Golang 超快JSON 解析

🕘 Mon, 27 Feb 2017 by GolangNote

Golang 超快JSON 解析，基于 github.com/json-iterator/go

package main

import (
	"fmt"
	"reflect"
	"unsafe"

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

type StructOfTag struct {
	field1 string `json:"field-1"`
	field2 string `json:"-"`
	field3 int    `json:",string"`
}

func str2byte(s string) []byte {
	x := (*[2]uintptr)(unsafe.Pointer(&s))
	h := [3]uintptr{x[0], x[1], x[1]}
	return *(*[]byte)(unsafe.Pointer(&h))
}
func byte2str(b []byte) string {
	return *(*string)(unsafe.Pointer(&b))
}

func b2s(b []byte) string {
	return *(*string)(unsafe.Pointer(&b))
}

// s2b converts string to a byte slice without memory allocation.
//
// Note it may break if string and/or slice header will change
// in the future go versions.
func s2b(s string) []byte {
	sh := (*reflect.StringHeader)(unsafe.Pointer(&s))
	bh := reflect.SliceHeader{
		Data: sh.Data,
		Len:  sh.Len,
		Cap:  sh.Len,
	}
	return *(*[]byte)(unsafe.Pointer(&bh))
}

func main() {

	struct_ := StructOfTag{}
	//jsoniter.Unmarshal([]byte(`{"field-1": "hello", "field2": "", "field3": "100"}`), &struct_)
	jsoniter.Unmarshal(s2b(`{"field-1": "hello", "field2": "", "field3": "100"}`), &struct_)

	fmt.Println(struct_)

}

输出：

{hello  100}

Golang 超快JSON 解析

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