HttpRequest.java
package clavetter;
import java.io.*;
import java.net.*;
import java.util.*;
public final class HttpRequest implements Runnable {
final static String CRLF = "\r\n";
Socket socket;
//constructor
public HttpRequest(Socket socket) throws Exception
{
this.socket = socket;
}
public void run()
{
try{
processRequest();
} catch(Exception e) {
System.out.println(e);
}
}
private void processRequest() throws Exception
{
InputStream is = socket.getInputStream();
DataOutputStream os = new DataOutputStream(socket.getOutputStream());
//Setup input stream filters
BufferedReader br = new BufferedReader(new InputStreamReader(is));
//Get the request line of HTTP request message
String requestLine = br.readLine();
System.out.println();
System.out.println(requestLine);
// 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();
System.out.println(fileName);
// Prepend a "." so that file request is within the current directory.
fileName = "." + fileName;
//comment out when done
// Get and display the header lines.
//String headerLine = null;
//while ((headerLine = br.readLine()).length() != 0) {
//System.out.println(headerLine);
// }
//comment ^^^^^ out when done
// 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;
} else {
statusLine = "HTTP/1.1 404 Not Found: ";
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);
}
DataOutputStream outToClient = new DataOutputStream(socket.getOutputStream());
outToClient.writeBytes("HTTP/1.1 200 OK");
outToClient.writeBytes("Content-Length: 100");
outToClient.writeBytes("Content-Type: text/html\n\n");
outToClient.writeBytes("<html><body><h1>My First Heading</h1><p>My first paragraph</p></body></html>");
outToClient.close();
os.close();
br.close();
socket.close();
}
private static String contentType(String fileName)
{
if(fileName.endsWith(".htm") || fileName.endsWith(".html")) {
return "text/html";
}
if(fileName.endsWith(".png")) {
return "image/png";
}
if(fileName.endsWith(".gif")) {
return "image/gif";
}
if(fileName.endsWith(".jpg")|| fileName.endsWith(".jpeg")) {
return "image/jpeg";
}
return "application/octet-stream";
}
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);
}
}
}
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