获取Post中参数

package main

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

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

	router.POST("/form_post", func(c *gin.Context) {
		message := c.PostForm("username")
		nick := c.DefaultPostForm("userpassword", "？？？？") // 此方法可以设置默认值

		// gin.H 实际上就是 map[string]interface{}
		c.JSON(200, gin.H{
			"status":  "posted",
			"username": message,
			"userpassword":    nick,
		})
	})
	router.Run(":8080")
}

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
<form action="http://localhost:8080/form_post" method="post" action="application/x-www-form-urlencoded">
    用户名：<input type="text" name="username" placeholder="请输入你的用户名">  <br>
    密   码：<input type="password" name="userpassword" placeholder="请输入你的密码">  <br>
    <input type="submit" value="提交">
</form>
</body>
</html>