📄 httprequest.java
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import 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 void processRequest() throws Exception {
// Get a reference to the socket's input and output streams.
InputStream is = ?;
DataOutputStream os = ?;
// Set up input stream filters.
BufferedReader br = ?;
// Get the request line of the HTTP request message.
String 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();
// 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 = ?;
contentTypeLine = "Content-type:"+contentType(fileName)+CRLF;
} else {
statusLine = ?;
contentTypeLine = ?
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(?);
// 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(?) ;
}
// 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(?) {
?;
}
if(?){
?;
}
return "application/octet-stream" ;
}
}
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