2. 接下來是如何封裝發送請求的客戶端，這里用的netty，具體可以根據項目情況使用mina或者nio都可以。代碼直接明了^_^：
1 package tea.client.network;
2
3 import java.net.InetSocketAddress;
4 import java.util.concurrent.Executors;
5 import org.jboss.netty.bootstrap.ClientBootstrap;
6 import org.jboss.netty.channel.Channel;
7 import org.jboss.netty.channel.ChannelFuture;
8 import org.jboss.netty.channel.ChannelHandlerContext;
9 import org.jboss.netty.channel.ChannelPipeline;
10 import org.jboss.netty.channel.ChannelPipelineFactory;
11 import org.jboss.netty.channel.ChannelStateEvent;
12 import org.jboss.netty.channel.Channels;
13 import org.jboss.netty.channel.ExceptionEvent;
14 import org.jboss.netty.channel.MessageEvent;
15 import org.jboss.netty.channel.SimpleChannelHandler;
16 import org.jboss.netty.channel.socket.nio.NioClientSocketChannelFactory;
17 import tea.common.network.ClientDecoder;
18 import tea.common.network.ClientEncoder;
19 import tea.common.network.ClientMessage;
20
21 /**
22 * @author Teaey
23 * @creation 2012-8-25
24 */
25 public class BaseClient
26 {
27 public BaseClient(String ip， String port)
28 {
29 this.ip = ip;
30 this.port = port;
31 }
32 private String ip;
33 private String port;
34 private Channel channel;
35 private ClientBootstrap bootstrap;
36 private Object syn = new Object();
37 private static final int Receive_Timeout = 10000; //ms
38 private ClientMessage response = null;
39 public void connect()
40 {
41 bootstrap = new ClientBootstrap(new NioClientSocketChannelFactory(Executors.newCachedThreadPool()， Executors.newCachedThreadPool()));
42 bootstrap.setOption("tcpNoDelay"， true);
43 bootstrap.setPipelineFactory(new ClientPipelineFactory());
44 while (true)
45 {
46 ChannelFuture future = bootstrap.connect(new InetSocketAddress(ip， Integer.parseInt(port)));
47 future.awaitUninterruptibly(5000);
48 if (future.isDone())
49 {
50 channel = future.getChannel();
51 if (channel != null && channel.isConnected())
52 {
53 break;
54 }
55 }
56 }
57 }
58 public void disconnect()
59 {
60 if (channel.isConnected())
61 {
62 channel.disconnect();
63 }
64 }
65 public boolean isConnected()
66 {
67 return channel.isConnected();
68 }
69 public void close()
70 {
71 if (this.channel.isOpen())
72 {
73 this.channel.close();
74 }
75 bootstrap.releaseExternalResources();
76 }
77 /**
78 * 發送消息，無需返回
79 */
80 public void send(ClientMessage message)
81 {
82 channel.write(message);
83 }
84 /**
85 * 發送消息，等待返回
86 */
87 public ClientMessage sendWaitBack(ClientMessage message)
88 {
89 response = null;
90 try
91 {
92 channel.write(message);
93 synchronized (syn)
94 {
95 try
96 {
97 syn.wait(Receive_Timeout);
98 } catch (InterruptedException e)
99 {
100 e.printStackTrace();
101 }
102 }
103 if (null == response)
104 {
105 System.err.println("Receive response timeout");
106 }
107 } catch (Exception e)
108 {
109 e.printStackTrace();
110 }
111 return response;
112 }
113 class ClientPipelineFactory implements ChannelPipelineFactory
114 {
115 public ChannelPipeline getPipeline() throws Exception
116 {
117 ChannelPipeline p = Channels.pipeline();
118 p.addLast("frameDecoder"， new ClientDecoder());
119 p.addLast("fremeEncoder"， new ClientEncoder());
120 p.addLast("logicHandler"， new ClientMsgHandler());
121 return p;
122 }
123 }
124 class ClientMsgHandler extends SimpleChannelHandler
125 {
126 public void messageReceived(ChannelHandlerContext ctx， MessageEvent e) throws Exception
127 {
128 Object obj = e.getMessage();
129 if (obj instanceof ClientMessage)
130 {
131 ClientMessage msg = (ClientMessage) obj;
132 response = msg;
133 synchronized (syn)
134 {
135 syn.notifyAll();
136 }
137 }
138 }
139 public void channelConnected(ChannelHandlerContext ctx， ChannelStateEvent e) throws Exception
140 {
141 System.out.println("connected server:" + ctx.getChannel());
142 }
143 public void channelDisconnected(ChannelHandlerContext ctx， ChannelStateEvent e) throws Exception
144 {
145 System.out.println("disconnected server:" + ctx.getChannel());
146 }
147 public void exceptionCaught(ChannelHandlerContext ctx， ExceptionEvent e) throws Exception
148 {
149 System.out.println("Error in exceptionCaught:" + e.getCause());
150 }
151 }
152 }
這段代碼展示了我們的客戶端，這里所有的請求有兩種發送模式，一種是發送并阻塞等待返回（sendWaitBack），第二種是直接發送（send）。
