golang将结构体转换成json，json转换成结构体

1、将结构体转换成json需要用到marshl函数（或者marshlIndent（）函数）。

区别：marshl函数没有将json格式化输出，输出是一个json的字符串。----不利于直接查看json的结构。maeshldent函数

可以将json格式化输出，可阅读性提高了。

2、将json字符串转换成结构体需要用到marshl()函数。

实例如下：

package main

import (

     "log"

     "encoding/json"

     "fmt"

)

type Movie struct {

    Title string

    Year int `json:"released"`

    Color bool `json:"color, omitempty"`

    Actors [] string

}

func main (){

     var movies = []Movie{

        {Title: "Casabanca" , Year: 1942 , Color: false ,

            Actors:[] string { "Humphrey Bogart" , "Ingrid Bergman" }},

        {Title: "Casabanca2" , Year: 1962 , Color: true ,

            Actors:[] string { "Humphrey Paul" }},

    }

     data , err := json. Marshal (movies)

     if err != nil {

        log. Fatalf ( "Json marshaling failed：%s" , err)

    }

    fmt. Printf ( "%s \n " , data)

     var movies2 [] struct {Title string }

     // movies2 := make([]Movie, 10)

     if err3 := json. Unmarshal (data, & movies2); err3 != nil {

        log. Fatalf ( "JSON unmarshling failed: %s" , err)

    }

    fmt. Println ( "*****************" , movies2)

     data2 , err2 := json. MarshalIndent (movies, "" , " " )

     if err2 != nil {

        log. Fatalf ( "Json marshlindent failed：%s" , err)

    }

    fmt. Printf ( "%s \n " , data2)

    

    

}

package main

import (

     "log"

     "encoding/json"

     "fmt"

)

type Movie struct {

    Title string

    Year int `json:"released"`

    Color bool `json:"color, omitempty"`

    Actors [] string

}

func main (){

     var movies = []Movie{

        {Title: "Casabanca" , Year: 1942 , Color: false ,

            Actors:[] string { "Humphrey Bogart" , "Ingrid Bergman" }},

        {Title: "Casabanca2" , Year: 1962 , Color: true ,

            Actors:[] string { "Humphrey Paul" }},

    }

     data , err := json. Marshal (movies)

     if err != nil {

        log. Fatalf ( "Json marshaling failed：%s" , err)

    }

    fmt. Printf ( "%s \n " , data)

     var movies2 [] struct {Title string }

     // movies2 := make([]Movie, 10)

     if err3 := json. Unmarshal (data, & movies2); err3 != nil {

        log. Fatalf ( "JSON unmarshling failed: %s" , err)

    }

    fmt. Println ( "*****************" , movies2)

     data2 , err2 := json. MarshalIndent (movies, "" , " " )

     if err2 != nil {

        log. Fatalf ( "Json marshlindent failed：%s" , err)

    }

    fmt. Printf ( "%s \n " , data2)

    

    

}