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

package mainimport (/*"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jsonr.GET("/getJson", controller.GetUserInfo)r.Run(":9999")
}

2.

package controllerimport "github.com/gin-gonic/gin"func GetUserInfo(c *gin.Context)  {ReturnSucess(c, 200, "sucess", "user info" , 1)}

3.

package controllerimport "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：