我是蒙古人--网络编程

1，java的服务器通过serverSocket建立TCP服务器，利用  Socket  建立TCP 客户端。

2，cmd 调出 dos 命令窗口 ，输入ipconfig /all 来查看机器上所有ip 地址

3，创建（服务器）和（客户端）的代码如下：

package cn.day1;
/*
*服务器
*
*/
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class Server{
	public static void main(String[] args) throws IOException {
		 //创建监听socked
		 ServerSocket server=new ServerSocket(50000);
		 System.out.println("服务端");
		 //创建通讯socket
		 Socket socket = server.accept();
	         //用输入流接收客户端请求
                 getInputStream stream= socket.getInputStream();
		 int date;
                 byte[] by=new byte[1024];
                 while((date=stream.read(by))!=-1){
                           String temp=new String(by,0,date);
                           System.out.println(temp);
                 }
                 stream.close();
	}

}

package cn.day1;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
import java.net.UnknownHostException;
/*
 * 客户端
 */
public class sock {

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

		Socket so=new Socket("192.168.15.117",50000);
		//用输出流输出客户端请求
		OutputStream stream = so.getOutputStream();
		String name="娜娜";
		stream.write(name.getBytes());
		stream.close();
	}

}

4，要想多个客户端给一个服务器发信息，那么我们用到(线程)以及(死循环)。

代码如下：

package cn.day1;
/*
 * 建立线程
 */
import java.io.IOException;
import java.io.InputStream;
import java.net.Socket;

public class Tread extends Thread{
	Socket socket=null;

	@Override
	public void run() {
		while(true){
			InputStream stream = null;
			try {
				stream = socket.getInputStream();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			byte[] bytes=new byte[1024];
			int dex;
			try {
				while((dex=stream.read(bytes))!=-1){
					//数据在二进制数组里头，转换成字符串类型
					String temp=new String(bytes,0,dex);
					System.out.println(temp);
}
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}

	}
	}
}

package cn.day1;
/*
 * 使用无限循环接收 多个客户端 请求
 */
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class X {
	public static void main(String[] args) throws IOException {
		//z创建监听socked
		ServerSocket server=new ServerSocket(50000);
		System.out.println("服务端");
		//创建通讯socket
		while(true){
		Socket socket = server.accept();
		Tread t1=new Tread();
		t1.socket=socket;
		t1.start();
		}

	}
}

　5，服务器接收客户端请求以后反馈给客户端的代码如下：

package cn.day1;

	/*
	*服务器
	*
	*/
	import java.io.IOException;
	import java.io.InputStream;
	import java.io.OutputStream;
	import java.net.ServerSocket;
	import java.net.Socket;
	public class Server {

		public static void main(String[] args) throws IOException {
			 //创建监听socked
			 ServerSocket server=new ServerSocket(50000);
			 System.out.println("服务端");
			 //创建通讯socket
			 Socket socket = server.accept();

		         //用输入流接收客户端请求
	         InputStream stream= socket.getInputStream();
			 int date;
	         byte[] by=new byte[1024];
	         while((date=stream.read(by))!=-1){
	              String temp=new String(by,0,date);
	              System.out.println(temp);
	         }
	         socket.shutdownInput();
	         //服务器给客户端一个相应
	         //打开输出流，发送数据
	         OutputStream os = socket.getOutputStream();
	         String name="我是服务器，客户端登录成功";
	         os.write(name.getBytes());

	         os.close();
	         stream.close();
		}

	}

package cn.day1;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.Socket;
import java.net.UnknownHostException;
	/*
	 * 客户端
	 */
	public class Socket {

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

			Socket so=new Socket("192.168.15.117",50000);
			//用输出流输出客户端请求
			OutputStream stream = so.getOutputStream();
			String name="娜娜";
			stream.write(name.getBytes());
			so.shutdownOutput();
			//服务器接收客户端反馈
			InputStream is = so.getInputStream();
			BufferedReader br=new BufferedReader(new InputStreamReader(is));
		    name="";
		    while((name=br.readLine())!=null){
		    	System.out.println(name);
		    }

			is.close();

			stream.close();
		}

	}

　　注意：用完一次服务器或客户端我们该关闭它们。

列如：

so.shutdownOutput();