Socket的使用

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;

// main class TalkClient.class
public class TalkClient{
    public static void main(String args[]){
        try{
            //向127.0.0.1的4700端口发出请求
            Socket socket = new Socket("127.0.0.1", 4700);    //
            //由系统标准输入设备构造BufferedReader对象
            BufferedReader sin = new BufferedReader(new InputStreamReader(System.in));
            //由Socket对象得到输出流，并构造PrintWriter对象
            PrintWriter os= new PrintWriter(socket.getOutputStream());
            //由Socket对象得到输入流，并构造相应的BufferedReader对象
            BufferedReader is=new BufferedReader(new InputStreamReader(socket.getInputStream()));
            String readline;
            readline = sin.readLine();
            while(!readline.equals("bye")){
                os.println(readline);
                os.flush();
                System.out.println("Client:"+readline);
                System.out.println("Server:"+is.readLine());
                readline = sin.readLine();
            }
            os.close();
            is.close();
            socket.close();
        }catch(Exception e){
            System.out.println("Error"+e);
        }
    }
}

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 TalkServer{
  public static void main(String args[]) {
    try{
      ServerSocket server=null;
      try{
        server=new ServerSocket(4700);
        //创建一个ServerSocket在端口4700监听客户请求
      }catch(Exception e) {
         System.out.println("can not listen to:"+e);
     //出错，打印出错信息
      }
    Socket socket=null;
    try{
       socket=server.accept();
        //使用accept()阻塞等待客户请求，有客户
        //请求到来则产生一个Socket对象，并继续执行
    }catch(Exception e) {
        System.out.println("Error."+e);
    }

    String line;
    BufferedReader is=new BufferedReader(new InputStreamReader(socket.getInputStream()));
        //由Socket对象得到输入流，并构造相应的BufferedReader对象
        PrintWriter os=new PrintWriter(socket.getOutputStream());
    //由Socket对象得到输出流，并构造PrintWriter对象
    BufferedReader sin=new BufferedReader(new InputStreamReader(System.in));
    //由系统标准输入设备构造BufferedReader对象
    System.out.println("Client:"+is.readLine());
    //在标准输出上打印从客户端读入的字符串
    line=sin.readLine();
    //从标准输入读入一字符串
    while(!line.equals("bye")){
        os.println(line);
        //向客户端输出该字符串
        os.flush();
        System.out.println("Server:"+line);
        System.out.println("Client:"+is.readLine());
        line=sin.readLine();
    }//继续循环
    os.close(); //关闭Socket输出流
    is.close(); //关闭Socket输入流
    socket.close(); //关闭Socket
    server.close(); //关闭ServerSocket
    }catch(Exception e){
        System.out.println("Error:"+e);
    }
  }
}