CODEWITHSUNDEEP
javaimagejspservlets
a k
a k

Reputation: 827

How to show a JSP page using Servlet which has image in its Response?

Servlet doGet() code for getting an Image from Database and to store image in Response

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws 
ServletException, IOException {

// Get userid from session

try {

    // Get photos from database in (image)

    // Init servlet response.
    response.reset();
    response.setBufferSize(DEFAULT_BUFFER_SIZE);
    response.setContentType(image.getContenttype());
    response.setHeader("Content-Length", String.valueOf(image.getLength()));
    response.setHeader("Content-Disposition", "inline; filename=\"" + image.getTitle()
    + "\"");

    // Prepare streams.
    BufferedInputStream input = null;
    BufferedOutputStream output = null;

    try {
        // Open streams.
        input = new BufferedInputStream(image.getPhoto(), DEFAULT_BUFFER_SIZE);
        output = new BufferedOutputStream(response.getOutputStream(),
                 DEFAULT_BUFFER_SIZE);

        // Write file contents to response.
        byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];
        int length;
        while ((length = input.read(buffer)) > 0) {
            output.write(buffer, 0, length);
        }
    } finally {
        // Gently close streams.
        output.close();
        input.close();
    }

    //Redirect it to photo page
    RequestDispatcher rd = request.getRequestDispatcher
        ("/webplugin/jsp/profile/photos.jsp");
    rd.forward(request, response);

} catch (Exception e) {
    e.printStackTrace();
}

}

However, When this servlet shows the JSP page it shows only image and not the JSP page.

JSP code:

... JSP code

<img src="Servlet url">

... JSP code cont...

What output I get:

  1. I only get Image instead of image inside JSP
  2. When I use RequestDispatcher/sendRedirect() I get following Exception java.lang.IllegalStateException: Cannot forward after response has been committed

Question:

  1. How to get Image inside JSP instead of just Image in browser
  2. How to avoid above Exception?

EDIT: My Web.xml looks like this

<servlet>
    <servlet-name>Photo Module</servlet-name>
    <servlet-class>app.controllers.PhotoServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>Photo Module</servlet-name>
    <url-pattern>/Photos</url-pattern>
</servlet-mapping>

Upvotes: 0

Views: 13536

Answers (2)

Jigar Joshi
Jigar Joshi

Reputation: 240860

1 you are modifying response and then forwarding , it is useless. don't do it.

2 How to get image from servlet to jsp

Upvotes: 2

BalusC
BalusC

Reputation: 1108632

How to get Image inside JSP instead of just Image in browser

Enter the URL to the JSP file containing the <img> element in the browser address bar.

http://localhost:8080/contextname/webplugin/jsp/profile/photos.jsp

How to avoid above Exception?

Remove the following lines from the servlet code.

//Redirect it to profile page
RequestDispatcher rd = request.getRequestDispatcher
    ("/webplugin/jsp/profile/photos.jsp");
rd.forward(request, response);

The servlet should just return the image. Nothing more. It's the webbrowser itself who is supposed to download and display the image, not the webserver.

See also:

Upvotes: 4

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