09.golang数据类型转换汇总

Abel sun2023年1月6日约 648 字大约 2 分钟

09.golang数据类型转换汇总

golang作为强类型语言，我们在日常开发过程中，遇到类型转换的场景也非常多，本文整理我在工作开发中遇到过的类型转换实践。

String To Other

string to int

方法一

 str := "10"
 int, err := strconv.Atoi(str)

方法二

 str := "10"
 int, err := strconv.ParseInt(str, 10, 0)

string to int8

 str := "10"
 int, err := strconv.ParseInt(str, 10, 8)

string to int32

int32也叫做rune

 str := "10"
 int, err := strconv.ParseInt(str, 10, 32)

string to int64

 str := "10"
 int, err := strconv.ParseInt(str, 10, 64)

string to float32

 ret, _ := strconv.ParseFloat("3.14159", 32)
 fmt.Println(ret)

string to float64

 ret, _ := strconv.ParseFloat("3.14159", 64)
 fmt.Println(ret)

string to []byte
```
 s1 := "hello"
  b := []byte(s1)
```

json string to map

func JsonToMap(jsonStr string) (m map[string]string, err error) {
 err = json.Unmarshal([]byte(jsonStr), &m)
 if err != nil {
  return nil, err
 }
 return
}

Other To String

[]byte to string

 var s1 []byte
 fmt.Println(string(s1))

int64 to string

int, int32, int16, int8 转十进制字符串

 var number int = 12 // 您可以在这里使用任何整数: int32, int16, int8
 s := strconv.FormatInt(int64(123), 10)
 fmt.Println(s)

要转换int为string也可以使用strconv.Itoaopen in new windowwhich 等价于strconv.FormatInt(int64(i), 10)open in new window.
 number := 12
 str := strconv.Itoa(number)
 fmt.Println(str)

Map To Other

map to json string

func MapToJson(m map[string]string) (string, error) {
 result, err := json.Marshal(m)
 if err != nil {
  return "", nil
 }
 return string(result), nil
}

通常也会使用一些第三方的json库进行解析，这里推荐：github.com/json-iterator/goopen in new window

package main

import (
 "fmt"

 jsoniter "github.com/json-iterator/go"
)

var json = jsoniter.ConfigCompatibleWithStandardLibrary

func main() {
 tmpData := map[string]interface{}{"name": "eryajf", "age": 18}

 output, err := json.Marshal(&tmpData)
 if err != nil {
  fmt.Println(err)
 }
 fmt.Println(string(output))
}

map to slice

func MapToSlice(m map[int]string) []string {
  s := make([]string, 0, len(m))
  for _, v := range m {
    s = append(s, v)
  }
  return s
}

Json To Other

json to map

func JsonToMap() {
 jsonStr := `{"name": "eryajf","age": 18}`
 var mapResult map[string]interface{}
 err := json.Unmarshal([]byte(jsonStr), &mapResult)
 if err != nil {
  fmt.Println("JsonToMap err: ", err)
 }
 fmt.Println(mapResult)
}

json to struct

package main

import (
 "encoding/json"
 "fmt"
)

type People struct {
 Name string `json:"name"`
 Age int `json:"age"`
}

func main() {
 jsonStr := `{"name": "eryajf","age": 18}`
 var people People
 json.Unmarshal([]byte(jsonStr), &people)
 fmt.Println(people.Name, people.Age)
}

使用第三方JSON库进行解析：

package main

import (
 "fmt"

 jsoniter "github.com/json-iterator/go"
)

type People struct {
 Name string `json:"name"`
 Age int `json:"age"`
}

func main() {
 jsonStr := `{"name": "eryajf","age": 18}`
 var people People
 json.Unmarshal([]byte(jsonStr), &people)
 fmt.Println(people.Name, people.Age)
}

Struct To Other

struct to json

package main

import (
 "encoding/json"
 "fmt"
)

type People struct {
 Name string `json:"name"`
 Age int `json:"age"`
}

func main() {
 p := People{
  Name: "eryajf",
  Age:  18,
 }
 jsonBytes, err := json.Marshal(p)
 if err != nil {
  fmt.Println(err)
 }
 fmt.Println(string(jsonBytes))
}

同理，这里仍旧可以借助第三方JSON库进行解析：

package main

import (
 "fmt"

 jsoniter "github.com/json-iterator/go"
)

var json = jsoniter.ConfigCompatibleWithStandardLibrary

type People struct {
 Name string `json:"name"`
 Age  int    `json:"age"`
}

func main() {
 p := People{
  Name: "eryajf",
  Age:  18,
 }
 jsonBytes, err := json.Marshal(p)
 if err != nil {
  fmt.Println(err)
 }
 fmt.Println(string(jsonBytes))
}

未完。。。

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09.golang数据类型转换汇总

# 09.golang数据类型转换汇总

# String To Other

# Other To String

# Map To Other

# Json To Other

# Struct To Other

预览:

09.golang数据类型转换汇总

String To Other

Other To String

Map To Other

Json To Other

Struct To Other