JAVA socket编程学习笔记

Socket是网络编程，而不是简单的网页编程，它与J2EE编写网页代码还是有很大的区别的，Socket更接近底层一点，所以难度稍稍大一点。

 

import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;


public class TCPServer {

	public static void main(String[] args) {
		try {
			ServerSocket serverSocket = new ServerSocket(3333);
			while(true){
				Socket socket = serverSocket.accept();
				System.out.println("接收了用户的请求");
				ServerSendThread sst = new ServerSendThread(new TCPServer(),socket);
				Thread thread = new Thread(sst);
				thread.start();
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
	public void serverSend(Socket s){
		OutputStream outputStream;
		try {
			outputStream = s.getOutputStream();
			DataOutputStream dos = new DataOutputStream(outputStream);
			dos.writeUTF("server sent data：huangbiao");
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
	public void serverReceive(Socket s){
		try {
			InputStream inputStream = s.getInputStream();
			DataInputStream dis = new DataInputStream(inputStream);
			String temp = dis.readUTF();
			System.out.println("server receive data is:" + temp);
		} catch (IOException e) {
			e.printStackTrace();
		}
		
	}
}

 

import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
import java.net.UnknownHostException;


public class TCPClient {

	public static final int PORT = 3333;
	public static final String IP = "127.0.0.1";
	public static void main(String[] args) {
		try {
			Socket socket = new Socket(IP,PORT);
			ClientReceiveThread crt = new ClientReceiveThread(new TCPClient(),socket);
			Thread thread = new Thread(crt);
			thread.start();
			
		} catch (UnknownHostException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
	public void clientReceive(Socket s){
		InputStream inputStream;
		try {
			inputStream = s.getInputStream();
			DataInputStream dis = new DataInputStream(inputStream);
			String str = dis.readUTF();
			System.out.println("client receive data is:"+str);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
	public void clientSent(Socket s){
		try {
			OutputStream outputStream = s.getOutputStream();
			DataOutputStream dos = new DataOutputStream(outputStream);
			dos.writeUTF("client sent data is huangbiao");
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}

 注意事项：

1、在Socket编程中，端口号尽量选择1024之后的端口号，因为在这之前很多端口号可能被很多知名的协议或者是网站占用了，所以为了降低冲突，选择不常用的端口号
2、TCP和UDP都有65535个端口，也就是说tcp 80 和 UDP 80端口是不一致的
3、client和server这两个只针对TCP协议而言，UDP协议是没有这个说法的，因为UDP只关注发送不管是否对方接收
4、server和client两端都可以读和写数据流，只有一端写了之后另一端才能读，我这样强调的目的是为了说明读写是有顺序的