go学习-获取form表单提交数据

当前端请求的数据通过form表单提交时，例如向/user/search发送一个POST请求，获取请求数据的方式如下：
main.go

package main

import (
	"net/http"

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

func main() {
	r := gin.Default()
	r.LoadHTMLFiles("./login.html", "./index.html")
	r.GET("/login", func(c *gin.Context) {
		c.HTML(http.StatusOK, "login.html", nil)
	})

	r.POST("/login", func(c *gin.Context) {
		//方法1 用PostForm获取form表达
		// username := c.PostForm("username")
		// password := c.PostForm("password")
		//方法2 用DefaultPostForm获取form表达，有个默认值
		// username := c.DefaultPostForm("username", "默认名字")
		// password := c.DefaultPostForm("password", "默认密码")
		//方法3 GetPostForm 多了一个是否存在的返回值
		username, ok := c.GetPostForm("username")
		if !ok {
			username = "默认用户名"
		}
		password, ok := c.GetPostForm("password")
		if !ok {
			password = "默认密码"
		}
		c.HTML(http.StatusOK, "index.html", gin.H{
			"name":     username,
			"Password": password,
		})
	})
	r.Run(":9090")
}

<!DOCTYPE html>
<html lang="zh-CN">
<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>index</title>
</head>
<body>
    <p>你的名字是：{{ .name }}</p>
</body>
</html>

index.html

<!DOCTYPE html>
<html lang="zh-CN">
<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>index</title>
</head>
<body>
    <p>你的名字是：{{ .name }}</p>
</body>
</html>