public class ProxyServer
{

??? private static final int PORT = 9999;

??? private ByteBuffer buffer = ByteBuffer.allocate(10240);

??? private ProxyUtil proxyUtil = new ProxyUtil();

??? private static String remoteHost = "";

??? private static int remotePort = 80;

??? private Logger log = ZXLogger.getLogger(ProxyServer.class.getName());

??? //private Log log = LogFactory.getLog(ProxyServer.class);

??? public ProxyServer()
??? {
??????? //PropertyConfigurator.configure("src/log4j.properties");
??? }

??? /**
???? * 方法名稱：start <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 <p>
???? * 日期：2006年3月23日 <p>
???? */
??? public void runServer()
??? {

??????? ServerSocket sSocket = null;
??????? ServerSocketChannel ssc = null;

??????? // 代理服務器監聽開啟

??????? Selector selector = null;
??????? try
??????? {
??????????? ssc = ServerSocketChannel.open();
??????????? sSocket = ssc.socket();
??????????? sSocket.bind(new InetSocketAddress(PORT));

??????????? selector = Selector.open();

??????????? System.err.println("Listening Port is " + PORT);

??????????? ssc.configureBlocking(false);
??????????? ssc.register(selector, SelectionKey.OP_ACCEPT);
??????? }
??????? catch(ClosedChannelException e1)
??????? {
??????????? // TODO Auto-generated catch block
??????????? e1.printStackTrace();
??????? }
??????? catch(IOException e1)
??????? {
??????????? // TODO Auto-generated catch block
??????????? e1.printStackTrace();
??????? }

??????? try
??????? {
??????????? while(true)
??????????? {

??????????????? int n = selector.select();

??????????????? if(n == 0)
??????????????? {
??????????????????? continue; // nothing to do
??????????????? }

??????????????? Set set = selector.selectedKeys();

??????????????? Iterator iter = set.iterator();

??????????????? while(iter.hasNext())
??????????????? {
??????????????????? SelectionKey key = (SelectionKey)iter.next();

??????????????????? if(key.isAcceptable())
??????????????????? {
??????????????????????? ServerSocketChannel svrSocketChannel = (ServerSocketChannel)key.channel();
??????????????????????? SocketChannel clientChannel = null;
??????????????????????? try
??????????????????????? {
??????????????????????????? clientChannel = svrSocketChannel.accept();
??????????????????????? }
??????????????????????? catch(IOException e)
??????????????????????? {
??????????????????????????? // TODO Auto-generated catch block
??????????????????????????? if(clientChannel != null)
??????????????????????????? {

??????????????????????????????? clientChannel.close();
??????????????????????????? }
??????????????????????????? if(key != null)
??????????????????????????? {
??????????????????????????????? key.cancel();
??????????????????????????? }
??????????????????????? }

??????????????????????? send(clientChannel);

??????????????????? }
??????????????????? iter.remove();
??????????????????? log.info("************SEND? END*************");
??????????????? }
??????????? }
??????? }
??????? catch(IOException e)
??????? {
??????????? // TODO Auto-generated catch block
??????????? log.info("ServerSocketChannel總體迭代發生核心異常\r\n" + e.getMessage());
??????????? e.printStackTrace();
??????? }

??? }

??? /**
???? * 方法名稱：send <p>
???? * 方法功能：發送給客戶信息 <p>
???? * 參數說明：SocketChannel, String <p>
???? * 返回：void <p>
???? * 作者：李明 <p>
???? * 日期：2006年3月23日 <p>
???? *
???? * @param channel
???? * @param key
???? * @throws IOException
???? */
??? public void send(SocketChannel clientChannel)
??? {

??????? SocketChannel remoteSvrChannel = null;

??????? buffer.clear();
??????? int count;

??????? log.info("************SEND START*************");

??????? try
??????? {
??????????? while((count = clientChannel.read(buffer)) > 0)
??????????? {
??????????????? buffer.flip();

??????????????? byte[] bytebuffer = new byte[count];
??????????????? buffer.get(bytebuffer, 0, count);

??????????????? ByteBuffer bufferWrite = ByteBuffer.wrap(bytebuffer);

??????????????? byte[] b = new byte[bufferWrite.limit()];
??????????????? bufferWrite.get(b);
??????????????? String context = new String(b);

