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实习第一周（Golang）

2020-08-22 17:23 670人阅读评论(0)

一，序

2020年8月3我来实习了，试想一个Java都还没学会熟练使用的人，却要用golang去重新做项目，我能退缩吗，当然不能，于是我用一周的时间来熟悉golang，

二，基础学习

于是我对基础的数据类型，指针，运算符，程序流程控制，函数，包，错误处理，数组，切片，map，结构体，方法，封装继承接口

以及多态，文件操作，以及JSON序列化反序列化，单元测试，进程，线程，反射，管道，socket编程，redis，等有了初步了解，是不是现在就成功了，肿么可能，我要立马上线，去拿项目读源码学习，于是开始了我的配置环境阶段

三，环境安装

我安装的是最新的go版本1.14，下载的是go1.14.windows-amd64.msi 安装文件。文件需要到https://golang.org/ 去下载。由于众所周知的原因，需要翻墙，否则网站打不开。

安装很顺利。安装完后打开一个cmd窗口，输入：

E:\goproject>go version
go version go1.14.6 windows/amd64

说明已经安装成功。

四，项目操练

想着到github上找一个go语言编写的项目弄到本地查看编译下。找到一个bee，beego在如何获取地方看到：

go get github.com/astaxie/beego

这是要在cmd 窗口直接输入这行命令就能获取。我于是试了下。可是，输入命令后看着是在运行，但是运行结束后，报以下提示信息，

原来是代理的问题，

unrecognized import path "golang.org/x/text/transform": https fetch: Get "https://golang.org/x/text/transform?go-get=1":
 dial tcp 216.239.37.1:443: connectex: A connection attempt failed because the connected party did not properly respond
after a period of time, or established connection failed because connected host has failed to respond.
unrecognized import path "golang.org/x/text/unicode/norm": https fetch: Get "https://golang.org/x/text/unicode/norm?go-g
et=1": dial tcp 216.239.37.1:443: connectex: A connection attempt failed because the connected party did not properly re
spond after a period of time, or established connection failed because connected host has failed to respond.
# cd .; git clone -- https://github.com/gadelkareem/delve C:\Users\luckly\go\src\github.com\gadelkareem\delve
Cloning into 'C:\Users\luckly\go\src\github.com\gadelkareem\delve'...
error: RPC failed; curl 56 OpenSSL SSL_read: SSL_ERROR_SYSCALL, errno 104
fatal: the remote end hung up unexpectedly
fatal: early EOF
fatal: index-pack failed
package github.com/gadelkareem/delve/pkg/terminal: exit status 128
package github.com/gadelkareem/delve/service: cannot find package "github.com/gadelkareem/delve/service" in any of:
        F:\sofaware\GO\src\github.com\gadelkareem\delve\service (from $GOROOT)
        C:\Users\luckly\go\src\github.com\gadelkareem\delve\service (from $GOPATH)
package github.com/gadelkareem/delve/service/debugger: cannot find package "github.com/gadelkareem/delve/service/debugger" in any of:
        F:\sofaware\GO\src\github.com\gadelkareem\delve\service\debugger (from $GOROOT)
        C:\Users\luckly\go\src\github.com\gadelkareem\delve\service\debugger (from $GOPATH)
package github.com/gadelkareem/delve/service/rpc2: cannot find package "github.com/gadelkareem/delve/service/rpc2" in any of:
        F:\sofaware\GO\src\github.com\gadelkareem\delve\service\rpc2 (from $GOROOT)
        C:\Users\luckly\go\src\github.com\gadelkareem\delve\service\rpc2 (from $GOPATH)
package github.com/gadelkareem/delve/service/rpccommon: cannot find package "github.com/gadelkareem/delve/service/rpccommon" in any of:
        F:\sofaware\GO\src\github.com\gadelkareem\delve\service\rpccommon (from $GOROOT)
        C:\Users\luckly\go\src\github.com\gadelkareem\delve\service\rpccommon (from $GOPATH)
# cd C:\Users\luckly\go\src\github.com\astaxie\beego; git pull --ff-only
fatal: not a git repository (or any parent up to mount point /cygdrive)
Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).
package github.com/astaxie/beego/swagger: exit status 128
package github.com/astaxie/beego/utils: cannot find package "github.com/astaxie/beego/utils" in any of:
        F:\sofaware\GO\src\github.com\astaxie\beego\utils (from $GOROOT)
        C:\Users\luckly\go\src\github.com\astaxie\beego\utils (from $GOPATH)

