Question

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>

Answer 1

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:

• How to retrieve image from database and display in JSP via Servlet?
• How to retrieve and display images from a database in a JSP page?