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如下的GreetingServer 程序是一个服务器端应用程序，使用Socket来监听一个指定的端口。
// 文件名
import .*;
import .*;
public class GreetingServer extends Thread
{
private ServerSocket serverSocket;
public GreetingServer(int port) throws IOException
{
serverSocket = new ServerSocket(port);
oTimeout(10000);
}
public void run()
{
while(true)
{
try
{
tln("Waiting for client on port " +
ocalPort() + "...");
Socket server = pt();
tln("Just connected to "
+ emoteSocketAddress());
DataInputStream in =
new DataInputStream(nputStream());
tln(UTF());
DataOutputStream out =
new DataOutputStream(utputStream());
eUTF("Thank you for connecting to "
+ ocalSocketAddress() + "nGoodbye!");
e();
}catch(SocketTimeoutException s)
{
tln("Socket timed out!");
break;
}catch(IOException e)
{
tStackTrace();
break;
}
}
}
public static void main(String [] args)
{
int port = eInt(args[0]);
try
{
Thread t = new GreetingServer(port);
t();
}catch(IOException e)
{
tStackTrace();
}
}
}
编译以上 java 代码，并执行以下命令来启动服务，使用端口号为 6066：
$ java GreetingServer 6066
Waiting for client on port 6066...
像下面一样开启客户端：
$ java GreetingClient localhost 6066
Connecting to localhost on port 6066
Just connected to localhost/
Server says Thank you for connecting to /
Goodbye!
