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    <pre><code>import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * Image streaming Servlet. */ public class ImageDisplayServlet extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public ImageDisplayServlet() { super(); } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String relativePath = trimToEmpty(request.getPathInfo()); // Make sure no one try to screw with us. // This is important as user can literally access any file if we are not careful if(isXSSAttack(relativePath) == false) { String pathToFile = this.getServletContext().getRealPath(request.getPathInfo()); File file = new File(pathToFile); System.out.println("Looking for file " + file.getAbsolutePath()); // show a 404 page if(!file.exists() || !file.isFile()) { httpError(404, response); } else { try { streamImageFile(file, response); } catch(Exception e) { // Tell the user there was some internal server error.\ // 500 - Internal server error. httpError(500, response); e.printStackTrace(); } } } else { // what to do if i think it is a XSS attack ?!? } } private void streamImageFile(File file, HttpServletResponse response) { // find the right MIME type and set it as content type response.setContentType(getContentType(file)); BufferedInputStream bis = null; BufferedOutputStream bos = null; try { response.setContentLength((int) file.length()); // Use Buffered Stream for reading/writing. bis = new BufferedInputStream(new FileInputStream(file)); bos = new BufferedOutputStream(response.getOutputStream()); byte[] buff = new byte[(int) file.length()]; int bytesRead; // Simple read/write loop. while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) { bos.write(buff, 0, bytesRead); } } catch (Exception e) { throw new RuntimeException(e); } finally { if (bis != null) { try { bis.close(); } catch (IOException e) { e.printStackTrace(); // To late to do anything about it now, we may have already sent some data to user. } } if (bos != null) { try { bos.close(); } catch (IOException e) { e.printStackTrace(); // To late to do anything about it now, we may have already sent some data to user. } } } } private String getContentType(File file) { if(file.getName().length() &gt; 0) { String[] parts = file.getName().split("\\."); if(parts.length &gt; 0) { // only last part interests me String extention = parts[parts.length - 1]; if(extention.equalsIgnoreCase("jpg")) { return "image/jpg"; } else if(extention.equalsIgnoreCase("gif")) { return "image/gif"; } else if(extention.equalsIgnoreCase("png")) { return "image/png"; } } } throw new RuntimeException("Can not find content type for the file " + file.getAbsolutePath()); } private String trimToEmpty(String pathInfo) { if(pathInfo == null) { return ""; } else { return pathInfo.trim(); } } private void httpError(int statusCode, HttpServletResponse response) { try { response.setStatus(statusCode); response.setContentType("text/html"); PrintWriter writer = response.getWriter(); writer.append("&lt;html&gt;&lt;body&gt;&lt;h1&gt;Error Code: " + statusCode + "&lt;/h1&gt;&lt;body&gt;&lt;/html&gt;"); writer.flush(); } catch (IOException e) { e.printStackTrace(); } } private boolean isXSSAttack(String path) { boolean xss = false; // Split on the bases of know file separator String[] parts = path.split("/|\\\\"); // Now verify that no part contains anything harmful for(String part : parts) { // No double dots .. // No colons : // No semicolons ; if(part.trim().contains("..") || part.trim().contains(":") || part.trim().contains(";")) { // Fire in the hole! xss = true; break; } } return xss; } /** * @see HttpServlet#doPost(Ht/promotions/some.jpgtpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } } </code></pre> <p>Ok Here is a Servlet that I quickly wrote that can stream images:</p> <p><strong>Here is the List of limitations and know issues:</strong></p> <ul> <li>May have XSS vulnerability use with care</li> <li>Not production ready use as reference</li> <li>Images need to in the web application directory. Can be easily change but I too lazy (it is not worth it the project is too small)</li> <li>Only stream jpg,gif or png files.</li> </ul> <p><strong>Usage:</strong></p> <p>Let say you deploy this web application called images as separate application.</p> <p><a href="http://www.example.com/images/promotions/promo.jpg" rel="nofollow noreferrer">http://www.example.com/images/promotions/promo.jpg</a></p> <p>means there should be a directory in "promotions" with image "promo.jpg" with in this images web application.</p> <p>PS: Do not ask why I am doing this Servlet Container only solution that sucks big time.</p>
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