如何用 Go 解析 Json

Question

有这个代码：

type Foo struct {
  field string
  Value string  

  }

type Guyy struct {
  info Foo
  
  }

func main() {
    GuyJson := `{"info":[{"field":"phone","value":"11111-11111"},{"field":"date","value":"05072001"},{"field":"nationality","value":"american"},{"field":"dni","value":"000012345"}]}`
    var Guy Guyy    
    json.Unmarshal([]byte(GuyJson), &Guy)
    fmt.Printf("%+v", Guy)
}

编译时得到

{info:{field: Value:}}

如何获取国籍的字段和值？

Answer 1

var Guy Guyy
var f interface{}
json.Unmarshal([]byte(GuyJson), &f)

m := f.(map[string]interface{})

foomap := m["info"]
v := foomap.([]interface{})

for _, fi := range v {
    vi := fi.(map[string]interface{})

    var f Foo
    f.Field = vi["field"].(string)
    f.Value = vi["value"].(string)

    if f.Field == "nationality" {
        fmt.Println(f.Field, "was found to be", f.Value)
    }

    Guy.Info = append(Guy.Info, f)
}

fmt.Println(Guy)

Refer this link for complete code -> https://play.golang.org/p/vFgpE0GNJ7K

Answer 2

将结构更改为切片（info 表示结构列表）
你struct field一定是exported (Marshal, Unmarshal, A Tour of GO)

Struct values encode as JSON objects. Each exported struct field becomes a member of the object, using the field name as the object key, unless the field is omitted...

type Guyy struct {
  Info []Foo //  exported slice 
}

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