我试图在 golang 中使用美国今天的 RESTful api 编写一个小应用程序，但在尝试解析来自 api 的 GET 请求时，我似乎在类型转换中遇到错误。我的程序可以编译，这让我认为类型是正确的，但在运行时我的程序崩溃了

我很清楚如何映射传入的 json，其中您没有使用类型接口(interface) {} 的预制结构 http://blog.golang.org/json-and-go

这是我的 golang 代码的样子:

// get request to API
resp, err := http.Get("http://api.usatoday.com/open/articles/topnews/home?count=10&days=0&page=0&encoding=json&api_key=myApiKey")

if(err == nil){
    body, err := ioutil.ReadAll(resp.Body)
    if(err == nil) {
        var data interface{}
        json.Unmarshal(body, &data)

        var m = data.(map[string] []interface{})            
        var articles = m["stories"]
        var newArticle interface {}

        for newArticle = range articles {
            var n = newArticle.(map[string] string)

            fmt.Printf("<h2>Title: " + n["title"] + "</h2>")
            fmt.Printf("<p>description: " + n["description"] + "</p>")
            fmt.Printf("<p>link to article: " + n["link"] + "</p>")
        }

    } else {
        fmt.Println(err)
    }

} else {
    fmt.Println(err)
}

这是获取请求响应的一个小例子

{
    "stories": [{
        "description": "Despite the fact that shoppers descended upon stores after giving thanks, Black Friday wasn't without its share of brawls.",
        "guid": [{
            "isPermalink": "true",
            "value": "http:\/\/apidata.usatoday.com\/story\/news\/nation-now\/2013\/11\/29\/black-friday-police-violence\/3783467\/?kjnd=Pvzhnh75%2BZ3dnzxHVv571HQOfzKReZECsSPCBGnAiXlbHijpqdc3TQoe4dYfzVlB-8d81f9e3-0b56-421e-a5da-121f9eb83de3_E50GPTZL1%2FYloJsxpxSnp8AhoO2O9prQtDTYiwN3sbV0SfQ5wriH1zooo6XgNPTr"
        }],
        "link": "http:\/\/apidata.usatoday.com\/story\/news\/nation-now\/2013\/11\/29\/black-friday-police-violence\/3783467\/?kjnd=LOCSg6KVoQR3pwnZyGmcgcDZXwce0MwglPkURuQ%2BzMkUdNzQ2GXJr%2FPfLCl4Hf38-8d81f9e3-0b56-421e-a5da-121f9eb83de3_Zp5d44u%2F3U2IkXWRbNP0OwyXjRkEgShxoJC0wp7%2FOJoFPCI979Zw4qgNkWkOG1x1",
        "pubDate": "Fri, 29 Nov 2013 02:57:43 GMT",
        "title": "Black Friday frenzy leads to reports of violence"
    }, {
        "description": "President Obama's law faces hurdles beyond the Supreme Court case on the birth control mandate.",
        "guid": [{
            "isPermalink": "true",
            "value": "http:\/\/apidata.usatoday.com\/story\/news\/politics\/2013\/11\/29\/supreme-court-obamacare-lawsuits-irs\/3760811\/?kjnd=sCqadf244XkWTNcS0zAI%2Ba25XsnxwAX3ahu8NP0bzKdU4Kx31rJsa0cWlhvnwMl8-8d81f9e3-0b56-421e-a5da-121f9eb83de3_wtrtyHNPao7CqrB0IR7%2Bj3GFwJMhSYFSrOrrGZCkX2BStipIyyDtQoTLLFCGoLj0"
        }],
        "link": "http:\/\/apidata.usatoday.com\/story\/news\/politics\/2013\/11\/29\/supreme-court-obamacare-lawsuits-irs\/3760811\/?kjnd=Be2GdDxc2cZdIOPiCpcL9vz%2FFvmT859xSGoVutxwurqJ%2FCwvTt8vjs2s9MHzI1hO-8d81f9e3-0b56-421e-a5da-121f9eb83de3_88mb%2BwbADj1MvtG9%2BiYMhVS43CRGBEVdn0v5QJsORviARUA3qR0iE9LBr7NpNrT7",
        "pubDate": "Fri, 29 Nov 2013 11:12:08 GMT",
        "title": "Long-shot legal challenges to health care law abound"
    }
    }]
}

最后是运行时错误的样子

panic: interface conversion: interface is map[string]interface {}, not map[string][]interface {}

我不太确定我应该如何处理这个问题，所以任何预先知道在 golang 中使用 RESTful api 的人如果有一些洞察力，我们将不胜感激!

最佳答案

我最终使用一些与 json 对象匹配的结构修复了它……这有点痛苦。

这里是如果有人想在 golang 中使用这个 api

type stories struct {
    Stories []story
}
type story struct {
    Description string
    Guid []guid
    Link string
    PubDate string
    Title string
}
type guid struct {
    IsPermalink string
    Value string
}

关于json - golang GET请求运行时json类型错误，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/20293977/