golang json encoder

package main

import (

    "fmt"

    "encoding/json"

    "bytes"

)

type Device struct{

    SN string`json:"s"`

    Model string`json:"m,omitempty"`

}

func (d Device) String() string{

    return fmt.Sprintf("serial:%s model:%s", d.SN, d.Model)

}

var m = map[string]interface{}{

"sn": "123456",

"platform": 602,

"force": true,

"location": []string{"paris","beijing"},

"decr": "",

}

func encodeJson(v interface{}) ([]byte, error){

    var buf bytes.Buffer

    encoder := json.NewEncoder(&buf)

    encoder.SetEscapeHTML(false)

    if err := encoder.Encode(v); err != nil{

        return nil, err

    }

    return buf.Bytes(), nil

}

func main() {

    if s, err := json.Marshal(m); err != nil{

        panic(err)

    }else{

        fmt.Println(string(s))

    }

    if b, err := encodeJson(m); err != nil{

        panic(err)

    }else{

    fmt.Println(string(b))

    }

    d := Device{SN:"123456", Model:"http://baidu.com"}

    if ds, err := encodeJson(d); err != nil{

        panic(err)    

    }else{

        fmt.Println(string(ds))

    }

}