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The SimpleWebServer object has two important pieces of data (also called data members), as shown here: 21 22 23 24 25 26 /* Run the HTTP server on this TCP port. */ private static final int PORT = 8080; /* The socket used to process incoming connections from web clients. */ private static ServerSocket dServerSocket;
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The first is the port number that the web server should listen to for connections from clients. The PORT variable is simply a constant that is initialized to 8080. (Typically, only system administrators are allowed to run programs that use ports less than 1024.) Usually, clients would be able to connect to the simple web server using a URL, or web address, such as http://machinename.yourdomain.com/. The browser automatically assumes port 80, but you can specify a different port, such as 8080, by appending a colon followed by the desired port number in the URL, http://machinename.yourdomain.com:8080. The second important data member is dServerSocket. The dServerSocket data member is a socket to which clients can connect. Think of it as being like an electrical socket. Both web browser clients and web servers have a virtual power strip with many sockets on them. A client can talk to a server by selecting one of its own sockets, selecting one of the server s sockets, and establishing a connection between the two by plugging a virtual wire into each end. However, since we would not want each client to have to worry about choosing a unique port number on the server so that they don t interfere with each other, the ServerSocket object will take connections from many clients connecting to the same port number in our case, 8080. When a client expresses its desire to connect to the port number, the ServerSocket object manages assigning each client some unique port from the server s frame of reference.
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We now describe the processRequest() method that is called once the client connects:
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/* Reads the HTTP request from the client and responds with the file the user requested or an HTTP error code. */ public void processRequest(Socket s) throws Exception { /* Used to read data from the client. */ BufferedReader br = new BufferedReader ( new InputStreamReader (s.getInputStream())); /* Used to write data to the client. */ OutputStreamWriter osw = new OutputStreamWriter (s.getOutputStream()); /* Read the HTTP request from the client. */ String request = br.readLine(); String command = null; String pathname = null; /* Parse the HTTP request. */ StringTokenizer st = new StringTokenizer (request, " "); command = st.nextToken(); pathname = st.nextToken(); if (command.equals("GET")) { /* If the request is a GET, try to respond with the file the user is requesting. */ serveFile (osw,pathname); } else { /* If the request is a NOT a GET, return an error saying this server does not implement the requested command. */ osw.write ("HTTP/1.0 501 Not Implemented\n\n"); } /* Close the connection to the client. */ osw.close(); }
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The processRequest() method takes the client socket as input. It uses the client socket to create the BufferedReader and OutputStreamWriter objects that allow it to read data from and send data to the client, respectively. Once these communication objects have been
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created, the processRequest() method attempts to read a line of input from the client using the BufferedReader. We expect that the first line of data that the client sends the server is an HTTP GET request, as described previously. The StringTokenizer object, st, is used to break up the request into its constituent parts: the command (i.e., GET) and the pathname to the file that the client would like to download. If the command is a GET request, as expected, the serveFile() method is called to load the file into the server s memory and send it to the client. If the command is not a GET request, an appropriate HTTP error response is sent to the client.
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