Http服務(wù)器主要由三個(gè)類構(gòu)成：HttpServer、Request和Response。其中程序的入口在HttpServer類，它調(diào)用await()方法，使得Server開始等候客戶端的連接。當(dāng)客戶端連接后，它將把靜態(tài)的頁面內(nèi)容發(fā)送給客戶端瀏覽器。下面分別介紹這三個(gè)類：
1：HttpServer類
     HttpServer需要有一個(gè)服務(wù)器的根目錄這在WEB_ROOT變量中定義的：
public static final String WEB_ROOT =System.getpublic void await() {
    ServerSocket serverSocket = null;
    int port = 8080;
    try {
      serverSocket =  new ServerSocket(port, 1, InetAddress.getByName("127.0.0.1"));
    }
    catch (IOException e) {
      e.printStackTrace();
      System.exit(1);
    }

    // Loop waiting for a request
    while (!shutdown) {
      Socket socket = null;
      InputStream input = null;
      OutputStream output = null;
      try {
        socket = serverSocket.accept();
        input = socket.getInputStream();
        output = socket.getOutputStream();

        // create Request object and parse
        Request request = new Request(input);
        request.parse();

        // create Response object
        Response response = new Response(output);
        response.setRequest(request);
        response.sendStaticResource();

        // Close the socket
        socket.close();

        //check if the previous URI is a shutdown command
        shutdown = request.getUri().equals(SHUTDOWN_COMMAND);
      }
      catch (Exception e) {
        e.printStackTrace();
        continue;
      }
    }
  }
await()方法內(nèi)構(gòu)造一個(gè)ServerSocket的實(shí)例，等客戶端連接進(jìn)來的時(shí)候把socket.getInputStream()傳遞給Request類進(jìn)行解析，把socket.getOutputStream()傳遞給Response類，然后再把request對象傳遞給Response，最后調(diào)用Response.sendStaticResource()方法發(fā)送數(shù)據(jù)給客戶端。socket.close()后監(jiān)測是不是接受到了關(guān)閉Server的命令，假如是的話跳出循環(huán)結(jié)束程序。