GoLang/Javascript：在 JSON POST 上清空 postForm

Question

我正在尝试将 JSON 数据从 javascript 页面 POST 到 golang 服务器，但我无法在两端使用 SO 接受的答案找到任何 JSON 数据的痕迹。

这篇文章展示了我在 Javascript 中发布我的 JSON的方式，这篇文章展示了我尝试在 Go 中处理这个 JSON 的方式。

//js json post send

var request = new XMLHttpRequest();

request.open('POST', 'http://localhost:8080/aardvark/posts', true);

request.setRequestHeader('Content-Type', 'application/json; charset=UTF-8');

var data = {hat: "fez"};

request.send(JSON.stringify(data));

//Go json post response

func reply(w http.ResponseWriter, r *http.Request) {

    w.Header().Set("Access-Control-Allow-Origin", "*")

    w.Header().Set("Access-Control-Allow-Credentials", "true")

    w.Header().Set("Access-Control-Allow-Headers", "Content-Type, Content-Length, Accept-Encoding, X-CSRF-Token, Authorization, accept, origin, Cache-Control, X-Requested-With")

    w.Header().Set("Access-Control-Allow-Methods", "POST, OPTIONS, GET, PUT")

    if err := r.ParseForm(); err != nil {

        fmt.Println(err);

    }

    //this is my first impulse.  It makes the most sense to me.

    fmt.Println(r.PostForm);          //out -> `map[]`  would be `map[string]string` I think

    fmt.Println(r.PostForm["hat"]);   //out -> `[]`  would be `fez` or `["fez"]`

    fmt.Println(r.Body);              //out -> `&{0xc82000e780 <nil> <nil> false true {0 0} false false false}`

    type Hat struct {

        hat string

    }

    //this is the way the linked SO post above said should work.  I don't see how the r.Body could be decoded.

    decoder := json.NewDecoder(r.Body)

    var t Hat   

    err := decoder.Decode(&t)

    if err != nil {

        fmt.Println(err);

    }

    fmt.Println(t);                  //out -> `{ }`

}

我不确定从这里还可以尝试什么。我应该改变什么才能使这项工作？

Answer 1

导出hat结构Hat和 json 解码的字段将起作用。type Hat struct {&nbsp; &nbsp; Hat string // Exported field names begins with capital letters}