Go入门到精通系列

>go version
go version go1.17.7 windows

go install -v github.com/uudashr/gopkgs/v2/cmd/gopkgs@latest

go mod init example/hello

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

package main

import (
  //echo是go的web开发框架
  "github.com/labstack/echo/v4"
  "github.com/labstack/echo/v4/middleware"
  "net/http"
)

func main() {
  // Echo instance
  e := echo.New()

  // Middleware
  e.Use(middleware.Logger())
  e.Use(middleware.Recover())

  // Routes
  e.GET("/", hello)

  // Start server
  e.Logger.Fatal(e.Start(":1323"))
}

// Handler
func hello(c echo.Context) error {
  return c.String(http.StatusOK, "Hello, World!")
}

go run server.go

server.go:4:3: no required module provides package github.com/labstack/echo/v4; to add it:
        go get github.com/labstack/echo/v4
server.go:5:3: no required module provides package github.com/labstack/echo/v4/middleware; to add it:
        go get github.com/labstack/echo/v4/middleware

go get github.com/labstack/echo/v4

 go get github.com/labstack/echo/v4/middleware

PS F:\workcode\GoCode\hello> go run .\server.go

   ____    __
  / __/___/ /  ___
 / _// __/ _ \/ _ \
/___/\__/_//_/\___/ v4.6.3
High performance, minimalist Go web framework
https://echo.labstack.com
____________________________________O/_______
                                    O\
⇨ http server started on [::]:1323

.\server.go:4:3: imported and not used: "fmt"

package main

import (
  _"fmt"
)