快速开始

安装

$ go get github.com/labstack/echo/...

编写 Hello, World!

创建 server.go 文件

package main

import (
	"net/http"
	"github.com/labstack/echo"
)

func main() {
	e := echo.New()
	e.GET("/", func(c echo.Context) error {
		return c.String(http.StatusOK, "Hello, World!")
	})
	e.Logger.Fatal(e.Start(":1323"))
}

启动服务

$ go run server.go

用在浏览器访问 http://localhost:1323 然后你就能在页面上看到 Hello, World!

路由

e.POST("/users", saveUser)
e.GET("/users/:id", getUser)
e.PUT("/users/:id", updateUser)
e.DELETE("/users/:id", deleteUser)

URL路径参数

// e.GET("/users/:id", getUser)
func getUser(c echo.Context) error {
	// User ID 来自于url `users/:id`
	id := c.Param("id")
	return c.String(http.StatusOK, id)
}

请求参数

/show?team=x-men&member=wolverine

// e.GET("/show", show)
func show(c echo.Context) error {
	// 从请求参数里获取 team 和 member 的值
	team := c.QueryParam("team")
	member := c.QueryParam("member")
	return c.String(http.StatusOK, "team:" + team + ", member:" + member)
}

从浏览器访问 http://localhost:1323/show?team=x-men&member=wolverine 可以看到页面上显示”team:x-men, member:wolverine”

表单 application/x-www-form-urlencoded

POST /save

name value
name Joe Smith
email joe@labstack.com
// e.POST("/save", save)
func save(c echo.Context) error {
	// 获取 name 和 email 的值
	name := c.FormValue("name")
	email := c.FormValue("email")
	return c.String(http.StatusOK, "name:" + name + ", email:" + email)
}

在命令行里执行下面的语句

$ curl -F "name=Joe Smith" -F "email=joe@labstack.com" http://localhost:1323/save

控制台会输出name:Joe Smith, email:joe@labstack.com

表单 multipart/form-data

POST /save

name value
name Joe Smith
email joe@labstack.com
avatar avatar
func save(c echo.Context) error {
	// Get name
	name := c.FormValue("name")
	// Get avatar
  	avatar, err := c.FormFile("avatar")
  	if err != nil {
 		return err
 	}
 
 	// Source
 	src, err := avatar.Open()
 	if err != nil {
 		return err
 	}
 	defer src.Close()
 
 	// Destination
 	dst, err := os.Create(avatar.Filename)
 	if err != nil {
 		return err
 	}
 	defer dst.Close()
 
 	// Copy
 	if _, err = io.Copy(dst, src); err != nil {
  		return err
  	}

	return c.HTML(http.StatusOK, "<b>Thank you! " + name + "</b>")
}

命令行执行下面语句

$ curl -F "name=Joe Smith" -F "avatar=@/path/to/your/avatar.png" http://localhost:1323/save
//output => <b>Thank you! Joe Smith</b>

同时在项目目录下可以看到刚刚上传的图片。

处理请求

  • 在数据结构体里设置 JSONXMLform 标签直接匹配请求头的 Content-Type
  • 结合响应状态将响应渲染为 JSON 或者 XML
type User struct {
	Name  string `json:"name" xml:"name" form:"name" query:"name"`
	Email string `json:"email" xml:"email" form:"email" query:"email"`
}

e.POST("/users", func(c echo.Context) error {
	u := new(User)
	if err := c.Bind(u); err != nil {
		return err
	}
	return c.JSON(http.StatusCreated, u)
	// 或者
	// return c.XML(http.StatusCreated, u)
})

静态资源

下面的代码定义/static/*目录为静态资源文件目录

e.Static("/static", "static")
了解更多…

模板渲染

中间件

// Root level middleware
e.Use(middleware.Logger())
e.Use(middleware.Recover())

// Group level middleware
g := e.Group("/admin")
g.Use(middleware.BasicAuth(func(username, password string, c echo.Context) (error, bool) {
  if username == "joe" && password == "secret" {
    return nil, true
  }
  return nil, false
}))

// Route level middleware
track := func(next echo.HandlerFunc) echo.HandlerFunc {
	return func(c echo.Context) error {
		println("request to /users")
		return next(c)
	}
}
e.GET("/users", func(c echo.Context) error {
	return c.String(http.StatusOK, "/users")
}, track)

#####了解更多