2.golang应用目录结构和GOPATH概念
golang 语言有一个GOPATH的概念就是当前工作目录
[root@localhost golang_test]# tree . ├── bin │ └── hello ├── first.go ├── pkg ├── README.md ├── src │ └── github.com │ └── leleyao │ ├── hello │ │ └── hello.go │ ├── mymath │ │ └── mymath.go │ └── stringutil │ ├── reverse.go │ └── reverse_test.go └── statics └── timg.jpg [root@localhost golang_test]# tail -3 /etc/profile export GOPATH=/root/golang_test export PATH=$PATH:/go/bin export PATH=$PATH:$(go env GOPATH)/bin [root@localhost golang_test]# echo $GOPATH /root/golang_test [root@localhost golang_test]# echo $PATH /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/go/bin:/root/golang_test/bin:/root/bin
GOPATH的概念时代码的起始目录,当进行go install 或者代码级别的 import 时 默认的包搜索路径
通常一个代码 应该包含 src pkg bin 三个目录再GOPATH 之下
src 为源码路径
源码有三个分类
1.声明为package main 的包
go run 可直接运行 [root@localhost hello]# go run hello.go 123 0 Hello, My lele yao ! [root@localhost hello]# cat hello.go package main import ( "fmt" . "github.com/leleyao/stringutil" ) var _lele int func main() { var _song int _song = 123 fmt.Println(_song) fmt.Println(_lele) fmt.Println(Reverse("! oay elel yM ,olleH")) } go build 会在当前目录生成 同名二进制 [root@localhost hello]# pwd /root/golang_test/src/github.com/leleyao/hello [root@localhost hello]# go build github.com/leleyao/hello # 两种指定方式 [root@localhost hello]# ls hello hello.go [root@localhost hello]# go build [root@localhost hello]# ls hello hello.go [root@localhost hello]# # go install [root@localhost hello]# ll $GOPATH/bin total 1952 -rwxr-xr-x. 1 root root 1997543 May 23 09:51 hello go install 会在 GOPATH bin 下 生成 同名二进制
2. 一个代码目录下有多个文件且有文件不是 没有func main 则执行go install 会在对应目录生编译过程文件
ll /root/golang_test/pkg/linux_amd64/github.com/leleyao/stringutil.a -rw-r--r--. 1 root root 2902 May 23 13:07 /root/golang_test/pkg/linux_amd64/github.com/leleyao/stringutil.a [root@localhost stringutil]# rm -rf /root/golang_test/pkg/linux_amd64 [root@localhost stringutil]# cat reverse.go // Package stringutil contains utility functions for working with strings. package stringutil // Reverse returns its argument string reversed rune-wise left to right. func Reverse(s string) string { r := []rune(s) for i, j := 0, len(r)-1; i < len(r)/2; i, j = i+1, j-1 { r[i], r[j] = r[j], r[i] } return string(r) }
3. 以_test 结尾的文件会在执行 go test 命令时进行测试
[root@localhost stringutil]# go test PASS ok github.com/leleyao/stringutil 0.003s [root@localhost stringutil]# ls reverse.go reverse_test.go
golang跨平台编译
CGO_ENABLE=0 GOOS=linux GOARCH=amd64 go build
跨平台编译是关闭C的依赖
GOOS 指定平台类型 linux window darwin
GOARCH 指定服务器架构 amd64 arm
本文来自博客园,作者:萱乐庆foreverlove,转载请注明原文链接:https://www.cnblogs.com/leleyao/p/10911342.html