webserver in go lang

hello.go

package main

import (
  "fmt"
  "log"
  "net/http"
)

func sayHello(responseWriter http.ResponseWriter, request *http.Request) {
  request.ParseForm()       //解析表单参数
  fmt.Println(request.Form) //打印请求的相关信息
  fmt.Println("path:", request.URL.Path)
  fmt.Println("UserAgent:", request.UserAgent())
  for k, v := range request.Form {
      fmt.Printf("key: %s, value: %s.\n", k, v)
  }
  fmt.Fprintf(responseWriter, "Hello, Golang.") //写入writer
}

type MyHttpHandler struct{} //定义一个实现了Http.Handler接口的类型

func (handler *MyHttpHandler) ServeHTTP(responseWriter http.ResponseWriter, request *http.Request) {
  if request.URL.Path == "/" {
      sayHello(responseWriter, request)
  } else {
      http.NotFound(responseWriter, request)
  }
}

func main() {
  http.HandleFunc("/", sayHello)              //设置访问的路由:第一个参数为路径，第二个参数是对应的处理函数
  error := http.ListenAndServe(":18188", nil) //设置端口监听,返回错误信息
  if error != nil {
      log.Fatal("ListenAndServe: ", error)
  }
  myHttpHandler := &MyHttpHandler{}
  http.ListenAndServe(":19199", myHttpHandler) //调用自定义HttpHandler
}