英文:
Why am I not able to decode this JSON with golang? It always prints an empty string
问题
我在我的服务器上有一个非常简单的JSON文件，内容如下：
{"first_name": "John","last_name": "Doe"}
然后我编写了一个用于打印出名字的Golang脚本：
package mainimport ("fmt""net/http""encoding/json")type Person struct {FirstName string `json:"first_name"`LastName string `json:"last_name"`}func main() {url := "http://myserver.com/test.json"res, err := http.Get(url)if err != nil {fmt.Printf("%s", err)}defer res.Body.Close()var person Persondec := json.NewDecoder(res.Body).Decode(&person)if dec != nil {fmt.Printf("%s", dec)}fmt.Println(person.FirstName)}
但是，当我运行go run test.go时，它总是只打印一个换行符。我做错了什么？
英文:
I have a JSON file on my server that is very simple, just
{"first_name": "John","last_name": "Doe"}
I then wrote a golang script to print out the first name:
package mainimport ("fmt""net/http""encoding/json")type Person struct {FirstName string `json: "first_name"`LastName string `json: "last_name"`}func main() {url := "http://myserver.com/test.json"res, err := http.Get(url)if err != nil {fmt.Printf("%s", err)}defer res.Body.Close()var person Persondec := json.NewDecoder(res.Body).Decode(&person)if dec != nil {fmt.Printf("%s", dec)}fmt.Println(person.FirstName)}
But if I type go run test.go it always just prints a newline character seemingly.
What am I doing wrong?
答案1
得分: 2
你的代码正在搜索json中的FirstName和LastName键。如果你想让结构标签生效，你需要在冒号和引号之间去掉空格，即json:"first_name"。
你可以参考这个链接了解更多关于结构标签的信息：https://golang.org/pkg/reflect/#StructTag
英文:
Your code is searching FirstName and LastName keys in your json. If you want struct tags take effect, you need to remove space between colon and quote. json:"first_name"
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