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.51sjk.com/Upload/Articles/1/0/254/254024_20210627003707404.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)