Go 即使提供了匹配的数据结构,也会解组json错误
我从GoogleGo语言开始,试图编写一个简单的程序,从Facebook的GraphAPI获取Json对象,并将其解组 根据文档,我应该提供一个匹配的数据结构,例如,如果json对象是:Go 即使提供了匹配的数据结构,也会解组json错误,go,json,unmarshalling,Go,Json,Unmarshalling,我从GoogleGo语言开始,试图编写一个简单的程序,从Facebook的GraphAPI获取Json对象,并将其解组 根据文档,我应该提供一个匹配的数据结构,例如,如果json对象是: { Name: "Alice" Body: "Hello", Time: 1294706395881547000, } 数据结构如下所示: type Message struct { Name string Body string Time int64 } {
{
Name: "Alice"
Body: "Hello",
Time: 1294706395881547000,
}
数据结构如下所示:
type Message struct {
Name string
Body string
Time int64
}
{
"id": "350685531728",
"name": "Facebook for Android",
"description": "Keep up with friends, wherever you are.",
"category": "Utilities",
"subcategory": "Communication",
"link": "http://www.facebook.com/apps/application.php?id=350685531728",
"namespace": "fbandroid",
"icon_url": "http://static.ak.fbcdn.net/rsrc.php/v2/yo/r/OKB7Z2hkREe.png",
"logo_url": "http://photos-b.ak.fbcdn.net/photos-ak-snc7/v43/207/227200684078827/app_115_227200684078827_474764570.png",
"company": "Facebook"
}
在我的例子中,我的json如下所示:
type Message struct {
Name string
Body string
Time int64
}
{
"id": "350685531728",
"name": "Facebook for Android",
"description": "Keep up with friends, wherever you are.",
"category": "Utilities",
"subcategory": "Communication",
"link": "http://www.facebook.com/apps/application.php?id=350685531728",
"namespace": "fbandroid",
"icon_url": "http://static.ak.fbcdn.net/rsrc.php/v2/yo/r/OKB7Z2hkREe.png",
"logo_url": "http://photos-b.ak.fbcdn.net/photos-ak-snc7/v43/207/227200684078827/app_115_227200684078827_474764570.png",
"company": "Facebook"
}
因此,我提供了一个匹配的数据结构:
type Graph struct {
id string
name string
description string
category string
subcategory string
link string
namespace string
icon_url string
logo_url string
company string
}
代码如下:
package main
import "fmt"
import "net/http"
import "io/ioutil"
import "encoding/json"
type Graph struct {
id string
name string
description string
category string
subcategory string
link string
namespace string
icon_url string
logo_url string
company string
}
func main() {
fmt.Println("Hello, playground")
resp, err := http.Get("http://graph.facebook.com/android")
if err != nil {
fmt.Println("http.Get err: ",err)// handle error
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
fmt.Println("resp.Body: ", resp.Body)
fmt.Println("body: ",string(body))
fmt.Println("err: ",err)
var g Graph
err = json.Unmarshal(body, &g)
if err == nil {
fmt.Println("graph: ", g)
} else {
fmt.Println("graph error: ",err) // <---error at this line
}
}
有什么想法吗
谢谢 字段
id
未报告,因为它以小写字母开头。请参阅。所有给定字段均为小写,因此未报告。为了解组到结构中,您需要使用
例如,在您的案例中,有效的结构是
type Graph struct {
Id string `json:"id"`
Name string `json:"name"`
Description string `json:"description"`
Category string `json:"category"`
Subcategory string `json:"subcategory"`
Link string `json:"link"`
Namespace string `json:"namespace"`
Icon_url string `json:"icon_url"`
Logo_url string `json:"logo_url"`
Company string `json:"company"`
}
但是,由于encoding/json的行为方式,(没有链接,对不起,我有点着急),您可能完全可以不用标记。只需确保您的字段名已导出即可