Java實現簡單web服務器

　　該程序簡單實現web服務器目前僅支持html和gif/jpeg格式下面是代碼

　　import javaio* ;

　　import * ;

　　import javautil* ;

　　public class SimpleWebServer {

　　public static void main(String argv[]) throws Exception {

　　//Get the port as an argument

　　// Also you could hard code the port to point to or any other port

　　int port = (new Integer(argv[]))intValue();

　　// Establish the listen socket

　　ServerSocket socket = new ServerSocket(port);

　　while(true){

　　// Listen for a TCP connection request

　　Socket connection = socketaccept();

　　processRequest(connection);

　　}

　　private static void processRequest(Socket connection) throws Exception {

　　final String CRLF = \r\n;

　　Socket socket = connection;

　　// Get a reference to the sockets input and output streams

　　InputStream is = socketgetInputStream();

　　DataOutputStream os = new DataOutputStream(socketgetOutputStream());

　　// Set up input stream filters

　　BufferedReader br = new BufferedReader(new InputStreamReader(is));

　　// Get the request line of the HTTP request message

　　String requestLine = brreadLine();

　　// Extract the filename from the request line

　　StringTokenizer tokens = new StringTokenizer(requestLine);

　　tokensnextToken(); // skip over the method which should be GET

　　String fileName = tokensnextToken();

　　// Prepend a so that file request is within the current directory

　　fileName = /root/ + 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 statusLine = null;

　　String contentTypeLine = null;

　　String entityBody = null;

　　if (fileExists) {

　　statusLine = HTTP/ OK + CRLF;

　　contentTypeLine = ContentType: +

　　contentType(fileName) + CRLF;

　　} else {

　　statusLine = HTTP/ Not Found + CRLF;

　　contentTypeLine = ContentType: text/html + CRLF;

　　entityBody = <HTML> +

　　<HEAD><TITLE>Not Found</TITLE></HEAD> +

　　<BODY>Not Found</BODY></HTML>;

　　}

　　// Send the status line

　　oswriteBytes(statusLine);

　　// Send the content type line

　　oswriteBytes(contentTypeLine);

　　// Send a blank line to indicate the end of the header lines

　　oswriteBytes(CRLF);

　　// Send the entity body

　　if (fileExists) {

　　sendBytes(fis os);

　　fisclose();

　　} else {

　　fileExists = false;

　　oswriteBytes(entityBody) ;

　　}

　　// Close streams and socket

　　osclose();

　　brclose();

　　socketclose();

　　}

　　private static void sendBytes(FileInputStream fis

　　OutputStream os) throws Exception {

　　// Construct a K buffer to hold bytes on their way to the socket

　　byte[] buffer = new byte[];

　　int bytes = ;

　　// Copy requested file into the sockets output stream

　　while ((bytes = fisread(buffer)) != ) {

　　oswrite(buffer bytes);

　　}

　　private static String contentType(String fileName) {

　　if(fileNameendsWith() || fileNameendsWith(l)) {

　　return text/html;

　　}

　　else if (fileNameendsWith(gif)) {

　　return image/gif;

　　}

　　else if (fileNameendsWith(jpg) || fileNameendsWith(jpeg)){

　　return image/jpeg;

　　}

　　return application/octetstream ;

　　}

From:http://tw.wingwit.com/Article/program/Java/hx/201311/25715.html