webserver.java

java实现的简单的Webserver

import java.io.*;
import java.net.*;
import java.util.*;
class WebServer
{
	public static void main(String argv[])throws Exception
	{
		String requestMessageLine;
		String fileName;
		ServerSocket listenSocket = new ServerSocket(8080);
		Socket connectionSocket = listenSocket.accept();
		BufferedReader inFromClient = new BufferedReader(new InputStreamReader(connectionSocket.getInputStream()));
		DataOutputStream OutToClient = new DataOutputStream(connectionSocket.getOutputStream());
		requestMessageLine = inFromClient.readLine();
		StringTokenizer tokenizedLine = new StringTokenizer(requestMessageLine);
		
		if(tokenizedLine.nextToken().equals("GET"))
		{
			fileName = tokenizedLine.nextToken();
			if(fileName.startsWith("/") == true)
			{
				fileName = fileName.substring(1);
			}
			File  file = new File(fileName);
			int numOfBytes = (int)file.length();
			FileInputStream inFile = new FileInputStream(fileName);
			byte[] fileInBytes = new byte[numOfBytes];
			inFile.read(fileInBytes);
			OutToClient.writeBytes("HTTP/1.0 200 Document Follows\r\n");
			if(fileName.endsWith(".jpg"))
			{
				OutToClient.writeBytes("Content-Type:image/jpeg\r\n");
			}
			if(fileName.endsWith(".gif"))
			{
				OutToClient.writeBytes("Content-Type:image/gif\r\n");
			}
			OutToClient.writeBytes("Content-Length:"+numOfBytes+"\r\n");
			OutToClient.writeBytes("\r\n");
			OutToClient.write(fileInBytes,0,numOfBytes);
			connectionSocket.close();	
		}
		else
			System.out.println("Bad Request Messages");
	}
}