📄 webserver.java
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import java.io.* ;
import java.net.* ;
import java.util.* ;
public final class WebServer
{
public static void main(String argv[]) throws Exception
{
int port = 9998;
ServerSocket listenSocket =
new ServerSocket (port);
while (true) {
// Listen for a TCP connection request.
Socket connectionSocket =
listenSocket.accept();
HttpRequest request = new HttpRequest( connectionSocket );
// Create a new thread to process the request.
Thread thread = new Thread( request );
// Start the thread.
thread.start();
}
}
}
/*HttpRequest*/
final class HttpRequest implements Runnable
{
final static String CRLF = "\r\n";
Socket socket;
// Constructor
public HttpRequest(Socket socket) throws Exception
{
this.socket = socket;
System.out.print("socket receive");
}
// 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.
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;
System.out.println(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";
contentTypeLine = "Content-Type:" +
contentType( fileName ) + CRLF;
} else {
statusLine = "HTTP/1.0 404 Bad Request";
contentTypeLine = "Content-Type:" +
"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();
}
private static void sendBytes(FileInputStream fis, DataOutputStream 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(".jpg")) {
return "image/jpeg";
}
if(fileName.endsWith(".gif")) {
return "image/gif";
}
if(fileName.endsWith(".txt")) {
return "image/txt";
}
return "application/octet-stream";
}
}
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