webserver.java

简单的用Java做的Web服务器

import java.io.*;
import java.net.*;
import java.util.*;

public class WebServer {
	public static void main(String[] args) 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-Lenth:"+numOfBytes+"\r\n");
			outToClient.writeBytes("\r\n");
			outToClient.write(fileInBytes,0,numOfBytes);
			connectionSocket.close();
		}
		else System.out.println("Bad Request Message");

	}

}