go语言之UDP通信

服务端

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package main   import (     "fmt"     "net" )   func main() {     listen, err := net.ListenUDP("udp", &net.UDPAddr{         IP:   net.IPv4(0, 0, 0, 0),         Port: 30000,     })     if err != nil {         fmt.Println("listen failed, err:", err)         return     }     defer listen.Close()     for {         var data [1024]byte         n, addr, err := listen.ReadFromUDP(data[:]) // 接收数据         if err != nil {             fmt.Println("read udp failed, err:", err)             continue         }         fmt.Printf("data:%v addr:%v count:%v\n", string(data[:n]), addr, n)         _, err = listen.WriteToUDP(data[:n], addr) // 发送数据         if err != nil {             fmt.Println("write to udp failed, err:", err)             continue         }     } }

　　

客户端

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package main   import (     "fmt"     "net" )   func main() {     socket, err := net.DialUDP("udp", nil, &net.UDPAddr{         IP:   net.IPv4(0, 0, 0, 0),         Port: 30000,     })     if err != nil {         fmt.Println("连接服务端失败，err:", err)         return     }     defer socket.Close()     sendData := []byte("Hello server")     _, err = socket.Write(sendData) // 发送数据     if err != nil {         fmt.Println("发送数据失败，err:", err)         return     }     data := make([]byte, 4096)     n, remoteAddr, err := socket.ReadFromUDP(data) // 接收数据     if err != nil {         fmt.Println("接收数据失败，err:", err)         return     }     fmt.Printf("recv:%v addr:%v count:%v\n", string(data[:n]), remoteAddr, n) }