go语言json序列化

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我们知道 API 格式一般以 json 格式居式，所以说下json的序列化和反序列化的使用

# json序列化和反序列化

golang标准库encoding/json是用来处理json数据的

package main
import (
	"encoding/json"
	"fmt"
 )
type Result struct {
	Code int `json:"code"`
	Message string `json:"this i message"`
}
type ColorGroup struct {
     ID     int
     Name   string
     Colors []string
}
func main() {
	var res Result
	res.Code = 200
	res.Message = "成功了"

	// 序列化
	jsons, err := json.Marshal(res)
	if err != nil {
		fmt.Println("json marshal error:", err)
	}
	fmt.Println("示例一：json data:", string(jsons))
	fmt.Println("++++++++++++++++")

	// 序列化
    group := ColorGroup{
        ID:     1,
        Name:   "Reds",
        Colors: []string{"Crimson", "Red", "Ruby", "Maroon"},
    }
    b, err := json.Marshal(group)
    if err != nil {
        fmt.Println("error:", err)
    }
    fmt.Println("示例二：json data:", string(b[:]))
    fmt.Println("++++++++++++++++")

	// 反序列化
	var res2 Result
	err = json.Unmarshal(jsons, &res2)
	if err != nil {
		fmt.Println("json unmarshal error:", err)
	}
	fmt.Println("示例一：unjson data:",res2)
	fmt.Println("++++++++++++++++")

	// 反序列化
    var jsonBlob = []byte(`[
        {"ID":1,"Name":"Reds1","Colors":["Crimson","Red1","Ruby1","Maroon1"]},
        {"ID":2,"Name":"Reds2","Colors":["Crimson","Red2","Ruby2","Maroon2"]},
        {"ID":3,"Name":"Reds3","Colors":["Crimson","Red3","Ruby3","Maroon3"]}
    ]`)
    var animals []ColorGroup
    error := json.Unmarshal(jsonBlob, &animals)
    if error != nil {
        fmt.Println("error:", error)
    }
    fmt.Println("示例二：unjson data:", animals)
    fmt.Println("++++++++++++++++")
    for i, x := range animals {
        fmt.Println("示例二：unjson data:", i, x)
    }
    
    // 序列化Map和反序列化Map
	fmt.Println("")
    fmt.Println("序列化Map和反序列化Map")
    r := make(map[string]interface{})
	r["code"] = 200
	r["msg"]  = "success"
	r["data"] = map[string]interface{}{
		"username" : "Tom",
		"age"      : "30",
		"hobby"    : []string{"读书","爬山"},
	}
	fmt.Println("原始Map data :", r)

	//序列化
	jsons, errs := json.Marshal(r)
	if errs != nil {
		fmt.Println("序列化Map marshal error:", errs)
	}
	fmt.Println("--- map to json ---")
	fmt.Println("序列化Map json data :", string(jsons))

	//反序列化
	r2 := make(map[string]interface{})
	errs = json.Unmarshal([]byte(jsons), &r2)
	if errs != nil {
		fmt.Println("反序列化Map json marshal error:", errs)
	}
	fmt.Println("--- json to map ---")
	fmt.Println("序列化Map data :", r2)
}
运行结果：
C:\Go\www>go run dengyu.go
示例一：json data: {"code":200,"this i message":"成功了"}
++++++++++++++++
示例二：json data: {"ID":1,"Name":"Reds","Colors":["Crimson","Red","Ruby","Maroo
n"]}
++++++++++++++++
示例一：unjson data: {200 成功了}
++++++++++++++++
示例二：unjson data: [{1 Reds1 [Crimson Red1 Ruby1 Maroon1]} {2 Reds2 [Crimson R
ed2 Ruby2 Maroon2]} {3 Reds3 [Crimson Red3 Ruby3 Maroon3]}]
++++++++++++++++
示例二：unjson data: 0 {1 Reds1 [Crimson Red1 Ruby1 Maroon1]}
示例二：unjson data: 1 {2 Reds2 [Crimson Red2 Ruby2 Maroon2]}
示例二：unjson data: 2 {3 Reds3 [Crimson Red3 Ruby3 Maroon3]}

序列化Map和反序列化Map
原始Map data : map[code:200 data:map[age:30 hobby:[读书 爬山] username:Tom] msg:
success]
--- map to json ---
序列化Map json data : {"code":200,"data":{"age":"30","hobby":["读书","爬山"],"us
ername":"Tom"},"msg":"success"}
--- json to map ---
序列化Map data : map[code:200 data:map[age:30 hobby:[读书 爬山] username:Tom] ms
g:success]

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