JSON 编码返回空白 Golang

Question

<分区>

Answer 1

通过the first character of the identifier's name a Unicode upper case letter (Unicode class "Lu")导出字段名.

试试这个:

package main

import (
    "encoding/json"
    "fmt"
    "log"
    "net/http"
)

type User struct {
    Uuid string
}

func handler(responseWriter http.ResponseWriter, r *http.Request) {
    user := User{Uuid: "id1234657..."} // Set uuid as string to user struct
    fmt.Println(user)                 // check it has the uuid
    responseWriter.Header().Set("Content-Type", "application/json")
    responseWriter.WriteHeader(http.StatusCreated)
    json.NewEncoder(responseWriter).Encode(user)
}

func main() {
    http.HandleFunc("/", handler)            // set router
    err := http.ListenAndServe(":9090", nil) // set listen port
    if err != nil {
        log.Fatal("ListenAndServe: ", err)
    }
}

输出(http://localhost:9090/):

{"Uuid":"id1234657..."}