Java question
jontha11
httprequest.javaimport java.io.* ; import java.net.* ; import java.util.* ; final class HttpRequest implements Runnable { final static String CRLF = "\r\n"; Socket socket; // Constructor public HttpRequest(Socket socket) throws Exception { this.socket = socket; } // Implement the run() method of the Runnable interface. public void run() { try { processRequest(); } catch (Exception e) { System.out.println(e); } } 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 ) { os.write(buffer, 0, bytes); } } private static String contentType(String fileName) { if(fileName.endsWith(".htm") || fileName.endsWith(".html")) { return "text/html"+CRLF; } if(fileName.endsWith(".gif")) { return "image/gif"+CRLF; } if(fileName.endsWith(".jpg")) { return "image/jpeg"+CRLF; } return "application/octet-stream"; } //. . . private void processRequest() throws Exception { // Get a reference to the socket's input and output streams. InputStream is = socket.getInputStream(); DataOutputStream os = new DataOutputStream(socket.getOutputStream()); // Set up input stream filters. //? BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream())); // Get the request line of the HTTP request message. String requestLine = br.readLine(); // Display the request line. System.out.println(); System.out.println(requestLine); // Get and display the header lines. String headerLine = null; while ((headerLine = br.readLine()).length() != 0) { System.out.println(headerLine); // Extract the filename from the request line. StringTokenizer tokens = new StringTokenizer(requestLine); 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/1.1 200 OK"; contentTypeLine = "Content-type: " + contentType( fileName ) + CRLF; // Send the status line. os.writeBytes(statusLine); // Send the content type line. os.writeBytes(contentType(fileName)); // Send a blank line to indicate the end of the header lines. os.writeBytes(CRLF); } else { statusLine = "404 Not Found" ; contentTypeLine = "Unkown"; entityBody = "<HTML>" + "<HEAD><TITLE>Not Found</TITLE></HEAD>" + "<BODY>Not Found</BODY></HTML>"; } // Send the entity body. if (fileExists) { sendBytes(fis, os); fis.close(); } else { os.writeBytes("HTML-encoded error"); } // Close streams and socket. os.close(); br.close(); socket.close(); } } }
