高性能可扩展极简 Web 框架
快速开始
安装
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go get -u github.com/labstack/echo/... |
创建一个 Hello world! 服务
创建 server.go 文件，代码如下：
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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
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go run server.go |
在浏览器中打开 http://localhost:1323 就可以看到 Hello, World!
路由
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e.POST("/users", saveUser) e.GET("/users/:id", getUser) e.PUT("/users/:id", updateUser) e.DELETE("/users/:id", deleteUser) |
路径参数
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// e.GET("/users/:id", getUser) func getUser(c echo.Context) error { // User ID from path `users/:id` id := c.Param("id") return c.String(http.StatusOK, id) } |
查询参数
例如，/show?team=x-men&member=wolverine
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//e.GET("/show", show) func show(c echo.Context) error { // Get team and member from the query string team := c.QueryParam("team") member := c.QueryParam("member") return c.String(http.StatusOK, "team:" + team + ", member:" + member) } |
在浏览器中访问 http://localhost:1323/show?team=x-men&member=wolverine 就能看到结果
application/x-www-form-urlencoded 表单提交
例如，POST /save
参数：name=””&email=””
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// e.POST("/save", save) func save(c echo.Context) error { // Get name and email name := c.FormValue("name") email := c.FormValue("email") return c.String(http.StatusOK, "name:" + name + ", email:" + email) } |
运行如下命令：
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curl -F "name=Joe Smith" -F "email=joe@labstack.com" http://localhost:1323/save // => name:Joe Smith, email:joe@labstack.com |
multipart/form-data 表单提交
例如，POST /save
参数：name=””&avatar=File()
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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>") } |
运行如下命令：
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curl -F "name=Joe Smith" -F "avatar=@/path/to/your/avatar.png" http://localhost:1323/save // => <b>Thank you! Joe Smith</b> |
请求处理
- 基于
Content-Type的请求头，将json,xml,form,query的负荷绑定到 Go struct 中 - 把返回的状态码也渲染到以
json,xml返回的响应中
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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) // or // return c.XML(http.StatusCreated, u) }) |
静态内容
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e.Static("/static", "static") |
中间件
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// 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) (bool, error) { if username == "joe" && password == "secret" { return true, nil } return false, nil })) // 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) |