Servlet Download File

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Servlet Upload File Our use case is to provide a simple HTML page where client can select a local file to be uploaded to server. On submission of request to upload the file, our servlet program will upload the file into a directory in the server and then provide the URL through which user can download the file. Download javax.servlet.jar. Javax.servlet/javax.servlet.jar.zip( 123 k) The download jar file contains the following class files or Java source files.

Download File From Url

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Written by Nam Ha Minh
Last Updated on 27 June 2019 Print Email
This Java tutorial describes the steps to write code for a Java servlet that transfers a file from the server to the client (web browser). The user can download the file by clicking on a hyperlink which points to the servlet URL. This would be useful for implementing file download functionality in your web application using Java servlet.The typical steps are as follows:
  • Read the file on the server using FileInputStreamclass.
  • Determine MIME type of the file by:
        • Get the ServletContext via the method getServletContext() method of the servlet.
        • Call the method getMimeType(String file) on the ServletContext object to get MIME type of the file.
  • Set the following information for the HttpResponseobject:
        • Set content type to the MIME type retrieved, by invoking the setContentType(String) method. That tells the browser what kind of the response is.
        • Set content length of the response by invoking the setContentLength(int) method.
  • Obtains the OutputStream object of the response.
  • Read arrays of bytes from the FileInputStream, then write them into the OutputStream. Repeat until no bytes available to read (end of file).
  • Close both the FileInputStream and OutputStream.
NOTES:

Javax Servlet Jar Download

  • The mapping of MIME types is declared by the servlet container. For example, Tomcat declares MIME mapping under section “Default MIME Types Mapping” in this file:

Tomcat install directoryconfweb.xml

  • The method getMimeType() returns null if there is no MIME mapping for the specified file. In this case, it is recommended to forcedly set the MIME type to be binary type:
  • By default, the browser handles the response based on the content type set in HTTP headers. For example, it will render the image if the response is an image file or cialis online, or open a PDF reader program if the response is a PDF document, etc. In case we want to force the browser always downloads the file, we can add this header to the response:

Jsp Servlet Download File Example

And following is code of the Java servlet called DownloadFileServlet:Configure URL mapping for this servlet in the web deployment descriptor file Servlet download file nameweb.xml as follows:Or use the @WebServlet annotation in Servlet 3.0:We can invoke the servlet in the following form of URL:

http://localhost:8080/MyWebApp/DownloadFileServlet

Servlet Response Download File

The browser should ask the user to download the file as shown in the following screenshot:

Related Java File Dowload Tutorials:

Other Java Servlet Tutorials:


About the Author:

Nam Ha Minh is certified Java programmer (SCJP and SCWCD). He started programming with Java in the time of Java 1.4 and has been falling in love with Java since then. Make friend with him on Facebook.

Download File For Adobe Flash Player

Attachments:
[Source code for servlet]1 kB