golang ---JSON-ITERATOR 使用

jsoniter （ json-iterator ）是一款快且灵活的 JSON 解析器

Jsoniter 是最快的 JSON 解析器。它最多能比普通的解析器快 10 倍之多,

独特的 iterator api 能够直接遍历 JSON ，极致性能！ 0 内存分配！这样的 iterator 你绝对没有用过

github地址：

https://github.com/json-iterator/go

　　

获取：

go get github.com/json-iterator/go

　　

简单应用Marshal

由

json.Marshal(&data)

到

var json = jsoniter.ConfigCompatibleWithStandardLibrary
json.Marshal(&data)

完整代码：

package main

import (
	"encoding/json"
	"fmt"
	"os"

	"github.com/json-iterator/go"
)

func main() {
	type ColorGroup struct {
		ID     int
		Name   string
		Colors []string
	}
	group := ColorGroup{
		ID:     1,
		Name:   "Reds",
		Colors: []string{"Crimson", "Red", "Ruby", "Maroon"},
	}
	b, err := json.Marshal(group)
	if err != nil {
		fmt.Println("error:", err)
	}
	os.Stdout.Write(b)

	var json_iterator = jsoniter.ConfigCompatibleWithStandardLibrary
	b, err = json_iterator.Marshal(group)
	os.Stdout.Write(b)
}

　　输出： 
{“ID”:1,”Name”:”Reds”,”Colors”:[“Crimson”,”Red”,”Ruby”,”Maroon”]}

{“ID”:1,”Name”:”Reds”,”Colors”:[“Crimson”,”Red”,”Ruby”,”Maroon”]}

简单应用Unmarshal
由

json.Unmarshal(input, &data)

到

var json = jsoniter.ConfigCompatibleWithStandardLibrary
json.Unmarshal(input, &data)

　　

完整代码：

package main

import (
	"encoding/json"
	"fmt"

	"github.com/json-iterator/go"
)

func main() {
	var jsonBlob = []byte(`[
        {"Name": "Platypus", "Order": "Monotremata"},
        {"Name": "Quoll",    "Order": "Dasyuromorphia"}
    ]`)
	type Animal struct {
		Name  string
		Order string
	}
	var animals []Animal
	err := json.Unmarshal(jsonBlob, &animals)
	if err != nil {
		fmt.Println("error:", err)
	}
	fmt.Printf("%+v", animals)

	var animals2 []Animal
	var json_iterator = jsoniter.ConfigCompatibleWithStandardLibrary
	json_iterator.Unmarshal(jsonBlob, &animals2)
	fmt.Printf("%+v", animals2)
}

　　输出：

[{Name:Platypus Order:Monotremata} {Name:Quoll Order:Dasyuromorphia}][{Name:Platypus Order:Monotremata} {Name:Quoll Order:Dasyuromorphia}]

package main

import (
	"fmt"

	"github.com/json-iterator/go"
)

func main() {

	val := []byte(`{"ID":1,"Name":"Reds","Colors":["Crimson","Red","Ruby","Maroon"]}`)
	str := jsoniter.Get(val, "Colors", 0).ToString()
	fmt.Println(str)
}

　　输出：

Crimson

package main

import (
	"fmt"

	"github.com/json-iterator/go"
)

func main() {

	val := []byte(`{"ID":1,"Name":"Reds","Colors":["Crimson","Red","Ruby","Maroon"]}`)
	str := jsoniter.Get(val, "Colors", 1).ToString()
	fmt.Println(str)
}

　　输出：

Red

简单应用NewDecoder

package main

import (
	"fmt"
	"strings"

	"github.com/json-iterator/go"
)

func main() {
	json := jsoniter.ConfigCompatibleWithStandardLibrary
	reader := strings.NewReader(`{"branch":"beta","change_log":"add the rows{10}","channel":"fros","create_time":"2017-06-13 16:39:08","firmware_list":"","md5":"80dee2bf7305bcf179582088e29fd7b9","note":{"CoreServices":{"md5":"d26975c0a8c7369f70ed699f2855cc2e","package_name":"CoreServices","version_code":"76","version_name":"1.0.76"},"FrDaemon":{"md5":"6b1f0626673200bc2157422cd2103f5d","package_name":"FrDaemon","version_code":"390","version_name":"1.0.390"},"FrGallery":{"md5":"90d767f0f31bcd3c1d27281ec979ba65","package_name":"FrGallery","version_code":"349","version_name":"1.0.349"},"FrLocal":{"md5":"f15a215b2c070a80a01f07bde4f219eb","package_name":"FrLocal","version_code":"791","version_name":"1.0.791"}},"pack_region_urls":{"CN":"https://s3.cn-north-1.amazonaws.com.cn/xxx-os/ttt_xxx_android_1.5.3.344.393.zip","default":"http://192.168.8.78/ttt_xxx_android_1.5.3.344.393.zip","local":"http://192.168.8.78/ttt_xxx_android_1.5.3.344.393.zip"},"pack_version":"1.5.3.344.393","pack_version_code":393,"region":"all","release_flag":0,"revision":62,"size":38966875,"status":3}`)
	decoder := json.NewDecoder(reader)
	params := make(map[string]interface{})
	err := decoder.Decode(&params)
	if err != nil {
		fmt.Println(err)
	} else {
		fmt.Printf("%+v
", params)
	}
}

　　输出：

map[channel:fros pack_region_urls:map[CN:https://s3.cn-north-1.amazonaws.com.cn/xxx-os/ttt_xxx_android_1.5.3.344.393.zip default:http://192.168.8.78/ttt_xxx_android_1.5.3.344.393.zip local:http://192.168.8.78/ttt_xxx_android_1.5.3.344.393.zip] size:3.8966875e+07 status:3 change_log:add the rows{10} create_time:2017-06-13 16:39:08 firmware_list: region:all release_flag:0 revision:62 md5:80dee2bf7305bcf179582088e29fd7b9 note:map[CoreServices:map[md5:d26975c0a8c7369f70ed699f2855cc2e package_name:CoreServices version_code:76 version_name:1.0.76] FrDaemon:map[md5:6b1f0626673200bc2157422cd2103f5d package_name:FrDaemon version_code:390 version_name:1.0.390] FrGallery:map[md5:90d767f0f31bcd3c1d27281ec979ba65 package_name:FrGallery version_code:349 version_name:1.0.349] FrLocal:map[package_name:FrLocal version_code:791 version_name:1.0.791 md5:f15a215b2c070a80a01f07bde4f219eb]] pack_version:1.5.3.344.393 branch:beta pack_version_code:393]