网络编程——TCP连接

TCP在双方传输数据前&＃xff0c;发送方先请求建立连接&＃xff0c;接收方同意建立连接后才能传输数据。&＃xff08;打电话&＃xff1a;先拨号&＃xff0c;等对方同意接听后&＃xff0c;才能交流&＃xff09;。。。高可靠性

UDP不需要建立连接&＃xff08;发短信&＃xff09;。不可靠&＃xff0c;可能出现数据丢失等&＃xff0c;但效率高&＃xff0c;实时性高。

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服务器端&＃xff1a;

import java.io.IOException;
import java.io.InputStream;
import java.net.ServerSocket;
import java.net.Socket;public class ServerSocketTest {public static void main(String[] args) throws IOException {// 新建一个服务器端的套接字 Server端监听10000端口ServerSocket serverSocket &＃61; new ServerSocket(10000);// 建立连接&＃xff0c;此时进入阻塞状态Socket socket &＃61; serverSocket.accept();System.out.println("Connected: " &＃43; socket.getRemoteSocketAddress());// socket从客户端读取数据InputStream inputStream &＃61; socket.getInputStream();byte[] b &＃61; new byte[1024];int length &＃61; inputStream.read(b);System.out.println(length &＃43; " Bytes Received");}}

客户端代码&＃xff1a;

import java.io.IOException;
import java.io.OutputStream;
import java.net.Socket;public class ClientSocketTest {public static void main(String[] args) throws IOException {//新建一个客户端的套接字

Socket socket &＃61; new Socket("127.0.0.1", 10000);// 用socket往服务器端发送数据

OutputStream outputStream &＃61; socket.getOutputStream();byte[] b &＃61; new byte[2];outputStream.write(b);}}

运行结果&＃xff1a;

Connected: /127.0.0.1:60361
2 Bytes Received