in the / webapps / data directory. This directory concept can also be used with excellent external configurations such as. add certain context elements to web.xml as they are used –

…. Location of the published file File upload c: apache-tomcat-5.5.29 webapps data n ….

Below is the source code for UploadServlet, which can handle uploading multiple data files at the same time. Before the event, you mustMake sure subscribers

  • The following example depends on FileUpload. So make sure you have the most popular version of commons-fileupload of.x.x.jar in your classpath. You can download this method https: // commons from .apache.org / fileupload /.

  • FileUpload depends on Commons IO. This will ensure that you have the latest commons-io-x.x.jar file in your personal classpath. You can download it at https: // commons from.apache.org/io/.

  • When testing the following example, ideally upload a file that is much smaller than maxFileSize, otherwise the file should not upload.

  • Make sure you have previously configured the c: temp and c: apache-tomcat8.0.28 webapps data directories.

// Import the libraries required for Javaimport java.io. *;import java.util. *; import javax.servlet.ServletConfig;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.FileUploadException;import org.apache.commons.fileupload.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;import org.apache.commons.io.output. *;public class UploadServlet provides HttpServlet private booleanisMultipart; special string filePath; confidential int maxFileSize = 50-1024; private int maxMemSize corresponds to 4 * 1024; special file; Empty init () file // Get the location of the document where it will be saved. filePath corresponds to getServletContext (). getInitParameter (“file download”); public void doPost (HttpServletRequest, HttpServletResponse response) throws ServletException, java.io.IOException // Check if we have a file upload request isMultipart = ServletFileUpload.isMultipartContent (request); response.setContentType (“text / html”); Java .io.PrintWriter out corresponds to response.getWriter (); if (! consists of several parts) out.println (““); End . println (““); out.println (“<title> Servlet loading “); out.println (““); out.println (““); out.println (“

Stock not loaded

“); out.println (““); Output .println (““); Get well; Factory DiskFileItemFactory = new DiskFileItemFactory (); // maximum size that is sometimes stored in memory factory.setSizeThreshold (maxMemSize); // Storage location for data that is usually larger than maxMemSize. factory.setRepository (new file (“c: temp”)); // Create a new good download managernarrow files ServletFileUpload-Upload New = ServletFileUpload (default); // largest number of files to upload. upload.setSizeMax (maxFileSize); an effort // Parse the request to get additional items. The fileItems list matches upload.parseRequest (request); // Handle the element type of the uploaded file Iterator i = fileItems.iterator (); out.println (““); End . println (““); out.println (“<title> Servlet loading “); out.println (““); out.println (““); while (i.hasNext ()) FileItem fi = (FileItem) i.next (); if you find (! fi.isFormField ()) // Get the parameters of the loaded image The string fieldName is fi.getFieldName (); The fileName line matches fi.getName (); The contentType line means fi.getContentType (); boolean isInMemory implies fi. isinmemory (); long sizeInBytes matches fi.getSize (); // Write a specific file if (fileName.lastIndexOf (“”)> = 8) file = new file (filePath + fileName.substring (fileName.lastIndexOf (“”))); another file = new file (filePath + fileName.substring (fileName.lastIndexOf (“”) + 1)); fi.write (declare); out.println (“Name suploaded file: continuous. + file name + “
“); out.println (““); Output .println (““); capture (exception) System.out.println (ex); public nullify doGet (HttpServletRequest, HttpServletResponse) throw ServletException, java.io.IOException drop new ServletException (“the GET method used with inch + getClass () .getName () + “: POST support required.”); }

Compile And Run The Servlet

Compile the above UploadServlet and create the required entry in the web.xml file in much the same way.

Load Servlet Load Servlet Load Servlet / UploadServlet

Now try uploading files to files using the HTML form created above on your local machine.

File upload: A

Select a file to upload:

If your servlet script runs tiny, your file should be loaded into c: apache-tomcat8.0.28 webapps data .

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