如何在golang中解析JSON？

I tried to "Unmarshal" json in golang, but it doesn't seem to be working. I get 0 printed out instead of 1. What am I doing wrong?

package main

import (
  "fmt"
  "encoding/json"
)

type MyTypeA struct {
  a int
}

func main() {
  var smthng MyTypeA
  jsonByteArray := []byte(`{"a": 1}`)
  json.Unmarshal(jsonByteArray, &smthng)
  fmt.Println(smthng.a)
}

Two problems with your code.

1. You need to export fields or Marshal won't work, read about it here.
2. Your package must be called main or func main won't be executed.

http://play.golang.org/p/lJixko1QML

type MyTypeA struct {
    A int
}

func main() {
    var smthng MyTypeA
    jsonByteArray := []byte(`{"a": 1}`)
    json.Unmarshal(jsonByteArray, &smthng)
    fmt.Println(smthng.A)
}