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Golang中生成JSON及解析JSON


一、JSON解析到结构体

1.JSON名称/值对

"name" : "value"

2.JSON值
可以是:

数字(整数或浮点数)
字符串(在双引号中)
逻辑值(true 或 false)
数组(在中括号中)
对象(在大括号中)
null

JSON数据
JSON 数字可以是整型或者浮点型

{ "age":30 }

JSON对象
JSON 对象在大括号({})中书写:
对象可以包含多个名称/值对:

{
"name": "runoob",
"alexa": 10000,
"sites": {
"site1": "www.runoob.com",
"site2": "m.runoob.com",
"site3": "c.runoob.com"
}
}

JSON数组
JSON 数组在中括号中书写:
数组可包含多个对象:

{
"sites": [
{
"name": "菜鸟教程",
"url": "www.runoob.com"
},
{
"name": "google",
"url": "www.google.com"
},
{
"name": "微博",
"url": "www.weibo.com"
}
]
}

JSON布尔值

{ "flag":true }

JSON null

{ "runoob":null }

Json解析到结构体

//JSON解析到结构体

package main
import (
"encoding/json"
"fmt"
"os"
)
type Server struct {
ServerName string
ServerIP string
}
type Serverslice struct {
Servers []Server
}
func main() {
var s Serverslice
str := `{"servers":
[{"serverName":"Guangzhou_Base","serverIP":"127.0.0.1"},
{"serverName":"Beijing_Base","serverIP":"127.0.0.2"}]}`
err:=json.Unmarshal([]byte(str), &s)
if err!=nil{
fmt.Println(err)
}
fmt.Println(s)
fmt.Println(s.Servers[0].ServerName)
}

二、JSON转map

package main


import (
"fmt"
"encoding/json"
)

func main() {

b := []byte(`{"IP": "127.0.0.1", "name": "SKY"}`)

m := make(map[string]string)

err := json.Unmarshal(b, &m)
if err != nil {

fmt.Println("Umarshal failed:", err)
return
}


fmt.Println("m:", m)

for k,v :=range m {
fmt.Println(k, ":", v)
}
}

输出结果:

m: map[IP:127.0.0.1 name:SKY]
name : SKY
IP : 127.0.0.1

三、生成JSON

package main
import (
"encoding/json"
"fmt"
)
type Server struct {
ServerName string `json:"serverName,string"`
ServerIP string `json:"serverIP,omitempty"`
}
type Serverslice struct {
Servers []Server `json:"servers"`
}
func main() {
var s Serverslice
s.Servers = append(s.Servers, Server{ServerName: "Guangzhou_Base", ServerIP: "127.0.0.1"})
s.Servers = append(s.Servers, Server{ServerName: "Beijing_Base", ServerIP: "127.0.02"})
b, err := json.Marshal(s)
if err != nil {
fmt.Println("JSON ERR:", err)
}
fmt.Println(string(b))
}

 

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