Wanted: Minimal Web Server Example

[Siegfried Heintze]

Anyone have a minimal java program that will pump static HTML files out on a socket when a browser connects with an HTTP GET or POST?
I expect it to be less than 100 lines. I could write it myself but surely someone has already done it many times.

[Donal Lynch]

  
import java.io.*;
import java.net.*;
import java.util.StringTokenizer;
final class Fileserver
{
  public static void main( String[] args )
    throws Exception
  {
    if( args.length < 2 )
      printUsageAndExit();
    
    int port = Integer.parseInt( args[0] );
    String docRootName = args[1];
    
    File docRoot = new File( docRootName );
    if( !docRoot.exists() || !docRoot.isDirectory() )
    {
      System.out.println( "Document root must be a directory that exists. Not starting..." );
      System.exit(1);
    }
    
    ServerSocket serverSocket = new ServerSocket(port);
    System.out.println( "Starting server on port " + port );
    
    while(true)
    {
      Socket socket = serverSocket.accept();
      System.out.println( "accepted: " + socket );
      DataInputStream in = 
        new DataInputStream( 
        new BufferedInputStream(
        socket.getInputStream() ) );
      java.util.ArrayList lines = new java.util.ArrayList();
      
      while(true)
      {
        String line = in.readLine();
        if( line == null || line.equals("") )
          break;
        lines.add(line);
        System.out.println(line);
      }  
      
      String firstLine = (String)lines.get(0);
      StringTokenizer st = new StringTokenizer(firstLine, " " );
      String method = st.nextToken();
      String fileName = st.nextToken();
      String version = st.nextToken();
      
      File file = new File( docRootName + fileName );
      System.out.println( "file=" + file );
      
      PrintStream out = 
        new PrintStream(
        new BufferedOutputStream(
        socket.getOutputStream() ) );
        
      if( !file.exists() )
      {
        System.out.println( "!!! 404: " + file );
        out.print( "HTTP/1.0 404 Not Found\r\n" );
        out.print( "Content-length: 9\r\n" );
        out.print( "\r\n" );
        out.print( "not found" );
      }
      else if( file.isDirectory() )
      {
        out.print( "HTTP/1.0 302 Redirect\r\n" );
        out.print( "Location: index.html\r\n" );
        out.print( "\r\n" );
      }
      else
      {
        ByteArrayOutputStream fileContents = new ByteArrayOutputStream();
        InputStream fileIn = new BufferedInputStream( new FileInputStream( file ) );
        int c;
        while( (c = fileIn.read())!=-1 )
          fileContents.write(c);
        fileIn.close();
        out.print( "HTTP/1.0 200 OK\r\n" );
        if( fileName.endsWith( ".html" ) )
          out.print( "Content-type: text/html\r\n" );
        else
          out.print( "Content-type: text/plain\r\n" );
        out.print( "Content-length: " + fileContents.size() + "\r\n" );
        out.print( "\r\n" );
        fileContents.writeTo( out );
      }
      out.flush();
      out.close();
      in.close();
      socket.close();
    
    }
    
  
  
  }
  private static void printUsageAndExit()
  {
    System.out.println( "Usage: java Fileserver <port> <document-root>" );
    System.exit(1);
  }
}

[Gaurav Chikara]

Hi Donal
I am also working on web server
I need your guidance
Since I make my web server program run
then in which directory shall i have to keep my html files so that
http://localhost
: port/index.html shows a browser page
I am facing the problem that even though I have placed default.html in same directory in which my class file is still I am getting FileNotFoundException
My server code is like this
package webserver;
import java.io.*;
import java.net.*;
import java.util.*;
/**
* <p>Title: </p>
* <p>Description: </p>
* <p>Copyright: Copyright (c) 2002</p>
* <p>Company: </p>
* @author unascribed
* @version 1.0
*/
public class FileServer {
static int port = 34;
public static void main(String[] args) throws IOException {
ServerSocket serverSocket = new ServerSocket(port);
Socket socket;
System.out.println( "Starting server on port " + port );
while(true){
socket = serverSocket.accept();
System.out.println("accepted");
HttpRequest httpRequest = new HttpRequest(socket);
// Thread thread = new Thread(httpRequest);
// thread.start();
InputStream in = socket.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(in));
DataInputStream din = new DataInputStream(new BufferedInputStream(in));
ArrayList arList = new ArrayList();
String requestLine = br.readLine();
System.out.println("br.readline()"+requestLine);
StringTokenizer stringTokenizer = new StringTokenizer(requestLine);
String method = stringTokenizer.nextToken();
String file = stringTokenizer.nextToken();
file = "."+file;
System.out.println("file"+file);
// PrintStream out = new PrintStream(new BufferedOutputStream(socket.getOutputStream()));
System.out.println("hello doctor");
try
{
FileInputStream fin = new FileInputStream(file);
System.out.println("reached here");
}
catch(FileNotFoundException ex) {
System.out.println("Not Found");
}
}//outer while
}//main
}
[ September 20, 2002: Message edited by: Gaurav Chikara ]