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FrontEnd.java
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import java.io.*;
import java.util.Base64;
import java.nio.file.*;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
import org.eclipse.jetty.server.*;
import org.eclipse.jetty.servlet.*;
public class FrontEnd
{
public static byte[] readAllBytes(InputStream is) throws IOException
{
ByteArrayOutputStream buffer = new ByteArrayOutputStream();
int nRead;
byte[] data = new byte[16384];
while ((nRead = is.read(data, 0, data.length)) != -1) {
buffer.write(data, 0, nRead);
}
buffer.flush();
return buffer.toByteArray();
}
public static void main(String[] args) throws Exception
{
int port = 12345;
if (args.length > 0) {
port = Integer.parseInt(args[0]);
}
Server server = new Server(port);
ServletContextHandler context = new ServletContextHandler(ServletContextHandler.SESSIONS);
context.setContextPath("/");
ServletHolder fileUploadServletHolder = new ServletHolder(new FrontEndServlet());
fileUploadServletHolder.getRegistration().setMultipartConfig(new MultipartConfigElement("data/tmp"));
context.addServlet(fileUploadServletHolder, "/");
server.setHandler(context);
server.start();
server.join();
}
public static class FrontEndServlet extends HttpServlet
{
public static final String uploadForm =
"<html>\n" +
"<head>\n" +
" <title>MMDB</title>\n" +
" <link rel=\"stylesheet\" href=\"https://cdnjs.cloudflare.com/ajax/libs/materialize/0.99.0/css/materialize.min.css\">\n" +
" <script type=\"text/javascript\" src=\"https://cdnjs.cloudflare.com/ajax/libs/materialize/0.99.0/js/materialize.min.js\"></script>\n" +
" <script type=\"text/javascript\" src=\"https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.1/jquery.min.js\"></script>\n" +
"\n" +
"</head>\n" +
"<body>\n" +
"\n" +
"<nav>\n" +
" <div class=\"nav-wrapper\">\n" +
" <a class=\"brand-logo center\">Content Based Image Retrieval</a>\n" +
" <ul id=\"nav-mobile\" class=\"right hide-on-med-and-down\">\n" +
" <li><a href=\"index.jsp\">Home</a></li>\n" +
" <li><a href=\"about.jsp\">About</a></li>\n" +
" </ul>\n" +
" </div>\n" +
"</nav>\n" +
"\n" +
"<div class=\"container\">\n" +
"\n" +
" <div class=\"row\">\n" +
"\n" +
" <form enctype=\"multipart/form-data\" method=\"post\" name=\"fileinfo\">\n" +
"\n" +
" <div class=\"file-field input-field\">\n" +
" <div class=\"btn\">\n" +
" <span> Upload Image</span>\n" +
" <input type=\"file\" name=\"file\" id=\"image1\" onchange=\"readURL(this);\" required>\n" +
" </div>\n" +
" <div class=\"file-path-wrapper\">\n" +
" <input class=\"file-path validate\" id=\"place\" type=\"text\" placeholder=\"Upload a reference image..\">\n" +
" </div>\n" +
"\n" +
" </div>\n" +
" <div class=\"row\">\n" +
"\n" +
" <div class=\"col s2\">\n" +
" <div>\n" +
" <button class=\"btn waves-effect waves-light\" type=\"submit\">Search\n" +
" </button>\n" +
" </div>\n" +
" </div>\n" +
" <div class=\"col s10\">\n" +
" <img id=\"blah\" style='border-radius: 10px;' />\n" +
" </div>\n" +
" </div>\n" +
"\n" +
" </form>\n" +
" </div>\n" +
"\n" +
" <div id=\"results\" class=\"row\">\n" +
"\n" +
" </div>\n" +
"\n" +
"\n" +
"</div>\n" +
"\n" +
"\n" +
"<script>\n" +
" function readURL(input) {\n" +
" if (input.files && input.files[0]) {\n" +
" var reader = new FileReader();\n" +
"\n" +
" reader.onload = function (e) {\n" +
" $('#blah')\n" +
" .attr('src', e.target.result)\n" +
" .width(150)\n" +
" .height(150);\n" +
" };\n" +
" reader.readAsDataURL(input.files[0]);\n" +
" document.getElementById(\"place\").setAttribute(\"value\", document.getElementById(\"image1\").files[0].name);"+
" }\n" +
" }\n" +
"</script>\n" +
"\n" +
"<script>\n" +
" var form = document.forms.namedItem(\"fileinfo\");\n" +
" form.addEventListener('submit', function (ev) {\n" +
"\n" +
" var oOutput = document.getElementById(\"results\"),\n" +
" oData = new FormData(form);\n" +
" oOutput.innerHTML = \"<br/><h3>Getting results, please wait ...</h3>\";\n" +
" // In case we need to send extra data to the request handler which is UploadServlet in our case\n" +
" oData.append(\"CustomField\", \"This is some extra data\");\n" +
"\n" +
" var oReq = new XMLHttpRequest();\n" +
" oReq.open(\"POST\", \"\", true);\n" +
" oReq.onload = function (oEvent) {\n" +
" if (oReq.status == 200) {\n" +
" // here we update the UI after getting the response results\n" +
" oOutput.innerHTML = oReq.responseText;\n" +
" } else {\n" +
" oOutput.innerHTML = \"Error \" + oReq.status + \" occurred when trying to upload your file.<br \\/>\";\n" +
" }\n" +
" };\n" +
"\n" +
" oReq.send(oData);\n" +
" ev.preventDefault();\n" +
" }, false);\n" +
"</script>\n" +
"\n" +
"\n" +
"</body>\n" +
"</html>\n";
@Override
protected void doGet( HttpServletRequest request, HttpServletResponse response )
throws ServletException, IOException
{
response.setContentType("text/html");
response.setStatus(HttpServletResponse.SC_OK);
response.getWriter().println(uploadForm);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException
{
resp.setContentType("text/html");
PrintWriter out = resp.getWriter();
Part part = req.getPart("file");
byte[] uploadedImage = readAllBytes(part.getInputStream());
try {
Connection conn = DriverManager.getConnection("jdbc:oracle:thin:hr/oracle@localhost:1521/orcl");
PreparedStatement stmt = conn.prepareStatement("SELECT image FROM images WHERE is_lucene_similar(image, ?) = 1");
stmt.setBytes(1, uploadedImage);
ResultSet rs = stmt.executeQuery();
int counter = 0;
final int imagesPerRow = 6;
out.println("<table>");
while (rs.next()) {
if (counter % imagesPerRow == 0) {
out.println("<tr>");
}
String base64image = Base64.getEncoder().encodeToString(rs.getBytes(1));
out.println("<td><img width='150' height='150' style='border-radius: 10px;' src=\"data:image/jpeg;base64," + base64image + "\"></td>");
counter++;
if (counter % imagesPerRow == 0) {
out.println("</tr>");
}
}
out.println("</table>");
rs.close();
conn.close();
} catch (Exception e) {
e.printStackTrace();
out.println("<div class='row'><h4>Unable to establish a connection to the database :(</h4></div>");
}
}
}
}