Client 源码：

import *;
import *;

public class ClientSocket {
    public static void main(String [] args) throws Exception{
        Socket accs=new Socket("127.0.0.1",8700);
         BufferedReader mbr=new BufferedReader(new InputStreamReader(System.in));
         PrintWriter tpw=new PrintWriter(accs.getOutputStream());  
          BufferedReader fmbrs=new BufferedReader(new InputStreamReader(accs.getInputStream()));
          String strMessage = mbr.readLine();
         while(!strMessage.equals("exit")){
             tpw.print(strMessage);
             tpw.flush();
             System.out.println("Send to server: "+ strMessage);
             System.out.println("Serve say : "+ fmbrs.readLine());
             strMessage = mbr.readLine();
           }
            tpw.close();
            fmbrs.close();
            accs.close();
        }
    }

Server端源码：

import *;
import *;

public class HostSocket {
    public static void main(String [] args) throws Exception{
       ServerSocket mss=new  ServerSocket(8700);
       Socket accs= mss.accept();
        String strInMessage;
       BufferedReader mbrc=new BufferedReader(new InputStreamReader(accs.getInputStream()));
       PrintWriter mpw=new PrintWriter(accs.getOutputStream());
       BufferedReader mbr=new BufferedReader(new InputStreamReader(System.in));
         System.out.println("Client Say: "+mbrc.readLine());
         strInMessage=mbr.readLine();
         while(!strInMessage.equals("exit")){
         mpw.print(strInMessage);
         mpw.flush();
         System.out.println("Send to Client Message: "+strInMessage);
        System.out.println("Client say "+mbrc.readLine());
        strInMessage=mbr.readLine();
         }
         mpw.close();
         mbrc.close();
         accs.close();
         mss.close();
   }
   
}

目测没有发现问题....你自己断点好好调调吧

在BufferedReader.readLine()方法下，阻塞了找不到原因，能帮我调试下找下原因吗？

readLine() 方法阻塞，你的循环是跑不起来的
我也是新手，目前的认知水平，感觉不用线程，你这个实现好像不可能实现
如果说的不对，请大侠们指正

import *;

 import *;

 public class ClientSocket {
     public static void main(String [] args) throws Exception{
         Socket accs=new Socket("127.0.0.1",8700);
          BufferedReader mbr=new BufferedReader(new InputStreamReader(System.in));
          PrintWriter tpw=new PrintWriter(accs.getOutputStream());
           BufferedReader fmbrs=new BufferedReader(new InputStreamReader(accs.getInputStream()));
           String strMessage = mbr.readLine();
          while(!strMessage.equals("exit")){
              tpw.print(strMessage+"\n");     //这里 修改一下  发送到服务端时加上"\n" 
              tpw.flush();
              System.out.println("Send to server: "+ strMessage);      
              System.out.println("Serve say : "+ fmbrs.readLine());              
              strMessage = mbr.readLine();
            }
             tpw.close();
             fmbrs.close();
             accs.close();
         }
     }
//----------------------

import *;
import *;

 public class HostSocket {
     public static void main(String [] args) throws Exception{
        ServerSocket mss=new  ServerSocket(8700);
        Socket accs= mss.accept();
         String strInMessage;
        BufferedReader mbrc=new BufferedReader(new InputStreamReader(accs.getInputStream()));
        PrintWriter mpw=new PrintWriter(accs.getOutputStream());
        BufferedReader mbr=new BufferedReader(new InputStreamReader(System.in));
          System.out.println("Client Say: "+mbrc.readLine());
          strInMessage=mbr.readLine();
          while(!strInMessage.equals("exit")){
          mpw.print(strInMessage+"\n");           //这里 修改一下  发送到客户端时加上"\n"          
          mpw.flush();
          System.out.println("Send to Client Message: "+strInMessage);   
         System.out.println("Client say "+mbrc.readLine());        
         strInMessage=mbr.readLine();
          }
          mpw.close();
          mbrc.close();
          accs.close();
          mss.close();
    }
   

 } 

你使用readLine 方法时要注意 ,  readLine 是阻塞性方法 ,  在读取到内容之前程序会一直停在这里,  并且是以读到"\n" 结束,   你程序在system in 里读到内容了 并发送到服务端,   readLine 也读取到发送过来的内容了  但是就差 "\n" 才能结束往下执行 ,

[ 本帖最后由 灵想 于 2013-10-30 19:47 编辑 ]

你最初这样写的程序...就一边一下依次交互来的就好了..当能灵活运行线程的时候  再把程序改成线程下可以随时交互