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//***************************************
// HTTP Server
//***************************************
import java.net.*;
import java.io.*;
import java.util.*;
import java.lang.*;
public class httpServer
{
public static void main(String args[]) {
int port;
ServerSocket server_socket;
try {
port = Integer.parseInt(args[0]);
}
catch (Exception e) {
port = 4444;
}
try {
//print out the port number for user
server_socket = new ServerSocket(port);
System.out.println("httpServer running on port " +
server_socket.getLocalPort());
// server infinite loop
while(true) {
Socket socket = server_socket.accept();
System.out.println("New connection accepted " +
socket.getInetAddress() +
":" + socket.getPort());
// Construct handler to process the HTTP request message.
try {
httpRequestHandler request =
new httpRequestHandler(socket);
// Create a new thread to process the request.
Thread thread = new Thread(request);
// Start the thread.
thread.start();
}
catch(Exception e) {
System.out.println(e);
}
}
}
catch (IOException e) {
System.out.println(e);
}
}
}
class httpRequestHandler implements Runnable
{
final static String CRLF = "\r\n";
Socket socket;
InputStream input;
OutputStream output;
BufferedReader br;
// Constructor
public httpRequestHandler(Socket socket) throws Exception
{
this.socket = socket;
this.input = socket.getInputStream();
this.output = socket.getOutputStream();
this.br =
new BufferedReader(new InputStreamReader(socket.getInputStream()));
}
// Implement the run() method of the Runnable interface.
public void run()
{
try {
processRequest();
}
catch(Exception e) {
System.out.println(e);
}
}
private void processRequest() throws Exception
{
while(true) {
String headerLine = br.readLine();
System.out.println(headerLine);
if(headerLine.equals(CRLF) || headerLine.equals("")) break;
StringTokenizer s = new StringTokenizer(headerLine);
String temp = s.nextToken();
if(temp.equals("GET")) {
String fileName = s.nextToken();
fileName = "." + fileName ;
// Open the requested file.
FileInputStream fis = null ;
boolean fileExists = true ;
try
{
fis = new FileInputStream( fileName ) ;
}
catch ( FileNotFoundException e )
{
fileExists = false ;
}
// Construct the response message.
String serverLine = "Server: fpont simple java httpServer";
String statusLine = null;
String contentTypeLine = null;
String entityBody = null;
String contentLengthLine = "error";
if ( fileExists )
{
statusLine = "HTTP/1.0 200 OK" + CRLF ;
contentTypeLine = "Content-type: " +
contentType( fileName ) + CRLF ;
contentLengthLine = "Content-Length: "
+ (new Integer(fis.available())).toString()
+ CRLF;
}
else
{
statusLine = "HTTP/1.0 404 Not Found" + CRLF ;
contentTypeLine = "text/html" ;
entityBody = "<HTML>" +
"<HEAD><TITLE>404 Not Found</TITLE></HEAD>" +
"<BODY>404 Not Found"
+"<br>usage:http://www.snaip.com:4444/"
+"fileName.html</BODY></HTML>" ;
}
// Send the status line.
output.write(statusLine.getBytes());
// Send the server line.
output.write(serverLine.getBytes());
// Send the content type line.
output.write(contentTypeLine.getBytes());
// Send the Content-Length
output.write(contentLengthLine.getBytes());
// Send a blank line to indicate the end of the header lines.
output.write(CRLF.getBytes());
// Send the entity body.
if (fileExists)
{
sendBytes(fis, output) ;
fis.close();
}
else
{
output.write(entityBody.getBytes());
}
}
}
try {
output.close();
br.close();
socket.close();
}
catch(Exception e) {}
}
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);
}
}
private static String contentType(String fileName)
{
if (fileName.endsWith(".htm") || fileName.endsWith(".html"))
{
return "text/html";
}
return "";
}
} | 
