Go語言JSON數據相互轉換

目錄

• 結構體轉json
• map轉json
• int轉json
• slice轉json
• json反序列化為結構體
• json反序列化為map

結構體轉json

結構體轉json示例:

package main

import (
	"encoding/json"
	"fmt"
)

//用戶
type User struct {
	UserName string `json:"username"`
	NickName string `json:"nickname"`
	Age 	 int    `json:"age"`
	Birthday string `json:"birthday"`
	Sex      string `json:"sex"`
	Email    string `json:"email"`
	Phone    string `json:"phone"`
}

//結構體轉JSON
func structToJSON() {

	user := User{
		UserName: "itbsl",
		NickName: "jack",
		Age:   	  18,
		Birthday: "2001-08-15",
		Sex:      "[e-mail]",
		Phone:    "176XXXX6688",
	}

	data, err := json.Marshal(user)

	if err != nil {
		fmt.Println("json.marshal failed, err:", err)
		return
	}

	fmt.Printf("%s\n", string(data))
}

func main() {

	structToJSON()

}

輸出結果：

{"username":"itbsl","nickname":"jack","age":18,"birthday":"2001-08-15","sex":"[e-mail]","email":"","phone":"176XXXX6688"}

map轉json

map轉json示例:

package main

import (
	"encoding/json"
	"fmt"
)

//map轉json
func mapToJSON(tempMap *map[string]interface{}) string {

	data, err := json.Marshal(tempMap)

	if err != nil {
		panic(err)
	}

	return string(data)
}

func main() {

	tempMap := make(map[string]interface{})

	tempMap["username"] = "itbsl"
	tempMap["age"] = 18
	tempMap["sex"] = "male"

	str := mapToJSON(&tempMap)

	fmt.Println(str)

}

輸出結果:

{"age":18,"sex":"male","username":"itbsl"}

int轉json

int轉json

package main

import (
	"encoding/json"
	"fmt"
)

func testInt() {
	var age = 100
	data, err := json.Marshal(age)
	if err != nil {
		fmt.Printf("json.marshal failed, err:", err)
		return
	}

	fmt.Printf("%s\n", string(data))
}

func main() {
	testInt()
}

輸出結果:

100

slice轉json

slice轉json

package main

import (
	"encoding/json"
	"fmt"
)

//slice轉json
func sliceToJSON(s []map[string]interface{}) string {

	data, err := json.Marshal(s)

	if err != nil {
		panic(err)
	}

	return string(data)

}

func main() {

	var s []map[string]interface{}

	tempMap := make(map[string]interface{})

	tempMap["username"] = "itbsl"
	tempMap["age"] = 18
	tempMap["sex"] = "male"

	s = append(s, tempMap)

	tempMap = make(map[string]interface{})

	tempMap["username"] = "jane"
	tempMap["age"] = 23
	tempMap["sex"] = "female"

	s = append(s, tempMap)

	str := sliceToJSON(s)

	fmt.Println(str)
}

輸出結果:

[{"age":18,"sex":"male","username":"itbsl"},{"age":23,"sex":"female","username":"jane"}]

json反序列化為結構體

json轉結構體:

package main

import (
	"encoding/json"
	"fmt"
)

//用戶
type User struct {
	UserName string `json:"username"`
	NickName string `json:"nickname"`
	Age 	 int    `json:"age"`
	Birthday string `json:"birthday"`
	Sex      string `json:"sex"`
	Email    string `json:"email"`
	Phone    string `json:"phone"`
}

//結構體轉JSON
func structToJSON() string {

	user := User{
		UserName: "itbsl",
		NickName: "jack",
		Age:   	  18,
		Birthday: "2001-08-15",
		Sex:      "[e-mail]",
		Phone:    "176XXXX6688",
	}

	data, err := json.Marshal(user)

	if err != nil {
		fmt.Println("json.marshal failed, err:", err)
		return ""
	}

	return string(data)
}

//json轉結構體
func JSONToStruct(str string) {

	var user User

	err := json.Unmarshal([]byte(str), &user)

	if err != nil {

		panic(err)
	}

	fmt.Println(user)

}

func main() {

	JSONToStruct(structToJSON())
}

輸出結果:

{itbsl jack 18 2001-08-15 [e-mail]  176XXXX6688}

json反序列化為map

json轉map

package main

import (
	"encoding/json"
	"fmt"
)

//map轉json
func mapToJSON(tempMap *map[string]interface{}) string {

	data, err := json.Marshal(tempMap)

	if err != nil {
		panic(err)
	}

	return string(data)
}

func JSONToMap(str string) {

	var tempMap map[string]interface{}

	err := json.Unmarshal([]byte(str), &tempMap)

	if err != nil {
		panic(err)
	}

	fmt.Println(tempMap)

}

func main() {

	tempMap := make(map[string]interface{})

	tempMap["username"] = "itbsl"
	tempMap["age"] = 18
	tempMap["sex"] = "male"

	str := mapToJSON(&tempMap)

	JSONToMap(str)
}

輸出結果:

map[age:18 sex:male username:itbsl]