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)  
}
//2
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)
}