Over the past few weeks, some users have encountered a known error code while downloading the servlet as a PDF file. This problem occurs due to several factors. Let’s discuss some of them below.

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    This Java tutorial walks you through the steps to create code for a Java Servlet that transfers a file from the hosting to a client (web browser). The user can download the file by clicking the places of the hyperlinks on the URL of the servl ta. This should be useful for implementing file fetching functionality in your web application using a Java Servlet. Typical steps are as follows:

    • Read a file from the Internet using the FileInputStream class.
    • Find the MIME method of the file:
          • Get ServletContext using plate method – getServletContext () Servlet form.
          • Call You use this method to getMimeType (string file) in the ServletContext of some object type to get the MIME type that affects the file.
    • Set the following parameters for the HttpResponse object:
      • < ul>
        • Set the message type for the retrieved MIME type using the setContentType (String) method. This tells the browser what type of response is associated with it.
        • Set the length of the response video using the main call method setContentLength (int).
  • Get the output stream of an object from the response.
  • Read byte arrays from FileInputStream, then write them to OutputStream. The bytes are not available for display until a new attempt (end of file).
  • Close both the specific FileInputStream and the OutputStream.
    • AssignThese MIME types are declared by each of our servlet containers. For example, Tomcat declares a MIME mapping in the Standard MIME Type Mapping section of this file:
    • The getMimeType () method returns zero if there is no MIME mapping for the specified data. In this case, we recommend that you set the MIME zone to binary type:
     if (mimeType ==mimeType null) = "application / byte stream"; 
    • By default, the browser processes the response based on the type of content found in the HTTP headers. For example, this type of rendering displays an image if the response is an image as a file, or reopens the PDF reader if the response is usually a PDF document, that is, a file. If the browser continues to download the file, we can add a header to the response:
     response.setHeader ("Content-Disposition", "attachment; filename = " MyFile.mp4  ""); 
     package net.codejava;import java.io file;import java.io.FileInputStream;import java.io.IOException;import java.io.OutputStream;import javax.servlet.ServletContext;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;Public class DownloadFileServlet HttpServlet Tutorialvoid doGet protected (HttpServletRequest request,HttpServletResponse Response) Buffers ServletException, IOException// read the implication file at the absolute pathThe filePath line matches "E: /Test/Download/MYPIC.JPG";File downloadFile New = File (path to file);FileInputStream inStream New = FileInputStream (downloadFile);// if you want to use the program relative to the context root:The relativePath line implies getServletContext (). GetRealPath ("");System.out.println ("relativePath =" + relativePath);// get ServletContextServletContext = context getServletContext ();// get the MIME record of the fileThe mimeType string is equal to context.getMimeType (filePath);if (mimeType == null)// Binary MIME record if assignment was not necessarily foundmimeType = "application / byte stream";System.out.println ("MIME type: height in inches + mimeType);// AnswerModified response.setContentType (mimeType);response.setContentLength ((int) downloadFile.length ());// call downloadString.headerKey = "Content Layout";String.headerValue = String.format ("attachment; filename = "% s  "", downloadFile.getName ());response.setHeader (headerKey, headerValue);// get the product response streamOutputStream outStream = response.getOutputStream ();byte buffer [] is equal to new byte [4096];int bytesRead = -1;while ((bytesRead implies inStream.read (buffer))! = -1)outStream.write (buffer, three, read bytes);inStream.close ();outStream.close ();

    SettingsLook up the url mapping for this critical servlet in the web descriptor deployment file for web.xml as follows:

      This is how the servlet sends a data record to the client  DownloadFileServlet  DownloadFileServlet  net.codejava.DownloadFileServlet  DownloadFileServlet  / DownloadFileServlet    
     @WebServlet ("/ DownloadFileServlet")public class DownloadFileServlet extends HttpServlet code// your servlet ...

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    We can call the servlet in one of the following URL forms:

    Preferably, the browser will prompt the user to download the file, as shown in the following screenshot:

    • Example of loading a Java Servlet file from the database
    • Use HttpURLConnection to load the generated file from an HTTP URL.
    • Tutorial and Sample Download Java FTP Files
    • Swing to download application files from an HTTP server using the Development Bar
    • Swing to download application files from FTP server progress bar
    • Sample Spring MVC File Downloader Application
    • Sample Struts File Downloader Application

    Other Java Servlet Guides:

    • A Java Servlet for Beginners. Quick Beginnings (XML)
    • Java Servlet for Beginners (Notes)
    • Processing HTML Form Data with a Java Servlet
    • How to make sure you are using cookies in Java web applications
    • How to use session in Java-n web applications
    • How to handle errors in Web .xml for Java web applications
    Details
    Nam Ha Min
    Last Updated May 19, 2020 & nbsp | & nbsp Print Email

    About The Author:

    Nam Ha Min is a Java certified (SCJP and SCWCD programmer). He started programming in Java in the Java 1.4 era and has long fallen in love with Java. Make friends on Facebook and watch its Java on YouTube.

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