package webServer;/* From browser you can retrieve data as follows *//* http://localhost:8080/testudo.jpg *//* http://localhost:8080/quotes.txt  *//* http://localhost:8080/exercise.pdf */import java.io.*;import java.net.ServerSocket;import java.net.Socket;import java.net.URLConnection;import java.util.regex.*;public class SimpleWebServer {	public static void main(String[] args) throws Exception {		ServerSocket ss = new ServerSocket(8080);		Pattern pattern = Pattern.compile("GET /(.+) (HTTP/1.0|HTTP/1.1)");		while (true) {			System.out.println("Web Server Running");			Socket s = ss.accept();			BufferedReader in = new BufferedReader(new InputStreamReader(					s.getInputStream()));			PrintWriter out = new PrintWriter(new OutputStreamWriter(					s.getOutputStream()));			String request = in.readLine();			System.out.println("Request received: " + request);			Matcher matcher = pattern.matcher(request);			matcher.find();			String fileName = matcher.group(1);			File file = new File("htdocs/" + fileName);			String contentType = URLConnection.getFileNameMap().getContentTypeFor(file.toURL().toString());			System.out.println("Content type detected: " + contentType);			/* Adding the file contents */			try {				/* Opening the file */				FileInputStream fileInputStream = new FileInputStream(file);								/* Writing the header */				out.print("HTTP/1.1 200 OK" + "\n");				out.print("Content-Type: " + contentType + "\n");				out.print("\n");				out.flush();				int byteOfData = fileInputStream.read();				while (byteOfData != -1) {					s.getOutputStream().write(byteOfData);					byteOfData = fileInputStream.read();				}				out.flush();				out.close();				fileInputStream.close();							} catch (FileNotFoundException e) {				out.println("HTTP/1.1 404 Not Found");				out.println("Content-Type: text/html\n");				out.println();				out.println("<h1>Invalid Request</h1>");				out.close();			} 		}	}}