go语言web开发系列之二十四:用imagemagick为上传图片生成缩略图

一，安装所需的外部程序

1,用apt-get安装ImageMagick

root@ku:/data/liuhongdi/digv23# apt-get install imagemagick

2,查看安装是否成功:

root@ku:/data/liuhongdi/digv23# convert --version
Version: ImageMagick 6.9.10-23 Q16 x86_64 20190101 https://imagemagick.org
Copyright: © 1999-2019 ImageMagick Studio LLC
License: https://imagemagick.org/script/license.php
Features: Cipher DPC Modules OpenMP
Delegates (built-in): bzlib djvu fftw fontconfig freetype jbig jng jp2 jpeg lcms lqr ltdl lzma openexr pangocairo png tiff webp wmf x xml zlib

3,查看convert的默认安装路径:

root@ku:/data/liuhongdi/digv23# whereis convert
convert: /usr/bin/convert /usr/share/man/man1/convert.1.gz

说明：刘宏缔的go森林是一个专注golang的博客，
网站：https://blog.imgtouch.com
原文: go语言web开发系列之二十四:用imagemagick为上传图片生成缩略图 – 架构森林

说明：作者:刘宏缔 邮箱: 371125307@qq.com

二，演示项目的相关信息

1,地址:

GitHub - liuhongdi/digv24: 用imagemagick的convert命令为上传图片生成缩略图

2,功能：演示go调用shell命令生成缩略图

3,项目结构: 如图:

三，配置文件说明

1,config/config.yaml

Server:RunMode: debugHttpPort: 8000ReadTimeout: 60WriteTimeout: 60
Log:LogFilePath: /data/gologs/logsLogInfoFileName: infoLogWarnFileName: warnLogFileExt: log
AccessLog:LogFilePath: /data/gologs/logsLogFileName: accessLogFileExt: log
Static:StaticDir: /data/liuhongdi/digv24/static
ArticleImage:UploadDir: /data/liuhongdi/digv24/static/ware/origTmbDir: /data/liuhongdi/digv24/static/ware/tmbImageHost: http://127.0.0.1:8000

说明：

StaticDir:静态文件的保存目录

UploadDir:文章配图的原始图上传后保存目录

TmbDir:  文章配图的缩略图保存目录

ImageHost:访问文章配图url的host

四，go代码说明

1,controller/imageController.go

package controllerimport ("fmt""github.com/gin-gonic/gin""github.com/liuhongdi/digv24/global""github.com/liuhongdi/digv24/pkg/image""github.com/liuhongdi/digv24/pkg/result""github.com/liuhongdi/digv24/pkg/validCheck""github.com/liuhongdi/digv24/request""strconv"
)type ImageController struct{}func NewImageController() ImageController {return ImageController{}
}
//上传单张图片
func (a *ImageController) UploadOne(c *gin.Context) {resultRes := result.NewResult(c)param := request.ArticleRequest{ID: validCheck.StrTo(c.Param("id")).MustUInt64()}valid, errs := validCheck.BindAndValid(c, ¶m)if !valid {resultRes.Error(400,errs.Error())return}//save imagef, err := c.FormFile("f1s")//错误处理if err != nil {fmt.Println(err.Error())resultRes.Error(1,"图片上传失败")} else {//将文件保存至本项目根目录中idstr:=strconv.FormatUint(param.ID, 10)destImage := global.ArticleImageSetting.UploadDir+"/"+idstr+".jpg"err := c.SaveUploadedFile(f, destImage)if (err != nil){fmt.Println("save err:")fmt.Println(err)resultRes.Error(1,"图片保存失败")} else {//make tmborig:= destImagedest := global.ArticleImageSetting.TmbDir+"/"+idstr+".jpg"err := image.ConvertByLong(orig,dest,300)if (err != nil){fmt.Println(err)}origUrl := global.ArticleImageSetting.ImageHost+"/static/ware/orig/"+idstr+".jpg"tmbUrl := global.ArticleImageSetting.ImageHost+"/static/ware/tmb/"+idstr+".jpg"resultRes.Success(gin.H{"origurl":origUrl,"tmburl":tmbUrl})}}return
}

2,pkg/image/convert.go

package imageimport ("bytes""errors""fmt""os/exec""strconv"
)//按指定的图片的长边，生成缩略图
func ConvertByLong(orig,dest string,long int) error {longstr := strconv.Itoa(long)cmd := "/usr/bin/convert -size "+longstr+"x"+longstr+" -resize "+longstr+"x"+longstr+" +profile '*' "+orig+" "+dest+" 2>&1"out,err := execShell(cmd)fmt.Println(out)fmt.Println(err)if (err != nil) {return err}if (out != "") {return errors.New(out)}return nil
}//执行shell命令
func execShell(s string) (string, error){//函数返回一个*Cmd，用于使用给出的参数执行name指定的程序cmd := exec.Command("/bin/bash", "-c", s)var out bytes.Buffercmd.Stdout = &outerr := cmd.Run()//checkErr(err)return out.String(), err
}

3,static/upload.html

单文件上传：
 

4，其他相关代码可访问github查看

五，测试效果

1,打开上传页面，访问:

http://127.0.0.1:8000/static/upload.html

返回如图:

上传一张图片后返回:

点击tmburl,可以看到缩放为长边300的图片:

六，查看库的版本

module github.com/liuhongdi/digv24go 1.15require (github.com/gin-gonic/gin v1.6.3github.com/go-playground/universal-translator v0.17.0github.com/go-playground/validator/v10 v10.2.0github.com/jinzhu/gorm v1.9.16github.com/lestrrat/go-file-rotatelogs v0.0.0-20180223000712-d3151e2a480fgithub.com/lestrrat/go-strftime v0.0.0-20180220042222-ba3bf9c1d042 // indirectgithub.com/magiconair/properties v1.8.4 // indirectgithub.com/mitchellh/mapstructure v1.3.3 // indirectgithub.com/pelletier/go-toml v1.8.1 // indirectgithub.com/pkg/errors v0.9.1 // indirectgithub.com/spf13/afero v1.4.1 // indirectgithub.com/spf13/cast v1.3.1 // indirectgithub.com/spf13/jwalterweatherman v1.1.0 // indirectgithub.com/spf13/pflag v1.0.5 // indirectgithub.com/spf13/viper v1.7.1go.uber.org/multierr v1.6.0 // indirectgo.uber.org/zap v1.16.0golang.org/x/sys v0.0.0-20201119102817-f84b799fce68 // indirectgolang.org/x/text v0.3.4 // indirectgopkg.in/ini.v1 v1.62.0 // indirectgopkg.in/yaml.v2 v2.3.0 // indirect
)

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