go語言之進階篇json解析到結構體

1、json解析到結構體

示例：

package main

import (
	"encoding/json"
	"fmt"
)

type IT struct {
	Company  string   `json:"company"`
	Subjects []string `json:"subjects"` //二次編碼
	IsOk     bool     `json:"isok"`
	Price    float64  `json:"price"`
}

func main() {

	jsonBuf := `
	{
    "company": "itcast",
    "subjects": [
        "Go",
        "C++",
        "Python",
        "Test"
    ],
    "isok": true,
    "price": 666.666
}`

	var tmp IT                                   //定義一個結構體變量
	err := json.Unmarshal([]byte(jsonBuf), &tmp) //第二個參數要地址傳遞
	if err != nil {
		fmt.Println("err = ", err)
		return
	}
	//fmt.Println("tmp = ", tmp)
	fmt.Printf("tmp = %+v\n", tmp)
}

執行結果：

tmp = {Company:itcast Subjects:[Go C++ Python Test] IsOk:true Price:666.666}

　　

示例2： 定義結構體，解析你想生成的字段

package main

import (
	"encoding/json"
	"fmt"
)

type IT struct {
	Company  string   `json:"company"`
	Subjects []string `json:"subjects"` //二次編碼
	IsOk     bool     `json:"isok"`
	Price    float64  `json:"price"`
}

func main() {

	jsonBuf := `
	{
    "company": "itcast",
    "subjects": [
        "Go",
        "C++",
        "Python",
        "Test"
    ],
    "isok": true,
    "price": 666.666
}`

	var tmp IT                                   //定義一個結構體變量
	err := json.Unmarshal([]byte(jsonBuf), &tmp) //第二個參數要地址傳遞
	if err != nil {
		fmt.Println("err = ", err)
		return
	}

	type IT2 struct {
		Subjects []string `json:"subjects"` //二次編碼
	}

	var tmp2 IT2
	err = json.Unmarshal([]byte(jsonBuf), &tmp2) //第二個參數要地址傳遞
	if err != nil {
		fmt.Println("err = ", err)
		return
	}
	fmt.Printf("tmp2 = %+v\n", tmp2)

}

執行結果：

tmp2 = {Subjects:[Go C++ Python Test]}