golang提供了json处理的标准库encoding/json处理，对于结构体，转为json，属性和结构体必须是公有的。

type Stu struct {
	ID     int      `json:"id"`
	Sex    int      `json:"sex"`
	Name   string   `json:"name"`
	Number string   `json:"number"`
	Hobby  []string `json:"hobby"`
	Addr   Address  `json:"address"`
}
type Address struct {
	AddrName string
	Phone    string
}

结构体转json。

var stu = Stu{
	ID:     1,
	Sex:    2,
	Name:   "小明",
	Number: "N123456",
	Hobby:  []string{"写代码", "足球"},
}
stu.Addr = Address{
	AddrName: "test",
	Phone:    "123456789",
}

//返回的是一个byte类型的切片
stuByte, _ := json.Marshal(stu)
stuJson := string(stuByte)
fmt.Printf("%v\n", stuJson)

json转结构体。

var stuStr = `{"id":1,"sex":2,"name":"小明","number":"N123456","hobby":["写代码","足球"],"address":{"AddrName":"test","Phone":"123456789"}}`
var stuStruct Stu
//应该要修改stuStruct的值，所以需要传入地址
err := json.Unmarshal([]byte(stuStr), &stuStruct)
if err != nil {
	fmt.Printf("%v\n", err)
}
fmt.Printf("%#v\n", stuStruct)

还有一些更方便的json处理库，例如
https://github.com/tidwall/gjson

嵌套json字符串的提取。

var json = `{"name":{"first":"Janet","last":"Prichard"},"age":47}`
last := gjson.Get(json, "name.last")
age := gjson.Get(json, "age")
fmt.Printf("last=%v,last-type=%T\n", last.String(), last.String())
fmt.Printf("age=%v,age-type=%T\n", age.Int(), age.Int())

聚合计算

jsonData := `{
	"products": [
		{"name": "苹果", "money": 11},
		{"name": "香蕉", "money": 1},
		{"name": "橘子", "money": 1},
	]
}`

result := gjson.Get(jsonData, "products.#(money < 2)")
cheapProducts := result.Array()
fmt.Println("便宜的水果:", cheapProducts)