??? /**
???? * 方法名稱：runServer<p>
???? * 方法功能：運行代理服務器<p>
???? * 參數說明： <p>
???? * 返回：void <p>
???? * 作者：李明
???? * 日期：2006年3月9日
???? * @throws IOException
???? */
??? public void runServer() throws IOException
??? {
??????? // 創建代理服務器監聽,端口默認為9999(可以通過屬性文檔修改其他端口)
??????? ServerSocket ss = new ServerSocket(localport);
??????? final com.zte.ums.zxnm01.cpe.common.http.ProxyUtil proxyUtil = new com.zte.ums.zxnm01.cpe.common.http.ProxyUtil();
??????? final byte[] request = new byte[1024];
??????? byte[] reply = new byte[4096];

??????? while(true)
??????? {
??????????? Socket client = null, server = null;
??????????? try
??????????? {
??????????????? // 等待客戶連接
??????????????? client = ss.accept();
??????????????? log.info("*******Client logon*******");
??????????????? log.info(client);
??????????????? final InputStream streamFromClient = client.getInputStream();
??????????????? final OutputStream streamToClient = client.getOutputStream();

??????????????? // 連接真實的服務器,如果不能連接成功,將向客戶發送錯誤信息,斷開本次連接
??????????????? // 并且繼續等待連接.
??????????????? try
??????????????? {
??????????????????? server = new Socket(host, remoteport);
??????????????? }
??????????????? catch(IOException e)
??????????????? {
??????????????????? PrintWriter out = new PrintWriter(streamToClient);
??????????????????? out.print("Proxy server cannot connect to " + host + ":" + remoteport + ":\n" + e + "\n");
??????????????????? out.flush();
??????????????????? client.close();
??????????????????? continue;
??????????????? }

??????????????? // 得到連接服務器的輸入輸出流.
??????????????? final InputStream streamFromServer = server.getInputStream();
??????????????? final OutputStream streamToServer = server.getOutputStream();

??????????????? // 構建一個單獨線程讀客戶請求并傳給服務器,此線程為異步.
??????????????? Thread t = new Thread()
??????????????? {
??????????????????? public void run()
??????????????????? {
??????????????????????? int bytesRead;
??????????????????????? String context = null;
??????????????????????? try
??????????????????????? {
??????????????????????????? while((bytesRead = streamFromClient.read(request)) != -1)
??????????????????????????? {
??????????????????????????????? streamToServer.write(request, 0, bytesRead);
??????????????????????????????? context = new String(request).trim();
??????????????????????????????? streamToServer.flush();
??????????????????????????? }
??????????????????????????? // 打印客戶瀏覽器發來的信息
??????????????????????????? log.info("#################S##############");
??????????????????????????? log.info(context);
??????????????????????????? log.info("#################E##############");
??????????????????????????? // 解析發來的信息,獲取請求的主機地址和端口.
??????????????????????????? proxyUtil.setUrl(context);
??????????????????????????? host = proxyUtil.getHost();
??????????????????????????? remoteport = proxyUtil.getPort();
??????????????????????????? log.info("host : '" + host + "'" + " port : '" + remoteport + "'");

??????????????????????? }
??????????????????????? catch(IOException e)
??????????????????????? {
??????????????????????????? // e.printStackTrace();
??????????????????????? }

??????????????????????? // 關閉請求服務器連接,屏蔽無意義的異常,減少代理服務器負擔.
??????????????????????? try
??????????????????????? {
??????????????????????????? streamToServer.close();
??????????????????????? }
??????????????????????? catch(IOException e)
??????????????????????? {
??????????????????????????? // e.printStackTrace();
??????????????????????? }
??????????????????? }
??????????????? };

??????????????? // 開啟客戶端到服務器請求線程
??????????????? t.start();

??????????????? // 讀服務器的請求,成功后返回信息給客戶端.
??????????????? int bytesRead;
??????????????? try
??????????????? {
??????????????????? while((bytesRead = streamFromServer.read(reply)) != -1)
??????????????????? {
??????????????????????? streamToClient.write(reply, 0, bytesRead);
??????????????????????? streamToClient.flush();
??????????????????? }
??????????????? }
??????????????? catch(IOException e)
??????????????? {
??????????????????? // e.printStackTrace();
??????????????? }

??????????????? // 關閉客戶連接.
??????????????? streamToClient.close();
??????????? }
??????????? catch(IOException e)
??????????? {
??????????????? System.err.println(e);
??????????? }
??????????? finally
??????????? {
??????????????? try
??????????????? {
??????????????????? if(server != null)
??????????????????? {
??????????????????????? server.close();
??????????????????? }
??????????????????? if(client != null)
??????????????????? {
??????????????????????? client.close();
??????????????????? }
??????????????? }
??????????????? catch(IOException e)
??????????????? {
??????????????????? e.printStackTrace();
??????????????? }
??????????? }
??????? }
??? }