golang post get 请求简介

桃扇骨 2021-09-03 10:17 481阅读 0赞

**目录**

1.get请求

2.http.Post的方式

3.http.PostForm的方式

4.http.NewRequest的方式

5.http.NewRequest实例

1.普通的post get请求

2. body全部二进制数据流进行post

3. 模拟web表单文件上传进行post

--------------------

## 1.get请求 ##

get请求可以直接http.Get方法，非常简单。

func httpGet() {
        resp, err := http.Get("http://www.01happy.com/demo/accept.php?id=1")
        if err != nil {
            // handle error
        }
     
        defer resp.Body.Close()
        body, err := ioutil.ReadAll(resp.Body)
        if err != nil {
            // handle error
        }
     
        fmt.Println(string(body))
    }

## 2.http.Post的方式 ##

func httpPost() {
        resp, err := http.Post("http://www.01happy.com/demo/accept.php",
            "application/x-www-form-urlencoded",
            strings.NewReader("name=cjb"))
        if err != nil {
            fmt.Println(err)
        }
     
        defer resp.Body.Close()
        body, err := ioutil.ReadAll(resp.Body)
        if err != nil {
            // handle error
        }
     
        fmt.Println(string(body))
    }

Tips：使用这个方法的话，第二个参数要设置成”application/x-www-form-urlencoded”，否则post参数无法传递。

## 3.http.PostForm的方式 ##

func httpPostForm() {
        resp, err := http.PostForm("http://www.01happy.com/demo/accept.php",
            url.Values{"key": {"Value"}, "id": {"123"}})
     
        if err != nil {
            // handle error
        }
     
        defer resp.Body.Close()
        body, err := ioutil.ReadAll(resp.Body)
        if err != nil {
            // handle error
        }
     
        fmt.Println(string(body))
     
    }

## 4.`http.NewRequest的方式` ##

有时需要在请求的时候设置头参数、cookie之类的数据，就可以使用http.Do方法。

func httpDo() {
        client := &http.Client{}
     
        req, err := http.NewRequest("POST", "http://www.01happy.com/demo/accept.php", strings.NewReader("name=cjb"))
        if err != nil {
            // handle error
        }
     
        req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
        req.Header.Set("Cookie", "name=anny")
     
        resp, err := client.Do(req)
     
        defer resp.Body.Close()
     
        body, err := ioutil.ReadAll(resp.Body)
        if err != nil {
            // handle error
        }
     
        fmt.Println(string(body))
    }

同上面的post请求，必须要设定Content-Type为application/x-www-form-urlencoded，post参数才可正常传递。

## 5.`http.NewRequest实例` ##

### 1.普通的post get请求 ###

var r http.Request
    r.ParseForm()
    r.Form.Add("uuid", orderUUID)
    bodystr := strings.TrimSpace(r.Form.Encode())
    request, err := http.NewRequest("GET", url, strings.NewReader(bodystr))
    if err != nil {
     　　//TODO:  
    }
    request.Header.Set("Content-Type", "application/x-www-form-urlencoded")
    request.Header.Set("Connection", "Keep-Alive")
    
    var resp *http.Response
    resp, err = http.DefaultClient.Do(request)
    if err != nil {
    　　//TODO:
    }

### 2. body全部二进制数据流进行post ###

//body提交二进制数据
    func DoBytesPost(url string, data []byte) ([]byte, error) {
    
        body := bytes.NewReader(data)
        request, err := http.NewRequest(POST_METHOD, url, body)
        if err != nil {
            log.Println("http.NewRequest,[err=%s][url=%s]", err, url)
            return []byte(""), err
        }
        request.Header.Set("Connection", "Keep-Alive")
        var resp *http.Response
        resp, err = http.DefaultClient.Do(request)
        if err != nil {
            log.Println("http.Do failed,[err=%s][url=%s]", err, url)
            return []byte(""), err
        }
        defer resp.Body.Close()
        b, err := ioutil.ReadAll(resp.Body)
        if err != nil {
            log.Println("http.Do failed,[err=%s][url=%s]", err, url)
        }
        return b, err
    }

### 3. 模拟web表单文件上传进行post ###

func newfileUploadRequest(uri string, params map[string]string, paramName, path string) (*http.Request, error) {
        file, err := os.Open(path)
        if err != nil {
            return nil, err
        }
        defer file.Close()
    
        body := &bytes.Buffer{}
        writer := multipart.NewWriter(body)
        part, err := writer.CreateFormFile(paramName, path)
        if err != nil {
            return nil, err
        }
        _, err = io.Copy(part, file)
    
        for key, val := range params {
            _ = writer.WriteField(key, val)
        }
        err = writer.Close()
        if err != nil {
            return nil, err
        }
        request, err := http.NewRequest("POST", uri, body)
        request.Header.Set("Content-Type", writer.FormDataContentType())
        return request, err
    }