socket编程 java实现

参考:https://blog.csdn.net/lucas_up/article/details/79751443

https://www.cnblogs.com/wangcq/p/3520400.html

socket编程 java实现_第1张图片

 先从服务器端说起。服务器端先初始化Socket,然后与端口绑定(bind),对端口进行监听(listen),调用accept阻塞,等待客户端连接。在这时如果有个客户端初始化一个Socket,然后连接服务器(connect),如果连接成功,这时客户端与服务器端的连接就建立了。客户端发送数据请求,服务器端接收请求并处理请求,然后把回应数据发送给客户端,客户端读取数据,最后关闭连接,一次交互结束。

获取主机信息

package SYA;
import java.net.*;
public class Host 
{
	public InetAddress ipa;
	public Host()
	{
		try
		{
			ipa=InetAddress.getByName(null);//获取本机的地址
			//System.out.println("Host Name:"+ipa.getHostName());
			//System.out.println("Host IP:"+ipa.toString());
			//System.out.println("Local Host Name:"+ipa.getLocalHost());
		}
		catch(UnknownHostException e)
		{
			System.out.println(e.toString());
		}
	}

}

客户端程序

package SYA;

import java.io.*;

import java.net.*;


public class Client 
{
	public static void main(String[] args)
	{
		System.out.println("我是客户端");
		String str;
		try
		{
			Host h=new Host();
			Socket socket=new Socket(h.ipa,8000);
			System.out.println("Socket:"+socket);
			InputStream fin=socket.getInputStream();
			OutputStream fout=socket.getOutputStream();
			//建立数据流
			InputStreamReader in=new InputStreamReader(fin);
			BufferedReader jin=new BufferedReader(in);
			PrintStream out=new PrintStream(fout);
			InputStreamReader in_out=new InputStreamReader(System.in);
			BufferedReader jout=new BufferedReader(in_out);
			while(true)
			{
				System.out.println("发送字符串");
				str=jout.readLine();
				out.println(str);
				if(str.equals("end"))break;
				System.out.println("等待服务器消息");
				str=jin.readLine();
				System.out.println("服务器消息:"+str);
				if(str.equals("end"))break;
			}
		}
		catch(Exception e)
		{
			
		}
		
	} 
	 public void fun ()
	 {
		  try {
			  Socket s= new Socket("localhost",7522);
			  OutputStream os= (OutputStream) s.getOutputStream();
			  OutputStreamWriter osw=new OutputStreamWriter(os);
			  PrintWriter pw= new PrintWriter(osw,true);
			  pw.println("你好");
			  InputStream is = s.getInputStream();
			  InputStreamReader isw	= new InputStreamReader (is);
			 BufferedReader br= new BufferedReader(isw);
			 
			 String mess= br.readLine();
			 System.out.println(mess);
		  }catch( Exception e ){
			  
		  }
	  }
}

服务器端程序

package SYA;
import java.net.*;
import java.io.*;

public class Server 
{
	public static final int port=8000;
	public static void main(String[] args)
	{
		String str;
		System.out.println("我是服务端");
		try
		{
			 ServerSocket server=new ServerSocket(port);//创建线程监听对象
			 System.out.println("started:"+server);
			 Socket socket=server.accept();//负责C/S通信的socket对象
			 System.out.println("Socket:"+socket);
			 //socket的输入输出流
			 InputStream fin=socket.getInputStream();
			 OutputStream fout=socket.getOutputStream();
			 //C/S数据流
			 InputStreamReader in=new InputStreamReader(fin);
			 BufferedReader jin=new BufferedReader(in);
			 //S/C输出
			 PrintStream out= new PrintStream(fout);
			 InputStreamReader in_out=new InputStreamReader(System.in);
			 BufferedReader jout=new BufferedReader(in_out);
			 while(true)
			 {
				 System.out.println("等待客户端消息");
				 str=jin.readLine();
				 System.out.println("客户端输入:"+str);
				 if(str.equals("end")){break;}
				 System.out.print("服务端发送:");
				 str=jout.readLine();
				 out.println(str);//向客户端发送
				 if(str.equals("end")){break;}
			 }
			 socket.close();
		}
		catch(Exception e)
		{
			System.out.println("异常");
		}
		
	}
	public void fun()
	{
		try{
			ServerSocket ss=new ServerSocket (7522);//7522是端口号,我们设计端口号要避开8080,1433,1521,3306这几个端口
			System.out.println("监听前");
			Socket s=ss.accept();//服务器端运行到这会停下,等待客户端
			/*System.out.println(s.getInputStream().read());*/
			InputStream is= s.getInputStream();
			InputStreamReader isr=new InputStreamReader(is);
			BufferedReader br=new BufferedReader (isr);//字节流转换成字符流
			String name=br.readLine();
			System.out.println(name);
			OutputStream os=  s.getOutputStream();
			OutputStreamWriter osw=new OutputStreamWriter(os);
			PrintWriter pw=new PrintWriter(osw,true);
			pw.println("welcom"+name);
			
		}catch (Exception e){
			
		}
	}
	

}

运行结果:

socket编程 java实现_第2张图片 socket编程 java实现_第3张图片

 

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