gin里获取http请求过来的参数

https://www.bilibili.com/video/av68769981/?p=2

课程代码:
https://www.qfgolang.com/?special=ginkuangjia&pid=2783

https://www.liwenzhou.com/posts/Go/Gin_framework/

package main

import (
   "bytes"
   "encoding/json"
   "fmt"
   "log"
   "strconv"
   "github.com/gin-gonic/gin"
)

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



   // Query / DefaultQuery 单个接收get参数

   //http://localhost:8080/hello?name=haima
   engine.GET("/hello", func(context *gin.Context) {
      fmt.Println(context.FullPath())

      //获取字符串参数
      username := context.Query("name") //方法一
      fmt.Println(username)
      //name := context.DefaultQuery("name", "") //方法二
      //fmt.Println(name)

      context.Writer.Write([]byte("Hello," + username)) //Hello,go
   })

   type Student struct {
      Name    string `form:"name"`
      Classes string `form:"classes"`
   }


   // ShouldBindQuery 批量接收get参数

   // http://localhost:8080/hello2?name=davie&classes=软件工程
   engine.GET("/hello2", func(context *gin.Context) {
      fmt.Println(context.FullPath())
      var student Student
      err := context.ShouldBindQuery(&student)
      if err != nil {
         log.Fatal(err.Error())
      }

      fmt.Println(student.Name)    //davie
      fmt.Println(student.Classes) //软件工程
      context.Writer.Write([]byte("hello," + student.Name))

   })

   type Register struct {
      UserName string `form:"name"`
      Phone    string `form:"phone"`
      Password string `form:"pwd"`
   }

   //http://localhost:8080/login
   //单个接收post过来的参数
   engine.POST("/login", func(context *gin.Context) {

      fmt.Println(context.FullPath()) // /login
      username := context.PostForm("username") //方法一
      //username, exist := context.GetPostForm("username") //方法二
      userId, _ := strconv.ParseInt(context.Query("user_id"), 10, 64)

      //if !exist {
      // fmt.Println(username) //adf
      //}

      //password := context.PostForm("pwd")
      password, exists := context.GetPostForm("pwd") //12323
      //password:= com.StrTo(context.GetPostForm("pwd")).MustInt()

      if !exists {
         fmt.Println(password) //12323
      }
      fmt.Printf("%T %s\n", username,username)  //string adf
      fmt.Printf("%T %d\n", userId,userId) //int64 0
      fmt.Printf("%T %s\n", password,password) //string 12323
      context.Writer.Write([]byte("Hello  " + username + ", pwd:" + password)) //Hello  go, pwd:123
   })

   //http://localhost:8080/register
   // ShouldBind 批量接收post数据 from-data
   engine.POST("/register", func(context *gin.Context) {
      fmt.Println(context.FullPath())
      var register Register
      if err := context.ShouldBind(&register); err != nil {
         log.Fatal(err.Error())
         return
      }

      fmt.Println(register.UserName)
      fmt.Println(register.Phone)
      context.Writer.Write([]byte(register.UserName + " Register "))

   })


   // BindJSON 批量接收 post raw json 数据 方法一

   //http://localhost:8080/testpost
   //{
   // "user_id": 1,
   // "linkbook_id": "001",
   // "type":"education",
   // "id": 2
   //}
   engine.POST("/testpost", func(ctx *gin.Context) {
      fmt.Println(ctx.FullPath())

      type delInfo struct {
         UserID     int    `from:"user_id"`
         LinkbookID string `from:"linkbook_id"`
         Type       string `from:"type"`
         ID         int    `from:"id"`
      }
      var delInfoParam delInfo
      if err := ctx.BindJSON(&delInfoParam); err != nil {
         log.Fatal(err.Error())
         return
      }

      ctx.Writer.Write([]byte("Hello," + delInfoParam.Type)) //Hello,go
   })

   // BindJSON 批量接收 post raw json 数据 方法二

   //http://localhost:8080/test
   engine.POST("/test", func(context *gin.Context) {
      fullPath := "请求路径:" + context.FullPath()
      fmt.Println(fullPath)
      SetBodyJson(context, "json")
      var delInfo map[string]interface{}
      err := getRequestBody(context, &delInfo)
      fmt.Println(err)
      fmt.Println(delInfo)
   })


   //http://localhost:8080/user/22
   engine.DELETE("/user/:id", DeleteHandle)

   engine.Run(":8090")
}

//http://localhost:8080/user/adf
func DeleteHandle(context *gin.Context) {
   fmt.Println(context.FullPath()) //  /user/:id

   userID := context.Param("id")

   fmt.Println(userID) //adf

   context.Writer.Write([]byte("Delete user's id : " + userID)) //Delete user's id : adf
}


func getRequestBody(context *gin.Context, s interface{}) error {
   body, _ := context.Get("json")
   reqBody, _ := body.(string)
   decoder := json.NewDecoder(bytes.NewReader([]byte(reqBody)))
   decoder.UseNumber()
   err := decoder.Decode(&s)
   return err
}

// @desc 通过上下文获取body内容并将内容写到指定key中
func SetBodyJson(context *gin.Context, key string) {
   body := make([]byte, 1048576)
   n, _ := context.Request.Body.Read(body)
   fmt.Println("request body:", n)
   context.Set(key, string(body[0:n]))
}


//type People interface {
// name()
//}
//
//type Wang struct {
// Name string
//}
//
//func (p *Wang) name() {
// p.Name = "wang"
//}
//
//func (p *Wang) sayMyName() {
// fmt.Println(p.Name)
//}

context.Param获取请求参数

客户端的请求接口是DELETE类型，请求url为：http://localhost:9000/user/1。

最后的1是要删除的用户的id，是一个变量。因此在服务端gin中，

通过路由的:id来定义一个要删除用户的id变量值，

同时使用context.Param进行获取