JAVA视频学习笔记-马士兵(十)

JAVA视频学习笔记(十)

网络编程_网络基础(20200721)

1. 网络编程!=网站编程：
   　　网络编程是指程序实现网络交互,网络通信；
   　　网站编程特指ASP,PHP,JSP等纯网页设计语言编写的程序。
2. 网络基础概念　　
   

网络编程_网络基础(20200722)

1. 网络基础概念　　
   
   
   

网络编程_TCP_Socket1(20200723)

1. Socket：
   

2. Socket通信模型
   

3. Socket举例：
   

import java.net.*;
import java.io.*;

public class TCPServer {
	public static void main(String[] args) throws Exception {
		ServerSocket ss = new ServerSocket(6666);
		while(true) {
			Socket s = ss.accept();
System.out.println("a client connect!");
			DataInputStream dis = new DataInputStream(s.getInputStream());
			System.out.println(dis.readUTF());
			dis.close();
			s.close();
		}
		
	}
}

import java.net.*;
import java.io.*;

public class TCPClient {
	public static void main(String[] args) throws Exception {
		Socket s = new Socket("127.0.0.1", 6666);
		OutputStream os = s.getOutputStream();
		DataOutputStream dos = new DataOutputStream(os);
		Thread.sleep(30000);
		dos.writeUTF("hello server!");
		dos.flush();
		dos.close();
		s.close();
	}
}

网络编程_TCP_Socket2(20200724)

1. TCP Socket通信模型：
   
2. TCP Socket通信举例
   

/*	范例名称：简单的client/server程序
 * 	源文件名称：TestClient.java/TestServer.java
 *	要  点：
 *		1. Java Socket编程步骤
 *		2. Socket/ServerSocket类用法
 *		3. 通过Socket对象可以获取通信对方Socket的信息
 */
import java.net.*;
import java.io.*;

public class TestServer {
	public static void main(String args[]) {
		try {		
			ServerSocket s = new ServerSocket(8888);
			while (true) {
				Socket s1 = s.accept();
				OutputStream os = s1.getOutputStream();
				DataOutputStream dos = new DataOutputStream(os);
				dos.writeUTF("Hello," + s1.getInetAddress() + 
						"port#" +s1.getPort() + "  bye-bye!");
				dos.close();
				s1.close();
			}
		}catch (IOException e) {
			e.printStackTrace();
			System.out.println("程序运行出错:" + e);			
		}
	}
}

/*	范例名称：简单的client/server程序
 * 	源文件名称：TestClient.java/TestServer.java
 *	要  点：
 *		1. Java Socket编程步骤
 *		2. Socket/ServerSocket类用法
 *		3. 通过Socket对象可以获取通信对方Socket的信息
 */

import java.net.*;
import java.io.*;

public class TestClient {
	public static void main(String args[]) {
		try {
			Socket s1 = new Socket("127.0.0.1", 8888);
			InputStream is = s1.getInputStream();
			DataInputStream dis = new DataInputStream(is);
			System.out.println(dis.readUTF());
			dis.close();
			s1.close();
		} catch (ConnectException connExc) {
			connExc.printStackTrace();
			System.err.println("服务器连接失败！");
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}

网络编程_TCP_Socket3(20200725)

1. Socket代码分析：

import java.io.*;
import java.net.*;
import java.applet.Applet;
public class talkserver
{
	public static void main(String args[])
	{
		try
		{
			ServerSocket server = null;
			try
			{
				server = new ServerSocket(4700);
			}catch(Exception e)
			{
				System.out.println("can not listen to:" + e);
			}
			Socket socket = null;
			try
			{
				socket = server.accept();
			}catch(Exception e)
			{
				System.out.println("Error:" + e);
			}
			String line;
			BufferedReader is = new BufferedReader(new InputStreamReader(
				socket.getInputStream()));
			PrintWriter os = new PrintWriter(socket.getOutputStream());
			BufferedReader sin = new BufferedReader(new InputStreamReader(System.in));
			System.out.println("Client:" + is.readLine());
			line = sin.readLine();
			while (!line.equals("bye"))	
			{
				os.println(line);
				os.flush();
				System.out.println("Server:" + line);
				System.out.println("Client:" + is.readLine());
				line = sin.readLine();
			}

			is.close();
			os.close();
			socket.close();
			server.close();
		}catch(Exception e)
		{
			System.out.println("Error" + e);
		}
	}
}
			

import java.io.*;
import java.net.*;
public class talkclient
{
	public static void main(String args[])
	{
		try
		{
			Socket socket = new Socket("127.0.0.1",4700);
			BufferedReader sin = new BufferedReader(new InputStreamReader(System.in));
			PrintWriter os = new PrintWriter(socket.getOutputStream());
			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);
		}
	}
}

网络编程_UDP(20200726）

1. UDP：
   

import java.net.*;
import java.io.*;

public class TestUDPServer
{
	public static void main(String args[]) throws Exception
	{
		byte buf[] = new byte[1024];
		DatagramPacket dp = new DatagramPacket(buf, buf.length);
		DatagramSocket ds = new DatagramSocket(5678);
		while(true)
		{
			ds.receive(dp);
			ByteArrayInputStream bais = new ByteArrayInputStream(buf);
			DataInputStream dis = new DataInputStream(bais);
			System.out.println(dis.readLong());
		}
	}
}

import java.net.*;
import java.io.*;

public class TestUDPClient
{
	public static void main(String args[]) throws Exception
	{
		long n = 10000L;
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		DataOutputStream dos = new DataOutputStream(baos);
		dos.writeLong(n);
		
		byte[] buf = baos.toByteArray();
System.out.println(buf.length);
		
		DatagramPacket dp = new DatagramPacket(buf, buf.length, 
											   new InetSocketAddress("127.0.0.1", 5678)
											   );
		DatagramSocket ds = new DatagramSocket(9999);
		ds.send(dp);
		ds.close();
		
	}
}