go-echo学习笔记，包含了请求与响应，路由，参数解析，模版渲染，登录验证，日志，文件上传与下载，websocket通信。

Part1 Get与Post

主要内容包括登录网页，发送请求并进行处理

import ("github.com/labstack/echo""net/http"
)func main01() {e := echo.New()e.GET("/", func(c echo.Context) error {return c.String(http.StatusOK, "<h1>Hello, World</h1>")})e.Logger.Fatal(e.Start(":1323"))
}

Part2 四种请求

包含了PUT,DELETE PUT与GET，测试的时候需要结合Postman,其中请求时，静态路由要大于参数路由大于匹配路由。

import ("github.com/labstack/echo""net/http"
)func HelloFunc(c echo.Context) error {return c.String(http.StatusOK, "Hello, World!")
}func UserHandler(c echo.Context) error {return c.String(http.StatusOK, "UserHandler")
}func CreateProduct(c echo.Context) error {return c.String(http.StatusOK, "CreateProduct")
}
func FindProduct(c echo.Context) error {return c.String(http.StatusOK, "FindProduct")
}
func UpdateProduct(c echo.Context) error {return c.String(http.StatusOK, "UpdateProduct")
}
func DeleteProduct(c echo.Context) error {return c.String(http.StatusOK, "DeleteProduct")
}// 静态 > 参数 > 匹配路由
func main() {e := echo.New()e.GET("/", HelloFunc)r := e.Group("/api")r.GET("/user", UserHandler)//r.GET("/score", ScoreHandler)r.POST("/user", CreateProduct)r.DELETE("/user", DeleteProduct)r.PUT("/user", UpdateProduct)e.Logger.Fatal(e.Start(":1325"))e.GET("/product/1/price/*", func(c echo.Context) error {return c.String(http.StatusOK, "Product 1 price all")})e.GET("/product/:id", func(c echo.Context) error {return c.String(http.StatusOK, "Product "+c.Param("id"))})e.GET("/product/new", func(c echo.Context) error {return c.String(http.StatusOK, "Product new")})}

Part3 提取参数

在接收网页端的请求时，要对请求进行解析。如何解析是这个part的内容，表单发送过来的请求，REST请求，普通带问候的请求方式

package mainimport ("github.com/labstack/echo""net/http"
)func MyHandler(c echo.Context) error {p := new(Product)if err := c.Bind(p); err != nil {return c.String(http.StatusBadRequest, "bad request")}return c.JSON(http.StatusOK, p)
}func MyHandler2(c echo.Context) error {name := c.FormValue("name")return c.String(http.StatusOK, name)
}func MyHandler3(c echo.Context) error {name := c.QueryParam("name")return c.String(http.StatusOK, name)
}func MyHandler4(c echo.Context) error {name := c.Param("name")return c.String(http.StatusOK, name)
}type Product struct {Name  string `json:"name" form:"name" query:"name"`Price int    `json:"price" form:"price" query:"price"`
}func main() {e := echo.New()e.GET("/products", MyHandler)//在postman 中formdata进行请求e.GET("/products2", MyHandler2)//与products类似e.GET("/products3", MyHandler3)e.GET("/products4/:name", MyHandler4)e.Logger.Fatal(e.Start(":1328"))
}

Part4 解析json与xml

本part对json传输进行了详细的demo样例，json较为常用。

import ("encoding/json""github.com/labstack/echo""net/http"
)type Product struct {Name  string `json:"name" form:"name" query:"name"`Price int    `json:"price" form:"price" query:"price"`
}func main() {e := echo.New()e.GET("/", func(c echo.Context) error {return c.String(http.StatusOK, "Hello, World!")})e.GET("/html", func(c echo.Context) error {return c.HTML(http.StatusOK, "<h1>Hello, World!</h1>")})e.GET("/json", func(c echo.Context) error {p := &Product{Name:  "football",Price: 1000,}return c.JSON(http.StatusOK, p)})e.GET("/prettyjson", func(c echo.Context) error {p := &Product{Name:  "soccer",Price: 1000,}return c.JSONPretty(http.StatusOK, p, "  ")})e.GET("/streamjson", func(c echo.Context) error {p := &Product{Name:  "soccer",Price: 134,}c.Response().Header().Set("Content-Type", echo.MIMEApplicationXMLCharsetUTF8)c.Response().WriteHeader(http.StatusOK)return json.NewEncoder(c.Response()).Encode(p)})e.GET("/jsonblob", func(c echo.Context) error {p := &Product{Name:  "volley",Price: 120,}data, _ := json.Marshal(p)return c.JSONPBlob(http.StatusOK, "", data)})e.GET("/xml", func(c echo.Context) error {p := &Product{Name:  "basketball",Price: 120,}return c.XML(http.StatusOK, p)})e.GET("/png", func(c echo.Context) error {//return c.File("./public/left.png")return c.File("./public/test.html")})e.GET("blub", func(c echo.Context) error {data := []byte(`0306703,0035866,NO_ACTION,06/19/2006`)return c.Blob(http.StatusOK, "text/csv", data)})e.GET("null", func(c echo.Context) error {return c.NoContent(http.StatusOK)})e.Logger.Fatal(e.Start(":1330"))
}

