dq23171 2014-03-02 13:37
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如何检查字符串是否为json格式

I want to create a function to receive an input string which can be string in json format or just a string. For example, something easy like following function.

func checkJson(input string){
   if ... input is in json ... {
      fmt.Println("it's json!")
   } else {
      fmt.Println("it's normal string!")
   }
}
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  • dongpan1416 2014-03-02 15:21
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    I was unclear if you needed to know about just a "quoted string" or if you needed to know about json, or the difference between both of them, so this shows you how to detect both scenarios so you can be very specific.

    I posted the interactive code sample here as well: http://play.golang.org/p/VmT0BVBJZ7

    package main
    
    import (
        "encoding/json"
        "fmt"
    )
    
    func isJSONString(s string) bool {
        var js string
        return json.Unmarshal([]byte(s), &js) == nil
    
    }
    
    func isJSON(s string) bool {
        var js map[string]interface{}
        return json.Unmarshal([]byte(s), &js) == nil
    
    }
    
    func main() {
        var tests = []string{
            `"Platypus"`,
            `Platypus`,
            `{"id":"1"}`,
        }
    
        for _, t := range tests {
            fmt.Printf("isJSONString(%s) = %v
    ", t, isJSONString(t))
            fmt.Printf("isJSON(%s) = %v
    
    ", t, isJSON(t))
        }
    
    }
    

    Which will output this:

    isJSONString("Platypus") = true
    isJSON("Platypus") = false
    
    isJSONString(Platypus) = false
    isJSON(Platypus) = false
    
    isJSONString({"id":"1"}) = false
    isJSON({"id":"1"}) = true
    
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
    评论
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