学步园

最近在学习分布式，分布式的前提是要知道网络服务器的通信，自己对这一块基本不了解，最近学习了一下，整理一个demo，方便以后查阅

这个是关于TCP/BIO，所谓BIO就是阻塞IO，没收到消息时就处于阻塞状态，有消息就工作，我用了多线程来处理收消息和发消息，实现了异步发送

 

服务器端代码：

package internetCommunication;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

public class Server {

    public static void main(String[] args) {
        try {
            ServerSocket server = new ServerSocket(8888);
            Socket client = server.accept();
            BufferedReader in = new BufferedReader(new InputStreamReader(client.getInputStream()));
            PrintWriter out=new PrintWriter(client.getOutputStream());
            BufferedReader userin = new BufferedReader(new InputStreamReader(System.in));
            
            
            new ReceiveTread(server,in,out,userin,client).start();
            new SendThread(out, userin,true).start();
        } catch (IOException e) {
            e.printStackTrace();
        }
        
        
    }

}

客户端代码

package internetCommunication;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.Socket;

public class Client {
    
    
    public static void main(String[] args) {
        try {
            Socket server = new Socket(InetAddress.getLocalHost(), 8888);
            BufferedReader in = new BufferedReader(new InputStreamReader(server.getInputStream()));
            PrintWriter out=new PrintWriter(server.getOutputStream());
            BufferedReader userin = new BufferedReader(new InputStreamReader(System.in));
            
            new SendThread(out,userin,false).start();
            new ReceiveTread(server,in,out,userin).start();
            
            
        } catch (IOException e) {
            e.printStackTrace();
        }
        
        
    }
}

 

发消息多线程类

package internetCommunication;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.text.SimpleDateFormat;
import java.util.Date;

public class SendThread extends Thread{

    PrintWriter out;
    BufferedReader userin;
    boolean isServer;
    
    public SendThread(PrintWriter out,BufferedReader userin,boolean isServer) {
        this.out = out;
        this.userin = userin;
        this.isServer = isServer;
    }

    @Override
    public void run() {
        SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        
        try {
            while(true){
                if(isServer){
                    out.println("Server  "+sf.format(new Date())+"\n\t"+ userin.readLine());
                }else{
                    out.println("client  "+sf.format(new Date())+"\n\t"+ userin.readLine());
                }
                out.flush();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        
    }
    
    
    
    
    
    
}

 

接消息多线程类

package internetCommunication;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

public class ReceiveTread extends Thread{
    BufferedReader in ;
    ServerSocket server;
    PrintWriter out;
    BufferedReader userin;
    Socket client;
    
    
    public ReceiveTread(ServerSocket server,BufferedReader in,PrintWriter out,BufferedReader userin,Socket client) {
        this.in = in;
        this.server = server;
        this.client = client;
        this.out = out;
        this.userin = userin;
    }
    
    public ReceiveTread(Socket client ,BufferedReader in,PrintWriter out,BufferedReader userin) {
        this.in = in;
        this.client = client;
        this.out = out;
        this.userin = userin;
    }
    
    
    @Override
    public void run() {
        try {
            while(true){
                String info = in.readLine();
                while(info !=null){
                    System.out.println(info);
                    info = in.readLine();
                }
                if(in.readLine().equals("end")){
                    break;
                }
            }
            in.close();
            out.close();
            userin.close();
            if(client != null){
                client.close();
            }
            server.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

 

以下是控制输出：

这是客户端的

 

 

这是服务器的：

 

这里要注意的是： 1、启动时要先启动服务器，在启动客户端，因为只有服务器启动了，开始监听某个端口，客户端才能连上

                       2、因为输入控制台和输出控制台都揉在一起显示，控制台显示接收消息的时候，光标还是会停留在上一次输入的地方，如果输入非汉字类的，光标会自动跳下来

但是输入汉字，会出现把接收到消息也发送的情况，所以需要输入的时候将光标自己点下来，如果是GUI编程的话，就没有这个问题，因为输入的面板和显示面板是独立开来的，呵呵