go 序列化

 

序列化

package main

import (
    "encoding/json"
    "fmt"
)

//结构体
type Monster struct {
    Name string
    Age int
    Birthday string
    Sal float64
    Skill string
}

//结构体 增加tag标签
type Monster2 struct {
    Name string `json:"monster"`//反射机制
    Age int   `json:"age"`
    Birthday string `json:"birthday"`
    Sal float64 `json:"sal"`
    Skill string `json:"skill"`
}
//结构体序列化
func testStruct(){
    monster:=Monster{
        Name:     "牛魔王",
        Age:      500,
        Birthday: "2011-11-11",
        Sal:      18222,
        Skill:    "牛魔圈",
    }
    //序列化
    data,err:=json.Marshal(&monster)
    if err!=nil{
        fmt.Printf("序列化错误 err=%v
",err)
    }
    fmt.Printf("monster 序列化后=%v
",string(data))

}

//结构体序列化 增加tag,字段自定义
func testStruct2(){
    monster:=Monster2{
        Name:     "牛魔王",
        Age:      500,
        Birthday: "2011-11-11",
        Sal:      18222,
        Skill:    "牛魔圈",
    }
    //序列化
    data,err:=json.Marshal(&monster)
    if err!=nil{
        fmt.Printf("序列化错误 err=%v
",err)
    }
    fmt.Printf("monster 序列化后=%v
",string(data))

}
//map序列化
func testMap(){
    var a map[string]interface{}
    a=make(map[string]interface{})
    a["name"]="红孩儿"
    a["age"]=30
    a["address"]="火云洞"
    //序列化
    data,err:=json.Marshal(a)
    if err!=nil{
        fmt.Printf("序列化错误 err=%v
",err)
    }

    fmt.Printf("a map序列化后=%v
",string(data))
}
//切片序列化
func testSlice(){
    var slice []map[string]interface{}
    var m1 map[string]interface{}
    m1=make(map[string]interface{})
    m1["name"]="jack"
    m1["age"]="7"
    m1["address"]="北京"
    slice=append(slice,m1)

    var m2 map[string]interface{}
    m2=make(map[string]interface{})
    m2["name"]="tom"
    m2["age"]="20"
    m2["address"]=[2]string{"墨西哥","夏威夷"}
    slice=append(slice,m2)
    data,err:=json.Marshal(slice)
    if err!=nil{
        fmt.Printf("序列化错误 err=%v
",err)
    }
    fmt.Printf("slice 序列化后=%v
",string(data))
}


//对基本数据类型序列化意义不大
func testFloat64(){
    var num1 float64 =123456.45
    data,err:=json.Marshal(num1)
    if err!=nil{
        fmt.Printf("序列化错误 err=%v
",err)
    }
    fmt.Printf("float64 序列化后=%v
",string(data))
}

func main() {

//testStruct()
//testMap()
//testSlice()
//testFloat64()
testStruct2()
}

反序列化

package main

import (
    "encoding/json"
    "fmt"
)

type Monster struct {
    Name     string
    Age      int
    Birthday string
    Sal      float64
    Skill    string
}

//演示将json字符串，反序列化成struct
func unmarshalStruct() {
    str := "{"Name":"牛魔王","Age":500,"Birthday":"2011-11-11","Sal":18222,"Skill":"牛魔圈"}"

    var monster Monster
    err := json.Unmarshal([]byte(str), &monster)
    if err != nil {
        fmt.Printf("unmarshal err=%v
", err)
    }
    fmt.Printf("反序列化后 monster=%v monster.Name=%v 
", monster, monster.Name)
}

//将json字符串，反序列化成map
func unmarshaMap() {
    str := "{"address":"火云洞","age":30,"name":"红孩儿"}"
    var a map[string]interface{}
    //反序列化
    //注意，反序列化不需要make,因为mak被封装到Unmarshal函数
    err := json.Unmarshal([]byte(str), &a)
    if err != nil {
        fmt.Printf("unmarshal err=%v
", err)
    }
    fmt.Printf("反序列化 a=%v
", a)
}

//将json字符串，反序列化成切片
func unmarshalSlice() {
    str := "[{"address":"北京","age":"7","name":"jack"},{"address":["墨西哥","夏威夷"],"age":"20","name":"tom"}]"
    //定义一个slice
    var slice []map[string]interface{}
    //反序列化，不需要make,因为make操作被封装到Unmarshal函数
    err := json.Unmarshal([]byte(str), &slice)
    if err != nil {
        fmt.Printf("unmarshal err=%v 
", err)
    }
    fmt.Printf("反序列化后slice=%v
", slice)
}
/*
总结
1.反序列化json字符串，前后数据类型必须一致
2.如果json是通过程序获取的，则不需要手动转义

*/
func main() {
    //unmarshalStruct()
    //unmarshaMap()
    unmarshalSlice()
}