golang -- 序列化 msgpack & json

第一次,站长亲自招 Gopher 了>>>

下面总结一下go的序列化,通信中常用的格式:msgpack和json

msgpack
安装:
go get go get github.com/vmihailenco/msgpack
go install github.com/vmihailenco/msgpack
api:http://godoc.org/github.com/vmihailenco/msgpack

func ExampleEncode() {
 b, err := msgpack.Marshal(true)
 fmt.Printf("%v %#v\n", err, b)
 // Output: <nil> []byte{0xc3}
}
func ExampleDecode() {
 var out bool
 err := msgpack.Unmarshal([]byte{0xc3}, &out)
 fmt.Println(err, out)
 // Output: <nil> true
}
func ExampleMapStringInterface() {
 in := map[string]interface{}{"foo": uint32(123456789), "hello": "world"}
 b, err := msgpack.Marshal(in)
 _ = err
 var out map[string]interface{}
 err = msgpack.Unmarshal(b, &out)
 fmt.Printf("%v %#v\n", err, out)
 // Output: <nil> map[string]interface {}{"foo":0xfecaefbe, "hello":"world"}
}
func ExampleRecursiveMapStringInterface() {
 buf := &bytes.Buffer{}
 enc := msgpack.NewEncoder(buf)
 in := map[string]interface{}{"foo": map[string]interface{}{"hello": "world"}}
 _ = enc.Encode(in)
 dec := msgpack.NewDecoder(buf)
 dec.DecodeMapFunc = func(d *msgpack.Decoder) (interface{}, error) {
 n, err := d.DecodeMapLen()
 if err != nil {
 return nil, err
 }
 m := make(map[string]interface{}, n)
 for i := 0; i < n; i++ {
 mk, err := d.DecodeString()
 if err != nil {
 return nil, err
 }
 mv, err := d.DecodeInterface()
 if err != nil {
 return nil, err
 }
 m[mk] = mv
 }
 return m, nil
 }
 out, err := dec.DecodeInterface()
 fmt.Printf("%v %#v\n", err, out)
 // Output: <nil> map[string]interface {}{"foo":map[string]interface {}{"hello":"world"}}
}

在网络流中:

buf := &bytes.Buffer{}
buf.Write([]byte{164, 97, 98, 99, 100})
buf.Write([]byte{164, 97, 98, 99, 100})
dec := msgpack.NewDecoder(buf)
for {
 out, err := dec.DecodeBytes()
 if err != nil {
 break
 }
 fmt.Printf("%v %#v\n", err, string(out))
}

json
-->loads:
1把json串解析到结构体

//-----------------json loads----------------
// 把json串解析到结构体
package main
import (
 "fmt"
 "encoding/json"
)
func main(){
 type carinfo struct {
 Id string
 License string
 Color int
 Device string // "<设备类型>.<设备id>"
 }
 
 type carlist struct {
 Result int
 Message string
 Cars []carinfo
 }
 
 var msg carlist
 json_str := `{"result":0, "message":"ok", "cars":[{"id":"311111", "license":"豫A1111", "color":2, "device":"VA3K.10001"}, {"id":"311112", "license":"豫A1112", "color":2, "device":"VA3K.10002"}]}`
 err := json.Unmarshal([]byte(json_str), &msg)
 if err != nil {
 fmt.Println("json loads err:", err)
 }
 fmt.Println(msg)
}
# {0 ok [{豫311111 A1111 2 VA3K.10001} {311112 豫A1112 2 VA3K.10002}]}

**结构体首字母要大写, 并且和json串要对应
2把json串解析到interface

func main(){
	json_str := `{"result":0, "message":"ok", "cars":[{"id":"豫311111", "license":"A1111", "color":2, "device":"VA3K.10001"}, {"id":"311112", "license":"豫A1112", "color":2, "device":"VA3K.10002"}]}`
	var msg map[string]interface{}
	err := json.Unmarshal([]byte(json_str), &msg)
	if err == nil{
		fmt.Println(msg)
	}
}
# map[result:0 message:ok cars:[map[id:豫311111 license:A1111 color:2 device:VA3K.10001] map[id:311112 license:豫A1112 color:2 device:VA3K.10002]]]

-->dumps:
1
直接

b := []byte(`{"Name":"Alice","Body":"Hello","Time":1294706395881547000}`)

这样就行了, 就可以用Unmarshal解析了
2使用Marshal

type Message struct {
 Name string
 Body string
 Time int64
}
m := Message{"Alice", "Hello", 1294706395881547000}
b, err := json.Marshal(m)
# b --> []byte(`{"Name":"Alice","Body":"Hello","Time":1294706395881547000}`)

---

本文来自:开源中国博客

感谢作者:flyking

查看原文:golang -- 序列化 msgpack & json

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