实现 UDP

UDP server

use std::io;
use std::net::UdpSocket;
fn main() -> io::Result<()> {
    let socket = UdpSocket::bind("127.0.0.1:8080")?;
    loop {
        let mut buffer = [0u8; 1024];
        let (amt, src) = socket.recv_from(&mut buffer)?;
        println!("size: {}", amt);
        let buffer = &mut buffer[..amt];
        buffer.reverse();
        socket.send_to(&buffer, src)?;
    }
}

UDP client

use std::io;
use std::net::UdpSocket;
use std::str;
fn main() -> io::Result<()> {
    let socket = UdpSocket::bind("127.0.0.1:8000")?;
    socket.connect("127.0.0.1:8080")?;
    loop {
        let mut input = String::new();
        io::stdin().read_line(&mut input)?;
        socket.send(input.as_bytes())?;
        let mut buffer = [0u8; 1024];
        let (amt, _) = socket.recv_from(&mut buffer)?;
        println!(
            "receive from server :{}",
            str::from_utf8(&buffer[..amt]).expect("Can not convert to utf8")
        );
    }
}