于是我发挥了爱学习，爱搜索，爱询问的能力，了解到了有代理这回事，使用go.mod来进行包管理

GO111MODULE

GO111MODULE有三个值：off, on和auto（默认值）。

GO111MODULE=off，go命令行将不会支持module功能，寻找依赖包的方式将会沿用旧版本那种通过vendor目录或者GOPATH模式来查找。
GO111MODULE=on，go命令行会使用modules，而一点也不会去GOPATH目录下查找。
```
GO111MODULE=auto
```
，默认值，go命令行将会根据当前目录来决定是否启用module功能。这种情况下可以分为两种情形：
- 当前目录在GOPATH/src之外且该目录包含go.mod文件
- 当前文件在包含go.mod文件的目录下面。

那么我们就来设置吧，我打开命令行：

C:\Users\luckly>go env -w GO111MODULE=on

C:\Users\luckly>go env -w GOPROXY=https://goproxy.io,direct

并进行了简单测试，新建一个名为 main.go的项目，项目路径 e:\goproject （注意，该路径并不在GOPATH里）

当我再次打开命令行的时候

C:\Users\luckly>go get github.com/beego/bee
go: downloading github.com/beego/bee v1.12.0
go: github.com/beego/bee upgrade => v1.12.0
go: downloading github.com/gorilla/websocket v1.4.2
go: downloading github.com/astaxie/beego v1.12.1
go: downloading github.com/lib/pq v1.7.0
go: downloading github.com/go-sql-driver/mysql v1.5.0
go: downloading github.com/gadelkareem/delve v1.4.2-0.20200619175259-dcd0133
go: downloading github.com/smartwalle/pongo2render v1.0.1
go: downloading gopkg.in/yaml.v2 v2.3.0
go: downloading github.com/pelletier/go-toml v1.2.0
go: downloading github.com/davecgh/go-spew v1.1.1
go: downloading github.com/fsnotify/fsnotify v1.4.9
go: downloading github.com/flosch/pongo2 v0.0.0-20200529170236-5abacdfa4915
go: downloading golang.org/x/sys v0.0.0-20191005200804-aed5e4c7ecf9
go: downloading github.com/spf13/viper v1.7.0
go: downloading github.com/hashicorp/hcl v1.0.0
go: downloading github.com/spf13/pflag v1.0.3
go: downloading github.com/mitchellh/mapstructure v1.1.2
go: downloading github.com/spf13/jwalterweatherman v1.0.0
go: downloading gopkg.in/ini.v1 v1.51.0
go: downloading github.com/spf13/cast v1.3.0
go: downloading github.com/magiconair/properties v1.8.1
go: downloading github.com/subosito/gotenv v1.2.0
go: downloading github.com/spf13/afero v1.1.2
go: downloading golang.org/x/text v0.3.2
go: downloading github.com/sirupsen/logrus v1.6.0
go: downloading github.com/mattn/go-colorable v0.0.9
go: downloading github.com/cosiner/argv v0.1.0
go: downloading github.com/mattn/go-isatty v0.0.3
go: downloading golang.org/x/arch v0.0.0-20190927153633-4e8777c89be4
go: downloading github.com/peterh/liner v0.0.0-20170317030525-88609521dc4b
go: downloading github.com/hashicorp/golang-lru v0.5.4
go: downloading go.starlark.net v0.0.0-20190702223751-32f345186213
go: downloading github.com/konsorten/go-windows-terminal-sequences v1.0.3

竟然成功了，

于是我又紧追其后，在命令行输入了


C:\Users\luckly>bee
Bee is a Fast and Flexible tool for managing your Beego Web Application.

USAGE
    bee command [arguments]

AVAILABLE COMMANDS

    version     Prints the current Bee version
    migrate     Runs database migrations
    api         Creates a Beego API application
    bale        Transforms non-Go files to Go source files
    fix         Fixes your application by making it compatible with newer versions of Beego
    pro         Source code generator
    dlv         Start a debugging session using Delve
    dockerize   Generates a Dockerfile for your Beego application
    generate    Source code generator
    hprose      Creates an RPC application based on Hprose and Beego frameworks
    new         Creates a Beego application
    pack        Compresses a Beego application into a single file
    rs          Run customized scripts
    run         Run the application by starting a local development server
    server      serving static content over HTTP on port

Use bee help [command] for more information about a command.

ADDITIONAL HELP TOPICS


Use bee help [topic] for more information about that topic.

又成功了，至次就成功了吗？没有，为啥？

bee下载到那儿了，不知道，罪过罪过，在我的go语言安装目录的，src ,pkg等下面都没找到，这难道没安上？还是哪里有问题。各种查找。最后终于找到一个解决办法。需要自己创建一个工作区目录。为什么不使用安装目录，是因为要保证安装目录的纯洁性。

打开一看，咋跑C盘去了，仔细一看是自己把代码敲错了，自动添加到C盘了，