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更新udp

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This commit is contained in:
yumaojun03 2026-03-29 17:54:32 +08:00
parent bad6325f62
commit d2a4c831a4
7 changed files with 120 additions and 5 deletions
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18
day09/goroutine/arch.drawio
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@ -79,6 +79,24 @@
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22
day09/tcp/flow.drawio
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2
day09/upd/README.md Normal file
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@ -0,0 +1,2 @@
# UDP编程

2
day09/upd/client/README.md Normal file
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@ -0,0 +1,2 @@
# 客户端

39
day09/upd/client/main.go Normal file
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@ -0,0 +1,39 @@
package main
import (
"fmt"
"io"
"net"
)
func main() {
// 1. 连接服务器
conn, err := net.Dial("udp", "localhost:9999")
if err != nil {
fmt.Println("Error connecting:", err)
return
}
defer conn.Close()
fmt.Println("Connected to server")
// 2. 发送数据
_, err = conn.Write([]byte("Hello, Server! I am a client."))
if err != nil {
fmt.Println("Error writing data:", err)
return
}
fmt.Println("Written 22 bytes:", "Hello, Server! I am a client.")
// 3. 接收数据
buf := make([]byte, 1500)
n, err := conn.Read(buf)
if err == io.EOF {
fmt.Println("Server closed connection")
return
}
if err != nil {
fmt.Println("Error reading data:", err)
return
}
fmt.Println("Read", len(buf), "bytes:", "Hello, Server! I have received your message: "+string(buf[:n])+"\n")
}

2
day09/upd/server/README.md Normal file
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@ -0,0 +1,2 @@
# 服务端

40
day09/upd/server/main.go Normal file
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@ -0,0 +1,40 @@
package main
import (
"fmt"
"log"
"net"
)
func main() {
// 监听 UDP 9999，可接收任意客户端数据报
pc, err := net.ListenPacket("udp", ":9999")
if err != nil {
log.Fatal(err)
}
defer pc.Close()
fmt.Println("Server is listening on port 9999")
// 循环读取数据
for {
// 准备一个buf来读取包的内容
buf := make([]byte, 1024)
n, addr, err := pc.ReadFrom(buf)
// 如果读取失败，则继续下一次循环
if err != nil {
fmt.Println("Error reading data:", err)
continue
}
// 业务处理: 打印读取到的数据
fmt.Println("Read", n, "bytes from", addr)
fmt.Println("Data:", string(buf[:n])+"\n")
// 写入数据(回复客户端， 回一个包)
_, err = pc.WriteTo([]byte("Hello, Client! I have received your message: "+string(buf[:n])+"\n"), addr)
if err != nil {
fmt.Println("Error writing data:", err)
continue
}
fmt.Println("Written", len(buf), "bytes to", addr)
}
}