java网络编程之传输协议

1.传输层协议

2.tcp协议

import java.io.IOException;
import java.io.PrintStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;

import org.junit.Test;

public class TcpDemo {
//服务端
@Test
public void server() throws IOException{
//准备给客户端发送的数据
String data = "你来啦,最近好么?";

//创建服务端,指定端口号
ServerSocket server = new ServerSocket(8888);
System.out.println("服务端已经启动完毕...............");
//接收客户端的连接对象
while (true) {
Socket accept = server.accept();
System.out.println("连接过来的客户端是:"+accept.getInetAddress());//获取连接过来的客户端IP
//给客户端写出数据
PrintStream out = new PrintStream(accept.getOutputStream());
out.print(data);
out.close();
}
}
//客户端
@Test
public void client() throws Exception{
//创建客户端对象,并指定连接服务端的主机IP和端口
Socket client = new Socket("localhost",8888);
//获取服务端发送给客户端的数据
Scanner scanner = new Scanner(client.getInputStream());
while (scanner.hasNext()) {
String line = scanner.nextLine();
System.out.println(line);
}
scanner.close();
client.close();
}
}