綁定查詢字串或 POST 資料

ShouldBind 會根據 HTTP 方法和 Content-Type 標頭自動選擇綁定引擎：

對於 GET 請求，使用查詢字串綁定（form 標籤）。
對於 POST/PUT 請求，會檢查 Content-Type——對 application/json 使用 JSON 綁定，對 application/xml 使用 XML 綁定，對 application/x-www-form-urlencoded 或 multipart/form-data 使用表單綁定。

這意味著單一處理器可以接受來自查詢字串和請求主體的資料，而無需手動選擇來源。

package main

import (
  "log"
  "net/http"
  "time"

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

type Person struct {
  Name     string    `form:"name"`
  Address  string    `form:"address"`
  Birthday time.Time `form:"birthday" time_format:"2006-01-02" time_utc:"1"`
}

func main() {
  route := gin.Default()
  route.GET("/testing", startPage)
  route.POST("/testing", startPage)
  route.Run(":8085")
}

func startPage(c *gin.Context) {
  var person Person
  if err := c.ShouldBind(&person); err != nil {
    c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
    return
  }

  log.Printf("Name: %s, Address: %s, Birthday: %s\n", person.Name, person.Address, person.Birthday)
  c.JSON(http.StatusOK, gin.H{
    "name":     person.Name,
    "address":  person.Address,
    "birthday": person.Birthday,
  })
}

測試

# GET with query string parameters
curl "http://localhost:8085/testing?name=appleboy&address=xyz&birthday=1992-03-15"
# Output: {"address":"xyz","birthday":"1992-03-15T00:00:00Z","name":"appleboy"}

# POST with form data
curl -X POST http://localhost:8085/testing \
  -d "name=appleboy&address=xyz&birthday=1992-03-15"
# Output: {"address":"xyz","birthday":"1992-03-15T00:00:00Z","name":"appleboy"}

# POST with JSON body
curl -X POST http://localhost:8085/testing \
  -H "Content-Type: application/json" \
  -d '{"name":"appleboy","address":"xyz","birthday":"1992-03-15"}'
# Output: {"address":"xyz","birthday":"1992-03-15T00:00:00Z","name":"appleboy"}

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