golang生成JSON以及解析JSON

"name" : "value"

{ "age":30 }

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

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

{ "flag":true }

{ "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)
}

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)
    }
}

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))
}