??????????????? // 打印客戶請求代理服務器信息
??????????????? log.info(context);

??????????????? // 解析客戶信息，得到遠程主機和端口。
??????????????? proxyUtil.setUrl(context);
??????????????? setRemoteHost(proxyUtil.getHost());
??????????????? setRemotePort(proxyUtil.getPort());

??????????????? log.info("Remote Host " + getRemoteHost());
??????????????? log.info("Remote Port " + getRemotePort());

??????????????? if(remoteSvrChannel == null)
??????????????? {
??????????????????? InetSocketAddress inet = new InetSocketAddress(getRemoteHost(), getRemotePort());
??????????????????? try
??????????????????? {
??????????????????????? remoteSvrChannel = SocketChannel.open(inet);
??????????????????????? // remoteSvrChannel.configureBlocking(false);
??????????????????????? // Socket remoteSvr = remoteSvrChannel.socket();
??????????????????????? // remoteSvr.setSoTimeout(1000);
??????????????????????? bufferWrite.flip();
??????????????????????? remoteSvrChannel.write(bufferWrite);
??????????????????????? buffer.clear();
??????????????????????? int n;
??????????????????????? while((n = remoteSvrChannel.read(buffer)) > 0)
??????????????????????? {
??????????????????????????? log.info("n=" + n);
??????????????????????????? buffer.flip();
??????????????????????????? log.info("buffer.limit=" + buffer.limit());
??????????????????????????? clientChannel.write(buffer);
??????????????????????? }
??????????????????? }
??????????????????? catch(java.nio.channels.UnresolvedAddressException ex)
??????????????????? {
??????????????????????? log.info("主機地址訪問無效\r\n" + ex.getMessage());
??????????????????? }
??????????????????? catch(IOException e)
??????????????????? {
??????????????????????? // TODO Auto-generated catch block
??????????????????????? try
??????????????????????? {
??????????????????????????? if(remoteSvrChannel != null)
??????????????????????????? {
??????????????????????????????? remoteSvrChannel.close();
??????????????????????????? }
??????????????????????? }
??????????????????????? catch(IOException e1)
??????????????????????? {
??????????????????????????? // TODO Auto-generated catch block
??????????????????????????? e1.printStackTrace();
??????????????????????? }
??????????????????? }
??????????????? }
??????????? }
??????? }
??????? catch(IOException e1)
??????? {
??????????? // TODO Auto-generated catch block
??????????? try
??????????? {
??????????????? if(clientChannel != null)
??????????????? {
??????????????????? clientChannel.close();
??????????????? }
??????????? }
??????????? catch(IOException e)
??????????? {
??????????????? // TODO Auto-generated catch block
??????????????? e.printStackTrace();
??????????? }
??????? }

??????? finally
??????? {
??????????? try
??????????? {
??????????????? if(remoteSvrChannel != null)
??????????????? {
??????????????????? remoteSvrChannel.close();
??????????????? }
??????????????? if(clientChannel != null)
??????????????? {
??????????????????? clientChannel.close();
??????????????? }
??????????? }
??????????? catch(IOException e)
??????????? {
??????????????? // TODO Auto-generated catch block
??????????????? e.printStackTrace();
??????????? }
??????? }

??????? // 打印遠程服務器返回給客戶端信息
//??????? buffer.flip();
//??????? byte[] b2 = new byte[buffer.limit()];
//??????? buffer.get(b2);
//??????? log.info(new String(b2));

??????? // 關閉遠程和客戶的連接

??? }

??? public static String getRemoteHost()
??? {
??????? return remoteHost;
??? }

??? public static void setRemoteHost(String remoteHost)
??? {
??????? ProxyServer.remoteHost = remoteHost;
??? }

??? public static int getRemotePort()
??? {
??????? return remotePort;
??? }

??? public static void setRemotePort(int remotePort)
??? {
??????? ProxyServer.remotePort = remotePort;
??? }

??? public ByteBuffer getBuffer()
??? {
??????? return buffer;
??? }

??? public void setBuffer(ByteBuffer buffer)
??? {
??????? this.buffer = buffer;
??? }

??? /**
???? * @param args
???? */
??? public static void main(String[] args)
??? {
??????? // TODO Auto-generated method stub
??????? ProxyServer p = new ProxyServer();
??????? p.runServer();
??? }
}