go语言中json处理方式详解

func main() {
  mm := map[string]interface{}{
    "name": "uccs",
    "age":  12,
    "extra": map[string]interface{}{
      "phone": "12345678910",
    },
  }
  bytes, _ := json.Marshal(mm)
  fmt.Println(string(bytes))
}

json.MarshalIndent(mm, "", "  ")

type Person struct {
  Name  *string `json:"name,omitempty"`
  Email *string `json:"email,omitempty"`
}
email := ""
p := Person{
  Email: &email,
}

func main() {
  j := `{
    "name": "uccs",
    "age": 18,
    "email": "",
    "phone": "2222"
  }`
  var p Person
  _ := json.Unmarshal([]byte(j), &p)
  fmt.Println(p)
}

type Person struct {
  Name  string  `json:"name"`
  Age   int     `json:"age"`
  Email *string `json:"email"`
  Phone string  `json:"phone"`
}
j := `{
  "name": "uccs",
  "age": 18,
  "phone": "2222"
}`
k := `{
  "name": "uccs",
  "age": 18,
  "email": "",
  "phone": "2222"
}`
var p1 Person
var p2 Person
_ := json.Unmarshal([]byte(j), &p1)
_ := json.Unmarshal([]byte(k), &p2)
fmt.Println(p1)  // {uccs 18 <nil> 2222}
fmt.Println(p2)  // {uccs 18 0xc000014140 2222}

fmt.Println(p1.Email == nil)  // Email 是否为 nil 判断是否传递了 Email 字段

func main() {
  p := Person{
    Name: "xiaoming",
    Age:  543251,
  }
  file, _ := os.Create("person.json")
  defer file.Close()
  encoder := json.NewEncoder(file)
  encoder.SetEscapeHTML(true) // 转义 json 中的特殊字符
  encoder.Encode(p)
}

func main() {
  file, _ := os.Open("person.json")
  defer file.Close()
  decoder := json.NewDecoder(file)
  p := Person{}
  decoder.Decode(&p)
  fmt.Println(p)
}