Tips For Allowing Servlet File Output

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    You may encounter an error when viewing the output of the servlet file. There are several ways to solve this problem, and we’ll discuss them shortly.

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    This Java tutorial walks you through the steps: Write code for a Java Servlet that sends a file from the entire server to the client (web browser). The user can manually upload the file by clicking the hyperlink that appears.This usually refers to the URL servlet. This would be useful for implementing the file upload functionality in your production web application using a Java Servlet. Typical steps are likely to be:

    • Play your own file on the server using FileInputStreamclass.
    • Determine the MIME type of the file according to:
          • Get the ServletContext using the servlet getServletContext () method.
          • Call the getMimeType method (string file) on all ServletContext objects to get the MIME dog breed from the file. Install
    • Usage info for HttpResponse object:
          • Set the content type for the extracted MIME type by calling setContentType (String). Having said which browser option is the answer.
          • Set the length of the response content simply by calling setContentLength (int).
    • This protects the OutputStream object from being answered.
    • Read the bytes from the FileInputStream array, then write them to the OutputStream. Repeat until you run out of readable bytes (end of file).
    • Close everything as well as the InputStream file.

    REMARKS:

    • MIME types for cards are declared by this servlet container. For example, Tomcat specifies the MIME mapping in the Default MIME Type Mapping section of this file:
    • The getMimeType () path returns zero if there is usually no MIME mapping for the specified file. In this case, it is recommended to only force the conversion of the MIME type to binary:
     if (mimeType == null)mimeType = "application / byte stream"; 
    • By default, the browser processes the response based on the content specified in the HTTP headers. As an exercise, the image is usually displayed if the response is a photo file, or the PDF reader usually opens if the response is a computer PDF file, etc. If we want you to still download the file from the browser, we we can add these headers to the response:
     response.setHeader ("Content-Disposition", "attachment; filename = " MyFile.mp4  ""); 

    DownloadFileServlet

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  •  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;open    DownloadFileServlet class extends HttpServletvoid doGet protected (HttpServletRequest request,HttpServletResponse) throws ServletException, IOException// follow the input file from the absolute path to the effective pathString filePath = "E: /Test/Download/MYPIC.JPG";File downloadFile = young file (filePath);FileInputStream inStream = FileInputStream (downloadFile);// new, although you want to use the summary path to the root of the context:The relativePath line implies getServletContext (). GetRealPath ("");System.out.println ("relativePath =" + relativePath);// buy ServletContextServletContext. = GetServletContext ();// Get the MIME type of the fileThe mimeType string matches context.getMimeType (filePath);if (mimeType null) ==// Set to binary if no MIME matches were foundmimeType = "application / byte stream";System.out.println ("MIME type: in + typeMime);// change the answerresponse.setContentType (mimeType);response.setContentLength ((int) downloadFile.length ());// download energiesString = headerKey "Content-Disposition";String headerValue is equal to String.format ("attachment; filename = "% s  "", downloadFile.getName ());response.setHeader (headerKey, headerValue);// Display the flow of return purchasesOutputStream outStream = response.getOutputStream ();byte [] corresponds to buffering a new byte [4096];int bytesRead means -1;while ((bytesRead = inStream.read (buffer))! = -1)outStream.write (buffer, 0, bytesRead);inStream.close ();outStream.close ();

    Na Build the Servlet Mapping URL in the Web Deployment Descriptor File

    web.xml
    servlet file output

      This sends the servlet file to the client  DownloadFileServlet  DownloadFileServlet  net.codejava.DownloadFileServlet  DownloadFileServlet  / DownloadFileServlet    

    @WebServlet

     @WebServlet ("/ DownloadFileServlet")public class DownloadFileServlet extends HttpServlet// servlet code ...

    servlet file output

    We have the ability to call the servlet in the correct URL form:

    The browser should ask the user to load the initiative, as shown in the following screenshot:

    • An example of loading a Java servlet file from a database.
    • Use HttpURLConnection to download a file from an HTTP url.
    • Java FTP File Upload, Mini Workshop & Example
    • Switch to the formats for downloading applications from the HTTP server using the improvements panel.
    • Swing to download application files from an FTP server with a progress bar
    • Spring MVC is trying to load files from the application.
    • Sample Struts File Upload

    Other Java Servlet Guides:

    • Quick Launch Java Servlet for Non-Experienced Users (XML)
    • Java Servlet for Beginners (Notes)
    • Processing HTML path data with a Java Servlet
    • How to use cookies in a Java web application
    • How to use a session in an online Java n application
    • How to handle errors in Web.xml to create Java web applications
    Details
    Nam Ha Last Minh
    Updated May 19, 2020 & nbsp | & nbsp Print Email

    About The Author:

    Nam Ha Min

    Certified Java Engineer (SCJP and SCWCD). He started growing with Java over time thanks to Java 1.4 and since then fell deeply in love with Java. Make friends with

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