1. 表单参数

• 表单传输为post请求，http常见的传输格式为四种：
  • application/json
  • application/x-www-form-urlencoded
  • application/xml
  • multipart/form-data
• 表单参数可以通过PostForm()方法获取，该方法默认解析的是x-www-form-urlencoded或from-data格式的参数

import (
    "fmt"
    "net/http"
)
func main() {
    r.POST("/form", func(c *gin.Context) {
        types := c.DefaultPostForm("type", "post")
        password := c.PostForm("userpassword")
        // c.String(http.StatusOK, fmt.Sprintf("username:%s,password:%s,type:%s", username, password, types))
        c.String(http.StatusOK, fmt.Sprintf("username:%s,password:%s,type:%s", username, password, types))
    })
    r.Run()