go gin

一、

1.安装

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

2.例子

package main

import "github.com/gin-gonic/gin"
func main() {
    r := gin.Default()
    r.GET("/ping", func(c *gin.Context) {
        c.JSON(200, gin.H{
            "message": "pong",
        })
    })
    r.Run()
}

3.测试

http://127.0.0.1:8080/ping

4.结合 vue和Bootstrap

main.go

package main

import (
    "net/http"

    "github.com/gin-gonic/gin"
)

func main() {
    r := gin.Default()
    r.LoadHTMLGlob("view/*")
    r.GET("/", func(c *gin.Context) {
        c.HTML(http.StatusOK, "index.html", gin.H{})
    })
    r.Run()
}

<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" >
  </head>
  <body>
    <div id="vm"  class="container">
        <div class="d-flex justify-content-center p-5">
            <input v-model="message"/>
        </div>
        <div class="d-flex justify-content-center">
            <h1>${message}</h1>
        </div>
    </div>

    <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" ></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" ></script>
    <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" ></script>
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>  
    <script>
        var vm = new Vue({
            // 由于双花括号和go模板冲突，把vue双花改成${message}形式
            delimiters: ['${', '}'],
            el: '#vm',
            data: {
                message: null
            }
        })
    </script>
</body>
</html>

二、

1.请求方式及请求路径

func main() {
    //使用默认中间件创建一个gin路由器
    r := gin.Default()
    //get请求方式：参数1地址，参数2函数
    r.GET("/", getting)
    //启动默认端口8080
    r.Run()
}

func getting(c *gin.Context) {
    //
    c.JSON(200, "Hello")
}

2.参数

（1）路径传参

127.0.0.1:8080/tom

func main() {
    r := gin.Default()
    //get请求方式：参数1地址，参数2函数
    r.GET("/:name", getting)
    r.Run()
}

func getting(c *gin.Context) {
    //
    name := c.Param("name")
    c.String(200, "Hello %s", name)
}

（2）get

func main() {
    r := gin.Default()
    r.GET("/", getting)
    r.Run()
}

func getting(c *gin.Context) {
    //设置默认值，如果客户端为传递str1，则默认赋值为def
    str1 := c.DefaultQuery("str1", "def")
    str2 := c.Query("str2") // 是 c.Request.URL.Query().Get("str2") 的简写
    c.String(200, "Hello %s
", str1)
    c.String(200, "Hello %s", str2)
}

(3)表单

func main() {
    r := gin.Default()
    r.POST("/", posting)
    r.Run()
}

func posting(c *gin.Context) {

    name := c.PostForm("name")
    c.String(200, "Hello %s 
", name)

    age := c.DefaultPostForm("age", "18") // 此方法可以设置默认值
    c.String(200, "Hello %s", age)
}