Go语言中图片与Base64互相转换

1、图片转成Base64

package main

import (
	"encoding/base64"
	"fmt"
	"os"
)

func main() {
	file, err := os.Open("jw.png")
	if err != nil {
		fmt.Printf("os open file error %v\n", err)
		return
	}
	defer file.Close()

	// 获取文件的统计相关信息
	info, err := file.Stat()
	if err != nil {
		fmt.Printf("file stat error %v\n", err)
		return
	}

	srcBuffer := make([]byte, info.Size())
	n, err := file.Read(srcBuffer)
	if err != nil {
		fmt.Printf("file read error %v\n", err)
		return
	}

	// 转base64
	base64Str := base64.StdEncoding.EncodeToString(srcBuffer[:n])
	fmt.Printf("Base64: %v\n", base64Str)
}

2、Base64转成图片

package main

import (
	"encoding/base64"
	"fmt"
	"os"
)

func main() {
	base64Str := "xxxxx"

	base64Bytes, err := base64.StdEncoding.DecodeString(base64Str)
	if err != nil {
		fmt.Printf("base64 decode string error %v\n", err)
		return
	}

	// 创建图片
	newFile, err := os.OpenFile("demo004/new.png", os.O_RDWR|os.O_CREATE, os.ModePerm)
	if err != nil {
		fmt.Printf("os open new file error %v\n", err)
		return
	}
	defer newFile.Close()
	newFile.Write(base64Bytes)
}