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- import java.io.* ;
- import java.net.* ;
- import java.util.* ;
- public final class webserver2
- {
- public static void main(String argv[]) throws Exception
- {
- // Set the port number.
- int port = 9999;
- // Establish the listen socket.
- ServerSocket welcomeSocket = new ServerSocket(port);
- // Process HTTP service requests in an infinite loop.
- while (true) {
- // Listen for a TCP connection request.
- Socket connectionSocket = welcomeSocket.accept();
- // Construct an object to process the HTTP request message.
- HttpRequest request = new HttpRequest( connectionSocket );
- // Create a new thread to process the request.
- Thread thread = new Thread(request);
- // Start the thread.
- thread.start();
- }}}
- final class HttpRequest implements Runnable
- {
- final static String CRLF = "\r\n";//returning carriage return (CR) and a line feed (LF)
- Socket socket;
- // Constructor
- public HttpRequest(Socket socket) throws Exception
- {
- this.socket = socket;
- }
- // Implement the run() method of the Runnable interface.
- //Within run(), we explicitly catch and handle exceptions with a try/catch block.
- public void run()
- {
- try {processRequest();}catch (Exception e) {System.out.println(e);}
- }
- private void processRequest() throws Exception
- {
- // Get a reference to the socket's input and output streams.
- InputStream instream = socket.getInputStream();
- DataOutputStream os = new DataOutputStream(socket.getOutputStream());
- // Set up input stream filters.
- // Page 169 10th line down or so...
- BufferedReader br = new BufferedReader(new InputStreamReader(instream));//reads the input data
- // Get the request line of the HTTP request message.
- String requestLine = br.readLine();// get /path/file.html version of http
- // Display the request line.
- System.out.println();
- System.out.println(requestLine);
- // HERE WE NEED TO DEAL WITH THE REQUEST
- // Extract the filename from the request line.
- StringTokenizer tokens = new StringTokenizer(requestLine);// this is a input method with deliminators
- tokens.nextToken(); // skip over the method, which should be "GET"
- String fileName = tokens.nextToken();
- // Prepend a "." so that file request is within the current directory.
- fileName = "." + 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/1.0 200 OK" + CRLF; //common success message
- contentTypeLine = "Content-type: " + contentType( fileName ) + CRLF;}//content info
- else {
- statusLine = "HTTP/1.0 404 Not Found" + CRLF;//common error message
- contentTypeLine = "Content-type: " + "text/html" + CRLF;//content info
- entityBody = "<HTML>" +
- "<HEAD><TITLE>Not Found</TITLE></HEAD>" +
- "<BODY>Not Found</BODY></HTML>";
- }
- //Send the status line.
- os.writeBytes(statusLine);
- //Send the content type line.
- os.writeBytes(contentTypeLine);
- //Send a blank line to indicate the end of the header lines.
- os.writeBytes(CRLF);
- //Send the entity body.
- if (fileExists) {
- sendBytes(fis, os);
- os.writeBytes(statusLine);//Send the status line.
- os.writeBytes(contentTypeLine);//Send the content type line.
- fis.close();
- } else {
- os.writeBytes(statusLine);//Send the status line.
- os.writeBytes(entityBody);//Send the an html error message info body.
- os.writeBytes(contentTypeLine);//Send the content type line.
- }
- System.out.println("*****");
- System.out.println(fileName);//print out file request to console
- System.out.println("*****");
- // Get and display the header lines.
- String headerLine = null;
- while ((headerLine = br.readLine()).length() != 0) {
- System.out.println(headerLine);
- }
- //code from part 1
- // Right here feed the client something
- //os.writeBytes("<html><body><h1>My First Heading</h1>");
- //os.writeBytes( "<p>My first paragraph.</p></body></html> ");
- //os.flush();
- // Close streams and socket.
- os.close();
- br.close();
- socket.close();
- }
- //return the file types
- private static String contentType(String fileName)
- {
- if(fileName.endsWith(".htm") || fileName.endsWith(".html")) {return "text/html";}
- if(fileName.endsWith(".jpg") || fileName.endsWith(".jpeg")) {return "image/jpeg";}
- if(fileName.endsWith(".gif")) {return "image/gif";}
- return "application/octet-stream";
- }
- //set up input output streams
- private static void sendBytes(FileInputStream fis, OutputStream os) throws Exception
- {
- // Construct a 1K buffer to hold bytes on their way to the socket.
- byte[] buffer = new byte[1024];
- int bytes = 0;
- // Copy requested file into the socket's output stream.
- while((bytes = fis.read(buffer)) != -1 )// read() returns minus one, indicating that the end of the file
- {
- os.write(buffer, 0, bytes);
- }}
- }
- //by rutera.org
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