JAVAネットワークプログラミング初歩

import java.net.Socket;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
import java.net.UnknownHostException;

public class ClientText {

      public static final String ip="127.0.32.42";
      public static int port=7890;
      private Socket client_s;

      public ClientText(){
        try{
          client_s=new Socket(ip,port);
        }catch(UnknownHostException e){
          e.printStackTrace();
        }catch(IOException c){
          c.printStackTrace();
        }
      }

      public void setConnection() throws IOException{
        InputStream is;
        OutputStream os;
        try{
          is=client_s.getInputStream();
          os=client_s.getOutputStream();
          BufferedReader sys_br=new BufferedReader(new InputStreamReader(System.in));
          BufferedReader client_br=new BufferedReader(new InputStreamReader(is)); 
          PrintWriter client_pw=new PrintWriter(os,true);
           String warnStr=null;
          if((warnStr=client_br.readLine())!=null){
            System.out.println(warnStr);
          }
          while((warnStr=sys_br.readLine())!=null){
            client_pw.println(warnStr);
            break;
            }
        }catch(IOException e){
              e.printStackTrace();
        }
      }

    public static void main(String[] args) {
        // TODO          
         ClientText myclient=new ClientText();
            try {
                myclient.setConnection();
            } catch (IOException e) {
                // TODO       catch  
                e.printStackTrace();
            }
    }

}

import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.io.BufferedReader;

public class ServerText{

  private ServerSocket ss; 
  public static final int port=7890;

  public ServerText(){
    try{
      ss=new ServerSocket(port);
    }catch(IOException e){
      e.printStackTrace();
    }
  }

  public void setConnection()throws IOException{
    Socket server_s;
    OutputStream os;
    InputStream is;
    try{
      //           ，          
      server_s=ss.accept();
      //       
      os=server_s.getOutputStream();
      is=server_s.getInputStream();
      //        
      PrintWriter server_pw=new PrintWriter(os,true);
      //        
      BufferedReader server_br=new BufferedReader(new InputStreamReader(is));
      String msg=null;
      server_pw.println("    ,             ");
      if((msg=server_br.readLine())!=null){
        System.out.println("           ："+msg);
        server_pw.println("      ");
      }else{
        server_pw.println("      ，    ");
      }
    }catch(IOException e){
      e.printStackTrace();
    } 
  }

  public static void main(String args[]) throws IOException{
         ServerText server_text=new ServerText();
         server_text.setConnection();

      }  
}