go語言學習筆記十二 json序列化和反序列化

1 go 內置json標準庫

package main

import (
	"encoding/json"
	"fmt"
)

type User struct {
	// string 序列化輸出時會已string類型輸出
	Id int `json:"id,string"` // 注意點 :和,左右沒有空格
	Name string `json:"name"`
	age int  // 小寫的字段不會序列化
	// omitemepty 如果實例沒有值序列化是爲空值
	Address string `json:"address,omitemepty"`
	// - 序列化會忽略
	Phone int `json:"-"`
}

func main() {
	u := User{
		Id: 111,
		Name: "test",
		age: 1,
		Phone: [phone],
	}
	data, err := json.Marshal(&u)
	if err != nil{
		fmt.Println(1, err)
	}
	// 輸出二進制編碼
	fmt.Println(2, data)
	fmt.Println(3, string(data))
	// 反序列化
	u2 := &User{}
	err2 := json.Unmarshal(data, u2)
	if err2 != nil{
		fmt.Println(4, err)
	}
	fmt.Printf("5, %+v \n", u)
	fmt.Printf("6, %+v \n", *u2)
	u3 := &User{}
	data2 := []byte(`{"id":"111","name":"test","address":""}`)
	err3 := json.Unmarshal(data2, u3)
	if err3 != nil{
		fmt.Println(7, err)
	}
	fmt.Printf("8, %+v \n", *u3)

}

輸出

2 [123 34 105 100 34 58 34 49 49 49 34 44 34 110 97 109 101 34 58 34 116 101 115 116 34 44 34 97 100 100 114 101 115 115 34 58 34 34 125]
3 {"id":"111","name":"test","address":""}
5, {Id:111 Name:test age:1 Address: Phone:[phone]} 
6, {Id:111 Name:test age:0 Address: Phone:0} 
8, {Id:111 Name:test age:0 Address: Phone:0} 

2 高性能的json序列化

增加一行代碼替換內置庫:var json = jsoniter.ConfigCompatibleWithStandardLibrary

package main

import (
	"fmt"
	jsoniter "github.com/json-iterator/go"
)

type User struct {
	// string 序列化輸出時會已string類型輸出
	Id int `json:"id,string"` // 注意點 :和,左右沒有空格
	Name string `json:"name"`
	age int  // 小寫的字段不會序列化
	// omitemepty 如果實例沒有值序列化是爲空值
	Address string `json:"address,omitemepty"`
	// - 序列化會忽略
	Phone int `json:"-"`
}

func main() {
	// 替換內置的json序列化庫
	var json = jsoniter.ConfigCompatibleWithStandardLibrary
	u := User{
		Id: 111,
		Name: "test",
		age: 1,
		Phone: [phone],
	}
	data, err := json.Marshal(&u)
	if err != nil{
		fmt.Println(1, err)
	}
	// 輸出二進制編碼
	fmt.Println(2, data)
	fmt.Println(3, string(data))
	// 反序列化
	u2 := &User{}
	err2 := json.Unmarshal(data, u2)
	if err2 != nil{
		fmt.Println(4, err)
	}
	fmt.Printf("5, %+v \n", u)
	fmt.Printf("6, %+v \n", *u2)
	u3 := &User{}
	data2 := []byte(`{"id":"111","name":"test","address":""}`)
	err3 := json.Unmarshal(data2, u3)
	if err3 != nil{
		fmt.Println(7, err)
	}
	fmt.Printf("8, %+v \n", *u3)

}

輸出

2 [123 34 105 100 34 58 34 49 49 49 34 44 34 110 97 109 101 34 58 34 116 101 115 116 34 44 34 97 100 100 114 101 115 115 34 58 34 34 125]
3 {"id":"111","name":"test","address":""}
5, {Id:111 Name:test age:1 Address: Phone:[phone]} 
6, {Id:111 Name:test age:0 Address: Phone:0} 
8, {Id:111 Name:test age:0 Address: Phone:0}