go杂货铺

Posted 2020-11-17 hongpeng0209

json序列化

内存中变成可存储或传输的过程称之为序列化(dict,split,struct转string)

package main

import (
	"encoding/json"
	"fmt"
)

type Stu struct {
	Name string
	Age  int
}

func JsonDump() (ret string, err error) {
	stu1 := Stu{
		Name: "somebody",
		Age:  20,
	}
	data, err := json.Marshal(stu1)
	if err != nil {
		err = fmt.Errorf("json dump failed:", err)
		return
	}
	ret = string(data)
	fmt.Println(ret)
	return
}

func main() {
	JsonDump()
}

　　

json反序列化

磁盘读取到内存

需要先定义一个存储的数据类型(map struct)，string要转成byte

package main

import (
	"encoding/json"
	"fmt"
)

type Stu struct {
	Name string
	Age  int
}

func JsonDump() (ret string, err error) {
	stu1 := Stu{
		Name: "somebody",
		Age:  20,
	}
	data, err := json.Marshal(stu1)
	if err != nil {
		err = fmt.Errorf("json dump failed:", err)
		return
	}
	ret = string(data)
	return
}

func JsonLoad(res string) (ret interface{}, err error) {
	var stu Stu
	err = json.Unmarshal([]byte(res), &stu)
	if err != nil {
		err = fmt.Errorf("json loads failed:", err)
		return
	}
	ret = stu
	return
}

func main() {
	response, _ := JsonDump()
	res, _ := JsonLoad(response)
	fmt.Println(res)
}

　　

命令行参数的解析

flag模块

package main

import (
	"flag"
	"fmt"
)

func main() {
	var confPath string
	var command string
	var port int

	flag.StringVar(&confPath, "c", "conf", "conf file of app")//变量名　　-c   默认值　　描述
	flag.StringVar(&command, "a", "online", "command to execute")
	flag.IntVar(&port, "p", 10000, "port of service")
	flag.Parse()

	fmt.Println(confPath)
	fmt.Println(command)
	fmt.Println(port)
}