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chapter4.md

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第4章 处理请求

  • 处理请求的示例

      package main

  import (
      "net/http"
      "fmt"
      "io/ioutil"
  )

  func headers(w http.ResponseWriter, r *http.Request){
      h := r.Header
      fmt.Fprintln(w, h)
      fmt.Fprintln(w, h["Accept-Encoding"])
  }

  func body(w http.ResponseWriter, r *http.Request){
      len := r.ContentLength
      body := make([]byte, len)
      r.Body.Read(body)
      fmt.Fprintln(w, string(body))
  }

  func process(w http.ResponseWriter, r *http.Request) {
      r.ParseForm()
      fmt.Fprintln(w, r.Form)
      fmt.Fprintln(w, r.MultipartForm)
  }

  func formValue(w http.ResponseWriter, r *http.Request){
      fmt.Fprintln(w, r.FormValue("key"))
      fmt.Fprintln(w, r.PostFormValue("key2"))
  }

  func file(w http.ResponseWriter, r *http.Request) {
      r.ParseMultipartForm(1024)
      fileHeader := r.MultipartForm.File["uploaded"][0]
      file, err := fileHeader.Open()
      if err == nil {
          data, err := ioutil.ReadAll(file)
          if err == nil  {
              fmt.Fprintln(w, string(data))
          }
      }
  }

  func writeHtml(w http.ResponseWriter, r *http.Request) {
      str := `<html><body>Go Web</body></html>`
      w.Write([]byte(str))
  }

  func write501(w http.ResponseWriter, r *http.Request){
      w.WriteHeader(501)
      fmt.Fprintln(w, "no such service")
  }

  func write302(w http.ResponseWriter, r *http.Request) {
      w.Header().Set("Location", "https://baidu.com")
      w.WriteHeader(302)
  }

  func main() {
      server := http.Server{
          Addr: "127.0.0.1:8080",
      }
      http.HandleFunc("/headers", headers)
      http.HandleFunc("/body", body)
      http.HandleFunc("/process", process)
      server.ListenAndServe()
  }