golang || 环境准备（centos7）

第一个go程序

[root@golang code]# cat example.go 
package main

import "fmt"

func main() {
	fmt.Println("hello world")
}

#直接运行
[root@golang code]# go run example.go 
hello world

# 先编译再执行
[root@golang code]# go build example.go 
[root@golang code]# ls
example  example.go
[root@golang code]# ./example 
hello world

go的常用命令

查看go的帮助文档， --help

[root@localhost tmp]# go --help
Go is a tool for managing Go source code.
Usage:

    go <command> [arguments]

The commands are:

    bug         start a bug report
    build       compile packages and dependencies
    clean       remove object files and cached files
    doc         show documentation for package or symbol
    env         print Go environment information
    fix         update packages to use new APIs
    fmt         gofmt (reformat) package sources
    generate    generate Go files by processing source
    get         add dependencies to current module and install them
    install     compile and install packages and dependencies
    list        list packages or modules
    mod         module maintenance
    work        workspace maintenance
    run         compile and run Go program
    test        test packages
    tool        run specified go tool
    version     print Go version
    vet         report likely mistakes in packages

问题（gd 不能跳转源码）

解决：配置安装源

1. 设置module管理模式

go env -w GO111MODULE=on

 2.设置下载源

go env -w GOPROXY=https://goproxy.cn

3.下载guru

[root@golang code]# go get golang.org/x/tools/cmd/guru
go: go.mod file not found in current directory or any parent directory.
	'go get' is no longer supported outside a module.
	To build and install a command, use 'go install' with a version,
	like 'go install example.com/cmd@latest'
	For more information, see https://golang.org/doc/go-get-install-deprecation
	or run 'go help get' or 'go help install'.


[root@golang code]# go mod init mycode
go: creating new go.mod: module mycode
go: to add module requirements and sums:
	go mod tidy

[root@golang code]# ls
example  example.go  go.mod  pkg

[root@golang code]# go get golang.org/x/tools/cmd/guru
$GOPATH/go.mod exists but should not

[root@golang code]# rm -rf go.mod
[root@golang code]# mkdir test
[root@golang code]# cd test
[root@golang test]# ls
[root@golang test]# pwd
/root/code/test
[root@golang test]# go mod init mycode
go: creating new go.mod: module mycode
[root@golang test]# ls
go.mod
[root@golang test]# go get golang.org/x/tools/cmd/guru
go: downloading golang.org/x/tools v0.12.0
go: downloading golang.org/x/sys v0.11.0
go: downloading golang.org/x/mod v0.12.0
go: added golang.org/x/mod v0.12.0
go: added golang.org/x/sys v0.11.0
go: added golang.org/x/tools v0.12.0
[root@golang test]# go build golang.org/x/tools/cmd/guru
[root@golang test]# mv guru $(go env GOROOT)/bin
[root@golang test]# 


# 做完以上操作就可以正常跳转源码了

测试工具安装

安装curl

[root@localhost tmp]# yum install curl -y