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)
}