golang 生成二维码海报的实现代码

import ( 
 "errors" 
 "fmt"
 "github.com/nfnt/resize" 
 "github.com/skip2/go-qrcode" 
 "image" 
 "image/draw" 
 "image/png" 
 "os"
 ) 
 
var err error 
 
func createAvatar() (image.Image, error) { 
 var ( 
 bgImg  image.Image 
 offset  image.Point 
 avatarFile *os.File 
 avatarImg image.Image 
 ) 
 
 bgImg, err = createQrCode("http://www.baidu.com") 
 
 if err != nil { 
 fmt.Println("创建二维码失败:", err) 
 return nil, errors.New("创建二维码失败") 
 } 
 avatarFile, err = os.Open("./avatar.png") 
 avatarImg, err = png.Decode(avatarFile) 
 avatarImg = ImageResize(avatarImg, 40, 40) 
 b := bgImg.Bounds() 
 
 // 设置为居中 
 offset = image.Pt((b.Max.X-avatarImg.Bounds().Max.X)/2, (b.Max.Y-avatarImg.Bounds().Max.Y)/2) 
 
 m := image.NewRGBA(b) 
 
 draw.Draw(m, b, bgImg, image.Point{X: 0, Y: 0,}, draw.Src) 
 
 draw.Draw(m, avatarImg.Bounds().Add(offset), avatarImg, image.Point{X: 0, Y: 0}, draw.Over) 
 
 return m, err 
} 
 
func createQrCode(content string) (img image.Image, err error) { 
 var qrCode *qrcode.QRCode 
 
 qrCode, err = qrcode.New(content, qrcode.Highest) 
 
 if err != nil { 
 return nil, errors.New("创建二维码失败") 
 } 
 qrCode.DisableBorder = true 
 
 img = qrCode.Image(150) 
 
 return img, nil 
} 
 
func ImageResize(src image.Image, w, h int) image.Image { 
 return resize.Resize(uint(w), uint(h), src, resize.Lanczos3) 
}

func main() { 
 var ( 
 bgFile *os.File 
 bgImg  image.Image 
 qrCodeImg image.Image 
 offset image.Point 
 ) 
 
 // 01: 打开背景图片 
 bgFile, err = os.Open("./bg.png") 
 if err != nil { 
 fmt.Println("打开背景图片失败", err) 
 return 
 } 
 
 defer bgFile.Close() 
 
 // 02: 编码为图片格式 
 bgImg, err = png.Decode(bgFile) 
 if err != nil { 
 fmt.Println("背景图片编码失败:", err) 
 return 
 } 
 
 // 03: 生成二维码 
 qrCodeImg, err = createAvatar() 
 if err != nil { 
 fmt.Println("生成二维码失败:", err) 
 return 
 } 
 
 offset = image.Pt(426, 475) 
 
 b := bgImg.Bounds() 
 
 m := image.NewRGBA(b) 
 
 draw.Draw(m, b, bgImg, image.Point{X: 0, Y: 0,}, draw.Src) 
 
 draw.Draw(m, qrCodeImg.Bounds().Add(offset), qrCodeImg, image.Point{X: 0, Y: 0}, draw.Over) 
 
 // 上传至oss时这段要改 
 i, _ := os.Create(path.Base("a2.png")) 
 
 _ = png.Encode(i, m) 
 
 defer i.Close() 
 
}

func ossClient() (bucket *alioss.Bucket, err error) { 
 var ( 
 key string = "xxx" 
 bucketName string = "xxx" 
 secret string = "xxx" 
 endpoint string = "xxx" 
 ) 
 
 // 创建OSSClient实例。 
 client, err = alioss.New(endpoint, key, secret) 
 
 if err != nil { 
 fmt.Println("获取阿里云oss实例失败:", err) 
 return nil, errors.New("资源服务器配置有误") 
 } 
 // 获取存储空间。 
 bucket, err = client.Bucket(bucketName) 
 
 if err != nil { 
 logger.Error("获取阿里云oss存储空间错误:", err) 
 return nil, errors.New("获取存储服务器失败") 
 } 
 return bucket, nil 
}

bucket, err = ossClient() 
 
if err != nil { 
 fmt.Println("error:", err) 
 return 
} 
 
imgBuff := bytes.NewBuffer(nil) //开辟一个新的空buff 
err = png.Encode(imgBuff, m) //img写入到buff 
 
if err != nil { 
 fmt.Println("写入缓冲区失败",err) 
 return
} 
 
err = bucket.PutObject("qrcode/2-1.png", imgBuff) 
 
fmt.Println("error:", err)