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Golangでjsonを扱う
{
"id" : 1,
"author" : "hogefuga",
"content" : "Hellooooooooo!!",
"comment" : {
"comment_id" : 11,
"message" : "very gooood"
},
"books" : [
{
"book_id" : 23,
"title" : "hogefuga"
},
{
"book_id" : 54,
"title" : "wahahahahaha"
},
{
"book_id" : 76,
"title" : "ohhhnoooo"
}
]
}
package main
import (
"encoding/json"
"fmt"
"io/ioutil"
"os"
)
type Post struct {
Id int `json:"id"`
Author string `json:"author"`
Content string `json:"content"`
Comment Comment `json:"comment"`
Books []Book `json:"books"`
}
type Comment struct {
Comment_id int `json:"comment_id"`
Message string `json:"message"`
}
type Book struct {
Book_id int `json:"book_id"`
Title string `json:"title"`
}
func main() {
// read json
fmt.Println("===== Read json =====")
json_file, err := os.Open("./json_sample.json")
if err != nil {
fmt.Println("Error opening", err)
return
}
defer json_file.Close()
json_data, err := ioutil.ReadAll(json_file)
if err != nil {
fmt.Println("Error reading", err)
return
}
var post_read Post
json.Unmarshal(json_data, &post_read)
fmt.Println(post_read)
fmt.Println(post_read.Comment.Message)
fmt.Println(post_read.Books[2].Title)
// write json
fmt.Println("===== Write json =====")
post_write := Post {
Id : 11111,
Author : "toriyama akira",
Comment : Comment {
Comment_id : 999999,
Message : "sugeeeeeee",
},
Books : []Book {
Book {
Book_id : 1004,
Title : "naushika",
},
Book {
Book_id : 2006,
Title : "akira",
},
Book {
Book_id : 4005,
Title : "inachu",
},
},
}
fmt.Println(post_write)
output, err := json.MarshalIndent(&post_write, "", "\t")
if err != nil {
fmt.Println("Error marshalling", err)
return
}
err = ioutil.WriteFile("json_output.json", output, 0644)
if err != nil {
fmt.Println("Error write file", err)
return
}
}
===== Read json =====
{1 hogefuga Hellooooooooo!! {11 very gooood} [{23 hogefuga} {54 wahahahahaha} {76 ohhhnoooo}]}
very gooood
ohhhnoooo
===== Write json =====
{11111 toriyama akira {999999 sugeeeeeee} [{1004 naushika} {2006 akira} {4005 inachu}]}
{
"id": 11111,
"author": "toriyama akira",
"content": "",
"comment": {
"comment_id": 999999,
"message": "sugeeeeeee"
},
"books": [
{
"book_id": 1004,
"title": "naushika"
},
{
"book_id": 2006,
"title": "akira"
},
{
"book_id": 4005,
"title": "inachu"
}
]
}
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