java socket实现Http服务器

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.net.Socket;
public class Processor extends Thread{
private Socket socket;
private InputStream in;
private PrintStream out;
public final static String WEB_ROOT="c:\\workspace\\webserver\\htdocs";
public Processor(Socket socket){
   this.socket=socket;
   try {
    in=socket.getInputStream();
    out=new PrintStream(socket.getOutputStream());
   } catch (IOException e) {
    e.printStackTrace();
   }
}

public void run(){
 
   String filename=parse(in);
   sendFile(filename);
   }


public String parse(InputStream in){
 
   BufferedReader br=new BufferedReader(new InputStreamReader(in));
   String filename=null;
 
   try {
    String httpMessage=br.readLine();
    String[] content=httpMessage.split(" ");
    if(content.length!=3){
     sendErrorMessage(400,"Client query error!");
     return null;
    }
  
    System.out.println("code:"+content[0]+",fileName"+content[1]+",http version:"+content[2]);
    filename=content[1];
   } catch (IOException e) {
    e.printStackTrace();
   }
   return filename;
}

public void sendErrorMessage(int errorCode,String errorMessage){
 
   out.println("HTTP/1.0"+errorCode+" "+errorMessage);
   out.println("content-type: text/html");
   out.println();
   out.println("");
   out.println("Error Message");
   out.println("");
   out.println("");
   out.println("ErrorCode:"+errorCode+",Message:"+errorMessage+"");
   out.println("");
   out.println("");
   out.flush();
   out.close();
   try {
    in.close();
   } catch (IOException e) {
    e.printStackTrace();
   }
}
public void sendFile(String filename){
   File file=new File(Processor.WEB_ROOT+filename);
   if(!file.exists()){
    sendErrorMessage(404,"File Not Found!");
    return;
   }
   try {
    InputStream in=new FileInputStream(file);
    byte content[]=new byte[(int)file.length()];
    in.read(content);
    out.println("HTTP/1.0 200 queryfile");
    out.println("conrtent=length:"+content.length);
    out.println();
    out.write(content);
    out.flush();
    out.close();
    in.close();
  
   } catch (FileNotFoundException e) {
    e.printStackTrace();
   } catch (IOException e) {
    e.printStackTrace();
   }
 
}
}


2.WebServer.java
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;

public void serverStart(int port) {
   try {
    ServerSocket serverSocket = new ServerSocket(port);
    while (true) {
     Socket socket = serverSocket.accept();
     new Processor(socket).start();
    }
   } catch (IOException e) {
    e.printStackTrace();
   }
}
public static void main(String[] args) {
   int port = 80;
   if (args.length == 1) {
    port = Integer.parseInt(args[0]);
   }
   new WebServer().serverStart(port);
}
}