socket通信程序中的有关问题

socket通信程序中的问题
下面是两段程序，服务器端的和客户端的，现在的问题是：
当服务器端给客户端发数据之后，客户端好像接受不到，如果把//code   for   test之间的代码去掉，就可以实现客户端到服务器端的数据传送，难道逆向就不能了吗？


服务器段程序：
import   java.io.*;
import   java.net.*;

public   class   tcpServer   {
public   static   void   main(String[]   args)
{
int   port=1500;
ServerSocket   server_socket;
BufferedReader   input;
//code   for   test
BufferedReader   input1;
PrintWriter   output;
String   lineToSend;
//code   for   test
try
{
server_socket=new   ServerSocket(port);
System.out.println( "server   listening   on   port: "+server_socket.getLocalPort());

while(true)
{
Socket   socket=server_socket.accept();
System.out.println( "New   connection   at   "+socket.getInetAddress()+ ": "+socket.getPort());
input=new   BufferedReader(new   InputStreamReader(socket.getInputStream()));
//code   for   test
input1=new   BufferedReader(new   InputStreamReader(System.in));
output=new   PrintWriter(socket.getOutputStream());
//code   for   test
try
{
while(true)
{

//code   for   test
lineToSend=input1.readLine();
System.out.println(lineToSend);
if(lineToSend.equals( "end "))
{
System.out.println( "game   over ");
break;
}
System.out.println( "begin ");
output.println(lineToSend);
System.out.println( "end ");
//code   for   test

String   message=input.readLine();

if(message==null)
{
System.out.println( "message   equals   null ");
break;
}

System.out.println(message);

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

try
{
socket.close();
System.out.println( "socket   closed   by   client ");
}
catch(IOException   e)
{
System.out.println(e);
}
}
}
catch(IOException   e)
{
System.out.println(e);
}
}
}

客户端程序：
import   java.io.*;
import   java.net.*;

public   class   tcpClient  
{
public   static   void   main(String[]   args)
{
int   port=1500;
String   server= "localhost ";
Socket   socket=null;
String   lineToSend;
BufferedReader   input;
PrintWriter   output;
int   ERROR=1;
//code   for   test
BufferedReader   input1;
//code   for   test

//connect   to   the   server
try
{
socket=new   Socket(server,port);
System.out.println( "connected   with   server   "+socket.getInetAddress()+ ": "+socket.getPort());
}
catch(UnknownHostException   e)
{
System.out.println(e);
System.exit(ERROR);
}
catch(IOException   e)
{
System.out.println(e);
System.exit(ERROR);
}

try
{