Part5 json传输

package mainimport ("encoding/json""github.com/labstack/echo""net/http"
)type Product struct {Name  string `json:"name" form:"name" query:"name"`Price int    `json:"price" form:"price" query:"price"`
}func main() {e := echo.New()e.GET("/", func(c echo.Context) error {return c.String(http.StatusOK, "Hello, World!")})e.GET("/html", func(c echo.Context) error {return c.HTML(http.StatusOK, "<h1>Hello, World!</h1>")})e.GET("/json", func(c echo.Context) error {p := &Product{Name:  "football",Price: 1000,}return c.JSON(http.StatusOK, p)})e.GET("/prettyjson", func(c echo.Context) error {p := &Product{Name:  "soccer",Price: 1000,}return c.JSONPretty(http.StatusOK, p, "  ")})e.GET("/streamjson", func(c echo.Context) error {p := &Product{Name:  "soccer",Price: 134,}c.Response().Header().Set("Content-Type", echo.MIMEApplicationXMLCharsetUTF8)c.Response().WriteHeader(http.StatusOK)return json.NewEncoder(c.Response()).Encode(p)})e.GET("/jsonblob", func(c echo.Context) error {p := &Product{Name:  "volley",Price: 120,}data, _ := json.Marshal(p)return c.JSONPBlob(http.StatusOK, "", data)})e.GET("/xml", func(c echo.Context) error {p := &Product{Name:  "basketball",Price: 120,}return c.XML(http.StatusOK, p)})e.GET("/png", func(c echo.Context) error {//return c.File("./public/left.png")return c.File("./public/test.html")})e.GET("blub", func(c echo.Context) error {data := []byte(`0306703,0035866,NO_ACTION,06/19/2006`)return c.Blob(http.StatusOK, "text/csv", data)})e.GET("null", func(c echo.Context) error {return c.NoContent(http.StatusOK)})e.Logger.Fatal(e.Start(":1330"))
}

Part6 模版渲染

import ("github.com/labstack/echo""net/http"
)func main() {e := echo.New()e.GET("/", func(c echo.Context) error {return c.String(http.StatusOK, "Hello, World!")})e.GET("/index", func(c echo.Context) error {return c.File("assets/index.html")})e.Static("/static", "assets")e.Logger.Fatal(e.Start(":9090"))
}

Part7 模版参数传递

import ("github.com/labstack/echo""html/template""io""net/http"
)type Template struct {templates *template.Template
}func (t *Template) Render(w io.Writer,name string, data interface{}, c echo.Context) error {return t.templates.ExecuteTemplate(w, name, data)
}
func main() {e := echo.New()t := &Template{templates: template.Must(template.ParseGlob("public/view/*.html")),}e.Renderer = te.GET("/", func(c echo.Context) error {return c.Render(http.StatusOK, "index", "Hello, World!")})e.GET("/hello", func(c echo.Context) error {return c.Render(http.StatusOK, "hello", "World")})e.Logger.Fatal(e.Start(":1325"))
}

Part8 Cookie与Session

import ("fmt""github.com/gorilla/sessions""github.com/labstack/echo""github.com/labstack/echo-contrib/session""github.com/labstack/echo/v4""net/http""time"
)func WriteCookie(c echo.Context) error {cookie := new(http.Cookie)cookie.Name = "userName"cookie.Value = "cookieValue"cookie.Expires = time.Now().Add(time.Hour * 2)c.SetCookie(cookie)return c.String(http.StatusOK, "write a cookie")
}func ReadCookie(c echo.Context) error {cookie, err := c.Cookie("userName")if err != nil {return err}fmt.Println(cookie.Name)fmt.Println(cookie.Value)return c.String(http.StatusOK, "read cookie")
}func ReadAllCookie(c echo.Context) error {for _, cookie := range c.Cookies() {fmt.Println(cookie.Name)fmt.Println(cookie.Value)}return c.String(http.StatusOK, "read all cookie")
}func SessionHandler(c echo.Context) error {sess, _ := session.Get("session", c)sess.Options = &sessions.Options{Path:     "/",MaxAge:   86400 * 7,HttpOnly: true,}sess.Values["foo"] = "bar"sess.Save(c.Request(), c.Response())return c.String(http.StatusOK, "session handler")
}
func main() {e := echo.New()e.GET("/", func(c echo.Context) error {return c.String(http.StatusOK, "<h1>Hello, World</h1>")})e.GET("/writeCookie", WriteCookie)e.GET("/readCookie", ReadCookie)e.GET("/readAllCookie", ReadAllCookie)store := sessions.NewCookieStore([]byte("secret"))// 使用会话中间件e.Use(session.Middleware(store))//e.Use(session.Middleware(sessions.NewCookieStore([]byte("secret"))))e.GET("/session", SessionHandler)e.Logger.Fatal(e.Start(":1325"))
}

