目錄
- 遍歷結(jié)構(gòu)體
- 遍歷切片
- 遍歷Ｍap
- Golang json序列化（struct，int，map，slice）
遍歷結(jié)構(gòu)體
如何實(shí)現(xiàn)遍歷結(jié)構(gòu)體字段? 好吧，言歸正傳!舉個(gè)例子：
demo1:
package main
import (
"fmt"
"reflect"
)
type Student struct {
name string
age int
}
func main() {
v := reflect.ValueOf(Student{"喬峰", 29})
count := v.NumField()
for i := 0; i count; i++ {
f := v.Field(i) //字段值
switch f.Kind() {
case reflect.String:
fmt.Println(f.String())
case reflect.Int:
fmt.Println(f.Int())
}
}
}
再舉給栗子：
package main
import (
"fmt"
"reflect"
)
type LanType struct {
s1, s2, s3 string
}
var language interface{} = LanType{"Php", "Go", "Python3"}
func main() {
value := reflect.ValueOf(language)
for i := 0; i value.NumField(); i++ {
fmt.Printf("字段索引 %d: %v\n", i, value.Field(i))
}
}
輸出：
BASIC
字段索引 0: Php
字段索引 1: Go
字段索引 2: Python3
遍歷切片
使用 for range遍歷：
package main
import (
"fmt"
)
func main() {
language := []string{"Php", "Go", "Python3"}
for k, val := range language {
fmt.Printf("切片索引 %d is :%s\n", k, val)
}
}
輸出：
BASIC
切片索引 0 is :Php
切片索引 1 is :Go
切片索引 2 is :Python3
遍歷Ｍap
package main
import (
"fmt"
)
func main() {
language := make(map[string]string)
language["1"] = "Php"
language["2"] = "Go"
language["3"] = "Python3"
language["4"] = "C#"
for key, val := range language {
fmt.Printf("%v=>%v\n", key, val)
}
}
輸出：這里就不貼了，結(jié)果會(huì)隨機(jī)輸出，因?yàn)閙ap遍歷出來結(jié)果是無序的，順序不好控制，也不利于業(yè)務(wù)邏輯;當(dāng)業(yè)務(wù)依賴key次序時(shí)，那么我們就需要引入“sort”包來解決隨機(jī)化問題：
比如這樣：
package main
import (
"fmt"
"sort"
)
func main() {
language := make(map[string]string)
language["1"] = "Php"
language["2"] = "Go"
language["3"] = "Python3"
language["4"] = "C#"
sorted_keys := make([]string, 0)
for k, _ := range language {
sorted_keys = append(sorted_keys, k) // 提取鍵名
}
sort.Strings(sorted_keys) //
for _, k := range sorted_keys {
fmt.Printf("%v=>%v\n", k, language[k])
}
}
輸出：
BASIC
1=>Php
2=>Go
3=>Python3
4=>C#
這樣輸出的結(jié)果運(yùn)行多次也不會(huì)改變順序。
Golang json序列化（struct，int，map，slice）
package main
import (
"encoding/json"
"fmt"
)
//把結(jié)構(gòu)體都改小寫
type User struct {
UserName string `json:"user_name"` //json的tag標(biāo)記
Nickname string `json:"nickname"`
Age int
Birthday string
Sex string
Email string
Phone string
}
func testStruct() {
user1 := User{
UserName: "超哥",
Nickname: "大頭哥",
Age: 18,
Birthday: "2008/8/8",
Sex: "男",
Email: "mahuateng@qq.com",
Phone: "110",
}
//開始json序列化
data, err := json.Marshal(user1)
if err != nil {
fmt.Printf("json.marshal failed,err:", err)
return
}
fmt.Printf("%s\n", string(data))
}
func testInt() {
var a = 18
//開始json序列化
data, err := json.Marshal(a)
if err != nil {
fmt.Printf("json.marshal failed,err:", err)
return
}
fmt.Printf("%s\n", string(data))
}
func testMap() {
var m map[string]interface{} //聲明map
m = make(map[string]interface{}) //必須初始化map分配內(nèi)存
m["username"] = "user1"
m["age"] = 18
m["sex"] = "man"
fmt.Println(m)
data, err := json.Marshal(m)
if err != nil {
fmt.Printf("json.marshal failed,err:", err)
return
}
fmt.Printf("%s\n", string(data))
}
func testSlice() {
//定義一個(gè)slice，元素是map
var m map[string]interface{}
var s []map[string]interface{}
m = make(map[string]interface{})
m["username"] = "user1"
m["age"] = 18
m["sex"] = "man"
s = append(s, m)
m = make(map[string]interface{})
m["username"]="user2"
m["age"]=188
m["sex"]="male"
s=append(s,m)
data, err := json.Marshal(s)
if err != nil {
fmt.Printf("json.marshal failed,err:", err)
return
}
fmt.Printf("%s\n", string(data))
}
func main() {
testStruct() //結(jié)構(gòu)體的序列化
testInt()//序列化數(shù)值
testMap()//序列化map
testSlice()//序列化切片
}
到此這篇關(guān)于Go遍歷struct,map,slice的實(shí)現(xiàn)的文章就介紹到這了,更多相關(guān)Go遍歷struct,map,slice內(nèi)容請(qǐng)搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家！
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