import java.io.*;
import java.net.*;
import java.util.*;
public final class WebServer {
public static void main(String[] args) throws Exception
{
// Establish the listen socket.
ServerSocket wS = new ServerSocket(6789);
while (true) {
// Listen for a TCP connection request.
Socket cS = wS.accept();
// Construct an object to process the HTTP request message.
HttpRequest request = new HttpRequest(cS);
// Create a new thread to process the request.
Thread thread = new Thread(request);
// Start the thread.
thread.start();
}
}
}
import java.io.*;
import java.net.*;
import java.util.*;
final class HttpRequest implements Runnable {
final static String CRLF = "\r\n";
Socket socket;
// Constructor
public HttpRequest(Socket socket) throws Exception {
this.socket = socket;
}
public void run() {
try {
processRequest();
} catch (Exception e) {
System.out.println(e);
}
}
private void processRequest() throws Exception
{
InputStream is = socket.getInputStream();
DataOutputStream os = new DataOutputStream(socket.getOutputStream());
BufferedReader br = new BufferedReader(new InputStreamReader(is));
String requestLine = br.readLine();
// Display the request line.
System.out.println();
System.out.println(requestLine);
String headerLine = null;
while ((headerLine = br.readLine()).length()!=0) {
System.out.println(headerLine);
}
// Extract the filename from the request line.
StringTokenizer tokens = new StringTokenizer(requestLine);
tokens.nextToken();
tokens.nextToken(); // skip over the method, which should be �GET�
String fileName = tokens.nextToken();
// Prepend a �.� so that file request is within the current directory.
fileName = "." + fileName;
System.out.println("Filename to Get"+fileName);
// Open the requested file.
FileInputStream fis = null;
boolean fileExists = true;
try {
fis = new FileInputStream("webtext.html");
} catch (FileNotFoundException e) {
fileExists = false;
}
// Construct the response message.
String statusLine = null;
String contentTypeLine = null;
String entityBody = null;
if (fileExists) {
statusLine = "200 OK:";
contentTypeLine = "Content-Type: " +
contentType( fileName ) + CRLF;
} else {
statusLine = "HTTP/1.1 404 Not Found:";
contentTypeLine = "Content-Type: text/html"+ CRLF;
entityBody = "" +
"Not Found" +
"Not Found";
}
// Send the status line.
os.writeBytes(statusLine);
// Send the content type line.
os.writeBytes(contentTypeLine);
// Send a blank line to indicate the end of the header lines.
os.writeBytes(CRLF);
// Send the entity body.
if (fileExists) {
sendBytes(fis, os);
fis.close();
} else {
os.writeBytes(entityBody);
}
os.writeBytes(entityBody);
DataOutputStream outToClient = new
DataOutputStream(socket.getOutputStream());
outToClient.writeBytes("HTTP/1.1 200 OK");
outToClient.writeBytes("Content-Length: 100");
outToClient.writeBytes("Content-Type: text/html\n\n");
outToClient.writeBytes(" My First Heading My first paragraph.\n");
outToClient.close();
// Close streams and socket.
os.close();
br.close();
socket.close();
}
private static String contentType(String fileName)
{
if(fileName.endsWith(".html") || fileName.endsWith(".html")) {
return "text/html";
}
return "application/octet-stream";
}
private static void sendBytes(FileInputStream fis, OutputStream os)
throws Exception {
// Construct a 1K buffer to hold bytes on their way to the socket.
byte[] buffer = new byte[1024];
int bytes = 0;
// Copy requested file into the socket�s output stream.
while ((bytes = fis.read(buffer)) != -1) {
os.write(buffer, 0, bytes);
}
}
}
