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gin架構26--綁定表單資料至自定義結構體介紹案例說明

gin架構26--綁定表單資料至自定義結構體

  • 介紹
  • 案例
  • 說明

介紹

本文介紹 如何綁定表單資料至自定義結構體,并加以案例說明。

案例

源碼:

package main

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

type StructA struct {
	FieldA string `form:"field_a"`
}

type StructB struct {
	NestedStruct StructA
	FieldB       string `form:"field_b"`
}

type StructC struct {
	NestedStructPointer *StructA
	FieldC              string `form:"field_c"`
}

type StructD struct {
	NestedAnonyStruct struct {
		FieldX string `form:"field_x"`
	}
	FieldD string `form:"field_d"`
}

func GetDataB(c *gin.Context) {
	var b StructB
	c.Bind(&b)
	c.JSON(200, gin.H{
		"a": b.NestedStruct,
		"b": b.FieldB,
	})
}

func GetDataC(c *gin.Context) {
	var b StructC
	c.Bind(&b)
	c.JSON(200, gin.H{
		"a": b.NestedStructPointer,
		"c": b.FieldC,
	})
}

func GetDataD(c *gin.Context) {
	var b StructD
	c.Bind(&b)
	c.JSON(200, gin.H{
		"x": b.NestedAnonyStruct,
		"d": b.FieldD,
	})
}

func main() {
	r := gin.Default()
	r.GET("/getb", GetDataB)
	r.GET("/getc", GetDataC)
	r.GET("/getd", GetDataD)

	r.Run()
}
           

測試:

http://127.0.0.1:8080/getb?field_a=hello&field_b=world
{
    "a": {
        "FieldA": "hello"
    },
    "b": "world"
}

http://127.0.0.1:8080/getc?field_a=hello&field_c=world
{
    "a": {
        "FieldA": "hello"
    },
    "c": "world"
}

http://127.0.0.1:8080/getd?field_x=hello&field_d=world
{
    "d": "world",
    "x": {
        "FieldX": "hello"
    }
}
           

注意:目前僅支援沒有 form 的嵌套結構體, 不支援以下格式結構體:

type StructX struct {
    X struct {} `form:"name_x"` // 有 form
}

type StructY struct {
    Y StructX `form:"name_y"` // 有 form
}

type StructZ struct {
    Z *StructZ `form:"name_z"` // 有 form
}
           

說明

gin官方文檔 綁定表單資料至自定義結構體