以下是我测试用的客户端，与你的服务器端程序一起运行正常，你的客户端有问题吗？还有就是你的网络的问题了。
import java.net.*;
import java.io.*;
public class TestSocketClient{
public static void main(String[] args)
{
String serviceHost = "10.34.52.51";
int servicePort = 7777;
java.net.Socket socket=null;
BufferedReader reader=null;
PrintWriter out=null;
try
{
socket = new java.net.Socket(serviceHost,servicePort);
System.out.println("client socket: " + socket);
reader = new BufferedReader (new InputStreamReader(System.in));
out=new PrintWriter(socket.getOutputStream());
String str="";
do{
str=reader.readLine();
System.out.println("out:"+str);
out.println(str);
}while(!str.equals("."));
}
catch (IOException ex)
{
ex.printStackTrace();
}
catch(Exception ex)
{
ex.printStackTrace();
}
finally
{
try
{
reader.close();
out.close();
socket.close();
}
catch (IOException ex)
{
ex.printStackTrace();
}
}
}
}
