服务端：

package com.batch.service.impl;

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.OutputStreamWriter;

import java.io.PrintWriter;

import java.net.ServerSocket;

import java.net.Socket;

public class serverSoecktMain {

    public static void main(String[] args) {

           ServerSocket server = null;

           Socket socket = null;

           BufferedReader br = null;

           PrintWriter pr =null;

          try {

               try {

                server = new ServerSocket(6666);

               } catch (Exception e) {

                System.out.println("can not listen to:" + e);

               }

               System.out.println("server------------------------------");

               try {

                socket = server.accept();

               } catch (Exception e) {

                System.out.println("Error." + e);

               }

               br= new BufferedReader(new InputStreamReader(socket.getInputStream()));

               pr= new PrintWriter(socket.getOutputStream());

               pr.println("服务端：this is a server");

               pr.flush();

               System.out.println("Client:" + br.readLine());

              } catch (Exception e) {

               System.out.println("Error:" + e);

              } finally{

                  try {

                    server.close();

                    socket.close();

                    br.close();

                    pr.close();

                } catch (IOException e) {

                    // TODO Auto-generated catch block

                    e.printStackTrace();

                }

              }

    }

}

客户端：

package com.batch.service.impl;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.PrintWriter;

import java.net.ServerSocket;

import java.net.Socket;

import java.net.UnknownHostException;

public class serverMain {

    public static void main(String[] args) {

        Socket socket= null;

        PrintWriter pr= null;

        BufferedReader br = null;

        try {

               socket = new Socket("127.0.0.1",6666);

               pr = new PrintWriter(socket.getOutputStream());

               br = new BufferedReader(new InputStreamReader(socket.getInputStream()));

               System.out.println("Client------------------------------");

               pr.println("client is good!");

               pr.flush();

               System.out.println("Server:" + br.readLine());

              } catch (Exception e) {

               System.out.println("Error" + e); //错则打印错信息

              } finally{

                  try {

                    socket.close();

                    pr.close();

                    br.close();

                } catch (IOException e) {

                    // TODO Auto-generated catch block

                    e.printStackTrace();

                }

              }

    }

}