ackage main

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

type ConfigStruct struct {
	Host              string   `json:"host"`
	Port              int      `json:"port"`
	AnalyticsFile     string   `json:"analytics_file"`
	StaticFileVersion int      `json:"static_file_version"`
	StaticDir         string   `json:"static_dir"`
	TemplatesDir      string   `json:"templates_dir"`
	SerTcpSocketHost  string   `json:"serTcpSocketHost"`
	SerTcpSocketPort  int      `json:"serTcpSocketPort"`
	Fruits            []string `json:"fruits"`
}

type Other struct {
	SerTcpSocketHost string   `json:"serTcpSocketHost"`
	SerTcpSocketPort int      `json:"serTcpSocketPort"`
	Fruits           []string `json:"fruits"`
}

func main() {	
	jsonStr := `{"host": "http://localhost:9090","port": 9090,"analytics_file": "","static_file_version": 1,"static_dir": "E:/Project/goTest/src/","templates_dir": "E:/Project/goTest/src/templates/","serTcpSocketHost": ":12340","serTcpSocketPort": 12340,"fruits": ["apple", "peach"]}`

	//json str 转map
	var dat map[string]interface{}
	if err := json.Unmarshal([]byte(jsonStr), &dat); err == nil {
		fmt.Println("==============json str 转map=======================")
		fmt.Println(dat)
		fmt.Println(dat["host"])
	}

	//json str 转struct
	var config ConfigStruct
	if err := json.Unmarshal([]byte(jsonStr), &config); err == nil {
		fmt.Println("================json str 转struct==")
		fmt.Println(config)
		fmt.Println(config.Host)
	}

	//json str 转struct(部份字段)
	var part Other
	if err := json.Unmarshal([]byte(jsonStr), &part); err == nil {
		fmt.Println("================json str 转struct==")
		fmt.Println(part)
		fmt.Println(part.SerTcpSocketPort)
	}

	//struct 到json str
	if b, err := json.Marshal(config); err == nil {
		fmt.Println("================struct 到json str==")
		fmt.Println(string(b))
	}

	//map 到json str
	fmt.Println("================map 到json str=====================")
	enc := json.NewEncoder(os.Stdout)
	enc.Encode(dat)

	//array 到 json str
	arr := []string{"hello", "apple", "python", "golang", "base", "peach", "pear"}
	lang, err := json.Marshal(arr)
	if err == nil {
		fmt.Println("================array 到 json str==")
		fmt.Println(string(lang))
	}

	//json 到 []string
	var wo []string
	if err := json.Unmarshal(lang, &wo); err == nil {
		fmt.Println("================json 到 []string==")
		fmt.Println(wo)
	}
}