component-全局透明遮罩层与点击遮罩层关闭

server.go

package main

import (
        "bufio"
        "bytes"
        "fmt"
        "golang.org/x/text/encoding/unicode"
        "golang.org/x/text/transform"
        "io"
        "net"
        "os"
        "strings"
        "time"
)

func main() {

        addr, err := net.ResolveUDPAddr("udp", ":8080")
        if err != nil {
                panic(err)
        }

        conn, err := net.ListenUDP("udp", addr)

        if err != nil {
                panic(err)
        }
        defer conn.Close()

        buf := make([]byte, 1024)

        utf8Decoder := unicode.UTF8.NewDecoder()
        for {
                n, addr, err := conn.ReadFromUDP(buf)
                if err != nil {
                        fmt.Println("read error: ", err)
                        continue
                }

                decodedReader := transform.NewReader(bufio.NewReader(bytes.NewReader(buf[:n])), utf8Decoder)
                decodedBytes, _ := io.ReadAll(decodedReader)

                fmt.Printf("Received from [%s] and the message is\n%s\n", addr, string(decodedBytes))

                reader := bufio.NewReader(os.Stdin)
                fmt.Println("Enter message: ")
                response, _ := reader.ReadString('\n')

                response = time.Now().Format(time.RFC3339) + " " + response

                utf8Encoder := unicode.UTF8.NewEncoder()

                // 使用 UTF-8 编码器编码要发送的数据
                encodedReader := transform.NewReader(strings.NewReader(response), utf8Encoder)
                encodedBytes, _ := io.ReadAll(encodedReader)

                conn.WriteToUDP(encodedBytes, addr)
        }
}

client.go

package main

import (
        "bufio"
        "bytes"
        "fmt"
        "golang.org/x/text/encoding/unicode"
        "golang.org/x/text/transform"
        "io"
        "net"
        "os"
        "strings"
        "time"
)

func main() {

        addr, err := net.ResolveUDPAddr("udp", "localhost:8080")

        if err != nil {
                panic(err)

        }

        conn, err := net.DialUDP("udp", nil, addr)
        if err != nil {
                panic(err)
        }
        defer conn.Close()

        reader := bufio.NewReader(os.Stdin)
        buf := make([]byte, 1024)
        for {

                fmt.Println("Enter message: ")
                message, _ := reader.ReadString('\n')

                message = time.Now().Format(time.RFC3339) + " " + message

                utf8Encoder := unicode.UTF8.NewEncoder()
                encodedReader := transform.NewReader(strings.NewReader(message), utf8Encoder)
                encodedBytes, _ := io.ReadAll(encodedReader)

                conn.Write(encodedBytes)

                n, _, err := conn.ReadFromUDP(buf)

                if err != nil {
                        fmt.Println("read err: ", err)
                        continue
                }

                utf8Encoder_ := unicode.UTF8.NewDecoder()

                decodedReader := transform.NewReader(bufio.NewReader(bytes.NewReader(buf[:n])), utf8Encoder_)
                decodedBytes, _ := io.ReadAll(decodedReader)

                fmt.Printf("Received from [%s] and the message is\n%s\n", addr, string(decodedBytes))
        }

}

抓包分析

分析这个包

这里有一个知识点，5分唯一性？ 就是 src + src:port + 协议 + dst + dst:port
然后又可以扯远 timeout 、端口复用