doulu2591
2014-01-01 21:48
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如何通过Go语言中的url获取JSON对象?

I'm starting to learn Golang and I would like to know how to get a json response by calling an url, if you could give me an example it would be great in order to guide myself.

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我开始学习Golang,我想知道如何通过调用url获得json响应, 如果您能给我一个例子,那么对自己进行指导会很棒。

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  • douxing8939 2014-01-03 13:24
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    I'd write a little helper function to do it:

    // getJSON fetches the contents of the given URL
    // and decodes it as JSON into the given result,
    // which should be a pointer to the expected data.
    func getJSON(url string, result interface{}) error {
        resp, err := http.Get(url)
        if err != nil {
            return fmt.Errorf("cannot fetch URL %q: %v", url, err)
        }
        defer resp.Body.Close()
        if resp.StatusCode != http.StatusOK {
            return fmt.Errorf("unexpected http GET status: %s", resp.Status)
        }
        // We could check the resulting content type
        // here if desired.
        err := json.NewDecoder(resp.Body).Decode(result)
        if err != nil {
            return fmt.Errorf("cannot decode JSON: %v", err)
        }
        return nil
    }
    

    A full working example can be found here: http://play.golang.org/p/b1WJb7MbQV

    Note that it is important to check the status code as well as the Get error, and the response body must be closed explicitly (see the documentation here: http://golang.org/pkg/net/http/#Get)

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