Below sample is very simple and easy to understand for creating a simple web server. The original link is:
http://bethecoder.com/applications/tutorials/java/socket-programming/simple-web-server.html
Type http://localhost:8888 in your browser to browse server page.
Simple Web Server
This turoial shows how to build a prototypic web server using java socket programming. Here the web server is implemented as a stand alone java application with a single java class and client is nothing but the web browser.
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import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
public class SimpleWebServer {
public static final int DEFAULT_WEB_SERVER_PORT = 6666;
private int webServerPort = DEFAULT_WEB_SERVER_PORT;
private int webServerRequestCount = 0;
private ServerSocket webServerSocket;
public SimpleWebServer(int webServerPort) {
this.webServerPort = webServerPort;
this.webServerRequestCount = 0;
}
/**
* Start the web server
*/
protected void start() {
log("Starting web server on port : " + webServerPort);
try {
//Web server socket creation
webServerSocket = new ServerSocket(webServerPort);
log("Started web server on port : " + webServerPort);
/**
* Wait for clients
*/
listen();
} catch (Exception e) {
hault("Error: " + e);
}
}
/**
* Listening on webServerPort for the clients to connect.
*/
protected void listen() {
log("Waiting for connection");
while (true) {
try {
// Got a connection request from client
Socket client = webServerSocket.accept();
webServerRequestCount ++;
//Handle client request
//This processing can be in a separate Thread
//if we would like to handle multiple requests
//in parallel.
serveClient(client);
} catch (Exception e) {
log("Error: " + e);
}
}
}
protected void serveClient(Socket client) throws IOException {
/**
* Read the client request (parse the data if required)
*/
readClientRequest(client);
/**
* Send the response back to the client.
*/
writeClientResponse(client);
}
protected void readClientRequest(Socket client) throws IOException {
log("\n--- Request from : " + client + " ---");
/**
* Read the data sent by client.
*/
BufferedReader in = new BufferedReader(
new InputStreamReader(client.getInputStream()));
// read the data sent. We basically ignore it,
// stop reading once a blank line is hit. This
// blank line signals the end of the client HTTP
// headers.
String str = ".";
while (!str.equals("")) {
str = in.readLine();
log(str);
}
}
protected void writeClientResponse(Socket client) throws IOException {
PrintWriter out = new PrintWriter(client.getOutputStream());
// Send the response
// Send the headers
out.println("HTTP/1.0 200 OK");
out.println("Content-Type: text/html");
out.println("Server: SimpleWebServer");
// this blank line signals the end of the headers
out.println("");
// Send the HTML page
out.println("<CENTER>");
out.println("<H1 style='color:red'>Welcome to SimpleWebServer<H1>");
out.println("<H2>This page has been visited <span style='color:blue'>" +
webServerRequestCount + " time(s)</span></H2>");
out.println("</CENTER>");
out.flush();
client.close();
}
private static void log(String msg) {
System.out.println(msg);
}
private static void hault(String msg) {
System.out.println(msg);
System.exit(0);
}
public static void main(String args[]) {
/**
* Start web server on port '8888'
*/
SimpleWebServer ws = new SimpleWebServer(8888);
ws.start();
}
} |
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