1.    //返回json
    r.GET("/getJson", controller.GetUserInfo)

package main

import (
	/*"net/http"*/
	"gin/src/main/controller"
	"github.com/gin-gonic/gin"
)


func main()  {
	r := gin.Default()

	r.GET("/get", func(ctx *gin.Context) {
		ctx.String(200/*http.StatusOK*/, "hello word golang-web!")
	})

	r.POST("/user/post", func(ctx *gin.Context) {
		ctx.String(200, "这是一个post请求！")
	})

	r.PUT("/user/put", func(ctx *gin.Context) {
		ctx.String(200, "这是一个put请求！")
	})

	r.DELETE("/user/delete", func(ctx *gin.Context) {
		ctx.String(200, "这是一个delete请求！")
	})


	//返回json
	r.GET("/getJson", controller.GetUserInfo)




	r.Run(":9999")
}

2.

package controller

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

func GetUserInfo(c *gin.Context)  {
	ReturnSucess(c, 200, "sucess", "user info" , 1)

}

3.

package controller


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


type JsonStruct struct {
	 Code  int           //'json: "code"'
	 Msg   interface{}   //'json: "msg"'
	 Data  interface{}   //'json: "data"'
	 Count int64         //'json: "count"'
}

func ReturnSucess(c *gin.Context, code int , msg interface{}, data interface{}, count int64)  {
	json := &JsonStruct{Code: code, Msg: msg, Data: data, Count: count}
	c.JSON(200, json)
}

func ReturnError(c *gin.Context, code int , msg interface{}, data interface{}, count int64)  {
	json := &JsonStruct{Code: code, Msg:msg, Data:data, Count:count}
	c.JSON(200, json)
}

4.接口返回示例：