简单的Java C/S模式

简单的Java C/S模式

(TCP协议下C/S模式)

TCP通信原理流程

客户端：

a、用服务器的IP地址和端口号实例化Socket对象；

b、调用connect方法，连接到服务器上；

c、将发送到服务器的I/O流填充到I/O对象里，比如BufferedReader/PrintWriter；

d、利用Socket提供的getInputStream和getOutputStream方法，通过I/O流对象，向服务器发送数据流；

e、通信完成后，关闭打开的I/O对象和Socket。

服务器：

a、  用一个端口实例化一个ServerSocket对象

b、  调用ServerSocket的accept（public Socket accept()）方法，开始监听连接从端口上发来的连接请求；

c、  利用accept方法返回的客户端的Socket对象，进行读写I/O的操作；

d、  通信完成后，关闭打开的流和Socket对象。

eg：(先运行服务器端，再运行客户端)

客户端：

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.InetAddress;

import java.net.Socket;

 

 

public class ClientCode {

 

       static String clientName = "Mike";

       //端口号

       public static int portNo = 3333;

       /**

        * @param args

        * @throws UnknownHostException

        */

       public static void main(String[] args) throws IOException {

              //设置连接地址类，连接本地

              InetAddress addr = InetAddress.getByName("localhost");

              //要对应服务器端的3333端口号

              Socket socket = new Socket(addr, portNo);

              try {

                     System.out.println("socket= "+socket);

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

                     PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())),true);

                     out.println("Hello Server,I am "+clientName);

                     String str = in.readLine();

                     System.out.println(str+"yuy");

                     out.println("byebye");

              }finally{

                     System.out.println("close the Client socket and the io.");

                     socket.close();

              }

 

       }

 

}

 

 

服务器端

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 ServerCode {

 

       /**

        * @param args

        */

       //设置端口号

       public static int portNo = 3333;

       public static void main(String[] args) throws IOException {

              //根据端口号，初始化ServerSocket类

              ServerSocket s = new ServerSocket(portNo);

              System.out.println("The Server is start:"+s);

              //阻塞，直到有客户端连接（监听从客户端的连接请求）

              Socket socket = s.accept();

              try {

                     System.out.println("Accept the Client:"+socket);

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

                     PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())),true);

                     while(true){

                            String str = in.readLine();

                            //如果接受到byebye字符串，退出循环

                            if(str.equals("byebye"))

                                   break;

                            System.out.println("In Server reveived the info: "+str);

                            out.println(str);

                     }

              } finally{

                     System.out.println("close the Server socket and the io.");

                     //关闭socket

                     socket.close();

                     s.close();

              }

 

       }

 

}