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- package lab_redes;
- import java.net.Socket;
- import java.io.*;
- import java.net.*;
- import java.util.*;
- import java.net.InetAddress.*;
- class HttpRequest implements Runnable {
- // Constants
- // Recognized HTTP methods
- final static class HTTP_METHOD
- {
- final static String GET = "GET";
- final static String HEAD = "HEAD";
- final static String POST = "POST";
- }
- final static String HTTPVERSION = "HTTP/1.0";
- final static String CRLF = "\r\n";
- Socket socket;
- // Constructor
- public HttpRequest(Socket socket) throws Exception
- {
- this.socket = socket;
- }
- public HttpRequest() {
- }
- // Implement the run() method of the Runnable interface.
- @Override
- public void run() {
- try {
- processRequest();
- } catch (Exception e) {
- System.out.println(e);
- }
- }
- private void processRequest() throws Exception
- {
- DataOutputStream os = new DataOutputStream(socket.getOutputStream());
- /* InputStream = An InputStreamReader is a bridge from byte streams to character streams: It reads
- bytes and decodes them into characters using a specified charset. The charset
- that it uses may be specified by name or may be given explicitly, or
- the platform's default charset may be accepted.*/
- /*
- BufferedReader = Reads text from a character-input stream, buffering characters so as
- to provide for the efficient reading of characters, arrays, and lines.
- */
- /*
- A data output stream lets an application write primitive Java data types to an
- output stream in a portable way. An application can then use a data
- input stream to read the data back in.
- */
- // Get the input and output streams of the socket.
- InputStream ins = socket.getInputStream();
- DataOutputStream outs = new DataOutputStream(socket.getOutputStream());
- // Set up input stream filters
- BufferedReader br = new BufferedReader(new InputStreamReader(ins));
- // Get the request line of the HTTP request
- String requestLine = br.readLine();
- // Display the request line
- System.out.println();
- System.out.println("Request:");
- 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;
- //we will use a try/catch construction to set the boolean variable fileExists to false. Later in the code, we
- //will use this flag to construct an error response message, rather than try to send a nonexistent file.
- // Open the requested file.
- FileInputStream fis = null;
- boolean fileExists = true;
- try {
- fis = new FileInputStream(fileName);
- } catch (FileNotFoundException e) {
- fileExists = false;
- }
- // Construct the response message.
- // Debug info for private use
- System.out.println("Partiu");
- System.out.println(requestLine);
- while ((headerLine = br.readLine()).length() != 0) {
- System.out.println(headerLine);
- }
- // Construct the response message.
- String statusLine = null;
- String contentTypeLine = null;
- String entityBody = null;
- if (fileExists) {
- statusLine = "HTTP/1.0 200 OK" + CRLF;
- contentTypeLine = "Content-Type: " +
- contentType(fileName) + CRLF;
- } else {
- statusLine = "HTTP/1.0 404 Not Found" + CRLF;
- contentTypeLine = "Content-Type: text/html" + CRLF;
- 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);
- fis.close();
- } else {
- os.writeBytes(entityBody) ;
- }
- // Close streams and socket.
- os.close();
- br.close();
- socket.close();
- }
- 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";
- }
- if(fileName.endsWith(".ram") || fileName.endsWith(".ra")) {
- return "audio/x-pn-realaudio";
- }
- return "application/octet-stream" ;
- }
- }
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