1、安装

go get -u github.com/gin-gonic/gin

2、简单实现helloworld 实例

package main

import (
   "github.com/gin-gonic/gin"
   "net/http"
)

func main() {
   router := gin.Default()
   // 创建路由
   router.GET("/index", func(c *gin.Context) {
      c.String(http.StatusOK,"hello world")
   })

   //监听服务，默认:8080
   router.Run(":9090")
}

上面的例子中，我们注册了一个GET 方法访问 "/index" 的路由，在浏览器中访问http://localhost:9090/index

3、单元测试
基于assert 断言，判断http api 返回的状态码跟内容是否与预期一致

// main.go
package main

import (
   "github.com/gin-gonic/gin"
   "net/http"
)

func SetupRouter() *gin.Engine{
   router := gin.Default()
   router.GET("/ping", func(c *gin.Context) {
      c.String(http.StatusOK,"pong")
   })
   return router
}

func main() {
   r := SetupRouter()
   r.Run(":9090")
}

// index_test.go
package main

import (
   "gopkg.in/go-playground/assert.v1"
   "net/http"
   "net/http/httptest"
   "testing"
)

func TestIndexGetRouter(t *testing.T){
   router := SetupRouter()
   w := httptest.NewRecorder()
   req ,_ := http.NewRequest(http.MethodGet,"/ping",nil)
   router.ServeHTTP(w,req)

   assert.Equal(t,http.StatusOK,w.Code)
   assert.Equal(t,"pong",w.Body.String())
}

[GIN-debug] GET    /ping                     --> awesomeProject.SetupRouter.func1 (3 handlers)
[GIN] 2020/02/26 - 22:25:22 | 200 |            0s |                 | GET      /ping
--- PASS: TestIndexGetRouter (0.22s)
PASS

4、gin router
gin router 的三种启动方式
(1) router.Run()

(2) http.ListenAndServe()

func main() {
    router := gin.Default()
    http.ListenAndServe(":8080", router)
}

(3) 自定义http服务器

func main() {
    router := gin.Default()
    s := &http.Server{
        Addr: ":8080",
        Handler: router,
        ReadTimeout: 10 * time.Second,
        WriteTimeout: 10 * time.Second,
        MaxHeaderBytes: 1 << 20,
    }
    s.ListenAndServe()
}