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