How golang generates JSON and parses JSON

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1. JSON parsing into structure

Data is separated by commas
Curly brackets save objects
Square brackets save arrays
1.JSON name/value pairs

"name" : "value"

can be:

Number (integer or floating point number)

String (in double quotes)
logical value (true or false)
array (in square brackets)
object (in curly brackets)
null

JSON data
3. JSON numbers can be integers or floating point types
   

{ "age":30 }

JSON object
4. JSON objects are written within braces ({}):
   Objects can contain multiple name/value pairs:
   

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

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JSON array
5. JSON array in Write in brackets:
   The array can contain multiple objects:
   

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

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JSON Boolean value

{ "flag":true }

JSON null

{ "runoob":null }

//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) }

2. Convert JSON to 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) } }

m: map[IP:127.0.0.1 name:SKY]

name : SKY
IP : 127.0.0.1

3. Generate 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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