[大数据]gin基础

?官网
https://gin-gonic.com/docs/

开源作者推荐：https://www.sohamkamani.com/

中文看云文档

获取传参

https://gin-gonic.com/zh-cn/docs/examples/querystring-param/

// get传参
func GetChuanCan( c *gin.Context)  {
	var name = c.Query("name")
	msg:="recive get args:"+name
	c.String(200,msg)
}

json返回

?
package main

import (
	"github.com/gin-gonic/gin"
	"net/http"
)
var m1 = map[string]interface{}{
	"name":"tom",
	"city":"cs",
	"sex":"男",
}

func main() {
	r:=gin.Default()
	r.GET("/ping", func(c *gin.Context) {
		c.JSON(200,m1)
	})
	r.Run()

}

?
···
##### Struct 转 JSON

```go
?
package main

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


// 结构体转json 
type student struct {
	Name string
	Sex string
}


func main() {
	r := gin.Default()
	r.GET("/hello", func(c *gin.Context) {
		c.JSON(200, student{Name: "tom",Sex: "man"})
	})
	r.Run(":8000")
}

?

自定义JSON字段名称

?
package main

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


// 结构体转json 
type student struct {
	Name string `json:"name"`
	Sex string `json:"sex"`
}


func main() {
	r := gin.Default()
	r.GET("/hello", func(c *gin.Context) {
		c.JSON(200, student{Name: "tom",Sex: "man"})
	})
	r.Run(":8000")
}

?

返回json列表

?
package main

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


// 结构体转json 
type student struct {
	Name string `json:"name"`
	Sex string `json:"sex"`
}


func main() {
	r := gin.Default()
	all_student := []student{{Name: "tom",Sex: "man"},{Name: "nick",Sex: "woman"}}
	r.GET("/hello", func(c *gin.Context) {
		//c.JSON(200,all_student)
		c.IndentedJSON(200, all_student)  // 格式化json
	})
	r.Run(":8000")
}

?

?模块化

?
package main

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

//http://localhost:9090/test/1/dong
func getUser(c *gin.Context) {
	id := c.Param("id")
	name := c.Param("name")
	json := gin.H{
		"data": id,
		"name": name,
	}
	c.JSON(http.StatusOK, json)
}

//http://localhost:9090/sayHello/dong
func SayHello(c *gin.Context) {
	name := c.Param("name")
	c.String(http.StatusOK, "hello,"+name)
}


func main() {
	r := gin.Default()
	r.GET("/sayHello/:name", SayHello)
	r.GET("/test/:id/:name", getUser)
	r.Run(":9090")
}

?