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。
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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