问题点
缺少github.com/boombuler/barcode程序

models/util/code.go:23:2: cannot find package "github.com/boombuler/barcode" in any of:
	/root/gopath/src/gybadminapi/vendor/github.com/boombuler/barcode (vendor tree)
	/root/go/src/github.com/boombuler/barcode (from $GOROOT)
	/root/gopath/src/github.com/boombuler/barcode (from $GOPATH)
models/util/code.go:24:2: cannot find package "github.com/boombuler/barcode/qr" in any of:
	/root/gopath/src/gybadminapi/vendor/github.com/boombuler/barcode/qr (vendor tree)
	/root/go/src/github.com/boombuler/barcode/qr (from $GOROOT)
	/root/gopath/src/github.com/boombuler/barcode/qr (from $GOPATH)
models/util/code.go:25:2: cannot find package "github.com/golang/freetype" in any of:
	/root/gopath/src/gybadminapi/vendor/github.com/golang/freetype (vendor tree)
	/root/go/src/github.com/golang/freetype (from $GOROOT)
	/root/gopath/src/github.com/golang/freetype (from $GOPATH)

import "github.com/boombuler/barcode"

go get github.com/boombuler/barcode

下面安装go过程可忽略~~~~~~~~~

=============================================================

一、安装go环境

1.下载go软件包

官网：https://goproxy.io/zh/

wget https://gomirrors.org/dl/go/go1.15.2.linux-amd64.tar.gz

2.解压：

tar xf go1.15.2.linux-amd64.tar.gz

3.创建目录

go安装目录：/root/go(无需创建，解压自得)

go运行目录：mkdir -p /root/gopath 

4.添加环境变量

vim /etc/profile

末尾添加：

export GOROOT=/root/go
export GOPATH=/root/gopath
export PATH=$PATH:$GOROOT/bin:$GOPATH/bin
export GOPROXY=https://goproxy.io

最后一行表示，如果在构建中缺少构建文件，将会自动下载

5.立即生效

source /etc/profile

6.查看版本

go version

在使用go的时候如果依赖导入github上的，比如下面样式

import "github.com/boombuler/barcode"

在/root/gopath/目录下执行下载，执行get操作

go get github.com/boombuler/barcode

它会下载到你的gopath目录下

在我们引入第三方的时候，其会在三个地方区查找
1、GOROOT路径
2、GOPATH路径
3、在原目录中的vendor目录下进行查找

get执行后，发现src目录下产生相应的目录，那么报错解决