golang encoding/json

 1 package main
 2 
 3 import (
 4     "bytes"
 5     "encoding/json"
 6     "fmt"
 7 )
 8 
 9 type ColorGroup struct {
10     ID     int
11     Name   string
12     Colors []string
13 }
14 
15 func main() {
16 
17     //---------------Marshal
18     group := ColorGroup{
19         ID:     1,
20         Name:   "Reds",
21         Colors: []string{"Crimson", "Red", "Ruby", "Maroon"},
22     }
23     b, err := json.Marshal(group)
24     if err != nil {
25         fmt.Println("error:", err)
26     }
27     //os.Stdout.Write(b)
28     fmt.Println(string(b[:]))
29 
30     //---------------Unmarshal
31     var jsonBlob = []byte(`[
32             {"ID":1,"Name":"Reds1","Colors":["Crimson","Red1","Ruby1","Maroon1"]},
33             {"ID":2,"Name":"Reds2","Colors":["Crimson","Red2","Ruby2","Maroon2"]},
34             {"ID":3,"Name":"Reds3","Colors":["Crimson","Red3","Ruby3","Maroon3"]}
35         ]`)
36 
37     var animals []ColorGroup
38     error := json.Unmarshal(jsonBlob, &animals)
39     if error != nil {
40         fmt.Println("error:", error)
41     }
42 
43     //fmt.Printf("%+v", animals)
44     //fmt.Println(animals)
45     for i, x := range animals {
46         fmt.Println(i, x)
47 
48     }
49     //---------------Indent
50     dst := new(bytes.Buffer)
51     json.Indent(dst, jsonBlob, "##", "**")
52     fmt.Println(dst)
53 }