如何在 Go 中的 HTTP POST 请求正文中发送变量（在代码中声明）？ [复制]

Question

我使用的是 Golang 的 HTTP 客户端，POST 请求的格式如下：

package main

import (
    "log"

    "github.com/monaco-io/request"
)
var name,pass string.  //assume name and pass hold a value calculated earlier
func main() {
    client := request.Client{
        URL:    "https://google.com",
        Method: "POST",
        Params: map[string]string{"random": "random"},
        **Body:   []byte(`{"username": "ABC", "password": "XYZ"}`)**,
    }
    resp, err := client.Do()

    log.Println(resp.Code, string(resp.Data), err)
}

我想用我的变量 name 替换“ABC”，用我的变量 pass 替换“XYZ”。** 如何用变量替换常量字符串值它包含在我的代码中的函数中计算的一些字符串值。

Answer 1

只需使用fmt.Sprintf函数

fmt.Sprintf(`{"username": "%s", "password": "%s"}`, name, pass)

https://golang.org/pkg/fmt/#Sprintf

完整的代码如下所示

package main

import (
    "fmt"
    "log"


    "github.com/monaco-io/request"  // must be v0.0.2
)

var name, pass string //assume name and pass hold a value calculated earlier

func main() {
    client := request.Client{
        URL:    "https://google.com",
        Method: "POST",
        Params: map[string]string{"random": "random"},
        Body:   []byte(fmt.Sprintf(`{"username": "%s", "password": "%s"}`, name, pass)),
    }
    resp, err := client.Do()

    log.Println(resp.Code, string(resp.Data), err)
}