Part9 JWT

import ("github.com/dgrijalva/jwt-go""github.com/labstack/echo""github.com/labstack/echo/middleware""net/http""strconv""time"
)type User struct {Username string `json:"username"`Password string `json:"password"`
}const jwtSecret = "secret"type JwtCustomClaims struct {Name string `json:"name"`ID   int    `json:"id"`jwt.StandardClaims
}func Login(c echo.Context) error {u := new(User)if err := c.Bind(u); err != nil {return c.JSON(http.StatusOK, echo.Map{"errcode": 401,"errmsg":  "request error",})}if "pass" == u.Password && u.Username == "name" {claims := &JwtCustomClaims{Name: u.Username,ID:   12,StandardClaims: jwt.StandardClaims{ExpiresAt: time.Now().Add(time.Hour * 24).Unix()},}token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)t, err := token.SignedString([]byte(jwtSecret))if err != nil {return err}return c.JSON(http.StatusOK, echo.Map{"token":   t,"errcode": 200,"errmsg":  "success",})} else {return c.JSON(http.StatusOK, echo.Map{"errcode": -1,"errmsg":  "failed",})}
}
func main() {e := echo.New()e.GET("/", func(c echo.Context) error {return c.String(http.StatusOK, "<h1>Hello, World</h1>")})e.POST("/login", Login)r := e.Group("/api")r.Use(middleware.JWTWithConfig(middleware.JWTConfig{Claims:     &JwtCustomClaims{},SigningKey: []byte(jwtSecret),}))r.Use(func(next echo.HandlerFunc) echo.HandlerFunc {return func(c echo.Context) error {user := c.Get("user").(*jwt.Token)claims := user.Claims.(*JwtCustomClaims)c.Set("name", claims.Name)c.Set("uid", claims.ID)return next(c)}})r.GET("/getInfo", func(c echo.Context) error {name := c.Get("name").(string)id := c.Get("id").(int)return c.String(http.StatusOK, "name:"+name+"id:"+strconv.Itoa(id))})e.Logger.Fatal(e.Start(":1323"))
}

Part9 日志

import ("github.com/labstack/echo""github.com/labstack/echo/middleware""github.com/labstack/gommon/log""net/http"
)func main() {e := echo.New()e.Use(middleware.Logger())e.GET("/", func(c echo.Context) error {e.Logger.Debugf("这是格式化输出%s")e.Logger.Debugj(log.JSON{"aaa": "cccc"})e.Logger.Debug("aaaa")return c.String(http.StatusOK, "<h1>Hello, World</h1>")})e.Logger.SetLevel(log.INFO)e.GET("/info", func(c echo.Context) error {e.Logger.Infof("这是格式化输出%s")e.Logger.Infoj(log.JSON{"aaa": "cccc"})e.Logger.Info("aaaa")return c.String(http.StatusOK, "INFO PAGE!")})e.Logger.Fatal(e.Start(":1323"))}

Part10 文件上传与下载

import ("github.com/labstack/echo""io""net/http""os"
)func upload(c echo.Context) error {file, err := c.FormFile("filename")if err != nil {return err}src, err := file.Open()if err != nil {return err}defer src.Close()dst, err := os.Create("upload/" + file.Filename)if err != nil {return err}defer dst.Close()if _, err = io.Copy(dst, src); err != nil {return err}return c.String(http.StatusOK, "upload success")
}
func multiUpload(c echo.Context) error {form, err := c.MultipartForm()if err != nil {return err}files := form.File["files"]for _, file := range files {src, err := file.Open()if err != nil {return err}defer src.Close()dst, err := os.Create("upload/" + file.Filename)if err != nil {return err}defer dst.Close()if _, err = io.Copy(dst, src); err != nil {return err}}return c.String(http.StatusOK, "upload success")}
func main() {e := echo.New()e.GET("/", func(c echo.Context) error {return c.Attachment("attachment.txt", "attachment.txt")})e.GET("/index", func(c echo.Context) error {return c.File("./multiUpload.html")})e.POST("/upload", upload)e.POST("/multiUpload", multiUpload)e.Logger.Fatal(e.Start(":1335"))
}

Part 11 Websocket通信

package mainimport ("fmt""github.com/gorilla/websocket""github.com/labstack/echo""github.com/labstack/echo/middleware"
)var upgrader = websocket.Upgrader{}func hello(c echo.Context) error {ws, err := upgrader.Upgrade(c.Response(), c.Request(), nil)if err != nil {return err}defer ws.Close()for {err := ws.WriteMessage(websocket.TextMessage, []byte("hello world"))if err != nil {c.Logger().Error(err)}_, msg, err := ws.ReadMessage()if err != nil {c.Logger().Error(err)}fmt.Printf("%s\n", msg)}
}
func main() {e := echo.New()e.Use(middleware.Logger())e.Use(middleware.Recover())e.Static("/", "./public")e.GET("/", func(c echo.Context) error {return c.File("./public/webtest.html")})e.GET("/ws", hello)e.Logger.Fatal(e.Start(":1330"))
}