SEVER:
package com.imooc;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
/*
 * 基于TCP的Socket的通信
 * 服务器端
 */
public class Sever {
 public static void main(String[] args) {
  // TODO Auto-generated method stub
  try {
   ServerSocket serversocket=new ServerSocket(8888);
   System.out.println("***服务器即将启动，等待客户端的连接***");
   Socket socket=serversocket.accept();//监听客户端请求
   InputStream is=socket.getInputStream();//字节流
   InputStreamReader isr=new InputStreamReader(is);//将字节流转换为字符流
   BufferedReader br=new BufferedReader(isr);//为输入流添加缓冲
   String info=null;
      while((info=br.readLine())!=null){//循环读取客户端的信息
       System.out.println("我是服务器，客户端说："+info);
      }
      socket.shutdownInput();//关闭输入流
      
      OutputStream os=socket.getOutputStream();
      PrintWriter pw=new PrintWriter(os);
      pw.write("欢迎您！");
      pw.flush();  
      socket.shutdownOutput();
       
      
      is.close();
      isr.close();
      br.close();
      os.close();
      pw.close();    
      serversocket.close();
      socket.close();
      
   
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
 }
}

client:

package com.imooc;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;
/*
 * 基于TCP的Socket的通信
 * 客户端
 */
public class Client {
 public static void main(String[] args) {
  // TODO Auto-generated method stub
  try {
   InetAddress address=InetAddress.getLocalHost();
   Socket socket=new Socket(address.getHostAddress(),8888);
   OutputStream os=socket.getOutputStream();//输出流
   PrintWriter pw=new PrintWriter(os);//将输出流转换为打印流
   pw.write("用户名：可心;密码是：1234");
      pw.flush();
   socket.shutdownOutput();//关闭输出流
   
   InputStream is=socket.getInputStream();
   InputStreamReader isr=new InputStreamReader(is);//将字节流转换为字符流
   BufferedReader br=new BufferedReader(isr);//为输入流添加缓冲
   String info=null;
      while((info=br.readLine())!=null){//循环读取客户端的信息
       System.out.println("我是客户端，服务器说："+info);
      }
   socket.shutdownInput();
   
   
   os.close();
   pw.close();
   is.close();
   isr.close();
   br.close();   
   socket.close();
   
  } catch (UnknownHostException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
  
 }
}

 运行结果