golang实现一个简单的HTTP server

目标:用golang实现一个简单的HTTP Server，支持指定监听端口，将收到的POST的payload中的内容打印出来

golang环境准备

• 可以参考https://blog.csdn.net/ljyfree/article/details/123810868
• 建议安装的版本最好是不低于golang-1.18

Server的实现

• 直接贴

  admin@hpc-1:~/go$ cat http_rpc_server.go
  package main

  import (
  "fmt"
  "log"
  "flag"
  "net/http"
  "encoding/json"
  )

  // 定义一个用于接收请求的结构体
  type MapPrinter struct{}

  // 定义一个用于接收请求的方法
  func (m *MapPrinter) PrintMap(w http.ResponseWriter, r *http.Request) {
  if r.Method != http.MethodPost {
  http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
  return
  }

    var payload map[string]interface{}
    err := json.NewDecoder(r.Body).Decode(&payload)
    if err != nil {
        http.Error(w, "Invalid payload", http.StatusBadRequest)
        return
    }
  
    fmt.Println("Received payload:")
    for key, value := range payload {
        fmt.Printf("%s: %v\n", key, value)
    }
  
    w.WriteHeader(http.StatusOK)
    w.Write([]byte("Map printed successfully\n"))
  

  }

  func main() {
  //获取监听端口，默认8080
  port := flag.String("p", "8080", "指定监听端口")
  // 解析命令行参数
  flag.Parse()

    //注册abc-api路由
    http.HandleFunc("/abc-api", new(MapPrinter).PrintMap)
  
    fmt.Println("Server is listening on port %s...", *port)
    log.Fatal(http.ListenAndServe(":" + *port, nil))
  

  }
  admin@hpc-1:~/go$

• 编译

  admin@hpc-1:~/go$ go build -o http_rpc_server http_rpc_server.go
  admin@hpc-1:~/go$

• 终端1上，运行server监听8090端口

  admin@hpc-1:~/go$ ./http_rpc_server -p 8090
  Server is listening on port 8090...

验证

• 使用curl在终端2上发送POST Request,payload带着map(字典)

  admin@hpc-1:~$ curl -vX POST -H "Content-Type: application/json" -d '{"key1":"value1", "key2":"value2"}' http://localhost:8090/abc-api
  Note: Unnecessary use of -X or --request, POST is already inferred.

  • Trying 127.0.0.1:8090...
  • TCP_NODELAY set
  • Connected to localhost (127.0.0.1) port 8090 (#0)

  POST /abc-api HTTP/1.1
  Host: localhost:8090
  User-Agent: curl/7.68.0
  Accept: /
  Content-Type: application/json
  Content-Length: 34

  • upload completely sent off: 34 out of 34 bytes
  • Mark bundle as not supporting multiuse
    < HTTP/1.1 200 OK
    < Date: Sun, 28 Jan 2024 00:51:25 GMT
    < Content-Length: 25
    < Content-Type: text/plain; charset=utf-8
    <
    Map printed successfully
  • Connection #0 to host localhost left intact
    admin@hpc-1:~$

• 回看终端1，已经将map解析并打印出来

  admin@hpc-1:~/go$ ./http_rpc_server -p 8090
  Server is listening on port %s... 8090
  Received payload:
  key1: value1
  key2: value2