map[string]interface{} demo

package main

import (
    "encoding/json"
    "fmt"
    "reflect"
)

func demo1() {
    txt := `{"a":1,"b":2,"c":[{"name":"1","group":"2"},{"name":"3","group":"4"}]}`
    var m map[string]interface{}
    if err := json.Unmarshal([]byte(txt), &m); err != nil {
        panic(err)
    }   
    for _, v := range m["c"].([]interface{}) {
        fmt.Println(v)
    }   
}

func demo2() {
    txt := `{"a":1,"b":2,"c":[{"name":"1","group":"2"},{"name":"3","group":"4"}]}`
    var m map[string]interface{}
    if err := json.Unmarshal([]byte(txt), &m); err != nil {
        panic(err)
    }   
    v := reflect.ValueOf(m["c"])
    count := v.Len()
    for i := 0; i < count; i++ {
        fmt.Println(v.Index(i))
    }
}

func demo_all() {
    txt := `{"a":1,"b":2,"c":[{"name":"1","group":"2"},{"name":"3","group":"4"}]}`
    var m map[string]interface{}
    if err := json.Unmarshal([]byte(txt), &m); err != nil {
        panic(err)
    }
    for _, v := range m {
        fmt.Println(v)
    }
}

func main() {
    demo1()
    fmt.Println("====================")
    demo2()
    fmt.Println("====================")
    demo_all()
}

运行结果：

[root@wangjq 333]# go run zzz.go 
map[name:1 group:2]
map[name:3 group:4]
====================
map[group:2 name:1]
map[name:3 group:4]
====================
1
2
[map[name:1 group:2] map[name:3 group:4]]