我是一个java新手，近来学习socket时遇到了些问题，请各位多多指教
以下两个文件一个是server,一个是client.运行时client不能收到server的信息，
但server可以收到client的信息。

//testClient.java

import java.io.*;
import java.net.*;

public class testClient
{
final static int CONN_PORT = 8089;
public static void main(String args[]) throws UnknownHostException, IOException
{

InetAddress host;
String serverResponse;
DataInputStream    inn;
DataOutputStream   outt;
BufferedReader in;
PrintWriter    out;
String welcome;

Socket clientSocket;


host = InetAddress.getByName("localhost");
clientSocket = new Socket(host, CONN_PORT);

while(true)
{ try
{
if(clientSocket == null)
{
System.exit(10);
}

inn = new DataInputStream(clientSocket.getInputStream());
outt = new DataOutputStream(clientSocket.getOutputStream());

in =new BufferedReader (new InputStreamReader(inn));
out = new PrintWriter (new OutputStreamWriter(outt),true);



System.out.println("cliet is ready");
welcome = in.readLine();
System.out.println("Server reply: " + welcome);
out.println("hello");
System.out.println("Client write: Hello");
}

catch(Exception e)
{
System.out.println(e);
}
}
}
}

//testServer.java

import java.util.*;
import java.io.*;
import java.net.*;

public class testServer
{
final static int SERVER_PORT = 8089;
public static void main(String args[])
{
String clientRequest;
Server server;
BufferedReader in;
PrintWriter    out;

server = new Server(SERVER_PORT);

if (server == null)
{
System.exit(10);
}
in = new BufferedReader(new InputStreamReader(server.in));
out =new PrintWriter(new OutputStreamWriter(server.out));
out.println("Java test ServerSocket: " + new Date());

while(true)
{
try
{
clientRequest = in.readLine();
System.out.println("Client writes: " + clientRequest);
}

catch(Exception e)
{
System.out.println(e);
}
}
}

}


class Server
{
private ServerSocket server;
private Socket       socket1;
public InputStream  in;
public OutputStream out;

public Server(int port)
{
try
{
server = new ServerSocket(port);
System.out.println("ServerSocket before accept: " + server);
System.out.println("Java test ServerSocket ver0.1 online!");

//wait for client to connect to server
socket1 = server.accept();
System.out.println("ServerSocket after accept: " + server);

in = socket1.getInputStream();
out = socket1.getOutputStream();
}

catch(Exception e)
{
System.out.println(e);
}

}
}

Here is the souce code I write for a time server using socket. Hope it will help you.

// The server:
import java.net.*;
import java.io.*;
import java.util.Date;

/**
 * A class send out date infomation through socket.
 *
 * @author: java8964
 * @version: 1
 */
public class DaytimeServer {
    public static final int PORT = 1300;

    public static void main(String[] args) {
        try {
            ServerSocket server = new ServerSocket(PORT);
            Socket connection = null;

            while (true) { // using a while (true) loop
                try {
                    connection = server.accept();
                    OutputStreamWriter out = new OutputStreamWriter(connection.getOutputStream());
                    Date now = new Date();
                    out.write(now.toString() + "rn");
                    out.flush();
                    connection.close();
                } catch (IOException ioe) {
                    System.err.println(ioe);
                } finally {
                    try {
                        if (connection != null)
                            connection.close();
                    } catch (IOException e) {}
                }
            }
        } catch (IOException ee) {
            System.err.println(ee);
        }
    } // end main
} // end DaytimeServer

// The client
import java.net.*;
import java.io.*;

/**
 * A class to receive time infomation from server through socket.
 *
 * @author: java8964
 * @version: 1
 */
public class DaytimeClient {
    /**
     * The port which client and server make connection.
     */
    public static final int PORT = 1300;

    public static void main(String[] args) {
        String hostName;
        if (args.length > 0) {
            hostName = args[0];
        } else {
            hostName = "localhost";
        }

        try {
            Socket clientSocket = new Socket(hostName, PORT);
            InputStream timeStream = clientSocket.getInputStream();
            StringBuffer time = new StringBuffer();
            int c;
            while ((c = timeStream.read()) != -1) {
                time.append((char)c);
            }
            String timeString = time.toString().trim();
            System.out.println("It is " + timeString + " at " + hostName);
        } catch (UnknownHostException ukhe) {
            System.err.println(ukhe);
        } catch (IOException ioe) {
            System.err.println(ioe);
        }
    } // end main
} // end DaytimeClient