笔记：

　　1.等待接受连接：java.net.Socket socket =  java.net.ServerSocket.accept()

　　2.处理连接：通过socket.getInputStream()把客户端HTTP传过来的信息封装成javax.servlet.http.HttpServletRequest对象

　　3.Tomcat4 的默认连接器httpConnector

只负责获取socket，给processor线程异步处理，马上返回以便下一个前来的 HTTP 请求可以被处理

// Hand this socket off to an appropriate processor            HttpProcessor processor = createProcessor();            if (processor == null) {                try {                    log(sm.getString("httpConnector.noProcessor"));                    socket.close();                } catch (IOException e) {                    ;                }                continue;            }            //            if (debug >= 3)            //                log("run: Assigning socket to processor " + processor);            processor.assign(socket);

 

这里是 HttpProcessor 类的 assign 和 await 方法

　　

/**

* Process an incoming TCP/IP connection on the specified socket. Any

* exception that occurs during processing must be logged and swallowed.

* <b>NOTE</b>: This method is called from our Connector's thread. We

* must assign it to our own thread so that multiple simultaneous

* requests can be handled.

*

* @param socket TCP socket to process

*/

　　synchronized void assign(Socket socket) {        // Wait for the Processor to get the previous Socket        while (available) {            try {                wait();            } catch (InterruptedException e) {            }        }        // Store the newly available Socket and notify our thread        this.socket = socket;        available = true;        notifyAll();        if ((debug >= 1) && (socket != null))            log(" An incoming request is being assigned");    }

/**     * Await a newly assigned Socket from our Connector, or null     * if we are supposed to shut down.     */    private synchronized Socket await() {        // Wait for the Connector to provide a new Socket        while (!available) {            try {                wait();            } catch (InterruptedException e) {            }        }        // Notify the Connector that we have received this Socket        Socket socket = this.socket;        available = false;        notifyAll();        if ((debug >= 1) && (socket != null))            log("  The incoming request has been awaited");        return (socket);    }