7.3 http客户端（GET、POST、POSTFORM、DO）

示例：

1、实现Get请求方法

  1. package main
  3. import (
  4.    "fmt"
  5.    "io/ioutil"
  6.    "net/http"
  7. )
  9. func main() {
  10.    requestUrl := "http://www.baidu.com"
  11.    response, err := http.Get(requestUrl)
  13.    if err != nil {
  14.       fmt.Println(err)
  15.    }
  17.    defer response.Body.Close()
  19.    body, _ := ioutil.ReadAll(response.Body)
  20.    fmt.Println(string(body))
  21. }

2、实现post请求方法

  1. package main
  3. import (
  4.    "bytes"
  5.    "fmt"
  6.    "io/ioutil"
  7.    "net/http"
  8.    "net/url"
  9. )
  11. func main() {
  12.    requestUrl := "http://www.baidu.com/"
  13.    postValue := url.Values{
  14.       "username": {"aa"},
  15.       "address":  {"bb"},
  16.       "subject":  {"cc"},
  17.       "form":     {"dd"},
  18.    }
  19.    //request, err := http.PostForm(requestUrl, postValue)
  21.    body := bytes.NewBufferString(postValue.Encode())
  22.    request, err := http.Post(requestUrl, "text/html", body)
  23.    if err != nil {
  24.       fmt.Println(err)
  25.    }
  27.    defer request.Body.Close()
  28.    fmt.Println(request.StatusCode)
  29.    if request.StatusCode == 200 {
  30.       rb, err := ioutil.ReadAll(request.Body)
  31.       if err != nil {
  32.          fmt.Println(rb)
  33.       }
  34.       fmt.Println(string(rb))
  35.    }
  36. }

3、 实现PostForm请求方法

  1. package main
  3. import (
  4.    "fmt"
  5.    "io/ioutil"
  6.    "net/url"
  7.    "net/http"
  8. )
  10. func main() {
  11.    requestUrl := "http://www.baidu.com/"
  12.    postValue := url.Values{
  13.       "username": {"aa"},
  14.       "address":  {"bb"},
  15.       "subject":  {"cc"},
  16.       "form":     {"dd"},
  17.    }
  18.    request, err := http.PostForm(requestUrl, postValue)
  19.    if err != nil {
  20.       fmt.Println(err)
  21.    }
  23.    defer request.Body.Close()
  24.    fmt.Println(request.StatusCode)
  25.    if request.StatusCode == 200 {
  26.       rb, err := ioutil.ReadAll(request.Body)
  27.       if err != nil {
  28.          fmt.Println(rb)
  29.       }
  30.       fmt.Println(string(rb))
  31.    }
  32. }

4、http.Do

使用http.Do方法可以在请求的时候设置头参数、cookie之类的数据。

  1. package main
  3. import (
  4.    "fmt"
  5.    "io/ioutil"
  6.    "net/http"
  7. )
  9. func main() {
  10.    client := &http.Client{}
  12.    request, err := http.NewRequest("GET", "http://www.baidu.com", nil)
  13.    if err != nil {
  14.       fmt.Println(err)
  15.    }
  17.    cookie := &http.Cookie{Name: "JERRY", Value: "dkfsf"}
  18.    request.AddCookie(cookie) //向request中添加cookie
  20.    //设置request的header
  21.    request.Header.Set("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8")
  23.    response, err := client.Do(request)
  24.    if err != nil {
  25.       fmt.Println(err)
  26.       return
  27.    }
  29.    defer response.Body.Close()
  30.    fmt.Println(response.StatusCode)
  31.    if response.StatusCode == 200 {
  32.       r, err := ioutil.ReadAll(response.Body)
  33.       if err != nil {
  34.          fmt.Println(err)
  35.       }
  36.       fmt.Println(string(r))
  37.    }
  38. }

links