get the Title from HTML page (for GAE)

GetPageTitleServlet.java

package io.stalk.gae.html;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;
import java.nio.charset.Charset;

import javax.servlet.http.*;

@SuppressWarnings("serial")
public class GetPageTitleServlet extends HttpServlet {
  
	private String startTag = "<title>";
	private String endTag = "</title>";
	private int startTagLength = startTag.length();
	
	public void doGet(HttpServletRequest req, HttpServletResponse resp)
			throws IOException {
		
		String url = req.getParameter("q");
		String charset = req.getParameter("c");
		
		String title = getPageTitle(url, charset);
		
		resp.setContentType("application/json");
		resp.setCharacterEncoding("UTF-8");
		
		if(title != null){
			resp.getWriter().println(String.format("{\"status\":\"ok\",\"url\":\"%s\"}", title));
		}else{
			resp.getWriter().println("{\"status\":\"error\",\"url\":\"\"}");
		}

	}
	
	private String getPageTitle(String urlString, String cset){
		if(cset != null && cset.length() > 0 && Charset.isSupported(cset)){
			Charset charset = Charset.forName(cset);
			return getPageTitle2(urlString, charset);
		}else{
			return getPageTitle2(urlString, null);
		}
	}
	
	private String getPageTitle2(String urlString, Charset c){
		if(urlString == null || urlString.length() == 0) return "";

		if(urlString.indexOf("http://") != 0 && urlString.indexOf("https://") != 0 )
			urlString = "http://"+urlString;

		BufferedReader bufReader;
		String line;
		boolean foundStartTag = false;
		boolean foundEndTag = false;
		int startIndex, endIndex;
		String title = "";

		try
		{
			URL theURL = new URL(urlString);
			
			if(c !=null){
				bufReader = new BufferedReader( new InputStreamReader(theURL.openStream(), c) );
			}else{
				bufReader = new BufferedReader( new InputStreamReader(theURL.openStream()) );
			}

			while( (line = bufReader.readLine()) != null && !foundEndTag)
			{

				if( !foundStartTag && (startIndex = line.toLowerCase().indexOf(startTag)) != -1 ){
					foundStartTag = true;
				}else{
					startIndex = -startTagLength;
				}

				if( foundStartTag && (endIndex = line.toLowerCase().indexOf(endTag)) != -1 ){
					foundEndTag = true;
				}else{
					endIndex = line.length();
				}

				if( foundStartTag || foundEndTag ){
					title += line.substring( startIndex + startTagLength, endIndex );
				}
			}

			bufReader.close();
			
			if( title.length() > 0 ){
				return title;
			}else{
				return "";
			}

		}
		catch( IOException e )
		{
			e.printStackTrace();
		}
		return "";
	}
}