📄 webserverdemo.java
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import java.io.*;
import java.net.*;
import java.util.*;
public class WebServerDemo
{
// Directory of HTML pages and other files
protected String docroot;
// Port number of web server
protected int port;
// Socket for the web server
protected ServerSocket ss;
// Handler for a HTTP request
class Handler extends Thread
{
protected Socket socket;
protected PrintWriter pw;
protected BufferedOutputStream bos;
protected BufferedReader br;
protected File docroot;
public Handler(Socket _socket, String _docroot) throws Exception
{
socket=_socket;
// Get the absolute directory of the filepath
docroot=new File(_docroot).getCanonicalFile();
}
public void run()
{
try
{
// Prepare our readers and writers
br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
bos = new BufferedOutputStream(socket.getOutputStream());
pw = new PrintWriter(new OutputStreamWriter(bos));
// Read HTTP request from user (hopefully GET /file...... )
String line = br.readLine();
// Shutdown any further input
socket.shutdownInput();
if(line == null)
{
socket.close();
return;
}
if(line.toUpperCase().startsWith("GET"))
{
// Eliminate any trailing ? data, such as for a CGI GET request
StringTokenizer tokens = new StringTokenizer(line," ?");
tokens.nextToken();
String req = tokens.nextToken();
// If a path character / or \ is not present, add it to the document root
// and then add the file request, to form a full filename
String name;
if(req.startsWith("/") || req.startsWith("\\"))
name = this.docroot+req;
else
name = this.docroot+File.separator+req;
// Get absolute file path
File file = new File(name).getCanonicalFile();
// Check to see if request doesn't start with our document root ....
if(!file.getAbsolutePath().startsWith(this.docroot.getAbsolutePath()))
{
pw.println("HTTP/1.0 403 Forbidden");
pw.println();
}
// ... if it's missing .....
else if(!file.exists())
{
pw.println("HTTP/1.0 404 File Not Found");
pw.println();
}
// ... if it can't be read for security reasons ....
else if(!file.canRead())
{
pw.println("HTTP/1.0 403 Forbidden");
pw.println();
}
// ... if its actually a directory, and not a file ....
else if(file.isDirectory())
{
sendDir(bos,pw,file,req);
}
// ... or if it's really a file
else
{
sendFile(bos, pw, file.getAbsolutePath());
}
}
// If not a GET request, the server will not support it
else
{
pw.println("HTTP/1.0 501 Not Implemented");
pw.println();
}
pw.flush();
bos.flush();
}
catch(Exception e)
{
e.printStackTrace();
}
try
{
socket.close();
}
catch(Exception e)
{
e.printStackTrace();
}
}
protected void sendFile(BufferedOutputStream bos, PrintWriter pw, String filename) throws Exception
{
try
{
java.io.BufferedInputStream bis = new java.io.BufferedInputStream(new FileInputStream(filename));
byte[] data = new byte[10*1024];
int read = bis.read(data);
pw.println("HTTP/1.0 200 Okay");
pw.println();
pw.flush();
bos.flush();
while(read != -1)
{
bos.write(data,0,read);
read = bis.read(data);
}
bos.flush();
}
catch(Exception e)
{
pw.flush();
bos.flush();
}
}
protected void sendDir(BufferedOutputStream bos, PrintWriter pw, File dir, String req) throws Exception
{
try
{
pw.println("HTTP/1.0 200 Okay");
pw.println();
pw.flush();
pw.print("<html><head><title>Directory of ");
pw.print(req);
pw.print("</title></head><body><h1>Directory of ");
pw.print(req);
pw.println("</h1><table border=\"0\">");
File[] contents=dir.listFiles();
for(int i=0;i<contents.length;i++)
{
pw.print("<tr>");
pw.print("<td><a href=\"");
pw.print(req);
pw.print(contents[i].getName());
if(contents[i].isDirectory())
pw.print("/");
pw.print("\">");
if(contents[i].isDirectory())
pw.print("Dir -> ");
pw.print(contents[i].getName());
pw.print("</a></td>");
pw.println("</tr>");
}
pw.println("</table></body></html>");
pw.flush();
}
catch(Exception e)
{
pw.flush();
bos.flush();
}
}
}
// Check that a filepath has been specified and a port number
protected void parseParams(String[] args) throws Exception
{
switch(args.length)
{
case 1:
case 0:
System.err.println ("Syntax: <jvm> "+this.getClass().getName()+" docroot port");
System.exit(0);
default:
this.docroot = args[0];
this.port = Integer.parseInt(args[1]);
break;
}
}
public WebServerDemo(String[] args) throws Exception
{
System.out.println ("Checking for paramters");
// Check for command line parameters
parseParams(args);
System.out.print ("Starting web server...... ");
// Create a new server socket
this.ss = new ServerSocket(this.port);
System.out.println ("OK");
for (;;)
{
// Accept a new socket connection from our server socket
Socket accept = ss.accept();
// Start a new handler instance to process the request
new Handler(accept, docroot).start();
}
}
// Start an instance of the web server running
public static void main(String[] args) throws Exception
{
WebServerDemo webServerDemo = new WebServerDemo(args);
}
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